Electro-optical speed transducer

Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator

Patent

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Details

250231R, 250233, G01P 336

Patent

active

040371573

ABSTRACT:
A speed transducer for measuring the speed of a moving surface comprises a light chopper for alternately completing and breaking the respective light paths between a light source and first and second photodetectors such that the second light path is completed before the first light path is broken. A pulse generator produces a pulse having a duration which is determined by the time interval between completion of the first and second light paths. A converter converts the pulse to a direct current signal proportional to the speed of the moving surface by generating a comparison pulse, the width of which is controllable by a direct current control signal, and comparing the widths of the generator and comparison pulses to produce an error signal which is indicative of the difference in widths. A control signal is generated in response to the error signal which constitutes the desired output when the compared pulse widths are equal. In a second embodiment, the sum of two pulses representing the speed of a rotating surface at two opposed locations is integrated to produce a direct current signal proportional to the concentric rotational speed only.

REFERENCES:
patent: 3654480 (1972-04-01), Stephenson
patent: 3685909 (1972-08-01), Schwartz
patent: 3819268 (1974-06-01), Johnson
patent: 3878375 (1975-04-01), Mickowski

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