CN101929879A - Optical fiber sensor for simultaneously sensing temperature and pressure - Google Patents
Optical fiber sensor for simultaneously sensing temperature and pressure Download PDFInfo
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- CN101929879A CN101929879A CN201010243270.7A CN201010243270A CN101929879A CN 101929879 A CN101929879 A CN 101929879A CN 201010243270 A CN201010243270 A CN 201010243270A CN 101929879 A CN101929879 A CN 101929879A
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Abstract
The invention discloses an optical fiber sensor for simultaneously sensing temperature and pressure; a detecting end of the sensor is provided with a temperature sensing head and a pressure sensing head which share a broadband light source as a signal light source; the optical fiber sensor uses an optical fiber wavelength division multiplexer to divide the light emitted by the broadband light source into transmission light and reflected light which are respectively used for measuring the stress and the temperature; two paths of sensing signals which are measured by the temperature sensing head and the pressure sensing head enter into an optical spectrum analyzer through a single-mode optical fiber directional coupler; and the optical spectrum analyzer is used for detecting the wavelength change of two groups of light peak values, so that the change of the temperature and the pressure of a measured point can be obtained. The sensor solves the problem that the temperature and the pressure are interfered by each other, and has better radiation resistance.
Description
Technical field
The present invention relates to a kind of optical sensor, more particularly say, be meant a kind of Fibre Optical Sensor that can measure temperature and pressure simultaneously.
Background technology
The measurement of temperature and pressure is most important in hospitality industry.Along with the popularization of small intrusive mood therapy, institute space exploration position is all extremely narrow in addition, and it is important that miniaturization becomes.Fiber size is little, corrosion-resistant, insensitive to electromagnetic radiation itself, and has a good bio-compatibility, make Fibre Optical Sensor because of its biological fitness, size is little, and cost is low, electrical insulating property, electromagnetic interference (EMI) has very big attractive force aspect the making of devices such as bioengineering, medical diagnosis and treatment field.
The research of fibre optic temperature sensor is one of most active research direction of sensory field of optic fibre.At present optical fiber sensing mechanism mainly contains excited fluorescence, interference, light absorption, thermic optical radiation, light scattering, birefringence etc., but at present the technology comparative maturity, begin to enter practical intrusive mood temperature sensor and have only F-P interfere type (FPI) fibre optic temperature sensor.
Compare with optical fiber temperature sensor technology, the degree of ripeness of fiber-optic pressure sensor technology and applicable cases relative deficiency, most of research is also all based on FPI.General adopt micro electronmechanical or the micro photo-electro-mechanical technology forms the FP chamber in optical fiber end because the Young modulus of quartzy and silicon materials is all higher, be difficult to realize physical stress measure need high pressure sensitivity, fail the fine physical stress Testing requirement that satisfies always.In addition, this technical sophistication, poor reliability, temperature influence is big, is easy to generate the temperature pressure sensing signal cross, has influenced its result of use.
In addition, must be enough greatly based on the sensing head size of the temperature and pressure sensor of FPI, otherwise its temperature stability and precision can be along with reducing of size variation.
Photonic crystal fiber is based on the theoretical made a kind of novel light transmitting fiber of photonic crystal.Its cladding regions be by many along fiber axis to micropore constitute.According to the difference in its core district, leaded light mechanism is also different, usually it is divided into two classes.A kind of is the refractive index light-guiding photonic crystal fiber.This optical fiber is solid, also becomes high index of refraction guided wave optical fiber, and its leaded light principle is similar to the total internal reflection conduction of standard, be according to the total internal reflection principle of revising, conduction light wave in solid, in this case, it is approximate that flashlight is subjected to temperature and stress influence situation and traditional fiber.Another kind is a photon band gap type photonic crystal fiber, and this fiber cores district refractive index is low, and the hole in its covering forms 2 D photon crystal by periodic arrangement.The structure of this two-dimensional and periodic variations in refractive index does not allow the light of some frequency range to propagate in the direction (laterally) perpendicular to fiber axis, forms so-called photon band gap.This leaded light principle has the different of essence with conventional fiber, it allows light to propagate in the low fibre core of refractive index ratio covering, generally be in air, to propagate, it is subjected to Temperature Influence minimum, thereby and the subtle change of pressure can cause that the structure of its covering airport changes band gap and changes guiding property, and promptly this optical fiber is extremely responsive to pressure.
