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Title: Optical inverse-square displacement sensor

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 given in an equation. 10 figs.

Inventors:
;
Issue Date:
OSTI Identifier:
7067544
Patent Number(s):
4865443 A
Application Number:
PPN: US 7-060766
Assignee:
Leland Stanford Junior Univ., Stanford, CA (United States) PTO; EDB-94-118336
DOE Contract Number:  
FG03-85ER13393
Resource Type:
Patent
Resource Relation:
Patent File Date: 10 Jun 1987
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; DISPLACEMENT GAGES; DESIGN; MEASURING METHODS; OPTICAL EQUIPMENT; RADIATION DETECTORS; REFLECTION; VISIBLE RADIATION; ELECTROMAGNETIC RADIATION; EQUIPMENT; MEASURING INSTRUMENTS; RADIATIONS; 440600* - Optical Instrumentation- (1990-)

Citation Formats

Howe, R.D., and Kychakoff, G. Optical inverse-square displacement sensor. United States: N. p., 1989. Web.
Howe, R.D., & Kychakoff, G. Optical inverse-square displacement sensor. United States.
Howe, R.D., and Kychakoff, G. Tue . "Optical inverse-square displacement sensor". United States.
@article{osti_7067544,
title = {Optical inverse-square displacement sensor},
author = {Howe, R.D. and Kychakoff, G.},
abstractNote = {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 given in an equation. 10 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {9}
}