Digital photo-optical tachometer

Details Digital photo-optical tachometer Digital photo-optical tachometer

1975-05-05

1977-06-21

Rolinec, Rudolph V.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324166, 324 83R, 324 83FE, G01P 336, G01R 2500

Patent

active

040314669

ABSTRACT:
A digital tachometer having an optical sensor which provides a signal at a frequency related to the rotational or reciprocating speed of a moving object, a phase locked loop and a frequency divider circuit connected for operation as a frequency multiplier to be responsive to the sensor signal to provide a serial pulse train the period of which is an integral multiple of the sensor signal, a pulse accumulator for registering the pulses and a time rate generator which enables the pulse accumulator to register pulses for a preset duration so that the number of pulses registered is a direct representation of the revolutions per minute of the moving object.

REFERENCES:
patent: 3311755 (1967-03-01), Hebb
patent: 3441871 (1969-04-01), Wicker
patent: 3551808 (1970-12-01), Grossimon et al.
patent: 3704445 (1972-11-01), Lanham
patent: 3729996 (1973-05-01), Metz
patent: 3746985 (1973-07-01), Perron
patent: 3811056 (1974-05-01), Baba et al.
patent: 3821896 (1974-07-01), Grob
patent: 3908167 (1975-09-01), Hulls et al.
Digital Phase-Locked Loop, Blerkom et al., IBM Tech. Disclosure Bulletin, vol. 10, No. 3, Aug. 1967, pp. 256-257.

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