Scan assembly and method for signal discrimination
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United States of America Patent
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Jul 15, 1997
Issued Date -
N/A
app pub date -
Jul 3, 1995
filing date -
Apr 5, 1994
priority date (Note) -
Expired
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Abstract
A method and apparatus for discriminating a valid return pulse from noise in a return signal received by an ultrasonic transducer in response to an interrogating pulse transmitted into a wall of a gas pipe by an ultrasonic transducer of a scan assembly. A discriminator is provided to compare the return signal with adjustable reference voltage thresholds which are continually adjusted by a discriminator computer in accordance with the noise characteristics of the return signal.
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