Intracavity multigas detection based on multiband fiber ring laser

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• 作者：Lin Yu^a ; ^bAuthor Vitae ; Tiegen Liu^a ; ^bAuthor Vitae ; Kun Liu^a ; ^b ; ^{beiyangkl@tju.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Junfeng Jiang^a ; ^bAuthor Vitae ; Tao Wang^a ; ^bAuthor Vitae
• 关键词：Optical gas sensor ; Intracavity absorption spectroscopy ; Fiber ring laser ; Wavelength division multiplexing
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：226
• 期：Complete
• 页码：170-175
• 全文大小：1431 K

文摘

We present a new method for multigas detection based on multiband fiber ring laser. Wavelength division multiplexing is used to realize multiband laser operation. Laser intracavity absorption spectroscopy combined with wavelength modulation technique is used to improve the measurement sensitivity. The second harmonic signal is extracted by the software-based lock-in algorithm for gas concentration retrieval. The relationship between the harmonic amplitudes and gas concentrations is investigated under both weak absorption and strong absorption to improve the accuracy of concentration retrieval. When the system is applied to detect the mixed gases of acetylene, carbon monoxide and carbon dioxide in C + L band, the minimum detectable concentrations are 0.6 ppm, 17.4 ppm and 19.2 ppm respectively.