Application of holographic interferometry to supersonic flow visualization of a rearfacing step and application of fast Fourier transform methods to current data reduction techniques.
Jones, Harland Wilber Jr.
Collins, Daniel J.
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The successful application of holographic interferometry to the study of three-dimensional density fields around bodies in wind tunnel experiments has been reported in the literature along with the associated mathematical reduction processes for the basic interferometric equation. The present report has extended the application of holography as a flow visualization technique by investigating Mach 2.8 flow over a rear-facing 1/8 in. step. Two single- exposed holograms of the model and two double- exposed frozen fringe holographic interferograms of the flow were created. Fast Fourier Transform (FFT) methods have been reported as significantly reducing computational time to obtain discrete and inverse discrete Fourier transforms. Two computer programs were designed to apply FFT methods to the Fourier transform approach to the basic interferometric equation. These programs were used to investigate an alternate way to calculate the value of the inside integral. Total agreement was not found, and further analysis as to the accuracy of each method is needed.
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