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? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?J?f?f? ?K? ?K? ?r?J?z?r? ?k?Y?“? ?fK? ? ? ?K? ?K ? ? ? ?K?R?ck? ?cH?I?K?、? ?、?K? ?k?K? ?J?M?N?M?N? ?K? ?J?J?J?J?K? ?Y?K?J? ?”?J?J?J?J? ?J?K?J? ?K 1971 ? ? LIBBY ? ?K?”? ?J?J? ?K? ?k”? ?k? ?c?K ?Z?K ?c? ?K ?k? ? ?R? ?K ?J?J? ? ?(?(? ? ? ?K? ?K? (?(? ? ? 3?k?K 4? ? ?K 5?Y? ? ?K ?J?J?J?J? ? )?)? ? ? ?!?“?K? ?!?J?K? )?)? ? ? ?、? ?K?38?k?c?、?“? ?k?、? ?K02/1?k? ?“?c?K ? ? ?“? ?k?K? ? ? ? ?c? ?c?c? M4-1N M)?N?c?A?c?c?c ?K?c? ?Y?z?r? ?K?c? M4-2N M4-3N M)?N?M)?(N?7?9? ?6? ? ?9? ?6? ?K? ?Z? ? ?Z? ?K? ?、?、? ? ? ?、?J?J? ?K ? ?c?72?/?1?c?72?K? ?K? ?c? M4-4N M)?)N?/?c?C?D?D? c?A? c? ?5?c?D?c?K? c?2?c?)?K? ? ? ?J ?K ?k? ?K? ?K )?(?)?(? ? ?(?.?)?K ? ?)?)?K? ?)?)?、K? ?)?K? ?,?(?K? ?K? ?,?K? ?J?J? ? ? LIBBY H L. Introduction to electromagnetic nondestructive test method ?MT . New York: John Wiley LSons Inc, 1971? ? ?. ? ? ?4?. ?, ?-, ? : ?-? ?(? ?, ?, ?e. ?、?4?. ?, ?., )? : ,-?,-(? ?)? ?. ?4?. ?, ?, ? : ?.?(? ? Thompson J G. Subsurface Corrosion Detection in Aircraft Lap Splices Using a Dual Frequency Eddy Current Inspection TechniqueJ. Materials Evaluation, 1993, 51(12): 1398-1401. ? Edward P, Manson J. The Application of Dual-Frequency Eddy Current Inspection to Aircraft StructuresJ. Insight: Non-Destructive Testing and Condition Monitoring, 2002, 44(3): 141-145. ?,? Bos B V D, Sahlen S, Andersson J. Automatic Scanning With Multi-Frequency Eddy Current on Multi-Layered StructuresJ. Aircraft Engineering and Aerospace Technology, 2003, 75(5): 491-496. ?-? Scheer G, Frische L, Meier T. Borehole Inspection on Aircraft tructuresC. 9th European Conference on NDT 2006. Berlin, Germany. Sep. 25-29, 2006: 1-7. ?.? ? 73?-/ ?4?. ?, ?, ? : )(?)()? ? ?, ?, ?. ?4?. ?, ?, ?,? : ?(?()? ? ?。?, ?. ?4?. ?, ?-, ? : (?)?(?,? ? ?. ?4?. ?, ?, ? : (?)? ?(? ?, ?. ?4?. ?, ?, ?)? : ?)?)(? ?)? ?, ?, ?t?. ?4?. ?, ?, ? : ?(?(.? ? ?. ?、?4?. ?, ?., (? : -),? ?-? ? YIN W, PEYTON A J. Thickness measurement of non-magnetic plates using mul