CN103712775A - Device for measuring time constant of pyroelectric detector - Google Patents
Device for measuring time constant of pyroelectric detector Download PDFInfo
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- CN103712775A CN103712775A CN201310694616.9A CN201310694616A CN103712775A CN 103712775 A CN103712775 A CN 103712775A CN 201310694616 A CN201310694616 A CN 201310694616A CN 103712775 A CN103712775 A CN 103712775A
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- pyroelectric detector
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Abstract
The embodiment of the invention discloses a device for measuring a time constant of a pyroelectric detector. The device comprises a laser pulse generation device which generates a laser pulse with a predetermined frequency, and the laser pulse can be irradiated to the pyroelectric detector; and an output signal acquisition device which is connected with the pyroelectric detector and acquires an output signal which is generated in a way that the pyroelectric detector responds to the laser pulse. According to the device for measuring the time constant of the pyroelectric detector, a pulse generation control circuit controls an output frequency of a laser diode so that an accurate frequency value can be outputted; the laser pulse generation device is separated from the pyroelectric detector so that bring-in of unnecessary noise in a test process is avoided, and measurement accuracy is enhanced; meanwhile, measured data can be completely read out visually, and an intact measured waveform figure can be stored so that test efficiency is enhanced.
Description
Technical field
The present invention relates to pyroelectric detector technical field, especially relate to a kind of device of measuring the time constant of pyroelectric detector.
Background technology
For different target sources, reasonably select the time constant of pyroelectric detector, just can obtain required target information.Therefore, time constant is the important parameter of system.
Along with pyroelectric detector is applied more and more widely at aspects such as infrared spectrometry, laser power metering, intrusion alarm, fire alarm, gas analysis, actinometry, train shaft temperature measurements, find a kind of method of simple and practical Measuring Time constant to seem particularly important.
In the equipment of existing measurement pyroelectric detector time constant, there is the problems such as frequency is difficult to control, measurement data is unstable, efficiency is low.
Summary of the invention
One of object of the present invention is to provide a kind of device of very simply measuring the time constant of pyroelectric detector.
One of object of the present invention is to provide the device of the time constant of the measurement pyroelectric detector that a kind of frequency is easily controlled, measurement data stable, efficiency is high.
Technical scheme disclosed by the invention comprises:
A kind of device of measuring the time constant of pyroelectric detector is provided, has it is characterized in that, having comprised: laser pulse generating apparatus, described laser pulse generating apparatus produces the laser pulse of preset frequency, and described laser pulse can be irradiated on pyroelectric detector; Output signal harvester, described output signal harvester is connected to pyroelectric detector, and gathers that described pyroelectric detector responds described laser pulse and the output signal that produces.
In one embodiment of the present of invention, described laser pulse generating apparatus comprises: bias voltage source; Laser pulse generative circuit, described bias voltage source is connected to described laser pulse generative circuit and is described laser pulse generative circuit power supply; Pulse generate control circuit, described pulse generate control circuit is connected to described laser pulse generative circuit, and controls the laser pulse that described laser pulse generative circuit produces preset frequency, and described laser pulses irradiate is to pyroelectric detector.
In one embodiment of the present of invention, described pulse generate control circuit is square wave generation circuit.
In one embodiment of the present of invention, described laser pulse generative circuit comprises laser diode, the first resistance, the second resistance and triode, wherein: the positive pole of described laser diode is connected to described bias voltage source and by described the first resistance, is connected to the base stage of described triode; The negative pole of described laser diode is connected to the collector of described triode by described the second resistance; The base stage of described triode is connected to described pulse generate control circuit, and emitter is connected to ground.
In one embodiment of the present of invention, described output signal harvester comprises: signal amplification circuit, and described signal amplification circuit is connected to described pyroelectric detector, and amplifies the described output signal of described pyroelectric detector; Signal is processed and display device, and described signal processing and display apparatus processes and show the described output signal of having amplified through described signal amplification circuit obtain the time constant of described pyroelectric detector according to described output signal.
In one embodiment of the present of invention, described signal is processed and display device is oscillograph.
