CA1307942C - Optical radiation sensor apparatus - Google Patents
Optical radiation sensor apparatusInfo
- Publication number
- CA1307942C CA1307942C CA000553318A CA553318A CA1307942C CA 1307942 C CA1307942 C CA 1307942C CA 000553318 A CA000553318 A CA 000553318A CA 553318 A CA553318 A CA 553318A CA 1307942 C CA1307942 C CA 1307942C
- Authority
- CA
- Canada
- Prior art keywords
- casing
- detector
- processing unit
- connector device
- optical radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 39
- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 238000012545 processing Methods 0.000 claims abstract description 35
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 4
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 230000013011 mating Effects 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 3
- 239000000110 cooling liquid Substances 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0818—Waveguides
- G01J5/0821—Optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature
- G01J2005/607—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature on two separate detectors
Abstract
ABSTRACT OF THE DISCLOSURE
Optical pyrometers such as for a gas-turbine engine have a fibre-optic cable that supplies radiation from the engine blades to a remotely mounted detector. The output from the detector is amplified and processed to provide an indication of temperature.
In the present invention the detector includes a photodiode and an amplifier that are mounted in a cylindrical metal casing that forms one end of the fibre-optic cable. The detector casing has a connector that is mateable with a connector on the casing of a separate processing unit so that the detector can be electrically connected with the processing unit without the need for cables between the two casings.
The detector connector has a flange that provides good thermal contact with the connector on the processing unit so as to help equalise the temperatures of the two casings. The processing unit casing is cooled by means of a thermal transfer unit supplied with liquid fuel. The processing unit has an electrical circuit that processes the output of the detector circuit and inputs from other sources to provide an output to an engine control unit.
Optical pyrometers such as for a gas-turbine engine have a fibre-optic cable that supplies radiation from the engine blades to a remotely mounted detector. The output from the detector is amplified and processed to provide an indication of temperature.
In the present invention the detector includes a photodiode and an amplifier that are mounted in a cylindrical metal casing that forms one end of the fibre-optic cable. The detector casing has a connector that is mateable with a connector on the casing of a separate processing unit so that the detector can be electrically connected with the processing unit without the need for cables between the two casings.
The detector connector has a flange that provides good thermal contact with the connector on the processing unit so as to help equalise the temperatures of the two casings. The processing unit casing is cooled by means of a thermal transfer unit supplied with liquid fuel. The processing unit has an electrical circuit that processes the output of the detector circuit and inputs from other sources to provide an output to an engine control unit.
Description
~ ~3~342 OPTIC~L RADIATIO~ SE~SOR ~PP~B~TUS t Back~round of the Invention This invention relates to optical radiation sensor apparatus.
The invention is more especially, but not exclusively, ~oncerned with optical pyrometer apparatus.
Optical pyrometer apparatus are used for measuring high temperatures in for example, gas-turbine engines and furnaces. The pyrometer apparatus includes a radiation receiving head, a radiation detector which produces an electrical output, a preamplifer for amplifying the detector output, and utilising apparatus for scaling, comparison and calculation on the preamplified output of the detector to provide an output suitable for display of temperature, data storage, performance o~ a control function and so on.
The radiation dete~tor may be contained in the receiving head 80 that an electrical output is produced, but there are advantagQs to mounting the detector remotely snd interconnecting the detector and receiving head by a flexible radiation guide, such as a fibre-optic cable. In this way9 the detector can be mounted at a cooler location. Such fibre-optic pyrometers9 therefore comprise three separate units: the pyrometer head; the detector and preamplifier or other signal conditioning unit; and the ~tilising apparatusO
The pyrometer head is connected to the detector by a fibre-optic cable: the detector i9 connected to the utilisation apparatus by an electrical cable.
Other similar optical radiation sensor apparatus are also divided into three units interconnected by cables.
~3~79~;2 Such apparatus has several disadvantages. The electrical cable and connectors between the detector and utilisation apparatus adds to the overall weight of the pyrometer, especially where the cable is screened which is usually necessary in aircraft applications. The cable and connectors can also be susceptible to electromagnetic interference. The detector must also be clamped, screwed or otherwised secured in place, making installation more difficult.
