Heterodyne Holographic Interferometry For High Resolution 3-D Sensing

James W. Wagner

doi:10.1117/12.937837

22 January 1987 Heterodyne Holographic Interferometry For High Resolution 3-D Sensing

James W. Wagner

Proceedings Volume 0728, Optics, Illumination, and Image Sensing for Machine Vision; (1987) https://doi.org/10.1117/12.937837
Event: Cambridge Symposium_Intelligent Robotics Systems, 1986, Cambridge, MA, United States

Abstract

Heterodyne and "quasi"-heterodyne techniques applied to holographic interferometry provide both increased sensitivity and means for automated analysis of fringe information. Holograms may be recorded which contain optical path difference information related to surface contour, displacement, or deformation of an object of interest. Optical path difference resolution approaching 1/2000 of a wavelength (about 2.5 Angstroms) has been demonstrated using heterodyning techniques in which image data is electronically reduced to produce high resolution maps of contours or deformation of objects with specular or diffuse reflecting surfaces. This represents a 1000-fold improvement in sensitivity over that acheived using conventional holographic interferometry. The fact that dimensional data is taken directly from the image plane of the interferometer unambiguously and without the need for human interpretation, suggests the potential for the use of these or similar techniques for some machine vision applications.

Citation Download Citation

James W. Wagner "Heterodyne Holographic Interferometry For High Resolution 3-D Sensing", Proc. SPIE 0728, Optics, Illumination, and Image Sensing for Machine Vision, (22 January 1987); https://doi.org/10.1117/12.937837

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