Eddy Current Test Samples, Probes and Scanning System

Eddy Current Signal Calculations for Surface Breaking Cracks

“…Software has been developed by S. Jeffries to implement this calculation with either theoretical probe fields (air-core) or measured probe fields (ferrite-core). Figures 3, 4, and 5 show examples calculated for rectangular shaped models of two of the fatigue cracks grown at Martin-Marietta (Rummel and Rathke, 1984). The scan direction is along Xo in Fig.…”

“…The goal of the work reported here and in companion papers by Rummel and Rathke (1984), Auld, et al (1984), and Martinez and Bahr (1984) is to improve the quantitative character of eddy current testing. In this joint effort, the role of probe-flaw interaction modeling is to provide engineering tools not previously available for: (1) setting design guidelines to optimize sensitivity and spatial resolution, (2) permitting analytic extrapolation of measured flaw response data, (3) defining a test basis for monitoring probe calibration, and (4) establishing a rational inversion procedure based on multifrequency measurements and the shape signature of a scanned flaw signal as a function of position.…”

Assessment of the Effects of Scanning Variations and Eddy Current Probe Type on Crack Detection

“…Attention has been focused on this problem and much of the work described in this volume is directed toward the determination of critical characteristics of NDE applications and in the generation of supporting theory to facilitate predictive modeling of NDE performance capability. The experimental work described in this paper expands on previous work on the characterization of eddy current probes, as applied to flaw detection [1,2], and is directed to support the expansion of application theory [3].…”