Abstract
This study concerns remote detection of alcohol vapors in cabins of moving vehicles. By means of a simplified description of propagation of two combined laser beams differently absorbed in alcohol vapors and in vehicle windowpanes, difficulties in detecting alcohol vapors in vehicle cabins using classical differential absorption method are demonstrated. Unreported in the literature, this method of remote detection of alcohol vapors in the air exhaled by a driver or a passenger in moving vehicles is proposed. The method uses two combined laser beams that illuminate different zones in the car cabin through the same windowpane. Based on the correlation between the spread of the transmission of these zones and the alcohol concentration in the air exhaled by a drunken person, it is possible to determine if the alcohol exists in the exhaled air. The effectiveness of the presented method is confirmed experimentally.
Highlights
The ability to remotely detect alcohol vapors in moving cars is important to institutions responsible for traffic safety
The idea of remote detection of alcohol vapors is a special case of remote detection of vapors and gases with the help of the monochromatic radiation absorbed in these vapors
For better understanding of problems related to the remote detection of alcohol vapors in vehicle cabins, an analysis of the physical phenomena occurring during illuminating these cabins by laser beams was carried out
Summary
The ability to remotely detect alcohol vapors in moving cars is important to institutions responsible for traffic safety. Such detection would enable one to stop only suspected vehicles. The idea of remote detection of alcohol vapors is a special case of remote detection of vapors and gases with the help of the monochromatic radiation absorbed in these vapors. 6–8, whereas remote detection of alcohol vapors in moving vehicles is described in Refs. A method of remote detection of alcohol vapors in moving vehicles that solves the presented problem was proposed
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