Summary of the invention
Single in order to solve existing sensor function, and the problem of temperature and pressure mutual interference, the present invention proposes a kind of based on the Fibre Optical Sensor that can measure temperature and pressure simultaneously that is total to light source, wavelength-division multiplex.This Fibre Optical Sensor includes temperature and pressure processor 3, spectroanalysis instrument 5, wide spectrum light source 4, single-mode fiber directional coupler 6, Polarization Controller 7, optical fibre wavelength division multiplexer 8, first single-mode tail fiber 9, second single-mode tail fiber 10, pressure sensing head 1 and Temperature probe 2.Wherein, temperature and pressure processor 3 receives the peak wavelength situation of change that can be obtained transmitted spectrum and reflectance spectrum by the spectral characteristic of spectroanalysis instrument 5 outputs respectively.
The annexation of Fibre Optical Sensor of the present invention is: the A end welding of the tail optical fiber of wide spectrum light source 4 and fiber coupler 6; The fine welding of going into of the B of fiber coupler 6 end and Polarization Controller 7, the C end of fiber coupler 6 are connected with spectroanalysis instrument 5 and connect; The tail optical fiber of Polarization Controller 7 and wavelength-division utilize the A end welding of device 8; Wavelength-division utilizes an end welding of C end with first single-mode tail fiber 9 of device 8, the other end welding of the polarization-maintaining photonic crystal fiber 11 in the other end of first single-mode tail fiber 9 and the pressure sensing head 1; Wavelength-division utilizes an end welding of B end with second single-mode tail fiber 10 of device 8, an end welding of the panda optic fibre 21 in the other end of second single-mode tail fiber 10 and the Temperature probe 2; Link to each other by data line between the output terminal of spectroanalysis instrument 5 and the temperature and pressure processor 3; Temperature and pressure processor 3 is used for calculating and output temperature and force value.
The advantage that the present invention can measure the Fibre Optical Sensor of temperature and pressure simultaneously is:
1. utilize panda optic fibre to obtain the temperature information of measurand, be not subjected to electromagnetic interference (EMI) during measurement, make the temperature information that records accurately stable as Temperature probe.
2. utilize high double-refraction photon crystal fiber to obtain the pressure information of measurand as the pressure sensing head, not high, the unsettled defective of the measuring accuracy that not caused by temperature and electromagnetic interference (EMI) makes the pressure information that records accurate.
3. design is gone up and is adopted a light source to carry out the measurement of two-way information, has reduced the measuring error that flashing brings surely.
4. spectroanalysis instrument is combined with computing machine, enlarged the application of sensor; Can improve utilization again by being used of computing machine and software to the measured temperature that obtains, pressure.
5. can overcome complex structure, poor reliability, the problem of temperature and pressure phase mutual interference possesses better capability of resistance to radiation simultaneously.
Description of drawings
Fig. 1 is a structural drawing of forming Fibre Optical Sensor of the present invention.
Figure 1A is the light channel structure figure in the optical fibre wavelength division multiplexer on the Fibre Optical Sensor of the present invention.
Fig. 2 is the structural drawing of the pressure sensing head of Fibre Optical Sensor of the present invention.
Fig. 2 A is another visual angle structural drawing of the pressure sensing head of Fibre Optical Sensor of the present invention.
Fig. 3 is the structural drawing of the Temperature probe of Fibre Optical Sensor of the present invention.
Fig. 3 A is the exploded view of the Temperature probe of Fibre Optical Sensor of the present invention.
Fig. 3 B is the cut-open view of the Temperature probe of Fibre Optical Sensor of the present invention.
Fig. 4 is the surface chart of temperature and pressure test in the computing machine.
