Abstract

Early detection of humans under the influence of alcohol in public places (workplace, public gathering) is particularly important for safety reasons. In this article, the theoretical analysis of stand-off detection of alcohol in the air exhaled by humans as well as experimental results of the developed experimental setup is presented. The concept of differential absorption of two laser beams at different wavelengths was used. The idea of using standard deviation of the relative difference of the amplitudes of two signals to detect the alcohol was applied for the first time. The idea was verified by the experiments and it was shown that a reliable device can be developed that can efficiently detect alcohol concentration in the exhaled air at the level of 0.3 mg/L (0.63‰). Moreover, the concept of such device examining humans entering a specific area was proposed. The results of this article may be useful to scientists or engineers working on alcohol detection in human blood.

Highlights

  • Stand-off detection of vapors and gases utilizing their resonance absorption of electromagnetic radiation is well-known and widely described in literature [1,2,3,4,5,6,7]

  • The application of stand-off detection of alcohol in the air exhaled by humans may solve the problem

  • The concept of the device for stand-off detection of alcohol in the air exhaled by humans entering a specific area was proposed

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Summary

Introduction

Stand-off detection of vapors and gases utilizing their resonance absorption of electromagnetic radiation is well-known and widely described in literature [1,2,3,4,5,6,7]. A particular case of this method is the detection of alcohol in the air exhaled by humans. The blood test is socially regarded as more reliable, both techniques are effective, which can be proved by Henry’s Law saying that in a specific temperature the alcohol vapor pressure above the alcohol solution corresponds to the alcohol concentration in this solution [8]. There are some articles describing stand-off detection of alcohol in moving cars [10,11,12,13], its application to examine humans entering a specific area has not been described so far. The concept of the device for stand-off detection of alcohol in the air exhaled by humans entering a specific area was proposed. The proposed system would not be comparable in cost to existing systems, and is not looking to replace them, but rather, is designed while keeping in mind a very specific application

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