Brief Summary of the Invention It is an object of the present invention to provide optical radiation sensor apparatus with advantages over previous apparatusO
According to one aspect of the present invention there is provided optical radiation sensor apparatus comprising an optical radiation receiving head arranged to receive radiation; optical radiation guide means having one end coupled with the receiving head, said guide means being arranged to transmit radiation from the receiving head; optical detector assembly including a first rigid casing enclosing an optical radiation detector device and electrical signal conditioning means having an input connected with the detector device and an output connected with a first mateable connector device on said casing; and a processing unit including a second rigid cas;ng containing electrical circuit means having an input connected with a second mateable connector device on the second casing, said cir6uit means being arranged to process the output of the detector assembly, said second connector device being adapted to mate and engage directly with the first connector device such that the optical detector assembly can be connected with the ~L3~79~2 processing unit without the interposition of any cable between the respective casings.
The detector assembly is preferably retained on the processing unit substantially solely by mating of the first and second connector devices. The first rigid casing may be of substantially cylindrical shape. The first mateable connector device may be secured wîth the first casing by means of cooperating screw threads on the connector device and casing. The electrical signal conditioning means preferably includes amplifier means arranged to amplify the output of the detector device. The guide means may include an optical fibre cable. The receiving head may include converging lens means arranged to focus radiation onto an end of the optical fibre cable and the detector device may include a photodiode.
The first and second connector devices are preferably arranged to be in good therm&l contact with one another when mated such as to promote equalisation of the temperatures of the first and second casings. The first connector device may be provided with an annular flange that is arranged to contact a surface on the second connector device so as to provide good thermal contact between the two connector devices. Thermal transfer means may be associated with the second casing and the thermal transfer means may be supplied with a cooling fluid such as liquid fuel. The optical radiation detector device may be thermally insulated from the first casing. The processing unit may be arranged to receive input signals-from other sources.
The apparatus may be a pyrometer and the output of the processing unit may be supplied to an engine control unit.
. ~
~3~7~4;2 Pyrometer apparatus for a gas-turbine engine in accordance with the present invention will now be described, by way of example, with reference to the accompanying drawings.
Brief-Descri~tion of the Dra~in.s Figure 1 illustrates the pyrometer apparatus installed on a gas-turbine engine;
Figure 2 is a sectional view of a part of the apparatus; and Figure 3 shows the electronic components of the apparatus schematically.
' ~L 3~ 7 ~ d9 Detailed Description With reference first to Figure 1, the pyrometer apparatus comprises a pyrometer head 1, mounted to view the blades 2 of a gas-turbine engine, a detector 3 connected with the pyrometer head by means of a cable 4, and a processing unit 5 which receives the detector output and provides a signal related to temperature and other parameters to an engine control unit 6.
:
The pyrometer head 1 is of conventional construction, such as described in GB 2158576A or GB 1589531, having a heat-resistant converging lens 10 mounted towards the rear of a sighting tube 11. The lens 10 focuses radiation 10 emitted by the blades 2, which enters the sighting tube 11, onto the forward end 40 of the cable 4. The cable 4 is a fibre-optic cable, or some similar optical radiation guide, and is fle~cible or bendable so that there is freedom in the mounting of the pyrometer head 1 and detector 3. The cable 4 may be armoured for protection and is long enough to enable the detector 3, at the 15 rear end 41 of the cable, to be located at a cooler region.
With referance now to Figure 2, the detector has a cylindrial casing 30 formed by a forward part 31 and rear connector or plug assembly 32. The forward part 31 comprises an inner sleeve 33 welded to the rear end of the cable termination 41, and an outer sleeve 34, the forward end of which engages 20 a shoulder 35 on the inner sleeve and the rear end of which is joined to the plug assembly 32. The overall length of the detector 3 is 60mm and it has a diameter of 20mm. Within the forward part 31 of the detector 3 there are mounted one or more photodiodes 36 which receive radiation emitted from the rear end termination 41 of the cable 4. The photodiode 36 is supported in 25 the inner sleve 33 by a heat insulating support ring 42. A self-regulating heating element (not shown) may be mounted close to the photodiode to enable its temperaturP to be raised when necessary.
~L3(~7~
.
The electrical output of the photodiode 36 is supplied to an electrical circuit assembly 37 within ehe casing 30 which is shown in greater de~ail in Figure 3.