Among the figure: 1. pressure sensing head 11. polarization-maintaining photonic crystal fibers 12. single-mode fibers 13. baroreflex films 2. Temperature probes 21. panda protecting polarized light fibers 22. quartz ampoules 23. temperature reflectance coatings 24. heat-conducting silicone greases 3. temperature and pressure processors 4. wide spectrum light sources 5. spectroanalysis instruments 6. single-mode fiber directional couplers 7. Polarization Controllers 8. optical fibre wavelength division multiplexers 9. single-mode fibers 10. single-mode fibers
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to shown in Figure 1, the present invention is a kind of Fibre Optical Sensor that can measure temperature and pressure simultaneously, and this Fibre Optical Sensor includes temperature and pressure processor 3, spectroanalysis instrument 5, wide spectrum light source 4, single-mode fiber directional coupler 6, Polarization Controller 7, optical fibre wavelength division multiplexer 8, first single-mode tail fiber 9, second single-mode tail fiber 10, pressure sensing head 1 and Temperature probe 2.
Shown in Fig. 2, Fig. 2 A, pressure sensing head 1 includes polarization-maintaining photonic crystal fiber 11, single-mode fiber 12 and baroreflex film 13, one end welding of one end of single-mode fiber 12 and polarization-maintaining photonic crystal fiber 11 is coated with baroreflex film 13 on the end face of the other end of single-mode fiber 12; The other end welding of the other end of polarization-maintaining photonic crystal fiber 11 and first single-mode tail fiber 9; The material that described baroreflex film 13 is selected for use is silicon dioxide or titania.
Shown in Fig. 3, Fig. 3 A, Fig. 3 B, Temperature probe 2 includes panda optic fibre 21, quartz ampoule 22, temperature reflectance coating 23 and heat-conducting silicone grease 24; The other end welding of one end of panda optic fibre 21 and second single-mode tail fiber 10 is coated with temperature reflectance coating 23 on the end face of the other end of panda optic fibre 21; The structure that temperature reflectance coating 23 is plated on the end face of the other end of panda optic fibre 21 is called the thermometric preform, this thermometric preform inserts in the quartz ampoule 22, and as filler, fully fill up the gap between thermometric preform and the quartz ampoule 22 with heat-conducting silicone grease 24.The material that described temperature reflectance coating 23 is selected for use is silicon dioxide or titania.
To the function that each device in the sensor of the present invention is realized be elaborated below:
(1) the temperature and pressure processor 3
Temperature and pressure processor 3 includes a computing machine, and is stored in Temperature Treatment module and pressure treatment module in this computing machine;
In the present invention, computing machine is a kind ofly can carry out the modernized intelligent electronic device of massive values computation and various information processings automatically, at high speed according to prior program stored.Minimalist configuration is CPU 2GHz, internal memory 2GB, hard disk 180GB; Operating system is windows 2000/2003/XP.
In the present invention, the Temperature Treatment module adopts the VC language compilation, be used to realize the temperature spectral characteristic of spectroanalysis instrument 5 outputs is handled, be presented in the computer screen thereby obtain temperature value T, to make things convenient for the user to observe and the multidate information of sensor is grasped.
In the present invention, the pressure treatment module adopts the VC language compilation, be used to realize the pressure spectral characteristic of spectroanalysis instrument 5 outputs is handled, be presented in the computer screen thereby obtain pressure value P, to make things convenient for the user to observe and the multidate information of sensor is grasped.
Temperature and pressure processor 3 receives the peak wavelength situation of change that can be obtained transmitted spectrum and reflectance spectrum by the spectral characteristic of spectroanalysis instrument 5 outputs respectively.The peak wavelength of variation of temperature and reflectance spectrum is varied to direct ratio
K
1The scale-up factor of expression temperature, T represents to measure the temperature of acquisition,
The average wavelength of expression reflectance spectrum, λ
1The peak wavelength of choosing in the expression reflectance spectrum, C
1The correction constant of expression temperature; In like manner, the peak wavelength of the variation of pressure and transmitted spectrum is varied to direct ratio
K
2The scale-up factor of expression pressure, P represents to measure the pressure of acquisition,
The average wavelength of expression refraction spectrum, λ
2The peak wavelength of choosing in the expression transmitted spectrum, C
2The correction constant of expression pressure.
