多参数补偿中红外甲烷检测仪的研制与试验
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摘要
采用双通道差分式红外气体检测方法,基于比尔朗伯理论做针对性修正,研制出低检测下限、高探测性能的手持式红外甲烷气体检测仪.通过TracePro光线模拟软件,对比分析多种光学路径结构,得到小空间内长光程气室结构,增强气体有效吸收,提高仪器检测性能.引入多参数补偿算法,对气体吸收理论进行优化,得到适应本检测系统的气体吸收函数,以保证气体浓度信息计算准确性.仪器工作时最大输出电流为130mA,采用干电池供电,仪器的尺寸为209mm×70mm×40mm,甲烷气体浓度爆炸限以下最低检测限可达到50ppm,可以保证气体防爆的安全性要求.
The dual-channel non-spectroscopic infrared gas detection method is adopted,and the traditional infrared gas absorption theory is modified to develop a handheld infrared methane detector with low detection limit and high detection performance.Through the light simulation software TracePro,a variety of optical path structures were compared to obtain the long-path gas chamber structure in a small space to enhance the effective absorption of gas and improve the detection performance of the instrument.The multi-parameter compensation algorithm is introduced to optimize the Lambert-Beer law,and the gas absorption function adapted to the detection system is obtained to ensure the accuracy of the calculation of gas concentration information.When the instrument works,the maximum output current is130 mA,which is powered by dry battery.The size of the instrument is 209 mm×70 mm×40 mm.The minimum detection limit is below the explosion limit of methane gas concentration reaching to 50 ppm,which can ensure the safety of the gas against explosion.
The dual-channel non-spectroscopic infrared gas detection method is adopted,and the traditional infrared gas absorption theory is modified to develop a handheld infrared methane detector with low detection limit and high detection performance.Through the light simulation software TracePro,a variety of optical path structures were compared to obtain the long-path gas chamber structure in a small space to enhance the effective absorption of gas and improve the detection performance of the instrument.The multi-parameter compensation algorithm is introduced to optimize the Lambert-Beer law,and the gas absorption function adapted to the detection system is obtained to ensure the accuracy of the calculation of gas concentration information.When the instrument works,the maximum output current is130 mA,which is powered by dry battery.The size of the instrument is 209 mm×70 mm×40 mm.The minimum detection limit is below the explosion limit of methane gas concentration reaching to 50 ppm,which can ensure the safety of the gas against explosion.
引文
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[4] TAN S,LIU W,WANG L,et al.Mid-infrared distributed-feedback quantum cascade laser-based photoacoustic detection of trace methane gas[J].Spectroscopy and Spectral Analysis,2012,32(5):1251-1254.
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[6] ZHA Shen-long,LIU Kun,TAN Tu,et al.Application of photoacoustic spectroscopy in multi-component gas concentration detection[J].Acta Photonica Sinica,2017,46(6):0612002.查申龙,刘锟,谈图,等.光声光谱技术在多组分气体浓度探测中的应用[J].光子学报,2017,46(6):0612002.
[7] YU X,LV R,SONG F,et al.Pocket-sized nondispersive infrared methane detection device using two-parameter temperature compensation[J].Spectroscopy Letters,2014,47(1):30-37.
[8] SCHARF T,BRIAND D,BULER S,et al.Miniaturized Fourier transform spectrometer for gas detection in the MIR region[J].Sensors and Actuators B,2010,147(1):116-121.
[9] PARK J,YI S.Temperature compensated NDIR CH4 gas sensor with focused beam structure[J].Procedia Engineering,2010,5(1):1248-1251.
[10] DENZER W,HANCOCK G,ISLAM M,et al.Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy:initial studies on potential breath analytes[J].Analyst,2011,136(4):801-806.
[11] ZHU Z,XU Y,JIANG B.A one ppm NDIR methane gas sensor with single frequency filter denoising algorithm[J].Sensors,2012,12(9):12729-12740.
[12] LI L,CAO F,WANG Y,et al.Design and characteristics of quantum cascade laser-based CO detection system[J].Sensors and Actuators B,2009,142(1):33-38.
[13] YE W,ZHENG C,YU X,et al.Design and performances of a mid-infrared CH4detection device with novel threechannel-based LS-FTF self-adaptive denoising structure[J].Sensors and Actuators B,2011,155(1):37-45.
[14] ZHANG Y,GAO W,SONG Z,et al.Design of a novel gas sensor structure based on mid-infrared absorption spectrum[J].Sensors and Actuators B,2010,147(1):5-9.
[15] ZHENG C,YE W,LI G,et al.Performance enhancement of a mid-infrared CH4detection sensor by optimizing an asymmetric ellipsoid gas-cell and reducing voltage-uctuation:Theory,design and experiment[J].Sensors and Actuators B,2011,160(1):389-398.
[16] DONG M,ZHENG C,MIAO S,et al.Development and measurements of a mid-infrared multi-gas sensor system for CO,CO2and CH4detection[J].Sensors,2017,17(10):2221-2222.
[17] ZHENG C,YE W,SANCHEZ N,et al.Infrared dual-gas CH4/C2H6sensor using two continuous-wave interband cascade lasers[J].IEEE Photonics Technology Letters,2016,28(21):2351-2354.
[18] DONG L,LI C,SANCHEZ N,et al.Compact CH4 sensor system based on a continuous-wave,low power consumption,room temperature interband cascade laser[J].Applied Physics Letters,2016,108(1):0111063.