The circuit assembly 37 includes an amplifier 38 which produces a S voltage output proportional to the current output of the photodiode 36. This voltage is amplified at a gain stage 39. A circuit 50 may be included for removing signals produced by extraneous fl~mes within the engine. In general, the circuit assembly 37 produces electrical signal conditioning of the output of the photodiode 36 into a form suitable for handling by the processing unit 5. The signals at the output of the circuit assembly 37 are supplied via lines 51 to the plug assembly 32 formed at the rear end of the detector casing 30. The plug assembly 32 is a multi-pin plug-in mateable connector and includes pins by which electrical power is supplied to the circuit assembly 37. The plug assembly 32 has a radially extending flange 43 that is embraced by an outer, threaded locking ring 44.
The plug assembly 32 on the detector 3 is arranged to mate directly with a cooperating connector 52 on the casing 53 of the processing unit 5. The connector 52 has a flat surface (not shown) against which the flange 43 on the connector 32 is abutted in good thermal contact~ The processing unit 5 contains electronic processing circuits, indicated generally by the numeral 54. These circuits are connected to the connector 52 so as to receive the signal conditioned output of the photodiode 36 in the detector 3. The processing unit also receives inputs on lines 56 from various other sensors and control devices indicative of, for example, speed, temperature and pressure, and provides an output to the engine control unit 6. The processing unit 5 includes a thermal transfer unit 60 mounted on its casing 53 which is ~ ' `.
~3~79~;~
.
supplied with a fluid, such as liquid fuel, to effect heat transfer, and, more particularly, cooling of the processing unit 5.
One typical method of measuring temperature~involves comparing the radiation levels at two different wavelengths. In such an arrangement, the detector would include two photodiodes responsive to the respective two wavelengths. The two outputs produced may either be compared by circuitry in the detector 3 itself, or in the processing unit 5.
, The output of the processing unit 5 is supplied by a cable 57 to the engine control unit 6 which provides control of various engine functions. The output of the processing unit 5 may additionally, or alternatively, be supplied to some other form of utilisation means 6' such as, for example, a data recorder or a display.
The arrangement of the present invention, by having a connector 32 on the casing of the detector 3 that is directly mateable with a connector 52 on the casing 53 of the processing unit 5, without the interposition of any cable between the two casings, leads to a very compact arrangement and is less susceptible to electrical noise and other electromagnetic interference. By avoiding the need for a cable between the casings of the detector and processing unit, the overall weight of the apparatus can be kept to a minimum.
The detector is directly mounted on the processing unit thereby facilitating installation and maintenance. In this respect, the mating connectors on the detector and processing unit may be loc~ing connectors which are sufficient in themselves to support the detector 3.
~36~9~2 Because the mating connectors 32 and 52 are in good thermal contact, via the flange 43, any external heating of the detector 3 can be dissipated efficiently via the casing 53 o the processing unit 5 and the thermal transfer unit 60. This reduces the risk of overheating the photodiode 36 which is further reduced by the heat insulating ring 42. Where the apparatus is used in an environment that is below the optimum temperature of the photodiode 36,the thermal transfer unit 60 can be used to raise the temperature of the detector 3, and the heating element (not s~own) used to raise the temperature of the photodiode 36 directly.
In severe temperature environments, the temperature of the detector 3 can be maintaned more stable by means of a protective shroud around the detector, separated from the outer sleeve 34 by an air gap. This is especially effective where the detecto~ is located in a stream of flowing gas at e~treme temperature.
The invention is more especially, but not exclusively, ~oncerned with optical pyrometer apparatus.
Optical pyrometer apparatus are used for measuring high temperatures in for example, gas-turbine engines and furnaces. The pyrometer apparatus includes a radiation receiving head, a radiation detector which produces an electrical output, a preamplifer for amplifying the detector output, and utilising apparatus for scaling, comparison and calculation on the preamplified output of the detector to provide an output suitable for display of temperature, data storage, performance o~ a control function and so on.
The radiation dete~tor may be contained in the receiving head 80 that an electrical output is produced, but there are advantagQs to mounting the detector remotely snd interconnecting the detector and receiving head by a flexible radiation guide, such as a fibre-optic cable. In this way9 the detector can be mounted at a cooler location. Such fibre-optic pyrometers9 therefore comprise three separate units: the pyrometer head; the detector and preamplifier or other signal conditioning unit; and the ~tilising apparatusO
The pyrometer head is connected to the detector by a fibre-optic cable: the detector i9 connected to the utilisation apparatus by an electrical cable.
