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RESEARCH PAPERS

A Fluidic Bridge Gas Concentration Sensor Applicable to Respiratory Gases

[+] Author and Article Information
R. L. Woods

Fluidic Systems Dev. Branch, Harry Diamonds Labs, Washington, D.C.; Univ. of Texas at Arlington, Arlington, Tex.

F. Villarroel

Fluidic Systems Dev. Branch, Harry Diamonds Labs, Washington, D.C.; National Inst. of Health, Bethesda, Md.

J. Dyn. Sys., Meas., Control 97(3), 243-248 (Sep 01, 1975) (6 pages) doi:10.1115/1.3426926 History: Received June 06, 1975; Online July 13, 2010

Abstract

This paper describes a flueric gas concentration sensor potentially suitable for determining the concentration of carbon dioxide in respiratory gases. The sensor consists of fluid resistors connected in a bridge circuit and generates a differential pressure signal proportional to the concentration of CO2 . The sensor is capable of measuring from 0.07 to 100 percent CO2 in air. The system discussed in this report contains a high-gain laminar proportional amplifier to produce high-level output signals. The amplified sensitivity of the prototype system is 0.6 kPa/percent CO2 (0.09 psi/percent CO2 ). The experimental results are in agreement with the theoretical analysis and show good linearity and low noise.

Copyright © 1975 by ASME
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