Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Smartphone Screen Integrated Optical Breathalyzer

Version 1 : Received: 16 April 2021 / Approved: 19 April 2021 / Online: 19 April 2021 (15:11:03 CEST)

How to cite: Lapointe, J.; Bécotte-Boutin, H.; Gagnon, S.; Levasseur, S.; Labranche, P.; D’Auteuil, M.; Abdellatif, M.; Li, M.; Vallée, R. Smartphone Screen Integrated Optical Breathalyzer. Preprints 2021, 2021040502 (doi: 10.20944/preprints202104.0502.v1). Lapointe, J.; Bécotte-Boutin, H.; Gagnon, S.; Levasseur, S.; Labranche, P.; D’Auteuil, M.; Abdellatif, M.; Li, M.; Vallée, R. Smartphone Screen Integrated Optical Breathalyzer. Preprints 2021, 2021040502 (doi: 10.20944/preprints202104.0502.v1).

Abstract

One third of fatal car accidents and so much tragedies are due to alcohol abuse. These sad numbers could be mitigated if everyone had access to a breathalyzer anytime and anywhere. Having a breathalyzer built into a phone or a wearable could be the way to get around the reluctance to carry a separate device. Towards this goal, we propose an inexpensive breathalyzer that could be integrated in the screen of mobile devices. Our technology is based on the evaporation rate of the fog produced by the breath on the phone screen, which increases as a function of the breath alcohol content. The device simply uses a photodiode placed on the side of the screen to measure the signature of the scattered light intensity from the phone display that is guided through the stress layer of the Gorilla glass screen. A part of the display light is coupled to the stress layer via the evanescent field induced at the edge of the breath microdroplets. We demonstrate that the intensity signature measured at the detector can be linked to the blood alcohol content. We fabricated a prototype in a smartphone case powered by the phone’s battery, controlled by an application software installed in the smartphone and tested it in real-world environments. Limitations and future work toward a fully operational device are discussed.

Subject Areas

breathalyzer; wearable; sensors; breath analysis device; health; mobile screen; alcohol; ethanol; smartphone; multimedia screen

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