Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-11-09
1980-11-25
Heyman, John S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
328127, 324 83A, 307232, H03D 1300
Patent
active
042361150
ABSTRACT:
A two input flip-flop circuit is successively triggered to alternate states by two series of electrical signal pulses, each of which corresponds to one of two rotating members and is of a frequency proportional to the rotational speed of the corresponding rotating member. The flip-flop circuit output signals are applied to an averaging filter circuit that produces an output ramp signal that increases substantially linearly in amplitude as a function of change of phase displacement of the pulses of the two series of electrical signal pulses and remains at a constant value when the phase displacement of the pulses of the two series of electrical signal pulses remains constant thereby indicating an equality of the rotational speeds of the two rotating members.
REFERENCES:
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patent: 3469196 (1969-09-01), Cowin et al.
patent: 3588699 (1971-06-01), Pysnik
patent: 3588710 (1971-06-01), Masters
patent: 3714463 (1973-01-01), Laune
patent: 3755745 (1973-08-01), Sapir
patent: 3798556 (1974-03-01), Doya et al.
patent: 3866133 (1975-02-01), Debloois et al.
patent: 3984701 (1976-10-01), Pieper
General Motors Corporation
Heyman John S.
Stahr Richard G.
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