In the device of the time constant of the measurement pyroelectric detector of the embodiment of the present invention, pulse generate control circuit is controlled the output frequency of laser diode, can export frequency values accurately; Laser pulse generating apparatus separates with pyroelectric detector, has avoided bringing in test process unnecessary noise, the accuracy of the measurement of raising; Measurement data can be read completely intuitively simultaneously, and can preserve complete measured waveform figure, has improved testing efficiency.
Accompanying drawing explanation
Fig. 1 is the block diagram representation of device of time constant of the measurement pyroelectric detector of one embodiment of the invention.
Fig. 2 is the circuit diagram of the laser pulse generative circuit of one embodiment of the invention.
Fig. 3 is the circuit diagram of the signal amplification circuit of one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, describe the device of time constant of the measurement pyroelectric detector of embodiments of the invention in detail.
As shown in Figure 1, in one embodiment of the invention, a kind of device of time constant of measurement pyroelectric detector can comprise laser pulse generating apparatus 10 and output signal harvester 20.Laser pulse generating apparatus 10 produces the laser pulse of preset frequency, and this laser pulse can be irradiated on pyroelectric detector 30.Output signal harvester 20 is connected to pyroelectric detector 30, and gathers this pyroelectric detector 30 response laser pulse generating apparatus 10 and produce and be irradiated to this laser pulse on pyroelectric detector 30 and the output signal that produces.
As shown in Figure 1, laser pulse generating apparatus 10 can comprise bias voltage source 101, laser pulse generative circuit 102 and pulse generate control circuit 103.
In embodiments of the invention, bias voltage source 101 is stabilized voltage supply, guarantees that laser diode is luminous, can need to change its output valve according to test, is conventionally not more than 25V.
Pulse generate control circuit 103 is connected to laser pulse generative circuit 102, and controls the laser pulse that this laser pulse generative circuit 102 produces preset frequency.In the time need to measuring the time constant of pyroelectric detector 30, the laser pulses irradiate that laser pulse generative circuit 102 can be produced is to pyroelectric detector 30.Now, pyroelectric detector 30 will produce response and produce output signal this laser pulse irradiating.Output signal harvester 20 can gather, processes and show these output signals.
As shown in Figure 2, in one embodiment of the present of invention, laser pulse generative circuit 102 can comprise laser diode D1, the first resistance R 1, the second resistance R 2 and triode Q1.Wherein, triode Q1 is operated in on-off circuit state.Anodal one end of laser diode D1 is connected to aforesaid bias voltage source 101 and by the first resistance R 1, is connected to the base stage of Q1 triode; The negative pole of this laser diode D1 is connected to the Q1 collector of triode by the second resistance R 2; The base stage of this triode Q1 is connected to aforesaid pulse generate control circuit 103, and emitter is connected to ground.
In embodiments of the invention, the laser pulse that pulse generate control circuit 103 can be according to actual needs and flexible design, to produce the laser pulse of expectation.For example, in an embodiment, pulse generate control circuit 103 can be square wave generation circuit, the square wave that this square wave generation circuit produces switches the triode Q1 in laser pulse generative circuit 102 between saturated and two states of cut-off, thereby control the luminance of the laser diode in laser pulse generative circuit 102, thereby produce the laser pulse of expectation.
The effect of square-wave signal has two, and the one, ensure the sufficient response time, make detector waveform reach peak-to-peak value, the 2nd, control and provide fast synchronizing signal, make triode be operated in on-off circuit, between saturated and two states of cut-off, switch, thus the luminance of control laser diode.Laser diode is that electricity causes photo emissions, and its rise time is after testing
, and almost can provide synchronous electric signal simultaneously.Therefore, the laser pulse source forming with laser diode, more reliable than mechanical or manual method.Overcome the shortcoming of legacy test system wayward frequency, poor stability.
As shown in Figure 1, in embodiments of the invention, output signal harvester 20 can comprise signal amplification circuit 201 and signal processing and display device 202.Signal amplification circuit 201 is connected to pyroelectric detector 30, and amplifies the aforesaid output signal of pyroelectric detector 30.Signal is processed and display device 202 is processed and show and pass through the aforementioned output signal that signal amplification circuit 201 has amplified, and can obtain the time constant of this pyroelectric detector 30 according to this output signal.