Temperature and pressure processor 3 is found the solution last two formulas with the spectrum parameter that collects by software program can obtain temperature and stress intensity, and the result is presented on the interface, and this interface as shown in Figure 4; Temperature and time shown in the figure, pressure and time relation curve.
Wherein, the real time temperature distribution curve can be expressed the temperature value (Temperature) of arbitrary time point in the monitoring time section (time) intuitively, and in can the grid with the data presentation on the left side, calculates simultaneously and the temperature difference of last one second, and is shown.
Wherein, the real-time pressure distribution curve can be expressed the force value (Pressure) of arbitrary time point in the monitoring time section (time) intuitively, and in can the grid with the data presentation on the left side, calculates simultaneously and the pressure differential of last one second, and is shown.
(2) spectroanalysis instrument 5
(3) wide spectrum light source 4
Wide spectrum light source 4 can be simultaneously provides suitable light signal for pressure sensing head 1 and Temperature probe 2.Light source 4 is a wide spectrum light source; Selecting for use is Er-Doped superfluorescent fiber source (SFS), and its centre wavelength is 1545nm, and output power is greater than 10mW, and bandwidth is greater than 40nm.
(4) the single-mode fiber directional coupler 6
Single-mode fiber directional coupler 6 is selected four ports for use, and promptly two go into two and go out, and can be that the light of 1550nm transmits to centre wavelength.In the present invention, the single-mode optical-fibre coupler of 50/50 beam split of typical 4 port organizations that fiber coupler employing ORTE Photonics company produces, A end, C end are generally the optical fibre input end of fiber coupler, and the B end is the tail optical fiber end of fiber coupler.Operation wavelength 1550nm, typical additive loss 0.07dB inserts loss less than 3.4dB.
(5) Polarization Controller 7
Described Polarization Controller utilizes the stress of the rotation generation of three fiber optic loop to optical fiber, thereby adjusts polarization state of light, and the signal polarisation of light is remained on the fixed-direction.What select for use here is the tricyclic mechanical type optical fiber polarization controller that Connet Fiber Optics company produces.
(6) wavelength division multiplexer 8
Described WDM is divided into transmitted spectrum and reflectance spectrum with spectrum, is respectively applied for pressure and temperature and surveys.What select for use here is Coarse Wave Division Multiplexer (CWDM) the employing film filtering technique of Orcon Corp., and wavelength covers 1270nm to 1610nm scope, meets ITU Coarse Wavelength Division Multiplexing standard G.694.2.
(7) first single-mode tail fibers 9
Described first single-mode tail fiber 9 enters the pressure sensing head with the transmitted light transmission.
(8) second single-mode tail fibers 10
Described second single-mode tail fiber 10 enters Temperature probe with the reflected light transmission.
(9) the pressure sensing head 1
Described pressure sensing head carries out pressure sensing, and transmitted light transmits in the fiber segment (polarization-maintaining photonic crystal fiber 11) of pressure sensing head, and when the external world introduced pressure, the spectrum of transmitted light will change.What in the present invention, polarization-maintaining photonic crystal fiber 11 was selected for use is HC-1550-PM-01 type polarization-maintaining photonic crystal fiber (production of Crystal-Fiber company)
(10) Temperature probe 2
Described Temperature probe carries out temperature sensing, and reflected light transmits in the fiber segment (panda optic fibre 21) of pressure sensing head, and when ambient temperature changed, catoptrical spectrum will change.What in the present invention, panda optic fibre 21 was selected for use is to clap the long panda type polarization-preserving fiber of 2.056mm that is.
