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Proceedings Paper

Application of digital quadrature lock-in amplifier in TDLAS humidity detection
Author(s): Keke Zhang; Lijuan Zhang; Qiang Zhao; Shixuan Liu; Shizhe Chen; Yushang Wu; Kai Wang; Xianglong Yang
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Paper Abstract

The linearity and the stain resistance of existing humidity sensor is poor, which exists the problems such as low resolution at low temperatures, low faded wet in high humidity environment, large measurement error and long response time. Tunable diode laser absorption spectroscopy technology is studied to measure the environmental humidity, and digital quadrature lock-in amplifiers are used to extract the first harmonic signal and the second harmonic signal, which can eliminate the influence of the phase delay angle and can improve the detection accuracy of the system. Comparative experiment between TDLAS humidity sensor and R.M.YOUNG humidity sensor was completed in the lab, experimental results show that the consistency of the humidity data is very good, which can proves the validity of the TDLAS humidity measurement technology.

Paper Details

Date Published: 24 October 2017
PDF: 8 pages
Proc. SPIE 10461, AOPC 2017: Optical Spectroscopy and Imaging, 1046109 (24 October 2017);
Show Author Affiliations
Keke Zhang, Shandong Academy of Sciences (China)
Lijuan Zhang, Institute of Scientific and Technical Information of China (China)
Qiang Zhao, Shandong Academy of Sciences (China)
Shixuan Liu, Shandong Academy of Sciences (China)
Shizhe Chen, Shandong Academy of Sciences (China)
Yushang Wu, Shandong Academy of Sciences (China)
Kai Wang, Shandong Academy of Sciences (China)
Xianglong Yang, Shandong Academy of Sciences (China)

Published in SPIE Proceedings Vol. 10461:
AOPC 2017: Optical Spectroscopy and Imaging
Jin Yu; Zhe Wang; Wei Hang; Bing Zhao; Xiandeng Hou; Mengxia Xie; Tsutomu Shimura, Editor(s)

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