Detection of chemical warfare agents based on quantum cascade laser cavity ring-down spectroscopy |
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| Authors: | Zhechao Qu Chunming Gao Yanling Han Xiaosong Du and Bincheng Li |
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| Institution: | 1 Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3School of Optoelectronic Information,University of Electronic Science and Technology of China,Chengdu 610054,China |
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| Abstract: | Chemical warfare agents(CWAs) are recognized as serious threats of terrorist acts against the civilian population.Minimizing the impact of these threats requires early detection of the presence of CWAs.Cavity ring-down spectroscopy(CRDS) is an exquisitely sensitive technique for the detection of trace gaseous species.In this letter,the CRDS technique is employed using a pulsed quantum cascade laser for the detection of dimethyl methylphosphonate(DMMP).A limit of DMMP detection of approximately 77 ppb is achieved.The best achievable sensitivity that corresponds to noise-equivalent absorption is approximately 2×10-7cm-1. |
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