Optical inverse-square displacement sensor

Details Optical inverse-square displacement sensor Optical inverse-square displacement sensor

1987-06-10

1989-09-12

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354403, 354407, 354408, G01C 308

Patent

active

048654434

ABSTRACT:
This invention comprises an optical displacement sensor that uses the inverse-square attenuation of light reflected from a diffused surface to calculate the distance from the sensor to the reflecting surface. Light emerging from an optical fiber or the like is directed onto the surface whose distance is to be measured. The intensity I of reflected light is angle dependent, but within a sufficiently small solid angle it falls off as the inverse square of the distance from the surface.
At least a pair of optical detectors are mounted to detect the reflected light within the small solid angle, their ends being at different distances R and R+.DELTA.R from the surface. The distance R can then be found in terms of the ratio of the intensity measurements and the separation length as ##EQU1##

REFERENCES:
patent: 2206036 (1940-07-01), Herson
patent: 3512888 (1970-05-01), Humphrey
patent: 3744906 (1973-07-01), Sato et al.
patent: 3815994 (1974-06-01), Peckham
patent: 3885872 (1975-05-01), Howe et al.
patent: 3899251 (1975-08-01), Frenk et al.
patent: 4011403 (1977-03-01), Epstein et al.
patent: 4653905 (1987-03-01), Farrar et al.

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