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Fiber-ring laser-based intracavity photoacoustic spectroscopy for trace gas sensing

机译:基于纤维环激光的腔内光声光谱检查痕量气体传感

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摘要

We demonstrated a novel trace gas sensing method based on fiber-ring laser intracavity photoacoustic spectroscopy. This spectroscopic technique is a merging of photoacoustic spectroscopy (PAS) with a fiber-ring cavity for sensitive and all-fiber gas detection. A transmission-type PAS gas cell (resonant frequency f(0) = 2.68 kHz) was placed inside the fiber-ring laser to fully utilize the intracavity laser power. The PAS signal was excited by modulating the laser wavelength at f 0/ 2 using a custom-made fiber Bragg grating-based modulator. We used this spectroscopic technique to detect acetylene (C2H2) at 1531.6 nm as a proof of principle. With a low Q-factor (4.9) of the PAS cell, our sensor achieved a good linear response (R-2 = 0.996) to C2H2 concentration and a minimum detection limit of 390 ppbv at 2-s response time. (C) 2017 Optical Society of America
机译:我们证明了一种基于纤维环激光腔内光声光谱谱的新型痕量气体传感方法。 这种光谱技术是光声光谱(PAS)的合并,其具有纤维环腔,用于敏感和全纤维气体检测。 将透射型PAS燃气电池(谐振频率f(0)= 2.68kHz)放置在光纤激光器内,以充分利用腔内激光功率。 通过使用定制的光纤布拉格光栅的调节剂调制F 0/2的激光波长来激发PAS信号。 我们利用这种光谱技术在1531.6nm处检测乙炔(C2H2)作为原理的证据。 对于PAS细胞的低Q系数(4.9),我们的传感器在2-S响应时间达到C 2 H 2浓度(R-2 = 0.996)至C2H2浓度,最小检测限为390ppbv。 (c)2017年光学学会

著录项

  • 来源
    《Optics Letters》 |2017年第11期|共4页
  • 作者单位

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Hong Kong Hong Kong Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Hong Kong Hong Kong Peoples R China;

    Shandong Univ Sch Informat Sci &

    Engn Jinan 250100 Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Hong Kong Hong Kong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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