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27 May 2003 Microscopic ESPI: better fringe qualities by the Fourier transform method
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Proceedings Volume 4933, Speckle Metrology 2003; (2003)
Event: Speckle Metrology 2003, 2003, Trondheim, Norway
Electronic speckle pattern interferometry (ESPI) is discussed for the detection of out-of-plane deformations in small objects. For increasing the resolution in object space a laser source of small wavelength is combined with a microscope with a high numerical aperture. Fringe quality is increased by using spatial phase-shifting and the Fourier transform method to allow deformation detection also under non-optimum conditions. The efficacy will be shown in some measurements on different specimens where deformations are successfully recorded in areas down to a few micrometers in size.
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Akram El Jarad, Gerd Gulker, and Klaus D. Hinsch "Microscopic ESPI: better fringe qualities by the Fourier transform method", Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003);

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