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Acoustic gas sensor with ppm resolution

Acoustic gas sensor with ppm resolution Acoustic sensors based on the well‐known relation between sound velocity and mean molecular mass are suggested for the determination of small concentrations of “pollutants”, such as CO 2 , in air. The theoretical basis for high resolution is outlined, and a basic design is presented, together with experimental results. Sound velocity is measured continuously at high resolution in an oscillator controlled by the acoustic transit time between a transmitter/receiver pair operating in the 40kHz range. The static error band is better than +/‐3 per cent of full scale, response time less than two minutes, and short‐term resolutions of 0.3 ppm rms, and 3 ppm rms have been obtained in terms of frequency and CO 2 concentration, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Sensor Review Emerald Publishing

Acoustic gas sensor with ppm resolution

Sensor Review , Volume 20 (2): 4 – Jun 1, 2000

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Publisher
Emerald Publishing
Copyright
Copyright © 2000 MCB UP Ltd. All rights reserved.
ISSN
0260-2288
DOI
10.1108/02602280010319231
Publisher site
See Article on Publisher Site

Abstract

Acoustic sensors based on the well‐known relation between sound velocity and mean molecular mass are suggested for the determination of small concentrations of “pollutants”, such as CO 2 , in air. The theoretical basis for high resolution is outlined, and a basic design is presented, together with experimental results. Sound velocity is measured continuously at high resolution in an oscillator controlled by the acoustic transit time between a transmitter/receiver pair operating in the 40kHz range. The static error band is better than +/‐3 per cent of full scale, response time less than two minutes, and short‐term resolutions of 0.3 ppm rms, and 3 ppm rms have been obtained in terms of frequency and CO 2 concentration, respectively.

Journal

Sensor ReviewEmerald Publishing

Published: Jun 1, 2000

Keywords: Gas sensors; Acoustics; Environment

References