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21 November 1977 Setup For Three-Dimensional Measurement On An Image Reconstructed By Holographic Process
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When three-dimensional measurements of an object are to be made, two techniques are commonly used : a) If the object itself is available throughout the duration of the measurements, a mechanical finger, which is moved over the object, can be used. The measurements are made by recording the coordinates given by the finger as it is displaced. These measurements thus require a physical contact with the object. This contact may be destructive. b) In cases where no contact with the object can be tolerated, and where the object itself cannot be immobillized, techniques of short-distance photogrammetry can be used. However, this method also presents inconveniences : . certain object forms are not easily photographed from two different angles. . it is difficult to produce stereoscopic plates of objects moving at high translation velocities in normal lighting. . phase phenomena cannot be photographed. Because we are concerned in a large proportion of our activities with the testing of materials and photogrametric interpretation, and are moreover actively involved in the field of research on applications of holography, we have naturally become interested in the possibilities offered by holography in the field of three-dimensional measurement. Holography is, in effect, a technique permitting the recording and reconstruction, in simple fashion, of the image of a three-dimensional object. If certain precautions are taken, a stigmatic image, life-sized, is reconstructed, and we thus obtain, by means of a very simple setup, the equivalent of the " stereomodel " given by the conventional processes of photogrammetry. The exploitation of the image can be made by means of the two distinct techniques which have been studied.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Grosmann, P. Meyrueis, and M. Lasalle "Setup For Three-Dimensional Measurement On An Image Reconstructed By Holographic Process", Proc. SPIE 0126, Clever Optics: Innovative Applications of Optics, (21 November 1977);

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