Method of and apparatus for the positional detection of objects

Details Method of and apparatus for the positional detection of objects Method of and apparatus for the positional detection of objects

1987-07-31

1990-04-17

Rosenberger, Richard A.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01B 9021

Patent

active

049174975

ABSTRACT:
A holographic technique for the detection of position of known items so as to be able to reject those samples which do not lie within certain defined spatial parameters. A plate which contains a single exposure of the three dimensional holographic image of an object is illuminated by parallel reference beams from a laser to allow the reconstruction of a real focused image of the object. A displacement translator supports the object and permits displacement thereof in three directions all at right angles to one another. The coincidence of the object and its holographic image are detected either optically by means of a stereoscopic microscope, or electrically by means of a stereoscopic microscope and a photo-diode.

REFERENCES:
patent: 3592548 (1971-07-01), Majkowski
patent: 3711202 (1973-01-01), Rush et al.
Dirtoft et al., "Holgraphic Measuring of Deformations in Complete Upper Dentures", Proc. Soc. Photo-Opt. Instrum. Eng, (vol. 211) pp. 106-110, 1979.
Xu et al., "Holographic Technique for Simultaneous Measurement of Displacement and Tilt", Applied Optics, vol. 22, No. 14 (15 Jul. 1983) pp. 2137-2140.
Bjelkhagen, Hans, "Sandwich Holography for Compensation of Rigid Body Motion and Reposition of Large Objects", Proc. Soc. Photo-Opt. Instrum. Eng (vol. 210) 1979, pp. 123-127.

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