An Evaluation of the Fluidic Oxygen Partial Pressure Sensor.
Abstract
A theoretical concept for a fluidic gas partial pressure sensor is evaluated. In the sensor concept, a fluidic resistive bridge gas concentration sensor is powered by the vacuum produced with a compressible flow ejector. Because of the ejector characteristics, the pressure drop across the bridge is proportional to the ambient pressure; hence, the sensor output is proportional to the gas concentration and the ambient pressure, the product of which is partial pressure. A complete mathematical model is derived that is in close agreement with the experiment. A prototype sensor is discussed and tested over a range of 0.3 to 1.0 atmospheres pressure and 0 to 100% concentrations of CO2 in air and O2 in air. The test results show that the sensor responds to both variables. Environmental sensitivities and signal amplification are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1977
- Accession Number
- ADA055362
Entities
People
- Robert L. Woods
Organizations
- University of Texas at Arlington