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Proceedings Paper

Self Powered Fiber Optical Sensors
Author(s): Mark Johnson
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Paper Abstract

The problem of supplying power to optical and in particular fiber-optical sensors may be solved by generating electrical energy locally. This idea is illustrated here with several optical sensors, taken primarily from mechanical measurement applications. Incremental rotary encoders for transducing shaft position in rotating machinery are described which have a mechanical shaft input and 50/125μm fiber-optical signal outputs. They combine a DC generator or AC alternator with an internal fiber coupled optical emitter, allowing self-contained operation, independant of dedicated optical or electrical supplies. Incremental pulse generation is effected either by an encoder disc, or directly from the voltage periodicity of the AC alternator output. Applications include machine control, flow measurement, and limit detection in electrically noisy environments. A second class of sensors is demonstrated, transient optical sensors, which generate an optical output only for a short duration on activation of a particular transducer. With appropriate local intelligence in the form of low-power electronics, and suitable codes and transmission protocols, several sensor heads may be multiplexed onto a common optical bus.

Paper Details

Date Published: 23 February 1989
PDF: 5 pages
Proc. SPIE 1011, Fiber Optic Sensors III, (23 February 1989); doi: 10.1117/12.949315
Show Author Affiliations
Mark Johnson, York Harburg Sensor GmbH (Germany)

Published in SPIE Proceedings Vol. 1011:
Fiber Optic Sensors III
Ralf Th. Kersten, Editor(s)

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