Speckle interferometers with matched wavefronts for measurement of vibrations and small displacements

Vladimir P. Ryabukho; Vladimir L. Khomutov; Valery V. Tuchin

doi:10.1117/12.211873

14 June 1995 Speckle interferometers with matched wavefronts for measurement of vibrations and small displacements

Vladimir P. Ryabukho, Vladimir L. Khomutov, Valery V. Tuchin

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211873
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The optical schemes of speckle interferometers for measurements of vibrations and microdisplacements that provide matching of interfering speckle fields are considered. Matching of wave fronts provides the maximal, on the average, magnitude of the output signal of the interferometer working in the mode of many speckles recording. It is shown that these interferometers with reference Gaussian beam operate in the mode of a confocal scheme and in the one-speckle mode of recording. In this case the photoreceiver aperture is determined by the reference beam aperture that is comparable with speckle sizes in the output field. The confocal scheme can be realized also using the reference speckle modulated beam and the multispeckle mode of recording. The schemes of differential speckle interferometers for investigations of longitudinal and transverse displacement are considered. The distinctions in statistical characteristics of the output signal of speckle interferometers with smooth and speckle-modulated reference waves are discussed.

Citation Download Citation

Vladimir P. Ryabukho, Vladimir L. Khomutov, and Valery V. Tuchin "Speckle interferometers with matched wavefronts for measurement of vibrations and small displacements", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211873

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