Ultrasonic fault detection system using a high dynamic range analog to digital conversion system
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United States of America Patent
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Aug 23, 2011
Grant Date -
Apr 19, 2007
app pub date -
Jul 20, 2006
filing date -
Oct 14, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for effecting ultrasonic flaw detection of an object processes an echo signal received from the object being tested in at least three signal channels, wherein the echo signal is scaled to different degrees along each channel to increase and extend the dynamic range of an associated A/D converter system, in a manner which dispenses with the need for using numerous analog high pass and low pass filters and a variable gain amplifier. This reduces complexity and avoids performance limitations. The digital to analog converters sample the differently scaled input signal and a selection circuit selects the output of the digital output obtained from that analog to digital converter which has the highest gain, but which has not overflowed. The digital outputs are seamlessly merged to produce an output that can be displayed as a scan display which shows the location of faults.
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