Continuous self test time gate ultrasonic sensor and method

Details Continuous self test time gate ultrasonic sensor and method Continuous self test time gate ultrasonic sensor and method

1993-03-24

1993-12-14

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73 10V, 367 93, G01N 2902, G01N 2922

Patent

active

052691888

ABSTRACT:
A time gate ultrasonic sensor measures a physical property of a material, such as the presence of the material, within a defined space. The sensor includes at least one transducer connected to a support structure and positioned generally adjacent the defined space for transmitting and receiving ultrasonic signals across the defined space. The ultrasonic signals include a main waveform which travels across the defined space and a self-test waveform which travels along the support structure. The sensor monitors the received ultrasonic signals during a main time window to sense whether the main waveform is present in the received signals. The sensor senses the physical property of the material within the defined space as a function of whether the main waveform is present within the time window. The sensor performs a self-test each measurement cycle by determining whether the self-test waveform is present during a self-test time window which is different from the main time window.

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