首页|Compressible gas density measurement by means of Fourier analysis of interferograms
Compressible gas density measurement by means of Fourier analysis of interferograms
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NSTL
Elsevier
This paper describes a method for nonintrusive compressible gas density measurement by means of automated analysis of interferograms using FFT (Fast Fourier Transform), and its implementation using DFT (Discrete Fourier Transform), that does make this measurement technique a fairly valuable and accessible experimental method. The presented approach makes it possible to use the finite fringe setting of the interferometer, thus reducing adjustment time. In the process of analysis, the errors originating from the imperfections of optical elements are reduced, and a digital image of a virtual infinite setting of the instrument is generated. As described here, the method is extremely beneficial, but not limited to, flows with shock wave - boundary layer interactions. A result of density measured for a flow with shock wave is presented.
Density measurementFourier image analysisInterferometryShock waveTRANSFORM PROFILOMETRYFRINGE ANALYSISFLOW
Telega, Janusz、Szwaba, Ryszard、Smialek, Malgorzata A.
NSTL
Elsevier
