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


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
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In