Eddy wheel edge sensor

Details Eddy wheel edge sensor Eddy wheel edge sensor

1990-11-29

1992-07-14

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324142, 324137, 324157, 324175, 25023118, 25023117, G01R 1102, G06F 1520

Patent

active

051306417

ABSTRACT:
A sensor for detecting the rotation of an eddy wheel in an electric power meter is described. The sensor includes a pair of light sources arranged to focus light on the edge of the wheel, and a light detector arranged to sense reflections from the edge of the wheel caused by the light from the light sources. The light from either sensor is sufficient to trigger the detector, thereby requiring a sufficiently large interruption in the reflection, for example as caused by a mark on the edge of the eddy wheel, to interrupt the detector output. A filter is described for eliminating jitter in rotation of the eddy wheel.

REFERENCES:
patent: 3127594 (1964-03-01), Roe et al.
patent: 4321531 (1982-03-01), Marshall
patent: 4327362 (1982-04-01), Hoss
patent: 4604725 (1986-08-01), Davies et al.
patent: 4660036 (1987-04-01), Mosier
patent: 4713610 (1987-12-01), Willis
patent: 4792677 (1988-12-01), Edwards et al.
patent: 4956551 (1990-09-01), Repachlager et al.

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