Monitoring optically powered actuators
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United States of America Patent
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Jan 2, 2007
Grant Date -
Feb 26, 2004
app pub date -
Aug 23, 2001
filing date -
Aug 25, 2000
priority date (Note) -
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Abstract
Operation of a power-by-light valve (15) by a source (11) along an optical fibre (13) is monitored by means of optical sensors (14) from which light passes back along fibre (13) to monitoring and processing units (16, 17). The sensors (14) include fibre bragg gratings (41, 43) for detecting differential pressure across diaphragms (42) and for detecting temperature. At the input end, an optical coupler (12) supplies sensor signals to units (16, 17) which can control source (11) via a signal (32).
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