Liftoff Correction Based on the Spatial Spectral Behavior of Eddy-Current Images

被引：32
作者：
Ribeiro, A. Lopes [1 ]
Alegria, Francisco [1 ,2 ]
Postolache, Octavian A. [1 ,2 ]
Geirinhas Ramos, Helena Maria [2 ]
机构：
[1] Univ Tecn Lisboa, Inst Telecomunicacoes, P-1049001 Lisbon, Portugal
[2] Univ Tecn Lisboa, Inst Super Tecn, P-1049001 Lisbon, Portugal
来源：
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2010年 / 59卷 / 05期
关键词：
Eddy currents; giant magnetoresistance; liftoff effect; nondestructive testing; spectral analysis; CONDUCTIVITY; CRACK;
D O I：
10.1109/TIM.2010.2043981
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this paper, a new processing scheme for compensating the liftoff effect is proposed to increase the signal-to-noise ratio of measurements carried out when a duralumin plate with artificially manufactured defects was scanned with eddy-current probes. The mathematical algorithm is based on the spatial frequency behavior of the output signals with the liftoff distance (the distance between the probe used for inspection and the sample) and its equivalent form (deconvolution) in the spatial domain. Results are presented for measurements performed at three different distances for the same defect of the duralumin plate.
引用
收藏
页码：1362 / 1367
页数：6
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