Research on Passive Infrared Signal Processing Method Based on Lock-in Amplifier

Yunyun Wang; Yanli Qiao; Yangyu Li; Tengxiao Guo; Fangxiao Cui; Jun Wu; Dacheng Li

doi:10.3788/AOS202141.0712001

Acta Optica Sinica, Volume. 41, Issue 7, 0712001(2021)

Research on Passive Infrared Signal Processing Method Based on Lock-in Amplifier

Yunyun Wang^1,2, Yanli Qiao², Yangyu Li^2、**, Tengxiao Guo^3、*, Fangxiao Cui², Jun Wu², and Dacheng Li²

¹College of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei, Anhui 230026, China

²Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China

³State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China

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Figures & Tables(10)

Fig. 1. Schematic of passive detection of pollution gases

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Fig. 2. Structure of detection system

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Fig. 3. Periodic change process of measuring optical path

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Fig. 4. Signal waveform before and after AC amplifier. (a) Before AC amplifier;(b) after AC filter amplifier

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Fig. 5. Experimental device of detection system

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Fig. 6. Spectral response curve of each channel and detector

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Fig. 7. Phase lock-in value curve of each channel measurement signal. (a) Without phase judgment; (b) adding phase judgment

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Fig. 8. Radiance curve of blackbody and corresponding radiation values of each channel in different target radiation scenarios. (a) Without phase judgment; (b) adding phase judgment

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Table 1. Parameters of experimental device
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Table 1. Parameters of experimental device
Item Parameter
Detector Photoconductive HgCdTe
Chopper Frequency f=100 Hz
Filter 1 λ_c=7850 nm, w=185 nm
Filter 2 λ_c=9662 nm, w=200 nm
Filter 3 λ_c=10350 nm, w=200 nm
Filter 3 λ_c=11300 nm, w=240 nm

Table 2. Comparison of radiation value of channel 1 before and after correction with theoretical value of model

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Table 2. Comparison of radiation value of channel 1 before and after correction with theoretical value of model

Blackbody temperature /℃	Radiation of channel 1 /(W·m^-2·sr^-1·μm^-1)
Blackbody temperature /℃	Before correction	After correction	Theoretical value
5	10.077	5.539	5.559
10	9.348	6.205	6.241
15	8.540	6.971	6.980
20	7.791	7.705	7.774
25	8.608	8.608	8.631
30	9.518	9.518	9.547
35	10.493	10.493	10.530

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Yunyun Wang, Yanli Qiao, Yangyu Li, Tengxiao Guo, Fangxiao Cui, Jun Wu, Dacheng Li. Research on Passive Infrared Signal Processing Method Based on Lock-in Amplifier[J]. Acta Optica Sinica, 2021, 41(7): 0712001

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