Other similar optical radiation sensor apparatus are also divided into three units interconnected by cables.
~3~79~;2 Such apparatus has several disadvantages. The electrical cable and connectors between the detector and utilisation apparatus adds to the overall weight of the pyrometer, especially where the cable is screened which is usually necessary in aircraft applications. The cable and connectors can also be susceptible to electromagnetic interference. The detector must also be clamped, screwed or otherwised secured in place, making installation more difficult.
Brief Summary of the Invention It is an object of the present invention to provide optical radiation sensor apparatus with advantages over previous apparatusO
According to one aspect of the present invention there is provided optical radiation sensor apparatus comprising an optical radiation receiving head arranged to receive radiation; optical radiation guide means having one end coupled with the receiving head, said guide means being arranged to transmit radiation from the receiving head; optical detector assembly including a first rigid casing enclosing an optical radiation detector device and electrical signal conditioning means having an input connected with the detector device and an output connected with a first mateable connector device on said casing; and a processing unit including a second rigid cas;ng containing electrical circuit means having an input connected with a second mateable connector device on the second casing, said cir6uit means being arranged to process the output of the detector assembly, said second connector device being adapted to mate and engage directly with the first connector device such that the optical detector assembly can be connected with the ~L3~79~2 processing unit without the interposition of any cable between the respective casings.
The detector assembly is preferably retained on the processing unit substantially solely by mating of the first and second connector devices. The first rigid casing may be of substantially cylindrical shape. The first mateable connector device may be secured wîth the first casing by means of cooperating screw threads on the connector device and casing. The electrical signal conditioning means preferably includes amplifier means arranged to amplify the output of the detector device. The guide means may include an optical fibre cable. The receiving head may include converging lens means arranged to focus radiation onto an end of the optical fibre cable and the detector device may include a photodiode.
The first and second connector devices are preferably arranged to be in good therm&l contact with one another when mated such as to promote equalisation of the temperatures of the first and second casings. The first connector device may be provided with an annular flange that is arranged to contact a surface on the second connector device so as to provide good thermal contact between the two connector devices. Thermal transfer means may be associated with the second casing and the thermal transfer means may be supplied with a cooling fluid such as liquid fuel. The optical radiation detector device may be thermally insulated from the first casing. The processing unit may be arranged to receive input signals-from other sources.
The apparatus may be a pyrometer and the output of the processing unit may be supplied to an engine control unit.
. ~
~3~7~4;2 Pyrometer apparatus for a gas-turbine engine in accordance with the present invention will now be described, by way of example, with reference to the accompanying drawings.
Brief-Descri~tion of the Dra~in.s Figure 1 illustrates the pyrometer apparatus installed on a gas-turbine engine;
Figure 2 is a sectional view of a part of the apparatus; and Figure 3 shows the electronic components of the apparatus schematically.
' ~L 3~ 7 ~ d9 Detailed Description With reference first to Figure 1, the pyrometer apparatus comprises a pyrometer head 1, mounted to view the blades 2 of a gas-turbine engine, a detector 3 connected with the pyrometer head by means of a cable 4, and a processing unit 5 which receives the detector output and provides a signal related to temperature and other parameters to an engine control unit 6.
:
The pyrometer head 1 is of conventional construction, such as described in GB 2158576A or GB 1589531, having a heat-resistant converging lens 10 mounted towards the rear of a sighting tube 11. The lens 10 focuses radiation 10 emitted by the blades 2, which enters the sighting tube 11, onto the forward end 40 of the cable 4. The cable 4 is a fibre-optic cable, or some similar optical radiation guide, and is fle~cible or bendable so that there is freedom in the mounting of the pyrometer head 1 and detector 3. The cable 4 may be armoured for protection and is long enough to enable the detector 3, at the 15 rear end 41 of the cable, to be located at a cooler region.
