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Temperature and Pressure Measurements using Oxygen Fluorescence

DOI: 10.1615/ICHMT.2004.IntThermSciSemin.260
pages 253-258

Tadej Semenic
Morrin-Martinelli-Gier Memorial Heat Transfer Laboratory, Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Box 951597, CA 90095-1597

Benjamin A. Blake
Morrin-Martinelli-Gier Memorial Heat Transfer Laboratory, Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Box 951597, CA 90095-1597

Ivan Catton
Morin, Martinelli, Gier Memorial Heat Transfer Laboratory, Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of California, Los Angeles, USA

Abstract

A method for the measurement of temperature and pressure using oxygen fluorescence for eventual use aboard an aircraft is presented. A xenon flashlamp is used to excite oxygen molecules with photons of wavelengths from 185 to 200nm. Large windows of detection (100nm and 65nm) are used to reduce the fluctuations in the total measured fluorescence caused by predissociation and quantum noise. Temperature and pressure are correlated with fluorescence ratio. The resulting error in temperature and pressure is found to depend on the number of averaged samples. A typical error for a flash rate of 60Hz is ±3° C for temperatures from −22 to 44° C and ±0.06 atm for pressures from 0.5 to 2.0 atm.

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