A detection system based on supercontinuum laser absorption spectroscopy(SCLAS)technology was built up in this study.The absorption spectra of CH_(4)in different near-infrared bands were measured based on the SCLAS de...A detection system based on supercontinuum laser absorption spectroscopy(SCLAS)technology was built up in this study.The absorption spectra of CH_(4)in different near-infrared bands were measured based on the SCLAS detection system.Under normal temperature and pressure,the absorption spectra of CH_(4)at different concentrations in the bands of 1319—1339 nm and 1656—1676 nm were measured.The linear models of CH_(4)concentrations in different bands were established.The fitting coefficient(R^(2))of the models were 0.9957 and 0.9961,respectively.In order to improve the concentration inversion ability of the model,the weight distribution of each model was determined by R^(2)and sum of squared error(SSE)to obtain a new combined model.The maximum relative error of the concentration inversion was reduced from 2.3%to 1.3%.The experimental results show the feasibility of applying the SCLAS technology to CH_(4)concentration measurement,and it also verifies that the dual-band combination model can improve the accuracy and stability of the CH_(4)concentration measurement.展开更多
基金supported by the Key Projects of Hebei Natural Science Foundation(No.E2017201142)the 2018 Ministry of Education"Chunhui Program"Cooperative Scientific Research Projects+1 种基金the Postdoctoral Research Projects in Hebei Province(No.B2016003008)the Project Funded by Hebei Province to Introduce Overseas Students in 2021(No.C20210312)
文摘A detection system based on supercontinuum laser absorption spectroscopy(SCLAS)technology was built up in this study.The absorption spectra of CH_(4)in different near-infrared bands were measured based on the SCLAS detection system.Under normal temperature and pressure,the absorption spectra of CH_(4)at different concentrations in the bands of 1319—1339 nm and 1656—1676 nm were measured.The linear models of CH_(4)concentrations in different bands were established.The fitting coefficient(R^(2))of the models were 0.9957 and 0.9961,respectively.In order to improve the concentration inversion ability of the model,the weight distribution of each model was determined by R^(2)and sum of squared error(SSE)to obtain a new combined model.The maximum relative error of the concentration inversion was reduced from 2.3%to 1.3%.The experimental results show the feasibility of applying the SCLAS technology to CH_(4)concentration measurement,and it also verifies that the dual-band combination model can improve the accuracy and stability of the CH_(4)concentration measurement.
