Method and apparatus for measuring the rotational speed of a sha

Details Method and apparatus for measuring the rotational speed of a sha Method and apparatus for measuring the rotational speed of a sha

1989-08-24

1991-03-12

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420725, 32420723, 32420726, G01B 714, G01P 348, G01P 354

Patent

active

049995790

ABSTRACT:
A method and apparatus are described, for measuring the angular velocity of a measuring body. In accordance with the present invention, the distance of the measuring body from a sensor varies periodically as the body is rotated, whereby the sensor emits a distance signal dependent on the distance, which distance signal is converted to a frequency-dependent signal in a converter circuit to determine angular velocity in a higher rpm region. To determine the angular velocity (or rpm) in a lower rpm region, the derivative of continuously varying distance between the sensor and a surface or partial surface of the measuring body is employed. In this way it is possible to measure rpm over a wide range down practically to zero.

REFERENCES:
patent: 4284916 (1981-08-01), Onodera et al.

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