Based on laser energy absorption ratio differential algorithm methane concentration detection system

To reduce the interference of other gases and improve detection accuracy in CH 4 concentration detection, a system is proposed, ratio differential algorithm designed. The difference value absorbed light intensity between chamber 1 2 used to suppress calculation by component gases. high gas 3 obtain accurate position characteristic absorption peak, it applied as boundary condition for data extraction 1. Two sets calculations were used, one set was calculate laser energy at absorption, Then, proportion coefficients two values inversion function using this structure. interfering include C H 6 , SO CO . A total 1,000 sample collected mixed gas, with 400 rest test samples. results show that about times traditional algorithm. modeling time approximately 1/4 methods. It has certain advantages detecting environments