DE4302836A1 - Electronic circuit for processing passive IR sensor signals, esp. for monitoring motion in room - Google Patents
Electronic circuit for processing passive IR sensor signals, esp. for monitoring motion in roomInfo
- Publication number
- DE4302836A1 DE4302836A1 DE19934302836 DE4302836A DE4302836A1 DE 4302836 A1 DE4302836 A1 DE 4302836A1 DE 19934302836 DE19934302836 DE 19934302836 DE 4302836 A DE4302836 A DE 4302836A DE 4302836 A1 DE4302836 A1 DE 4302836A1
- Authority
- DE
- Germany
- Prior art keywords
- esp
- noise
- electronic circuit
- room
- sensor signals
- 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.)
- Withdrawn
Links
- 238000012544 monitoring process Methods 0.000 title 1
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- 230000009977 dual effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
- G08B13/191—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using pyroelectric sensor means
Abstract
Description
Ein in der Meßtechnik bekanntes Modulationsverfahren zur Unterdrückung von Rauschanteilen im Bereich sehr niedriger Frequenzen (1/f Rauschen) ist auf die Meßwerterfassung in Bewegungsmeldern angewendet worden.A modulation method known in measurement technology for suppressing Noise components in the range of very low frequencies (1 / f noise) is on the Measured value acquisition has been used in motion detectors.
Literaturstellen: Tietze Schenk, 1971, Kapitel 11.16 Analog-Multiplizierer, S 289 und Kapitel 19.8 Zerhacker als Modulator und Synchrondemodulator, S 549.References: Tietze Schenk, 1971, Chapter 11.16 Analog Multiplier, p 289 and Chapter 19.8 Chopper as a modulator and synchronous demodulator, S 549.
Ziel dieses Verfahrens ist es, sehr kleine Temperaturdifferenzen, meßbar durch Intensitätsunterschiede in der Wärmestrahlung (thermisches Infrarot) im Bereich von 4-14 µm, zu erfassen. Damit verbunden ist auch die Vergrößerung der Reichweite. Besonders bei Bewegungsmeldern mit kleinen Linsendurchmessern, ist dies von erheblicher Bedeutung.The aim of this method is to measure very small temperature differences Differences in intensity in the thermal radiation (thermal infrared) in the area of 4-14 µm. Associated with this is the enlargement of the Range. Especially with motion detectors with small lens diameters, this is of considerable importance.
Das zum Patentanspruch angegebene Verfahren nebst schaltungstechnischem Vorschlag soll folgendes Problem lösen helfen:The method specified for the claim along with circuitry Proposal should help solve the following problem:
Durch die Miniaturisierung von Bewegungsmeldern ist auch eine Verkleinerung des Linsensystems verbunden. Hierdurch ist die Reichweite, bedingt durch die verringerte Temperaturauflösung, begrenzt, vergleichbar mit der geringen Lichtstärke bei Ferngläsern mit kleinen Linsendurchmesser.The miniaturization of motion detectors is also a downsizing connected to the lens system. This is the range, due to the reduced temperature resolution, limited, comparable to the low one Luminous intensity for binoculars with small lens diameters.
Ein weiteres Problem besteht in dem Aufwand an Elektronik, weshalb dieses Verfahren meist nur in teurer Meßtechnik ihren Einsatz findet. Deshalb wird auch ein schaltungstechnischer Vorschlag gemacht (Bild 1), der die Kosten senkt und somit den Einsatz dieser Technik sogar in preiswerten Bewegungsmeldern ermöglicht.Another problem is the expenditure on electronics, which is why this method is usually only used in expensive measuring technology. For this reason, a circuitry proposal is made ( Figure 1) that reduces costs and thus enables this technology to be used even in inexpensive motion detectors.