The annexation of fibre optic temperature sensor of the present invention is: A end (going into fibre for one that is fiber coupler) welding of the tail optical fiber of wide spectrum light source 4 and fiber coupler 6; The B end (being a tail optical fiber of fiber coupler) of fiber coupler 6 is held (being another root tail optical fiber of fiber coupler) to be connected with spectroanalysis instrument 5 and is connect with the fine welding of going into of Polarization Controller 7, the C of fiber coupler 6; The tail optical fiber of Polarization Controller 7 and wavelength-division utilize A end (being input optical fibre) welding of device 8; Wavelength-division utilizes an end welding of C end (being transmission end tail optical fiber) with first single-mode tail fiber 9 of device 8, the other end welding of the polarization-maintaining photonic crystal fiber 11 in the other end of first single-mode tail fiber 9 and the pressure sensing head 1; Wavelength-division utilizes an end welding of B end (being the reflection end tail optical fiber) with second single-mode tail fiber 10 of device 8, an end welding of the panda optic fibre 21 in the other end of second single-mode tail fiber 10 and the Temperature probe 2; Link to each other by data line between the output terminal of spectroanalysis instrument 5 and the temperature and pressure processor 3; Temperature and pressure processor 3 is used for calculating and output temperature and force value.
Shown in Figure 1A, the optic path of Fibre Optical Sensor when carrying out temperature survey of the present invention's design is:
Flashlight process directional coupler 6 that wide spectrum light source 4 sends and Polarization Controller 7 backs enter from the A end of wavelength division multiplexer 8; Wavelength division multiplexer 8 is divided into reflected light and transmitted light two parts with the spectrum of flashlight then, and reflected light and transmitted light are not overlapping; Reflected light wherein enters in the Temperature probe 2 through second single-mode fiber 10, and is reflected back toward at temperature reflectance coating 23 places of Temperature probe 2, and the reflected light of reflected back is called the temperature reflected light; This temperature reflected light B end from wavelength division multiplexer 8 behind second single-mode fiber 10 enters, the temperature reflected light merges with baroreflex light in wavelength division multiplexer 8, obtain merging light, this merges the A end output of light from wavelength division multiplexer 8, and in turn behind Polarization Controller 7, single-mode fiber directional coupler 6, and export spectroanalysis instrument 5 to from the C port of single-mode fiber directional coupler 6.
Shown in Figure 1A, the optic path of Fibre Optical Sensor when carrying out pressure survey of the present invention's design is:
Flashlight process directional coupler 6 that wide spectrum light source 4 sends and Polarization Controller 7 backs enter from the A end of wavelength division multiplexer 8; Wavelength division multiplexer 8 is divided into reflected light and transmitted light two parts with the spectrum of flashlight then, and reflected light and transmitted light are not overlapping; Transmitted light wherein enters in the pressure sensing head 1 through first single-mode fiber 9, and is reflected back toward at baroreflex film 13 places of pressure sensing head 1, and the transmitted light of reflected back is called baroreflex light; This baroreflex light C end from wavelength division multiplexer 8 behind first single-mode fiber 9 enters, baroreflex light merges with the temperature reflected light in wavelength division multiplexer 8, obtain merging light, this merges the A end output of light from wavelength division multiplexer 8, and in turn behind Polarization Controller 7, single-mode fiber directional coupler 6, and export spectroanalysis instrument 5 to from the C port of single-mode fiber directional coupler 6.
In the present invention, thus light source select wide spectrum light source can effectively reduce the catoptrical ghost effect of locating at fibre-optical splice etc. to improve system performance.And adopt a light source simultaneously for the sensing of temperature and pressure provides light signal, increased the integration of system greatly and reduced cost.
In the present invention, use the wavelength detection technique to reduce because the light source output power fluctuation that factors such as aging and rig-site utilization cause and the influence of device loss.
A kind of Fibre Optical Sensor that can measure temperature and pressure simultaneously that the present invention relates to, be by using a wide spectrum light source 4 as the sensor light source, wavelength division multiplexer 8 decomposes spectrum, be respectively applied for the measurement of temperature and pressure, spectrum after the decomposition does not almost intersect, intuitive measurement results, the mode that detects by wavelength obtains the result, has reduced error effectively; Photonic crystal fiber 11 has reduced measurement result for pressure better than more responsive this characteristic of ordinary optic fibre and has produced the error of crosstalking for temperature-insensitive; It is little that optical fiber temperature and pressure sensor of the present invention has a volume, and it is convenient to realize, high reliability features.
