Angular displacement measuring device

Details Angular displacement measuring device Angular displacement measuring device

1991-10-10

1992-08-11

Hellner, Mark

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

356 34, 250225, G01B 1116

Patent

active

051373530

ABSTRACT:
A system for measuring the angular displacement of a point of interest on a structure, such as aircraft model within a wind tunnel, includes a source of polarized light located at the point of interest. A remote detector arrangement detects the orientation of the plane of the polarized light received from the source and compares this orientation with the initial orientation to determine the amount or rate of angular displacement of the point of interest. The detector arrangement comprises a rotating polarizing filter and a dual filter and light detector unit. The latter unit comprises an inner aligned filter and photodetector assembly which is disposed relative to the periphery of the polarizer so as to receive polarized light passing the polarizing filter and an outer aligned filter and photodetector assembly which recives the polarized light directly, i.e., without passing through the polarizing filter. The purpose of the unit is to compensate for the effects of dust, fog and the like. A polarization preserving optical fiber conducts polarized light from a remote laser source to the point of interest.

REFERENCES:
patent: 4173412 (1979-11-01), Ramsay et al.
patent: 4321831 (1982-03-01), Tomlinson et al.
patent: 4420251 (1983-12-01), James et al.
patent: 4688934 (1987-08-01), Clark
patent: 4761073 (1981-08-01), Meltz et al.
patent: 4788868 (1988-12-01), Wilk
patent: 4806012 (1989-02-01), Meltz

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