Abstract
We demonstrate a method based on an ICL with tunable wavelength covering ethanol absorption peak, water absorption peak and a reference point around 3.345um to make a stand-off detection of ethanol vapor in the space. The detection model is established using the ratios of reference signal and detection signal at three target wavelengths, which help to eliminate the influence of laser power and the cross interference from water vapor in the space. The intrinsic error caused by detectors and optical elements have been corrected, and availability of this approach has been proved both in theory and in experiment.
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