Ultrasonic thickness gauge circuit with transit path correction
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United States of America Patent
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Feb 18, 1986
Grant Date -
N/A
app pub date -
Nov 14, 1984
filing date -
Jan 14, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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