Paper Title:
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.

  Info
Periodical
Chapter
Chapter 3: Sensor, Test and Signal Processing
Edited by
Zhixiang Hou
Pages
446-449
DOI
10.4028/www.scientific.net/AMM.128-129.446
Citation
Y. J. Wang, J. X. Chen, Y. Y. Kang, L. K. Yang, Y. T. Wang, "A Detection Circuit to Faint Signal for Difference Absorption Gas Sensor", Applied Mechanics and Materials, Vols. 128-129, pp. 446-449, 2012
Online since
October 2011
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Price
$32.00
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