Ultrasonic position sensor and method

Details Ultrasonic position sensor and method Ultrasonic position sensor and method

1991-07-26

1993-07-20

Noland, Tom

Measuring and testing

Vibration

By mechanical waves

73168, G01N 2900

Patent

active

052283429

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.

REFERENCES:
patent: 4777979 (1988-10-01), Twerdochlib
patent: 4920802 (1990-05-01), McMullin et al.
patent: 4977778 (1990-12-01), Nafziger et al.
patent: 5008841 (1991-04-01), McElroy

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