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7 July 1983 Automatic Evaluation Of Angular Movements And Linearity With Holographical Methods
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A real time holographic interferometer coupled to an automatic fringe analyzing system is presented to evaluate the linearity of the axial displacement of a translation stage. The 'basic holographic set up can separate the lateral from the longitudinal displacements and simplifies the fringe analysis. In plane rotation is identified by observing the nature of the variation of the fringe contrast with change in the viewing aperture stop. Tilt is idendified and measured in the conventional manner that requires a simple modification (a change in the point of illumination) of the basic setup. The automatic fringe analyzing system identifies the'center of a fringe as the midpoint between any two consecutive points of inflexion of the cosine density variation that may be ride on a variable dc bias due to noise and amplitude fluctuation in the recontructed image.
© (1983) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Celaya, D. Tentori, C. Lopez, and C. G. Lopez "Automatic Evaluation Of Angular Movements And Linearity With Holographical Methods", Proc. SPIE 0353, Industrial and Commercial Applications of Holography, (7 July 1983);

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