Improving Ultrasonic C-Scan Resolution Using the Hilbert-Huang Transform

The Hilbert Huang Transform (HHT) is applied to ultrasonic mapping of simulated defects in an aluminum plate. C-Scanning tests are conducted using pulse-echo ultrasound on a water-immersed aluminum plate containing a matrix of 16 unevenly-spaced flat-bottomed holes. After decomposing the time-gated...

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Bibliographic Details
Main Authors: Leisk, G.G., Miller, E.S., Murphy, D.J.
Format: Conference Proceeding
Language:English
Subjects:
ALUMINIUM
DEFECTS
ENGINEERING
PLATES
PULSES
RESOLUTION
TRANSDUCERS
ULTRASONIC TESTING
WAVE FORMS
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Summary:The Hilbert Huang Transform (HHT) is applied to ultrasonic mapping of simulated defects in an aluminum plate. C-Scanning tests are conducted using pulse-echo ultrasound on a water-immersed aluminum plate containing a matrix of 16 unevenly-spaced flat-bottomed holes. After decomposing the time-gated echo waveforms into simpler waveforms with HHT, the Hilbert transform is applied and a single RMS parameter derived for every transducer location. HHT provides good capability for sizing and locating defects and excellent defect/non-defect contrast. There are clear implications for improved mapping of more subtle defects.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1916768