Noncontact shaft angle detector

Details Noncontact shaft angle detector Noncontact shaft angle detector

1984-06-25

1986-05-06

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

250231SE, 340347M, H03M 700

Patent

active

045875138

ABSTRACT:
Apparatus and method for non-contact determination of shaft angle utilizes a patterned disc secured to the shaft or other rotor being observed. The disc has sectors of different optical properties whereby radiant energy directed to the disc will be encoded by the sectored pattern. A set of detectors, which each correspond to one of the sectors, provides variable output signals according to the amount of radiant energy attenuated by the disc and directed onto the detectors. These signals are converted to a set of digital signals which define a unique rotational position, and a computing means calculates angular position from these signals. The computing means will, if necessary, compare the digital output signals and then calculate angular position in a manner which is insensitive to small decenters (or lack of concentricity) in the arrangement of the shaft, disc, detectors, and any associated optical system.

REFERENCES:
patent: 3603688 (1971-09-01), Smith-Vaniz
patent: 3918814 (1975-11-01), Weiser
patent: 4320293 (1982-03-01), Guretzky
patent: 4321531 (1982-03-01), Marshall
patent: 4327362 (1982-04-01), Hoss
patent: 4421980 (1983-12-01), Kuhhe

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