Optical sensor for detecting liquid medium
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United States of America Patent
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-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Dec 7, 1988
filing date -
Jun 17, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical sensor comprises a probe (10) and an annular optical element (13) coupled optically to a pair of optical fibres (18). Light transmitted down one fibre is reflected around the element (13) and back up the other fibre to a photodetector. The level of light received by the photodetector is dependent upon the amount of light lost from the element (13) as a result of characteristics of the surrounding medium. The presence or absence of a surrounding liquid medium may thus be sensed and a motor (34) operated to suck liquid up through the probe, when the liquid is present.
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