Angular velocity indicating apparatus

Details Angular velocity indicating apparatus Angular velocity indicating apparatus

1975-03-10

1977-01-04

Corbin, John K.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

G01P 348

Patent

active

040016870

ABSTRACT:
Disclosed is an apparatus for generating a pulse train whose instantaneous repetition rate represents the instantaneous angular velocity of a rotating device.
An oscillator feeds a high frequency signal to a coil through which a center pole of magnetic material projects. The rotating device causes an object such as a gear to rotate, at least a portion of the extremity of which (e.g., the tips of its teeth, in the case of a gear) repeatedly comes into close contact with the tip of the center pole, separated only by a small air gap. This results in a change in inductance of the coil, which amplitude modulates the oscillator output. The modulated output is passed through a peak voltage detector which generates the desired pulse train.

REFERENCES:
patent: 2913662 (1959-11-01), Hogan
patent: 3043140 (1962-07-01), Waugh et al.
patent: 3177711 (1965-04-01), Ham et al.
patent: 3433070 (1969-03-01), Grimaldi
patent: 3559064 (1971-01-01), Grundy
Walewski, L. G., Kendrick V. C., Position Detection Device Using Amplitude Modulation, IBM Technical Disclosure Bulletin, vol. 14, No. 7, Dec. 1971, pp. 2119-2120.

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