Das Auflösungsvermögen eines PIR Sensors wird zwar einerseits durch die Größe des Linsendurchmessers bestimmt (und der soll klein sein) andererseits aber auch durch den Signal/Rauschabstand. Die Signalfrequenzen liegen in einem Bereich von 0,5 Hz bis 15 Hz, einem Bereich, in dem das 1/f-Rauschen einen besonders großen Einfluß hat. Die Vergrößerung des Rauschabstandes erfolgt durch eine Multiplikation mit einer höheren Frequenz (Amplitudenmodulation) und einer anschließenden Synchrondemodulation. Die Frequenz der Modulationsspannung liegt im Bereich von 1 bis 5 kHz und wird im Controller erzeugt, der damit eine Konstantstromquelle für den im Sensormodul befindlichen Differenzverstärker steuert. Die Multiplikation mit dem Meßsignal erfolgt also im Sensormodul und wird nach entsprechend hoher Verstärkung der modulierten Spannung im Controller durch den Sample & Hold Eingang des AD Wandlers synchron demoduliert.The resolution of a PIR sensor is determined by the size the lens diameter determines (and it should be small) on the other hand through the signal / noise ratio. The signal frequencies are in one range from 0.5 Hz to 15 Hz, a range in which the 1 / f noise is special has great influence. The signal-to-noise ratio is increased by a Multiplication by a higher frequency (amplitude modulation) and one subsequent synchronous demodulation. The frequency of the modulation voltage lies in the range of 1 to 5 kHz and is generated in the controller, which is a Constant current source for the differential amplifier in the sensor module controls. The multiplication with the measurement signal thus takes place in the sensor module and is after correspondingly high amplification of the modulated voltage in the controller synchronously demodulated by the sample and hold input of the AD converter.
Das miniaturisierte Multi-Sensormodul liefert mit den integrierten Anteilen eines temperaturkompensierten Analog-Multiplizierers einen wesentlichen Bestandteil des beschriebenen Modulationsverfahrens. In Kombination mit einem Standard- Microcontroller, der alle notwendigen Funktionen übernimmt, durch seine Programmierbarkeit eine hohe Flexibilität besitzt und zusätzlich eine Reihe externer Analogfunktionen entfallen läßt, können, gegenüber Schaltungen mit gleichen Leistungsdaten in herkömmlicher Technik, durch die Senkung der Anzahl von Bauteilen erhebliche Kostenvorteile entstehen.The miniaturized multi-sensor module with the integrated parts delivers one temperature-compensated analog multiplier an essential component the modulation method described. In combination with a standard Microcontroller that takes over all the necessary functions through its Programmability has a high flexibility and also a number of external ones Analog functions can be omitted, compared to circuits with the same Performance data in conventional technology, by reducing the number of Components have considerable cost advantages.
Claims (1)
Der Schaltungsvorschlag sieht den Einsatz eines Microcontrollers mit integriertem AD Wandler als Synchrondemodulator vor sowie ein Sensormodul mit integrierter Elektronik für die Modulation durch einen Zweiquadrantenmultiplizierer (stromgesteuerter Differenzverstärker).Electronics for modulating and demodulating measurement signals with the aim of suppressing low-frequency noise components (sparkle noise, also 1 / f noise) with passive infrared (PIR) sensors, especially in motion detectors for indoor use.
The proposed circuit provides for the use of a microcontroller with an integrated AD converter as a synchronous demodulator and a sensor module with integrated electronics for modulation by a two-quadrant multiplier (current-controlled differential amplifier).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934302836 DE4302836A1 (en) | 1993-01-26 | 1993-01-26 | Electronic circuit for processing passive IR sensor signals, esp. for monitoring motion in room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934302836 DE4302836A1 (en) | 1993-01-26 | 1993-01-26 | Electronic circuit for processing passive IR sensor signals, esp. for monitoring motion in room |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4302836A1 true DE4302836A1 (en) | 1994-07-28 |
Family
ID=6479412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19934302836 Withdrawn DE4302836A1 (en) | 1993-01-26 | 1993-01-26 | Electronic circuit for processing passive IR sensor signals, esp. for monitoring motion in room |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE4302836A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998034206A1 (en) * | 1997-02-04 | 1998-08-06 | Mytech Corporation | Occupancy sensor and method of operating same |
| US5986357A (en) * | 1997-02-04 | 1999-11-16 | Mytech Corporation | Occupancy sensor and method of operating same |
-
1993
- 1993-01-26 DE DE19934302836 patent/DE4302836A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998034206A1 (en) * | 1997-02-04 | 1998-08-06 | Mytech Corporation | Occupancy sensor and method of operating same |
| US5986357A (en) * | 1997-02-04 | 1999-11-16 | Mytech Corporation | Occupancy sensor and method of operating same |
| US6078253A (en) * | 1997-02-04 | 2000-06-20 | Mytech Corporation | Occupancy sensor and method of operating same |
| US6415205B1 (en) | 1997-02-04 | 2002-07-02 | Mytech Corporation | Occupancy sensor and method of operating same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8122 | Nonbinding interest in granting licenses declared | ||
| 8139 | Disposal/non-payment of the annual fee |