Design of methanol gas concentration detection system
In response to the problem that existing methanol gas detection methods cannot meet the rapidly growing de-mand for rapid detection in the fuel cell market,a detection system design and quantitative analysis were conducted fo-cusing on methanol gas.Firstly,the light source was selected based on the infrared absorption characteristics of meth-anol gas,and its driving circuit was designed.The gas modulates the light source.Secondly,an orthogonal lock-in am-plification system was designed using wavelet decomposition and lock-in amplification techniques.The lock-in ampli-fication output signal was further processed using wavelet decomposition,achieving a detection limit of 9 ppm and a re-sponse time of approximately 2 s,enabling the detection of weak signals.Lastly,an analysis model was established based on linear regression with a signal determination coefficient of 0.979.Experimental results demonstrate that the designed methanol detection system has accurate predictive capabilities and high sensitivity,enabling rapid and quan-titative detection of methanol.
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