臺灣博碩士論文加值系統

本研究探討金屬平板裂縫檢測之渦電流表面探頭設計。渦電流探頭為纏繞於磁芯的電感與陶瓷電容組成的LC 並聯共振電路，經過混波器（Mixer）達到訊號放大效果，當偵測到裂縫時，可由示波器觀察到波形迅速反應及感測電壓產生變化。探頭以單線圈之絕對式探頭及雙線圈之差動式做為比較，兩探頭應用於自動掃描時，在固定1 mm間隙下，對SS304不鏽鋼和鋁合金可檢測最小深度0.3 mm的瑕疵；手動直接接觸扣環規塊量掃描測時，更可以檢測出最小深至0.2 mm的瑕疵。與差動式探頭比較，絕對式探頭的構造簡單且空間解析度較佳。研製之探頭能對金屬平板作非接觸或接觸式動態量測，將可應用於生產線自動化檢測與現場移動式檢測。

This study investigated the eddy current probe for crack detection in flat metal surface. The eddy current probe consists of a ferrite-core inductor coil and ceramic capacitors to form a parallel resonant circuit. The ac signal was amplified by using a mixer. In detection the crack, one can instantly observe the change in voltage waveform by using an oscilloscope. The several absolute and differential probes were made for comparison in the performance. When the absolute probe and the differential probe are tested with an automatic scanning system with a fixed 1 mm gap to the surface of test piece, the flaw with a minimum depth of 3 mm can be detected for SS304 stainless steel and aluminum plates. When scanned manually with the probe in contact with the surface of a buckle gauge block, the smallest depth of detectable flaw is only 0.2mm. In comparison with the differential probe, the absolute probe's structure is simple and the spatial resolution is better. The developed probes can be used for dynamic flaw detection in non-contact or contact mode. They will be suitable for applications in production line automation testing and on-site mobile testing.

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 2
第二章 文獻回顧與原理 3
2.1 文獻回顧 3
2.2 實驗原理 4
2.2.1 渦電流原理(Principles of Eddy Current) 4
2.2.2 LC共振原理(Principles of LC Resonance) 7
第三章 實驗方法 9
3.1渦電流探頭設計及製作 9
3.2人工瑕疵規塊製作 16
3.3鎖相放大器(Lock-in-Amplifier)製作 17
3.4 量測系統 19
第四章 結果討論與分析 22
4.1探頭共振頻率 22
4.2探頭穩定性分析 25
4.3人工瑕疵規塊掃描 27
4.4扣環人工瑕疵規塊掃描 35
第五章 結論 38
附錄A-1 鎖相放大器電路圖 40
附錄A-2 鎖相放大器實體模組 41
參考文獻 42

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