Digital detector

Details Digital detector Digital detector

1976-05-10

1977-06-07

Habecker, Thomas B.

Communications: electrical

Digital comparator systems

324173, 340253C, 340271, 361 76, 361236, G08B 2100, G01P 348, G01P 354

Patent

active

040286860

ABSTRACT:
A detector for a dynamic phenomenon with a cyclically varying condition, as motion of a rotating part. At least three digital sensors are separated in phase with respect to the cyclic condition. The instantaneous outputs of the sensors have a plurality of repeating sequential states so long as the dynamic phenomenon exists. The instantaneous outputs of the sensors have at least one state which does not occur during existence of the dynamic phenomenon but which does occur in the absence thereof. Logic circuits respond to the digital sensor outputs and detect information about the dynamic phenomenon. Detection of the repetition rate of an instantaneous output state of the sensors provides a measure of speed. An absence of rotation is indicated by the occurrence of another output state. In another disclosed embodiment, the detector monitors a three phase power system and detects a phase outage by the occurrence of an abnormal sensor output state.

REFERENCES:
patent: 3513469 (1970-05-01), Christensen
patent: 3683354 (1972-08-01), Enk
patent: 3761811 (1973-09-01), Aberle

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