Ultrasonic position sensor and method
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United States of America Patent
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-
Jul 20, 1993
Grant Date -
N/A
app pub date -
Jul 26, 1991
filing date -
Jul 26, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasonic position sensing apparatus for detecting open, closed and intermediate positions of a valve element movably mounted in a valve housing includes an ultrasonic target fixedly attached to the valve and having an echo surface which provides a travel time difference for a returning echo, depending on the position of the valve element. An ultrasonic transducer coupled to an outer surface of the valve housing transmits an ultrasonic pulse towards the target thereby generating the echo by striking the target; a monitor means connected to the ultrasonic transducer correlates valve position to the travel time of the returning echo.
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