In embodiments of the invention, signal amplification circuit 201 can be the circuit amplifying for signal being applicable to.For example, in an embodiment, the circuit diagram of signal amplification circuit 201 as shown in Figure 3.It utilizes the size of R3 and R4 ratio to control the multiple that output signal is amplified.
In embodiments of the invention, signal is processed and display device can be applicable data processing and display device.For example, in an embodiment, this signal is processed and display device can be oscillograph.
In the device of the time constant of the measurement pyroelectric detector of the embodiment of the present invention, pulse generate control circuit is controlled the output frequency of laser diode, can export frequency values accurately; Laser pulse generating apparatus separates with pyroelectric detector, has avoided bringing in test process unnecessary noise, the accuracy of the measurement of raising; Measurement data can be read completely intuitively simultaneously, and can preserve complete measured waveform figure, has improved testing efficiency.
By specific embodiment, describe the present invention above, but the present invention is not limited to these specific embodiments.It will be understood by those skilled in the art that and can also make various modifications to the present invention, be equal to replacement, change etc., these conversion, all should be within protection scope of the present invention as long as do not deviate from spirit of the present invention.In addition, " embodiment " described in above many places represents different embodiment, can certainly be by its all or part of combination in one embodiment.
Claims (6)
1. a device of measuring the time constant of pyroelectric detector, is characterized in that, comprising:
Laser pulse generating apparatus, described laser pulse generating apparatus produces the laser pulse of preset frequency, and described laser pulse can be irradiated on pyroelectric detector;
Output signal harvester, described output signal harvester is connected to pyroelectric detector, and gathers that described pyroelectric detector responds described laser pulse and the output signal that produces.
2. device as claimed in claim 1, is characterized in that, described laser pulse generating apparatus comprises:
Bias voltage source;
Laser pulse generative circuit, described bias voltage source is connected to described laser pulse generative circuit and is described laser pulse generative circuit power supply;
Pulse generate control circuit, described pulse generate control circuit is connected to described laser pulse generative circuit, and controls the laser pulse that described laser pulse generative circuit produces preset frequency, and described laser pulses irradiate is to pyroelectric detector.
3. device as claimed in claim 2, is characterized in that: described pulse generate control circuit is square wave generation circuit.
4. device as claimed in claim 2, is characterized in that: described laser pulse generative circuit comprises laser diode, the first resistance, the second resistance and triode, wherein:
The positive pole of described laser diode is connected to described bias voltage source and by described the first resistance, is connected to the base stage of described triode;
The negative pole of described laser diode is connected to the collector of described triode by described the second resistance;
The base stage of described triode is connected to described pulse generate control circuit, and emitter is connected to ground.
5. device as claimed in claim 1, is characterized in that, described output signal harvester comprises:
Signal amplification circuit, described signal amplification circuit is connected to described pyroelectric detector, and amplifies the described output signal of described pyroelectric detector;
Signal is processed and display device, and described signal processing and display apparatus processes and show the described output signal of having amplified through described signal amplification circuit obtain the time constant of described pyroelectric detector according to described output signal.
6. device as claimed in claim 5, is characterized in that: described signal is processed and display device is oscillograph.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390709A (en) * | 2014-11-10 | 2015-03-04 | 北方广微科技有限公司 | Pyroelectric infrared reading circuit |
| CN108267799A (en) * | 2017-12-29 | 2018-07-10 | 北京控制工程研究所 | A kind of high-precision infrared detector time constant tests system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390709A (en) * | 2014-11-10 | 2015-03-04 | 北方广微科技有限公司 | Pyroelectric infrared reading circuit |
| CN104390709B (en) * | 2014-11-10 | 2018-05-01 | 北方广微科技有限公司 | Rpyroelectric infrared reading circuit |
| CN108267799A (en) * | 2017-12-29 | 2018-07-10 | 北京控制工程研究所 | A kind of high-precision infrared detector time constant tests system and method |
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Application publication date: 20140409 |