Filter rotator for coherent optical correlation system

Details Filter rotator for coherent optical correlation system Filter rotator for coherent optical correlation system

1978-01-16

1979-11-20

Stern, Ronald J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 71, G06G 900, G03H 116

Patent

active

041748859

ABSTRACT:
In a coherent optical correlation system for detection of object images at unknown angular orientations, a holographic spatial filter in the transform plane of the system is rotated until a correlation beam is produced. The spatial filter is mounted on a rotating cylinder which carries a first mirror placed in the path of the correlation beam emitted from the filter and disposed to direct the beam toward the axis of rotation of the cylinder and a second mirror on the axis and intercepting the beam for directing the correlation beam substantially along the axis. A motor drives the cylinder about its axis and an optical encoding device associated with the rotating cylinder provides an electronic indication of the cylinder orientation at any given instant.

REFERENCES:
patent: 3511571 (1970-05-01), Ogle
patent: 3666359 (1972-05-01), Lee
patent: 3762819 (1973-10-01), Myer
patent: 3822087 (1974-07-01), Bolusset
patent: 4111526 (1978-09-01), Joseph

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