Patent ID: 9068885
Filing Date: 2015-06-30
Classification: G01J,G01N

Abstract:
1. A method for remote detection of alcohol vapor in the atmosphere, useful for determination of a concentration of ethanol vapor in air exhaled by humans, comprising generating from a laser light source a beam of laser light with a wavelength corresponding to the absorption spectrum of alcohol in a wavelength range of 3.28-3.52 μm, or in one or several wavelength ranges of 6.49-7.46 μm, 7.74-8.33 μm, 8.84-10.10 μm, and 10.7-12.00 μm, sending the laser light beam outside of a device in which the laser light source is housed and across a measurement space outside and separate from the device, the laser light beam being received by a detector, subsequently measuring a light intensity of the laser light after the beam has passed through the measurement space and has been received by the detector, and subsequently, based on spectral analysis of the dependence of the measured light intensity on an alcohol level, determining a concentration of alcohol vapor in the measurement space.