A Detection Circuit to Faint Signal for Difference Absorption Gas Sensor

Yan Ju Wang; Jia Xing Chen; Yue Yi Kang; Li Kun Yang; Yu Tian Wang

doi:10.4028/www.scientific.net/AMM.128-129.446

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 128-129A Detection Circuit to Faint Signal for Difference...

A Detection Circuit to Faint Signal for Difference Absorption Gas Sensor

Abstract:

ion: In gas difference absorption detecting system, the output electric signal is very faint and submerged in the background noise. In order to extract the faint signal covered by the background noise, we design the detective circuit aiming at how to restrain the noise and improve SNR of the system. In this paper, the detection circuit centering lock-in amplifier which reference signal frequency is automaticly followed is designed. The circuit adopts synchronization cumulating and locked loop technic, carries out frequency and phase aotomatic follow to the measuring signal by a locked loop circuit. The circuit not only avoids the tache taking reference signai from the modulator then adjusting the phase shif, but also improving signal-to-noise ratio more by synchronization cumulation.

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Periodical:

Applied Mechanics and Materials (Volumes 128-129)

Pages:

446-449

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.128-129.446

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Online since:

October 2011

Authors:

Yan Ju Wang, Jia Xing Chen, Yue Yi Kang, Li Kun Yang, Yu Tian Wang

Keywords:

Faint Signal, Locked Loop, Lock-In Amplifier, Signal-to-Noise Ratio (SNR), Synchronization Cumulation

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References

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