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Proceedings of 2009 International Workshop on Information Security and Application (IWISA 2009)

Qingdao, China, November 21-22, 2009

Editors: Feng Gao and Xijun Zhu

AP Catalog Number: AP-PROC-CS-09CN004

ISBN: 978-952-5726-06-0

Page(s): 177-180

A Novel Optical Fiber Gas Sensor for On-line Measurement of Carbon Monoxide

Jin Liu, Yan Yue, and Haima Yang

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Based on analysis of the near infrared spectral absorption of carbon monoxide, a system using absorption type optical fiber for high sensitivity carbon monoxide detection with DFB LD is demonstrated. Light source modulation harmonic measurement is presented in this paper. In order to eliminate the noise, the ratio of the fundamental and second-harmonic signal is used. The mathematical model of gas concentration harmonic measurement is built up and the system is designed.

Index Terms

near infrared spectral absorption, carbon monoxide, modulation, harmonic measurement

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