Based on the absorption mechanism of infrared spectrum of ethanol gas, a detection system is designed to detect the concentration of ethanol gas quickly and accurately. Based on the Beer-Lambert law and the absorption rate of ethanol gas in the near-infrared region, the infrared diode with the center wavelength of 1300 nm is selected as the light source, and then the cascaded air chamber is designed, and the light source driving circuit and detecting circuit are designed and made. The results show that the system is simple in structure, stable in performance. The measurement error is within 5.3%, which meets the current demand of ethanol concentration detection in the liquor industry.
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