基于量子级联激光器光腔衰荡光谱技术的痕量氨气检测

采用基于红外脉冲量子级联激光器的高灵敏光腔衰荡光谱（Cavity ring-down spectroscopy）技术建立了氨气在1027cm^-1（9．7μm）附近的吸收光谱痕量检测实验装置．使用该装置对人体口腔呼出气体以及超净实验室环境中氨气成份进行了测量和分析，氨气的检测灵敏度达到10ppb．模拟分析了激光器光谱线宽对测量结果和系统检测灵敏度的影响，随着激光器光谱线宽的增加，测量结果偏低，系统检测灵敏度下降．为了减小光源线宽对测量结果的影响，通过修正曲线对测量数据进行修正，得到了较好的结果．...

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Bibliographic Details
Published in红外与毫米波学报 Vol. 31; no. 5; pp. 431 - 436
Main Author 曲哲超 李斌成 韩艳玲
Format Journal Article
LanguageChinese
Published 中国科学院光电技术研究所,四川成都610209 2012
中国科学院研究生院,北京100039%中国科学院光电技术研究所,四川成都,610209
Subjects
光腔衰荡光谱
氨气
线宽
量子级联激光器
氨气
线宽
光腔衰荡光谱
量子级联激光器
Online AccessGet full text
ISSN1001-9014
DOI10.3724/SP.J.1010.2012.00431

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Summary:采用基于红外脉冲量子级联激光器的高灵敏光腔衰荡光谱（Cavity ring-down spectroscopy）技术建立了氨气在1027cm^-1（9．7μm）附近的吸收光谱痕量检测实验装置．使用该装置对人体口腔呼出气体以及超净实验室环境中氨气成份进行了测量和分析，氨气的检测灵敏度达到10ppb．模拟分析了激光器光谱线宽对测量结果和系统检测灵敏度的影响，随着激光器光谱线宽的增加，测量结果偏低，系统检测灵敏度下降．为了减小光源线宽对测量结果的影响，通过修正曲线对测量数据进行修正，得到了较好的结果．
Bibliography:QU Zhe-Chao, LI Bin-Cheng, HAN Yan-Ling （ 1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China; 2. Graduate University of the Chinese Academy of Sciences,Beijing 100039 ,China）
A cavity ring-down spectroscopy apparatus employing a pulsed quantum cascade laser operating near 1027 cm^-1 （9.7 μm） is investigated for trace ammonia detection. The trace ammonia in human breath and clean room atmosphere are measured and analyzed. A sensitivity of 10 ppb has been demonstrated for ammonia detection. The effects of the spectral line-width on the measurement accuracy and sensitivity of the system are analyzed. The measurement accuracy and sensitivity of the apparatus decrease with the increasing laser spectral line-width. The measurement results can be corrected by taking into account of the line-width effect in data analysis.
31-1577/TN
cavity ring-down spectroscopy; quantum cascade laser; ammonia; line-width
ISSN:1001-9014
DOI:10.3724/SP.J.1010.2012.00431