Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5488633 | Infrared Physics & Technology | 2017 | 7 Pages |
Abstract
A mid-infrared carbon monoxide (CO) sensor system based on a dual-channel differential detection method was developed using a broadband light source in the 4.60 µm wavelength region and a single-reflection spherical optical chamber with â¼0.373 m absorption path length. CO detection was realized by targeting the wideband strong absorption lines within 4.55-4.65 µm. A dual-channel pyroelectric detector as well as a self-developed digital signal processor (DSP) based orthogonal lock-in amplifier was employed to process CO sensing signal. A minimum detection limit of â¼0.5 ppm in volume (ppmv) was achieved with a measurement time of 6 s, based on an Allan deviation analysis of the sensor system. The response time (1000 â 0 ppmv) was determined to be â¼7 s for the CO sensor operation. Due to the characteristics of low detection limit, fast response time and high cost performance, the proposed sensor has relatively good prospect in coal-mining operation.
Related Topics
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Authors
Ming Dong, Chuantao Zheng, Shuzhuo Miao, Fang Song, Yiding Wang,