Virtual digital lock-in amplifier for SO2 photoacoustic spectroscopic detection

Wei Liu; Minjiang Chen; Pengbo Chen; Shukai He; Da Chen; Zhixin Xu; Yingzhe Cheng; Dongyue Chu; Shen Tian; Kaijun Mu; Lei Li

doi:10.1117/12.3015098

29 December 2023 Virtual digital lock-in amplifier for SO₂ photoacoustic spectroscopic detection

Wei Liu, Minjiang Chen, Pengbo Chen, Shukai He, Da Chen, Zhixin Xu, Yingzhe Cheng, Dongyue Chu, Shen Tian, Kaijun Mu, Lei Li

Author Affiliations +

Proceedings Volume 12975, 6th Optics Young Scientist Summit (OYSS 2023); 129750C (2023) https://doi.org/10.1117/12.3015098
Event: 6th Optics Young Scientist Summit, 2023, Changsha, China

Abstract

Lock-in amplifier (LIA) plays a crucial role in the field of photoacoustic trace gas detection. In this paper, we introduce an innovative concept termed the virtual digital Lock-in Amplifier (VDLIA) using matched filtering techniques. The VDLIA exhibits exceptional proficiency in accurately determining both the amplitude and phase of sinusoidal signals, even in the presence of heightened levels of noise. Pivotal factors influencing the VDLIA’s performance, including the characteristics of the low-pass filter, and the resolution of the analog-to-digital converter (ADC), were examined under diverse noise conditions. To evaluate the effectiveness of the VDLIA, it was integrated into a photoacoustic system designed for the detection of SO₂ concentration. Experimental results demonstrate that the output results of the proposed VDLIA closely align with those generated by a commercial LIA, offering significant potential for various industrial applications.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wei Liu, Minjiang Chen, Pengbo Chen, Shukai He, Da Chen, Zhixin Xu, Yingzhe Cheng, Dongyue Chu, Shen Tian, Kaijun Mu, and Lei Li "Virtual digital lock-in amplifier for SO₂ photoacoustic spectroscopic detection", Proc. SPIE 12975, 6th Optics Young Scientist Summit (OYSS 2023), 129750C (29 December 2023); https://doi.org/10.1117/12.3015098

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