12 December 1994 Grating interferometer with reconstructed wave of comparison
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The grating interferometer, used for analysis of the field of the refractive index in the inhomogeneous mediums, is described. The application of a space-frequency Fourier filtration for one of two interference light beams allowed us to transform a compact scheme of a shearing grating interferometer into an interferometer with an undisturbed based beam. Some experimental results are also presented, which illustrate a possibility of application of the interferometer for diagnostic of turbulent streams of stratificated fluid. A series of interferograms of the water flows were received under laboratory conditions. On the basis of measuring the phases of radiation, travelling through the investigated medium, the following statistic characteristics of streams were calculated: a standard deviation of the phases fluctuations, a spatial structural function and a function of mutual correlation of phases of radiation, travelling through different region of a water current.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. E. Chetkareva "Grating interferometer with reconstructed wave of comparison", Proc. SPIE 2340, Interferometry '94: New Techniques and Analysis in Optical Measurements, (12 December 1994); doi: 10.1117/12.195937; https://doi.org/10.1117/12.195937


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