Optically based torsion sensor

Details Optically based torsion sensor Optically based torsion sensor

1989-11-06

1991-03-26

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

25023114, G01L 312

Patent

active

050019376

ABSTRACT:
This invention concerns devices for optical measurement of torsion of a rotating shaft. The measurement system can readily be installed to monitor existing equipment because it requires only that a band consisting of alternating high and low reflectivity regions be placed on the shaft at the locations to be measured. The band may be applied as an adhesive tape, among other possibilities. One sensor head is located to correspond to each band. Each sensor head projects light onto the corresponding band, then collects the light reflected by the high reflectivity region(s) of the band. The phase displacement between the intensities of the reflected light at two or more sensor heads may be used to determine torsion on the rotating shaft.

REFERENCES:
patent: 2586540 (1952-02-01), Holden
patent: 3762217 (1973-10-01), Hagen
patent: 3871215 (1975-03-01), Pratt, Jr. et al.
patent: 4204115 (1980-05-01), Boldridge, Jr.
patent: 4525068 (1985-06-01), Mannava et al.

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