電橋式渦流檢測系統研究

1944751 2011-03-07 | rar | 1.65 MB | 次下載 | 10積分

資料介紹

?渦流檢測技術采用頻譜豐富的正弦信號作為激勵源，響應中包含多個頻率成分，增強了渦流檢測的抗干擾能力。將渦流檢測技術、數據采集技術與虛擬儀器技術有機結合起來，開發了適用于在線檢測的渦流檢測系統。系統由脈沖渦流檢測硬件電路、PXI總線系統以及相關軟件組成。硬件電路可產生性能良好，頻率、幅值穩定的激勵信號，頻率范圍為0～5 MHz；結合PXI總線系統和LabVIEW虛擬儀器軟件平臺，實現了信號的采集、分析、處理與顯示。實驗結果表明，本系統可以檢測直徑為0.6 mm的缺陷，具有較好的量化檢測能力。

Abstract:: ?Eddy current testing employs rich frequency sinusoidal signal as the excitation source， and many frequency components are included in corresponding response. Meanwhile， the counter-interference of eddy current testing is improved. An eddy current testing system suitable for on-line detection is developed based on current testing， data acquisition and virtual instrument. The system was composed of eddy current testing hardware circuit， PXI bus system and relative software. The hardware circuit generates excitation signals with excellent waveform， stable frequency （range of 0～5MHz） and stable amplitude. Combining with PXI bus system and LabVIEW virtual instrument software platform， the system offers functions of acquisition， analysis， processing and display of the signals. Testing experiments were done through the system， and the results showed that the system can detect the defect diameter of 0.6mm， with a good testing capability.