Abstract

This paper presents the effects of infrared energies on dual elliptical nondispersive infrared (NDIR) ethanol gas sensors for preventing drunken drivers and the advantages of using dual ethanol detectors for temperature compensation algorithm. In order to achieve long-term reliability according to the aging of infrared source, two ethanol detectors are placed at the two foci of ellipsoids and the averaged voltage ratios of two ethanol detectors are used to establish the compensation methods.

Highlights

  • IntroductionThe nondispersive infrared (NDIR) ethanol gas sensor and Near-IR ethanol detecting system are currently researching and developing as promising candidates for driver alcohol detection system for safety (DADSS) [1]

  • The nondispersive infrared (NDIR) ethanol gas sensor and Near-IR ethanol detecting system are currently researching and developing as promising candidates for driver alcohol detection system for safety (DADSS) [1].Among the alternatives, the former was recognized as a more competitive one than the latter because of the size, the cost and compatibility to the electrochemical sensor type which is currently using in automotive and industrial areas as a screening device

  • Even though the initial output voltages at zero ethanol concentration were dependent on the structures, the output voltages of ethanol detectors followed the Equation (2)

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Summary

Introduction

The NDIR ethanol gas sensor and Near-IR ethanol detecting system are currently researching and developing as promising candidates for driver alcohol detection system for safety (DADSS) [1]. Among the alternatives, the former was recognized as a more competitive one than the latter because of the size, the cost and compatibility to the electrochemical sensor type which is currently using in automotive and industrial areas as a screening device. Due to the above reasons, a unique NDIR ethanol gas sensor has been invented and its properties were briefly presented in terms of its temperature dependent outputs and compensation methods to predict the concentrations of ethanol gas irrelevant to the changes of ambient temperatures [2]. This paper tried to devise a new method by using two identical elliptical structures and ethanol detectors

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