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Proceedings Paper

Online monitoring of industrial flue gases using tunable diode laser with a digital-control module
Author(s): Zhi-rong Zhang; Feng-zhong Dong; Yu Wang; Bian Wu; Tao Pang; Hua Xia; Guo-jie Tu
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Paper Abstract

Increased demands on air quality have created incentives for new methods to monitor gas pollution. In this paper we will present an online gas analyzer for industrial flue pollution monitoring based on tunable diode laser absorption spectroscopy (TDLAS) technology. Signal measurements with a sensitive device inevitably suffer from the predictable or unpredictable sources such as intensity fluctuations and the laser output wavelength dithers. In order to eliminate or at least reduce the measurement uncertainty and gain high reliability, a close-circle digital-control module with functions of digital signal generator, digital lock-in-amplifier (D-LIA), data acquisition and data processing has been developed to substitute the previous independent signal generator board, analog lock-in-amplifier and data acquisition card in our TDLAS system. With the help of the digital-control module and the advanced digital signal processing techniques the performance of the TDLAS system has demonstrated great improvement in long term field tests.

Paper Details

Date Published: 9 November 2010
PDF: 7 pages
Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 785313 (9 November 2010); doi: 10.1117/12.871661
Show Author Affiliations
Zhi-rong Zhang, Anhui Institute of Optics and Fine Mechanics (China)
Feng-zhong Dong, Anhui Institute of Optics and Fine Mechanics (China)
Yu Wang, Anhui Institute of Optics and Fine Mechanics (China)
Bian Wu, Anhui Institute of Optics and Fine Mechanics (China)
Tao Pang, Anhui Institute of Optics and Fine Mechanics (China)
Hua Xia, Anhui Institute of Optics and Fine Mechanics (China)
Guo-jie Tu, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7853:
Advanced Sensor Systems and Applications IV
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan; Lin Zhang, Editor(s)

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