Ultrasonic sensor with continous and demand self-test for liquid

Details Ultrasonic sensor with continous and demand self-test for liquid Ultrasonic sensor with continous and demand self-test for liquid

1997-08-25

1998-09-15

Noori, Max H.

Measuring and testing

Vibration

By mechanical waves

7386118, 7386125, 7386129, G01N 2902

Patent

active

058082000

ABSTRACT:
An ultrasonic sensor having a support structure of first and second walls with a gap of fixed distance therebetween. A piezoelectric element for transmitting and receiving ultrasonic energy is bonded to the inner face of one of the walls and the energy transmitted across the gap is reflected from the other wall back to the element. Two timing windows are set, one for the time of energy transmission across the gap with liquid present and the other with the gap being dry. The received energy at the time of the window indicating the dry gap condition is used as a self-test signal to check element dis-bonding. In a sensor with two elements, one bonded to each of the support walls, one element serves as the transmitter and the other as the receiver.

REFERENCES:
patent: 5031467 (1991-07-01), Rambow
patent: 5179862 (1993-01-01), Lynnworth
patent: 5269188 (1993-12-01), Esin et al.
patent: 5437178 (1995-08-01), Esin et al.
patent: 5473948 (1995-12-01), Moss et al.
patent: 5503035 (1996-04-01), Itoh et al.
patent: 5663508 (1997-09-01), Sparks

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