Circuit and method of providing a stable display for eddy current instruments
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United States of America Patent
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Aug 8, 2017
Grant Date -
May 26, 2016
app pub date -
Nov 21, 2014
filing date -
Nov 21, 2014
priority date (Note) -
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Abstract
A rotary bolt hole eddy current inspection scanner using a differential eddy current probe, the circuitry of the scanner is embodied with a filtering circuit with three filters: FIR (Finite Impulse Response), a low pass filter, and a phase control filter (by means of a Hilbert transform). The result from a scan of a bolt hole is an output signal on an impedance plane exhibiting a “backwards 6” shape of stable size when the scanner changes its rotating rate significantly.
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