Exhaust gas monitoring based on absorption spectroscopy in the process industry

Shuai Zhang; Wen-qing Liu; Yu-jun Zhang; Xiao-wen Shu; Rui-feng Kan; Yi-ben Cui; Ying He; Zhen-yu Xu; Hui Geng; Jian-guo Liu

doi:10.1117/12.831320

28 August 2009 Exhaust gas monitoring based on absorption spectroscopy in the process industry

Shuai Zhang, Wen-qing Liu, Yu-jun Zhang, Xiao-wen Shu, Rui-feng Kan, Yi-ben Cui, Ying He, Zhen-yu Xu, Hui Geng, Jian-guo Liu

Author Affiliations +

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 738227 (2009) https://doi.org/10.1117/12.831320
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

This non-invasive gas monitor for exhaust gas monitoring must has high reliability and requires little maintenance. Monitor for in-situ measurements using tunable diode laser absorption spectroscopy (TDLAS) in the near infrared, can meet these requirements. TDLAS has evolved over the past decade from a laboratory especially to an accepted, robust and reliable technology for trace gas sensing. With the features of tunability and narrow linewidth of the distributed feedback (DFB) diode laser and by precisely tuning the laser output wavelength to a single isolated absorption line of the gas, TDLAS technique can be utilized to measure gas concentration with high sensitivity. Typical applications for monitoring of H₂S, NH₃, HC1 and HF are described here together by wavelength modulation spectroscopy with second-harmonic(WMS-2F) detection. This paper will illustrate the problems related to on-line applications, in particular, the overfall effects, automatic light intensity correction, temperature correction, which impacted on absorption coefficient and give details of how effect of automatic correction is necessary. The system mainly includes optics and electronics, optical system mainly composed of fiber, fiber coupler and beam expander, the electron part has been placed in safe analysis room not together with the optical part. Laser merely passes through one-meter-long pipes by the fiber coupling technology, so the system itself has anti-explosion. The results of the system are also presented in the end, the system's response time is only 0.5s, and can be achieved below 1×10⁻⁵ the detection limit at the volume fraction, it can entirely replace the traditional methods of detection exhaust gas in the process industry.

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Shuai Zhang, Wen-qing Liu, Yu-jun Zhang, Xiao-wen Shu, Rui-feng Kan, Yi-ben Cui, Ying He, Zhen-yu Xu, Hui Geng, and Jian-guo Liu "Exhaust gas monitoring based on absorption spectroscopy in the process industry", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738227 (28 August 2009); https://doi.org/10.1117/12.831320

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KEYWORDS

Absorption

Semiconductor lasers

Absorption spectroscopy

Modulation

Fiber couplers

Signal detection

Signal processing

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