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
- Acta Optica Sinica
- Vol. 41, Issue 7, 0712001 (2021)
Fig. 1. Schematic of passive detection of pollution gases
Fig. 2. Structure of detection system
Fig. 3. Periodic change process of measuring optical path
Fig. 4. Signal waveform before and after AC amplifier. (a) Before AC amplifier;(b) after AC filter amplifier
Fig. 5. Experimental device of detection system
Fig. 6. Spectral response curve of each channel and detector
Fig. 7. Phase lock-in value curve of each channel measurement signal. (a) Without phase judgment; (b) adding phase judgment
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 2. Comparison of radiation value of channel 1 before and after correction with theoretical value of model
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