Paper Info
Title
Simultaneous CH4/CO Measurement at Atmospheric Pressure Using a Single 2.3 m Laser and a Dual-Gas Cross-Interference Cancellation Algorithm
Abstract
A simultaneous methane (CH<sub>4</sub>) 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 CH<sub>4</sub> 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 CH<sub>4</sub> 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.
Year
DOI
Venue
2022
10.1109/TIM.2021.3138105
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Keywords
DocType
Volume
Absorption, Gas lasers, Temperature sensors, Interference, Filtration, Spectroscopy, Laser modes, Carbon monoxide (CO), cross-interference cancellation, laser absorption spectroscopy, methane (CH4), trace gas sensing
Journal
71
ISSN
Citations 
PageRank 
0018-9456
0
0.34
References 
Authors
0
9
Name
Order
Citations
PageRank
Di Yu100.34
Fang Song200.34
Chuantao Zheng300.68
Lien Hu400.34
Yanming Ma500.34
Kaiyuan Zheng600.68
Yu Zhang700.34
Yiding Wang800.34
Frank K. Tittel900.34