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Regular | Open Access

Study of a Distributed Feedback Diode Laser Based Hygrometer Combined Herriot-Gas Cell and Waterless Optical Components

Yubin WEI1,2, Jun CHANG1( ), Jie LIAN1, Qiang WANG1, Wei WEI1
School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan, 250100, China
Laser Research Institute of Shandong Sciences Academy, Jinan, 250014, China
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Abstract

A distributed feedback diode laser (DFB-DL) based hygrometer combined with a long-path-length Herriot gas cell and waterless optical components was proposed and investigated. The main function of this sensor was to simultaneously improve the measurement reliability and resolution. A comparison test between a 10-cm normal transmission-type gas cell and a 3-m Herriot gas cell was carried out to demonstrate the improvement. Reliability improvement was achieved by influence suppression of water vapor inside optical components (WVOC) through combined action of the Herriot gas cell and waterless optical components. The influence of WVOC was suppressed from 726ppmv to 25ppmv using the Herriot gas cell. Moreover, combined with waterless optical components, the influence of WVOC was further suppressed to no more than 4ppmv. Resolution improvement from 11.7ppmv to 0.32ppmv was achieved mainly due to the application of the long-path-length Herriot gas cell. The results show that the proposed sensor has a good performance and considerable potential application in gas sensing, especially when probed gas possibly permeates into optical components.

Keywords

Herriot gas cellhygrometerwavelength modulation spectroscopywaterless optical componentswater vapor inside optical components

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Photonic Sensors
Volume 6 Issue 3,
September 2016
Pages 214-220
DOI: 10.1007/s13320-016-0320-1

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Cite this article:
WEI Y, CHANG J, LIAN J, et al. Study of a Distributed Feedback Diode Laser Based Hygrometer Combined Herriot-Gas Cell and Waterless Optical Components. Photonic Sensors, 2016, 6(3): 214-220. https://doi.org/10.1007/s13320-016-0320-1

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Received: 19 January 2016
Revised: 01 June 2016
Published: 13 August 2016
© The Author(s) 2016.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.