With referance now to Figure 2, the detector has a cylindrial casing 30 formed by a forward part 31 and rear connector or plug assembly 32. The forward part 31 comprises an inner sleeve 33 welded to the rear end of the cable termination 41, and an outer sleeve 34, the forward end of which engages 20 a shoulder 35 on the inner sleeve and the rear end of which is joined to the plug assembly 32. The overall length of the detector 3 is 60mm and it has a diameter of 20mm. Within the forward part 31 of the detector 3 there are mounted one or more photodiodes 36 which receive radiation emitted from the rear end termination 41 of the cable 4. The photodiode 36 is supported in 25 the inner sleve 33 by a heat insulating support ring 42. A self-regulating heating element (not shown) may be mounted close to the photodiode to enable its temperaturP to be raised when necessary.
~L3(~7~
.
The electrical output of the photodiode 36 is supplied to an electrical circuit assembly 37 within ehe casing 30 which is shown in greater de~ail in Figure 3.
The circuit assembly 37 includes an amplifier 38 which produces a S voltage output proportional to the current output of the photodiode 36. This voltage is amplified at a gain stage 39. A circuit 50 may be included for removing signals produced by extraneous fl~mes within the engine. In general, the circuit assembly 37 produces electrical signal conditioning of the output of the photodiode 36 into a form suitable for handling by the processing unit 5. The signals at the output of the circuit assembly 37 are supplied via lines 51 to the plug assembly 32 formed at the rear end of the detector casing 30. The plug assembly 32 is a multi-pin plug-in mateable connector and includes pins by which electrical power is supplied to the circuit assembly 37. The plug assembly 32 has a radially extending flange 43 that is embraced by an outer, threaded locking ring 44.
The plug assembly 32 on the detector 3 is arranged to mate directly with a cooperating connector 52 on the casing 53 of the processing unit 5. The connector 52 has a flat surface (not shown) against which the flange 43 on the connector 32 is abutted in good thermal contact~ The processing unit 5 contains electronic processing circuits, indicated generally by the numeral 54. These circuits are connected to the connector 52 so as to receive the signal conditioned output of the photodiode 36 in the detector 3. The processing unit also receives inputs on lines 56 from various other sensors and control devices indicative of, for example, speed, temperature and pressure, and provides an output to the engine control unit 6. The processing unit 5 includes a thermal transfer unit 60 mounted on its casing 53 which is ~ ' `.
~3~79~;~
.
supplied with a fluid, such as liquid fuel, to effect heat transfer, and, more particularly, cooling of the processing unit 5.
One typical method of measuring temperature~involves comparing the radiation levels at two different wavelengths. In such an arrangement, the detector would include two photodiodes responsive to the respective two wavelengths. The two outputs produced may either be compared by circuitry in the detector 3 itself, or in the processing unit 5.
, The output of the processing unit 5 is supplied by a cable 57 to the engine control unit 6 which provides control of various engine functions. The output of the processing unit 5 may additionally, or alternatively, be supplied to some other form of utilisation means 6' such as, for example, a data recorder or a display.
The arrangement of the present invention, by having a connector 32 on the casing of the detector 3 that is directly mateable with a connector 52 on the casing 53 of the processing unit 5, without the interposition of any cable between the two casings, leads to a very compact arrangement and is less susceptible to electrical noise and other electromagnetic interference. By avoiding the need for a cable between the casings of the detector and processing unit, the overall weight of the apparatus can be kept to a minimum.
The detector is directly mounted on the processing unit thereby facilitating installation and maintenance. In this respect, the mating connectors on the detector and processing unit may be loc~ing connectors which are sufficient in themselves to support the detector 3.
~36~9~2 Because the mating connectors 32 and 52 are in good thermal contact, via the flange 43, any external heating of the detector 3 can be dissipated efficiently via the casing 53 o the processing unit 5 and the thermal transfer unit 60. This reduces the risk of overheating the photodiode 36 which is further reduced by the heat insulating ring 42. Where the apparatus is used in an environment that is below the optimum temperature of the photodiode 36,the thermal transfer unit 60 can be used to raise the temperature of the detector 3, and the heating element (not s~own) used to raise the temperature of the photodiode 36 directly.
In severe temperature environments, the temperature of the detector 3 can be maintaned more stable by means of a protective shroud around the detector, separated from the outer sleeve 34 by an air gap. This is especially effective where the detecto~ is located in a stream of flowing gas at e~treme temperature.
