Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

Eddy current imaging has been used in eddy current nondestructive testing in order to identify small surface flaws in conducting materials [1–5]. However, the conventional pancake coil probes provide blurred flaw images because the eddy current in the test material induced by the probe spreads over a larger area than the coil size. The authors first applied popular deconvolution method to blurred ECT flaw images to get clear flaw images. However, it did not work well because a small drill hole signal does not correlate linearly to slit flaw signals. So the authors have devised a new ECT method utilizing a tangential coil and computerized tomography inversion technique in order to obtain clearer ECT flaw images.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16A

Chapter

Chapter 3: Signal Processing and Image Analysis

Section

Image Analysis

Pages

821-828

DOI

10.1007/978-1-4615-5947-4_107

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Clearer ECT Flaw Image Utilizing CT Inversion Technique

Brunswick, ME

Eddy current imaging has been used in eddy current nondestructive testing in order to identify small surface flaws in conducting materials [1–5]. However, the conventional pancake coil probes provide blurred flaw images because the eddy current in the test material induced by the probe spreads over a larger area than the coil size. The authors first applied popular deconvolution method to blurred ECT flaw images to get clear flaw images. However, it did not work well because a small drill hole signal does not correlate linearly to slit flaw signals. So the authors have devised a new ECT method utilizing a tangential coil and computerized tomography inversion technique in order to obtain clearer ECT flaw images.