Device for the photoelectric determination of the position of at

Details Device for the photoelectric determination of the position of at Device for the photoelectric determination of the position of at

1981-10-16

1984-08-14

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, 356354, 356356, 356390, G01C 310, G01C 308

Patent

active

044653662

ABSTRACT:
Disclosed is a device for the photoelectric determination of the position of a focal plane of an image with an optical correlator. The invention comprises an imaging system, a grating structure located in the focal plane of the imaging system to function as a spatial frequency filter and a photoelectric receiver system. Light fluxes originating from an unknown object pass through the imaging system, and are modulated by the spatial frequency filter with the resulting light fluxes being converted into a display or control signal. The device includes an optical sensor for responding to mechanical or thermal variations which could affect the light fluxes of the optical correlator and which produces a display or correction signal. The device may be equipped with photoelectric receiver means sensitive to light in different spectral ranges and have means to selectively insert one or the other of the photoelectric receiver means into the optical correlator system. In accordance with the present invention, a catadioptric system is used as the imaging system and the grating structure of the optical correlator is positioned in the focal plane of the catadioptric system.

REFERENCES:
patent: 3969019 (1976-07-01), Nohda
patent: 4011445 (1977-03-01), O'Meara
patent: 4071772 (1978-01-01), Leitz et al.
J. R. Meyer-Arendt, Classical and Modern Optics, 1972, Prentice Hall, p. 137.

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