Experiment study on new technology of methane content measurement by dual difference
Abstract：In view of the problem that the environment in local mine is complex, which makes it difficult to extract weak methane gas signal, a new methane detection technology based on dual difference was proposed according to the principle of infrared absorption spectrum. The detection technology adopted two wavelength-two path differential detec- ting structure and got light born voltage by a kind of monochromatic light＇ s twice difference passing the detector with different wavelength. Then it got outputs by AD7794 chip achieving two light signals＇ division. Finally the concentra- tion back-in-deuced formula was obtained through the measurement of variable concentrations of the methane gas in- jected into a new kind of gas chamber with different length which was designed by Ring-down cavity. The experimental results show that adopting dual difference can extract weak methane gas signal more effectively, and solve the perturba- tion problem of light path, and get higher precision and accuracy with error equal to 1%
Keywords：dual difference detectingmethane contentspectrum absorptionRing-down cavity
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1161-1164 )