Multicomponent gas detection based on concise CW-cavity ring-down spectroscopy with a bow-tie design

Wang Jinduo; Yu Jin; Mo Zeqiang; He Jianguo; Dai Shoujun; Meng Jingjing; Liu Yang; Zhang Xue; Yi Hong

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Multicomponent gas detection based on concise CW-cavity ring-down spectroscopy with a bow-tie design

机译：基于简明CW腔折断光谱与弓形式设计的多组分气体检测

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Concise open-path continuous-wave cavity ring-down spectroscopy (CW-CRDS) with a bow-tie cavity structure is demonstrated in the single- and dual-optical-path experiments for multicomponent gas detection, e.g., greenhouse gas concentration evaluation in ambient air. Owing to its features of optical feedback suppression and small free spectral range (FSR), the bow-tie configuration shows its special advantages in the realization of both a compact arrangement and two counter-propagating non-interference optical paths. The minimum of the Allan deviation reaches 1.6 x 10(-10) cm(-1) for an integration time of 100 s, corresponding to the noise equivalent absorption coefficient of 1.6 x 10(-9) cm(-1) Hz(-1/ 2). The detection sensitivity of methane is deduced to be 0.9 ppbv with its absorption cross section of 1.48 x 10(-20) cm(2)/molecule in the 512 decays averaging mode. A wavelength-correction method is proposed to reduce by about 30% the uncertainty in the measurements caused by the deviation in the wavelength resonance between incident laser and ring-down cavity. The concentrations of greenhouse gases in ambient air are measured by the open-path CW-CRDS with the uncertainties of 0.02, 100, and 10 ppmv for CH4, H2O, and CO2, respectively. (C) 2019 Optical Society of America

机译：简洁的开放式连续波腔横向光谱光谱光谱（CW-CRD）在用于多组分气体检测的单一和双光路实验中，例如环境温室气体浓度评估空气。由于其光学反馈抑制和小自由谱范围（FSR）的特征，船首系扎配置在实现紧凑的布置和两个反传播的非干扰光路上显示了其特殊优点。 Allan偏差的最小值达到1.6×10（ - 10 )cm（-1），用于100 s的积分时间，对应于1.6×10（-9）cm（-1）Hz的噪声等效吸收系数（ - 1/2）。甲烷的检测敏感性被推导为0.9ppbv，其吸收横截面为1.48×10（2 )cm（2）/分子中的512衰变平均模式。提出了一种波长校正方法，以减少由入射光激光和翻转腔之间的波长谐振的偏差引起的测量中的不确定性的减少约30％。环境空气中的温室气体的浓度分别由开口路径CW-CRD测量，分别具有0.02,100和10ppmV的不确定性，分别用于CH 4，H 2 O和CO 2。（c）2019年光学学会

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来源
《Applied optics》 |2019年第11期|共9页
作者
Wang Jinduo; Yu Jin; Mo Zeqiang; He Jianguo; Dai Shoujun; Meng Jingjing; Liu Yang; Zhang Xue; Yi Hong;
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Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

Chinese Acad Sci Acad Optoelect Beijing 100094 Peoples R China;

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Multicomponent gas detection based on concise CW-cavity ring-down spectroscopy with a bow-tie design

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