Abstract
Optical heterodyne interferometry was validated to measure the transient temperature of a gas by comparing the temperature history of unburned gas in a combustion chamber, caused by compression due to flame propagation, obtained by the heterodyne interferometry with temperature obtained by assuming adiabatic change. When the density of gas changes, the effective optical path length of the test beam changes with corresponding changes of the refractive index. Therefore, the temperature history of the gas can be determined by measuring the pressure and the phase shift of the interference signal. As a result, it is clearly recognized that a non-intrusive measurement in the transient gas temperature was made successfully by the optical heterodyne interferometry. The resolution of the temperature measurement is approximately 0.5 K, and is dependent upon both the sampling clock speed of the AID converter and the length of the test section. Moreover, a polarization-preserving fiber was used to deliver the test beam to and from the test section to improve the feasibility of the system as a sensor probe. It may also be applied to other system requiring fast response density and temperature measurement of a gas, the latter necessitating a simultaneous record of transient pressure.
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Kawahara, N., Tomita, E., Kamakura, H. (2002). Transient temperature measurement of unburned gas using optic heterodyne interferometry. In: Laser Techniques for Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08263-8_10
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DOI: https://doi.org/10.1007/978-3-662-08263-8_10
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-07677-0
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