Device for detecting displacement of an optical image

Details Device for detecting displacement of an optical image Device for detecting displacement of an optical image

1978-11-13

1980-08-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250209, 358105, H01J 3912

Patent

active

042186234

ABSTRACT:
In a device for detecting displacement of an optical image by an image forming optical system in a direction substantially perpendicular to the optic axis of the image forming optical system, there is provided an array of photosensitive elements comprising a plurality of photosensitive elements disposed on or near the image plane of the image forming optical system, means for generating an electrical output creating a phase change in response to the displacement of the optical image in the direction of arrangement of the photosensitive elements in accordance with the outputs of the photosensitive elements of the array, contribution reducing means for reducing the contribution to the electrical output of the outputs of the plurality of photosensitive elements located near the opposite ends of the array, and detector means for detecting the displacement of the optical image from the phase information of the electrical output of the electrical output generating means.

REFERENCES:
patent: 3700801 (1972-10-01), Dougherty
patent: 3793523 (1974-02-01), Desvignes et al.
E. M. Winter, "3D Fourier Transform Technique for Motion Detection; " IBM Technical Disclosure Bulletin; vol. 19, No. 12, May 1977; pp. 4777-4778, 358-105.
Kowel et al., "Passive Detection of Motion Transverse to the Optical Viewing Axis," IEEE Transactions on Instrumentation and Measurement, Sep. 1975; pp. 248-255, 358-105.

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