| Citation: | YANG Tian-yue, GONG Ting, GUO Gu-qing, SUN Xiao-cong, TIAN Ya-li, QIU Xuan-bing, HE Qiu-sheng, GAO Xiao-ming, LI Chuan-liang. Design and achievement of a device for high-precision ammonia gas detection based on laser spectroscopy[J]. Chinese Optics, 2023, 16(5): 1129-1136. doi: 10.37188/CO.2023-0023
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Ammonia emission will cause harm to the environment and human health, so it is particularly important that the ammonia concentrations are measured with high precision. Off-Axis Integrating Cavity Output Spectroscopy (OA-ICOS), which has the advantages of high sensitivity and high response speed, is used to design a high-precision ammonia detection device. The gas absorption cell is composed of two high reflection mirrors with a reflectivity of 99.99%, and the base length of the optical resonator is 30 cm. Finally, an optical path of nearly 3000 m was realized. The Distributed Feedback Laser (DFB) with a central wavelength of 1528 nm is tuned to 6548.611 cm−1 and 6548.798 cm−1. The concentration of NH3 is changed from 1×10 −5 to 5×10−5 and is detected under an atmospheric pressure of 18.6 kPa at room temperature. The measurement results show that the linear fit
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