Method and device for generating a signal dependent on the dista

Details Method and device for generating a signal dependent on the dista Method and device for generating a signal dependent on the dista

1976-03-15

1977-08-09

Buczinski, S.C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250201, 356168, G01C 308

Patent

active

040407390

ABSTRACT:
A light beam passes through a physical pattern of opaque and transparent areas and is projected into space to an image plane. Upon an object appearing at the image plane the pattern is reflected back to the physical pattern as a second pattern image. The optical system is such that, in part, this second pattern image is a reversal of the pattern. The physical pattern is on a rotating drum to produce relative motion between the second pattern image and the pattern. Light from the second pattern image which passes through the pattern is received by a photoelectric cell to generate a signal. By having the pattern in the form of a spiral and the width of the pattern correspond to the width of the light beam at the point where it intersects the beam, various distances can be detected.

REFERENCES:
patent: 3599552 (1971-08-01), Harvey
patent: 3653762 (1972-04-01), Harvey
patent: 3781110 (1973-12-01), Leitz et al.
patent: 3856400 (1974-12-01), Hartmann

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