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Proceedings Paper

Measurement methods in trace water vapor concentration detection system based on direct absorption spectroscopy
Author(s): G. P. Lv; J. Chang; S. S. Zhang; Q. P. Wang; Y. N. Liu; Z. Liu; Q. Wang; W. J. Wang; Z. L. Wang; S. Jiang; C. G. Zhu; W. Wei
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Paper Abstract

In trace water vapor direct absorption spectroscopy, the absorption signal is buried in noise and up and downs of the light intensity, an effective signal extraction method is vital. In the basis of double-beam differential absorption, division method in voltage and an approach based on balanced ratiometer detection (BRD) were studied. Voltage division has an excellent stability to temperature variation, mechanical extrusion and fiber bend loss. As to the BRD method, it has an outstanding self-adjusting capability and it can also avoid an excess phase difference caused by current-to-voltage converting circuit, thus this method has a high sensitivity. Furthermore, a so called dual-peak method based on the differential value of two adjacent absorption lines is introduced, the differential value proved has a linear relation with water vapor concentration, and this method provides a way to measure the concentration at high pressure. In addition, the influence of water vapor inside the optical components has been discussed.

Paper Details

Date Published: 15 October 2013
PDF: 4 pages
Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 892421 (15 October 2013); doi: 10.1117/12.2031728
Show Author Affiliations
G. P. Lv, Shandong Univ. (China)
J. Chang, Shandong Univ. (China)
S. S. Zhang, Shandong Univ. (China)
Q. P. Wang, Shandong Univ. (China)
Y. N. Liu, Shandong Academy of Sciences (China)
Z. Liu, Shandong Univ. (China)
Q. Wang, Shandong Univ. (China)
W. J. Wang, Shandong Univ. (China)
Z. L. Wang, Shandong Univ. (China)
S. Jiang, Shandong Univ. (China)
C. G. Zhu, Shandong Univ. (China)
W. Wei, Shandong Univ. (China)

Published in SPIE Proceedings Vol. 8924:
Fourth Asia Pacific Optical Sensors Conference
Minghong Yang; Dongning Wang; Yun-Jiang Rao, Editor(s)

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