Claims (9)
1. the Fibre Optical Sensor that can measure temperature and pressure simultaneously, include computing machine, spectroanalysis instrument (5), it is characterized in that: also include wide spectrum light source (4), single-mode fiber directional coupler (6), Polarization Controller (7), optical fibre wavelength division multiplexer (8), first single-mode tail fiber (9), second single-mode tail fiber (10), pressure sensing head (1) and Temperature probe (2);
Described computing machine and Temperature Treatment module, pressure treatment module constitute temperature and pressure processor (3);
Pressure sensing head (1) includes polarization-maintaining photonic crystal fiber (11), single-mode fiber (12) and baroreflex film (13), one end welding of one end of single-mode fiber (12) and polarization-maintaining photonic crystal fiber (11) is coated with baroreflex film (13) on the end face of the other end of single-mode fiber (12); The other end welding of the other end of polarization-maintaining photonic crystal fiber (11) and first single-mode tail fiber (9);
Temperature probe (2) includes panda optic fibre (21), quartz ampoule (22), temperature reflectance coating (23) and heat-conducting silicone grease (24); The other end welding of one end of panda optic fibre (21) and second single-mode tail fiber (10) is coated with temperature reflectance coating (23) on the end face of the other end of panda optic fibre (21); The structure that temperature reflectance coating (23) is plated on the end face of the other end of panda optic fibre (21) is called the thermometric preform, this thermometric preform inserts in the quartz ampoule (22), and as filler, fully fill up the gap between thermometric preform and the quartz ampoule (22) with heat-conducting silicone grease (24);
The annexation of described Fibre Optical Sensor is: the A end welding of the tail optical fiber of wide spectrum light source (4) and fiber coupler (6); The fine welding of going into of the B of fiber coupler (6) end and Polarization Controller (7), the C end of fiber coupler (6) are connected with spectroanalysis instrument (5) and connect; The tail optical fiber of Polarization Controller (7) and wavelength-division utilize the A end welding of device (8); Wavelength-division utilizes an end welding of C end with first single-mode tail fiber (9) of device (8), the other end welding of the polarization-maintaining photonic crystal fiber (11) in the other end of first single-mode tail fiber (9) and the pressure sensing head (1); Wavelength-division utilizes an end welding of B end with second single-mode tail fiber (10) of device (8), an end welding of the panda optic fibre (21) in the other end of second single-mode tail fiber (10) and the Temperature probe (2); Link to each other by data line between the output terminal of spectroanalysis instrument (5) and the temperature and pressure processor (3); Temperature and pressure processor (3) is used for calculating and output temperature and force value.
2. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: the material that described baroreflex film (13) is selected for use is silicon dioxide or titania.
3. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: the material that described temperature reflectance coating (23) is selected for use is silicon dioxide or titania.
4. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: temperature and pressure processor (3) receives the peak wavelength situation of change that is obtained transmitted spectrum and reflectance spectrum by the spectral characteristic of spectroanalysis instrument (5) output respectively; The peak wavelength of variation of temperature and reflectance spectrum is varied to direct ratio
K
1The scale-up factor of expression temperature, T represents to measure the temperature of acquisition,
The average wavelength of expression reflectance spectrum, λ
1The peak wavelength of choosing in the expression reflectance spectrum, C
1The correction constant of expression temperature; In like manner, the peak wavelength of the variation of pressure and transmitted spectrum is varied to direct ratio
K
2The scale-up factor of expression pressure, P represents to measure the pressure of acquisition,
The average wavelength of expression refraction spectrum, λ
2The peak wavelength of choosing in the expression transmitted spectrum, C
2The correction constant of expression pressure.
5. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: the optic path of this Fibre Optical Sensor when carrying out temperature survey is: flashlight process directional coupler (6) that wide spectrum light source (4) sends and Polarization Controller (7) back enter from the A end of wavelength division multiplexer (8); Wavelength division multiplexer (8) is divided into reflected light and transmitted light two parts with the spectrum of flashlight then, and reflected light and transmitted light are not overlapping; Reflected light wherein enters in the Temperature probe (2) through second single-mode fiber (10), and locates to be reflected back toward at the temperature reflectance coating (23) of Temperature probe (2), and the reflected light of reflected back is called the temperature reflected light; This temperature reflected light B end from wavelength division multiplexer (8) behind second single-mode fiber (10) enters, the temperature reflected light merges with baroreflex light in wavelength division multiplexer (8), obtain merging light, this merges the A end output of light from wavelength division multiplexer (8), and in turn behind Polarization Controller (7), single-mode fiber directional coupler (6), and export spectroanalysis instrument (5) to from the C port of single-mode fiber directional coupler (6).
6. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: the optic path of this Fibre Optical Sensor when carrying out pressure survey is: flashlight process directional coupler (6) that wide spectrum light source (4) sends and Polarization Controller (7) back enter from the A end of wavelength division multiplexer (8); Wavelength division multiplexer (8) is divided into reflected light and transmitted light two parts with the spectrum of flashlight then, and reflected light and transmitted light are not overlapping; Transmitted light wherein enters in the pressure sensing head (1) through first single-mode fiber (9), and locates to be reflected back toward at the baroreflex film (13) of pressure sensing head (1), and the transmitted light of reflected back is called baroreflex light; This baroreflex light C end from wavelength division multiplexer (8) behind first single-mode fiber (9) enters, baroreflex light merges with the temperature reflected light in wavelength division multiplexer (8), obtain merging light, this merges the A end output of light from wavelength division multiplexer (8), and in turn behind Polarization Controller (7), single-mode fiber directional coupler (6), and export spectroanalysis instrument (5) to from the C port of single-mode fiber directional coupler 6.
7. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: it is Er-Doped superfluorescent fiber source that wide spectrum light source (4) is selected for use, and its centre wavelength is 1545nm, and output power is greater than 10mW, and bandwidth is greater than 40nm.
8. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: being used for pressure sensing optical fiber is polarization-maintaining photonic crystal fiber.
9. the Fibre Optical Sensor that can measure temperature and pressure simultaneously according to claim 1 is characterized in that: being used for temperature sensing is the stress type polarization maintaining optical fibre.
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| CN111537009A (en) * | 2020-05-28 | 2020-08-14 | 山东省科学院激光研究所 | Disposable optical fiber temperature and pressure sensor based on spectrum partition and sensing system thereof |
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| CN105115436A (en) * | 2015-08-04 | 2015-12-02 | 苏州光环科技有限公司 | sensing device and method for monitoring stress and temperature |
| CN105115436B (en) * | 2015-08-04 | 2017-11-17 | 苏州光环科技有限公司 | The method of sensing device and monitor stress and temperature |
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| CN106644159A (en) * | 2016-12-21 | 2017-05-10 | 中国电子科技集团公司电子科学研究院 | Optical fiber sensor, optical fiber sensor manufacturing method and optical fiber sensor measuring system |
| CN106644159B (en) * | 2016-12-21 | 2024-02-13 | 中国电子科技集团公司电子科学研究院 | Optical fiber sensor, optical fiber sensor manufacturing method, and optical fiber sensor measurement system |
| CN108225604A (en) * | 2017-12-29 | 2018-06-29 | 长园深瑞继保自动化有限公司 | Optical fiber temperature-measurement sensing head, temperature measuring equipment and temp measuring method |
| CN109141700A (en) * | 2018-08-17 | 2019-01-04 | 天津大学 | The double light source low coherence interference pressure-temperature measuring systems of Fabry-perot optical fiber and method |
| CN109916533A (en) * | 2019-03-15 | 2019-06-21 | 哈尔滨工程大学 | A kind of polarization-maintaining grating FP chamber temperature strain simultaneous measuring apparatus of PDH demodulation |
| CN110706473A (en) * | 2019-09-06 | 2020-01-17 | 南京工程学院 | Gas data acquisition device and data acquisition method based on single-wavelength reflection |
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| CN111537009A (en) * | 2020-05-28 | 2020-08-14 | 山东省科学院激光研究所 | Disposable optical fiber temperature and pressure sensor based on spectrum partition and sensing system thereof |
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