期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 71, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2021.3138105
关键词
Absorption; Gas lasers; Temperature sensors; Interference; Filtration; Spectroscopy; Laser modes; Carbon monoxide (CO); cross-interference cancellation; laser absorption spectroscopy; methane (CH4); trace gas sensing
资金
- National Natural Science Foundation of China [61627823, 61775079, 61960206004, 62175087]
- Science and Technology Development Program of Jilin Province, China [20200401059GX]
- Science and Technology Research Project of Department of Education of Jilin Province, China [JJKH20211088KJ]
A new dual-gas sensor system utilizing a single laser has been developed to overcome the complexity and cost issues. By introducing a novel two-step second harmonic algorithm based on polynomial fitting, the cross-interference in the single-laser-based dual-gas sensor has been effectively suppressed. Experimental results demonstrate that the proposed sensor system shows excellent performance in detecting methane and carbon monoxide concentrations.
A simultaneous methane (CH4) and carbon monoxide (CO) dual-gas sensor system for coal mine safety applications is highly desirable and yet challenging, from the perspective of complexity and cost. A single distributed feedback (DFB) laser has been utilized in dual-gas sensor to solve the problems in cost and setup complexity. However, there is dual-gas cross-interference to be addressed in single-laser-based dual-gas sensor. To suppress the interference caused by absorption line overlapping, a novel two-step second harmonic algorithm based on polynomial fittingmethod was proposed for the single DFB laser-based near-infrared dual-gas sensor. A Herriott absorption gas cell was designed with a & x007E;25 m optical path length. Numerical simulations and measurements were carried out to investigate the reported dual-gas cross-interference cancellation method. The signal-to-noise ratio (SNR) with the -PolyFit algorithm was improved by & x007E;53 dB compared to the scheme without the algorithm. The limit of detection (LoD) of CH4 was 0.97 parts per million in volume (ppmv) with a 0.4-s averaging time and it was further decreased to 62 parts per billion in volume (ppbv) with a 224-s averaging time. The CO measurement precision is 0.23 ppmv with a 0.4-s averaging time. With increasing averaging time, a measurement precision of 11 ppbv with a 212-s averaging time was obtained. Field experiments were carried out to evaluate the sensor performance for early fire detection and CH4 gas leakage monitoring. The reported novel -PolyFit algorithm-based dual-gas sensor with no additional requirement on hardware shows enhanced selectivity and antiinterference ability compared to the infrared dual-gas sensor using a traditional sensing architecture with two lasers.
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