Mid-infrared carbon monoxide detection system using differential absorption spectroscopy technique
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1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;;2. College of Communication Engineering, Jilin University, Changchun 130012, China

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This work has been supported in part by the National Key Technology R&D Program of China (Nos.2013BAK06B04 and 2014BAD08B03), the

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    Abstract:

    A differential carbon monoxide (CO) concentration sensing device using a self-fabricated spherical mirror (e.g. light-collector) and a multi-pass gas-chamber is presented in this paper. Single-source dual-channel detection method is adopted to suppress the interferences from light source, optical path and environmental changes. Detection principle of the device is described, and both the optical part and the electrical part are developed. Experiments are carried out to evaluate the sensing performance on CO concentration. The results indicate that at 1.013×105 Pa and 298 K, the limit of detection (LoD) is about 11.5 mg/m3 with an absorption length of 40 cm. As the gas concentration gets larger than 115 mg/m3 (1.013×105 Pa, 298 K), the relative detection error falls into the range of −1.7%—+1.9%. Based on 12 h long-term measurement on the 115 mg/m3 and 1 150 mg/m3 CO samples, the maximum detection errors are about 0.9% and 5.5%, respectively. Due to the low cost and competitive characteristics, the proposed device shows potential applications in CO detection in the circumstances of coal-mine production and environmental protection.

    Reference
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DONG Ming, SUI Yue, LI Guo-lin, ZHENG Chuan-tao, CHEN Mei-mei, WANG Yi-ding. Mid-infrared carbon monoxide detection system using differential absorption spectroscopy technique[J]. Optoelectronics Letters,2015,11(6):469-472

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  • Received:August 03,2015
  • Online: January 21,2016
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