Claims (10)
1. Optical radiation sensor apparatus comprising: an optical radiation receiving head; optical radiation guide means, said guide means having one end coupled with said receiving head such that said guide means transmits radiation received by said receiving head;
optical detector assembly, said optical detector assembly including a first rigid casing, a first mateable connector device on said casing, an optical radiation detector device and electrical signal conditioning means within said casing, said electrical signal conditioning means having an input connected with said detector device and an output connected with said first connector device; and a processing unit, said processing unit including a second rigid casing, a second connector device on said second casing, electrical circuit means within said second casing, said circuit means having an input connected with said second connector device, said circuit means being arranged to process the output of the detector assembly and said second connector device being adapted to mate and engage directly with the first connector device such that the optical detector assembly can be connected with the processing unit without the interposition of any cable between the respective casings.
optical detector assembly, said optical detector assembly including a first rigid casing, a first mateable connector device on said casing, an optical radiation detector device and electrical signal conditioning means within said casing, said electrical signal conditioning means having an input connected with said detector device and an output connected with said first connector device; and a processing unit, said processing unit including a second rigid casing, a second connector device on said second casing, electrical circuit means within said second casing, said circuit means having an input connected with said second connector device, said circuit means being arranged to process the output of the detector assembly and said second connector device being adapted to mate and engage directly with the first connector device such that the optical detector assembly can be connected with the processing unit without the interposition of any cable between the respective casings.
2. Optical radiation sensor apparatus according to claim 11 wherein said detector assembly is retained on said processing unit substantially solely by mating of the first and second connector devices.
3. Optical radiation sensor apparatus according to Claim 1, wherein the said first rigid casing is of substantially cylindrical shape.
4. Optical radiation sensor apparatus according to Claim 1, wherein the electrical signal conditioning means includes an amplifier that amplifies the output of the said radiation detector.
5. Optical radiation sensor apparatus according to Claim 1, wherein the optical radiation guide includes a fibre-optic cable.
6. Optical radiation sensor apparatus according to Claim 1, wherein the said first connector device is shaped to provided good thermal contact with the second connector device when mated so as thereby to promote equalisation of the temperatures of the two casings.
7. Optical radiation sensor apparatus according to Claim 6, wherein the said first connector device of the detector assembly includes an annular flange that contacts the second connector device of the processing unit so as to provide good thermal contact between the two connectors.
8. Optical radiation sensor apparatus according to Claim 6, wherein the apparatus includes a thermal transfer-unit mounted on the casing of the processing unit.
9. Optical radiation sensor apparatus according to Claim 8, wherein the thermal transfer unit includes means for supplying a cooling liquid to the thermal transfer unit.
10. Optical pyrometer apparatus for viewing the blades of a gas-turbine engine comprising: an optical radiation receiving head; a fibre-optic cable having one end coupled with said receiving head such that said cable transmits radiation received by said receiving head from the blades; an optical detector assembly, said optical detector assembly including a first rigid casing, a first mateable connector device on said casing in good thermal contact with said casing, an optical radiation detector device and amplifier means within said casing, said amplifier means having an input connected with said detector device and an output connected with said first connector device; and a processing unit, said processing unit including a second rigid casing, a second connector device on said second casing, electrical circuit means within said second casing, said circuit means having an input connected with said connector device, said circuit means being arranged to derive an indication of the temperature of said blades from the output of said amplifier means, said second connector device being adapted to mate and engage directly with the first connector device in good thermal contact with the first connector device such that the detector assembly is connected with and retained on said processing unit substantially solely by mating of the first and second connector devices without the interposition of any cables between the respective casings and such that equalisation of the temperatures of the two casings is promoted via the two connectors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8629492 | 1986-12-10 | ||
