Application of wavelength scanning for measuring water vapour concentration by distributed laser diode

Jun Chang; Lv Guangping; Guoqing Zhou; Kun Chen; Yan Zhang; Zhongliang Wang; Shicong Zhang; Qiang Wang; Fujun Song

doi:10.1117/12.892685

16 September 2011 Application of wavelength scanning for measuring water vapour concentration by distributed laser diode

Jun Chang, Lv Guangping, Guoqing Zhou, Kun Chen, Yan Zhang, Zhongliang Wang, Shicong Zhang, Qiang Wang, Fujun Song

Author Affiliations +

Proceedings Volume 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V; 812004 (2011) https://doi.org/10.1117/12.892685
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

A technique which takes advantage of distributed feedback laser diode (DFB-LD) wavelength scanning to measure water vapor concentration is presented. Concentration is gotten by peak absorption rate according to Beer-Lambert law and absorption coefficient of water vapor in HITRAN database. Theoretical work on the pressure affection to light intensity absorption rate has been done, a scheme is presented to cope with the affection of overlap of two adjacent lines, it takes advantage of the peak absorption difference between 1368.597nm and 1367.862 nm, and the difference value is used to calculate the water-vapor concentration.

Citation Download Citation

Jun Chang, Lv Guangping, Guoqing Zhou, Kun Chen, Yan Zhang, Zhongliang Wang, Shicong Zhang, Qiang Wang, and Fujun Song "Application of wavelength scanning for measuring water vapour concentration by distributed laser diode", Proc. SPIE 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V, 812004 (16 September 2011); https://doi.org/10.1117/12.892685

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