Electro-optical ranging apparatus having scanning circuitry and

Details Electro-optical ranging apparatus having scanning circuitry and Electro-optical ranging apparatus having scanning circuitry and

1982-10-25

1986-05-20

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354408, G01C 300, G03B 1318

Patent

active

045897700

ABSTRACT:
In an optical ranging apparatus, especially designed for measuring the range to a source of infrared radiation, a narrow band time-shift servoloop processor is used to resolve the offset (separation distance) of images of the infrared source that are projected onto first and second, juxtaposed photooptical detector arrays. The range (distance) to the infrared source is functionally related to the measured offset of the infrared images. To enable the servoloop processor to measure this offset, the outputs of the first and second detector arrays are automatically scanned by electronic scanning circuitry to develop first and second time-variable signals that represent the relative positions of the infrared images on the respective arrays. These time-variable signals are substantially overlapping, and the slight phase or time separation between these signals is related to the offset of the images on the detector arrays. The servoloop processor receives the substantially overlapping time-variable signals from the scanning circuitry and resolves the time difference therebetween as a continuously variable time shift .DELTA.t signal. The measured offset is then fed to a ranging processor to produce a signal representing the range (R) to the distant infrared source.

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