Weak Signal Detection System Based on Lock-in Amplifier Technology

Yong Lv; Chun Hui Niu; Yue Qiang Li; Qing Shan Chen; Xiao Ying Li; Zi Ren Zhao

doi:10.4028/www.scientific.net/AMM.389.489

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 389Weak Signal Detection System Based on Lock-in...

Weak Signal Detection System Based on Lock-in Amplifier Technology

Abstract:

In order to detect the weak signal deeply buried in the noise, a weak signal detection system based on lock-in amplifier is proposed. The system includes the preamplifier circuit, active low pass filter circuit, AC amplifying circuit and phase sensitive demodulation circuit. Test results show that it can greatly increase the signal-to-noise ratio (SNR) up to 12.7db.

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Periodical:

Applied Mechanics and Materials (Volume 389)

Pages:

489-493

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.389.489

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Online since:

August 2013

Authors:

Yong Lv, Chun Hui Niu, Yue Qiang Li, Qing Shan Chen, Xiao Ying Li, Zi Ren Zhao

Keywords:

Filter, Lock-In Amplifier, Phase Sensitive Detection, Signal-to-Noise Ratio (SNR), Weak Signal Detection

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