Method and apparatus for monitoring the operation of ultrasonic

Details Method and apparatus for monitoring the operation of ultrasonic Method and apparatus for monitoring the operation of ultrasonic

1976-12-13

1978-01-03

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

73629, G01N 2904

Patent

active

040659607

ABSTRACT:
This invention relates to immersion ultrasonic pulse-echo testing of tubes or bars for internal defects wherein means are provided to continuously monitor the operation of the test channel. As ultrasonic energy enters the workpiece, the round workpiece surface causes acoustic energy scatter responsive echo signals which are sensed by the transmitter probe, are amplified and applied to a threshold circuit. If the amplitude of the scatter responsive signal falls below a predetermined level, an output signal indicative of "loss of operation" is produced. Means are provided to inhibit such output signal in the event of only a momentary decrease of the scatter responsive signal below a predetermined value.

REFERENCES:
patent: 3685348 (1972-08-01), Bottcher et al.
patent: 3888114 (1975-06-01), Adams et al.

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