Ultrasonic thickness gauge circuit with transit path correction

Details Ultrasonic thickness gauge circuit with transit path correction Ultrasonic thickness gauge circuit with transit path correction

1984-11-14

1986-02-18

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73616, G01N 2900

Patent

active

045704864

ABSTRACT:
An ultrasonic thickness gauge circuit includes a dual transducer probe and a logic circuit for providing square wave signals whose duration is equal to the time interval between the ultrasonic signal entering a workpiece to be measured and the reception of the ultrasonic signal reflected at the rear surface of the workpiece. When measuring thin wall thicknesses a measuring error arises due to the "V"-shaped transit path of the ultrasonic signals being greater than twice the wall thickness of the workpiece. A low-pass filter and a comparator are provided for modifying the square wave signals to effect correction. The modified signal is then used for providing clock pulses, the quantity of which is a measure of the wall thickness of the workpiece.

REFERENCES:
patent: 4182155 (1980-01-01), Fowler
patent: 4388830 (1983-06-01), Narushima
patent: 4437332 (1984-03-01), Pittaro

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