Quantitative shearography in axisymmetric gas temperature measurements

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• 作者：VanDerWege ; Brad A. ; O’ ; Brien ; Christopher J. ; Hochgreb ; Simone
• 关键词：Interferometry ; Combustion diagnostics ; Temperature ; Fringe analysis
• 刊名：Optics and Lasers in Engineering
• 出版年：1999
• 出版时间：January, 1999
• 年：1999
• 卷：31
• 期：1
• 页码：21-39
• 全文大小：529 K

文摘

This paper describes the use of shearing interferometry (shearography) for the quantitative measurement of gas temperatures in axisymmetric systems in which vibration and shock are substantial, and measurement time is limited. The setup and principle of operation of the interferometer are described, as well as Fourier-transform-based fringe pattern analysis, Abel transform, and sensitivity of the phase lead to temperature calculation. A helium jet and a Bunsen burner flame are shown as verification of the diagnostic. The accuracy of the measured temperature profile is shown to be limited by the Abel transform and is critically dependent on the reference temperature used.