| GB868629492A GB8629492D0 (en) | 1986-12-10 | 1986-12-10 | Optical radiation sensor apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1307942C true CA1307942C (en) | 1992-09-29 |
Family
ID=10608761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000553318A Expired - Fee Related CA1307942C (en) | 1986-12-10 | 1987-12-02 | Optical radiation sensor apparatus |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4799787A (en) |
| JP (1) | JP2563191B2 (en) |
| CA (1) | CA1307942C (en) |
| DE (1) | DE3740693C2 (en) |
| ES (1) | ES2008379A6 (en) |
| FR (1) | FR2608277B1 (en) |
| GB (1) | GB8629492D0 (en) |
| IN (1) | IN172277B (en) |
| IT (1) | IT1223455B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5259881A (en) * | 1991-05-17 | 1993-11-09 | Materials Research Corporation | Wafer processing cluster tool batch preheating and degassing apparatus |
| DE8811776U1 (en) * | 1988-09-16 | 1988-12-29 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
| US5136841A (en) * | 1989-02-27 | 1992-08-11 | Zimmerman Ward H | Aircraft propulsion control system |
| US5044155A (en) * | 1989-02-27 | 1991-09-03 | The Boeing Company | Aircraft propulsion control system |
| US5282017A (en) * | 1990-01-05 | 1994-01-25 | Quantum Logic Corporation | Reflectance probe |
| GB9010181D0 (en) * | 1990-05-04 | 1990-06-27 | York Technology Ltd | Apparatus for analysing optical properties of transparent objects |
| US5769540A (en) * | 1990-04-10 | 1998-06-23 | Luxtron Corporation | Non-contact optical techniques for measuring surface conditions |
| US5154512A (en) * | 1990-04-10 | 1992-10-13 | Luxtron Corporation | Non-contact techniques for measuring temperature or radiation-heated objects |
| US5310260A (en) * | 1990-04-10 | 1994-05-10 | Luxtron Corporation | Non-contact optical techniques for measuring surface conditions |
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| US3064128A (en) * | 1958-10-17 | 1962-11-13 | Honeywell Regulator Co | Measuring apparatus |
| GB1049836A (en) * | 1963-11-21 | 1966-11-30 | Land Pyrometers Ltd | Improvements in or relating to radiation pyrometers |
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| GB1503042A (en) * | 1974-05-21 | 1978-03-08 | Smiths Industries Ltd | Radiation-detecting devices |
| GB1589531A (en) * | 1978-02-07 | 1981-05-13 | Smiths Industries Ltd | Optical devices and engine installations including such devices |
| JPS5583824A (en) * | 1978-12-21 | 1980-06-24 | Toshiba Corp | Photo high temperature measuring unit |
| US4527896A (en) * | 1982-03-04 | 1985-07-09 | Mikron Instrument Company, Inc. | Infrared transducer-transmitter for non-contact temperature measurement |
| DE3321028A1 (en) * | 1982-06-17 | 1983-12-22 | Smiths Industries Public Ltd. Co., London | OPTICAL COMPONENT |
| US4595839A (en) * | 1982-09-30 | 1986-06-17 | Tetra-Tech, Inc. | Bidirectional optical electronic converting connector with integral preamplification |
| GB8412219D0 (en) * | 1984-05-12 | 1984-06-20 | Smiths Industries Plc | Radiation-responsive apparatus |
| JPS6169130U (en) * | 1984-10-11 | 1986-05-12 | ||
| US4681434A (en) * | 1985-11-14 | 1987-07-21 | United Technologies Corporation | Dual spectra optical pyrometer having a serial array of photodectectors |
-
1986
- 1986-12-10 GB GB868629492A patent/GB8629492D0/en active Pending
-
1987
- 1987-11-23 IN IN1001DE1987 patent/IN172277B/en unknown
- 1987-11-25 US US07/125,267 patent/US4799787A/en not_active Expired - Fee Related
- 1987-11-26 IT IT22750/87A patent/IT1223455B/en active
- 1987-12-01 DE DE3740693A patent/DE3740693C2/en not_active Expired - Fee Related
- 1987-12-02 CA CA000553318A patent/CA1307942C/en not_active Expired - Fee Related
- 1987-12-09 FR FR8717377A patent/FR2608277B1/en not_active Expired - Fee Related
- 1987-12-09 ES ES8703516A patent/ES2008379A6/en not_active Expired
- 1987-12-10 JP JP62311165A patent/JP2563191B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3740693C2 (en) | 1997-07-31 |
| ES2008379A6 (en) | 1989-07-16 |
| IT8722750A0 (en) | 1987-11-26 |
| FR2608277A1 (en) | 1988-06-17 |
| DE3740693A1 (en) | 1988-06-16 |
| US4799787A (en) | 1989-01-24 |
| JP2563191B2 (en) | 1996-12-11 |
| IN172277B (en) | 1993-05-29 |
| FR2608277B1 (en) | 1993-10-29 |
| JPS63163125A (en) | 1988-07-06 |
| IT1223455B (en) | 1990-09-19 |
| GB8629492D0 (en) | 1987-01-21 |
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