Research on the Synchronous Measurement of CH4 and C2 H6 Trace Gases in Natural Gas Leaks Based on Mid-Infrared Absorption Spectrum
To efficiently detect leaks in urban gas networks,a two-component concentration measurement sensor for CH4and C2 H6 based on a mid-infrared interband cascade laser and a 13-meter long optical range gas cell is designed.The sensor emits a laser of specific wavelength,covering CH4 and C2 H6absorption lines for simultaneous detection,while preventing water vapor interference through gas cell negative pressure.Long-term tests reveal 0.5%and 1.8%relative errors for CH4 and C2 H6.Allan variance analysis shows a mini-mum detection limit of 1.31×10-9 for CH4 at 327 s and 0.02×10-9 for C2 H6 at 402 s integration time,demonstrating excellent stability.Mobile monitoring confirms a strong linear correlation(Pearson coefficient 0.999 133)between CH4 and C2 H6 in natural gas,offering a reliable basis for leakage identification.The proposed technology holds significant value in engineering applications.
methane-ethane two-component gas sensormid-infrared laser absorption spectroscopyPearson correlation coefficientnatural gas leakage
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