鋼管高速漏磁檢測中渦流效應(yīng)實(shí)驗(yàn)分析
Experimental Analysis of Eddy Current Effect Produced during Steel Tube Hi-speed MFL Testing
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摘要: 通過將鋼管直線高速掃描運(yùn)動(dòng)轉(zhuǎn)換為圓環(huán)旋轉(zhuǎn)高速掃描運(yùn)動(dòng)的方式, 組建了高速漏磁檢測裝置;分析基線漂移的根源--渦流效應(yīng), 以及高速漏磁檢測中渦流效應(yīng)存在的物理詮釋及其分布特點(diǎn)。對比分析表明:0~12 m/s的掃描速度對檢測信號幅值的影響不大, 但由于確實(shí)存在渦流效應(yīng), 所以導(dǎo)致所獲得檢出信號波形基線發(fā)生了漂移, 而基線的漂移方向取決于磁敏元件布置在磁化器中的位置, 基線漂移可通過一定的軟件補(bǔ)償調(diào)整而得到處理Abstract: The high-speed magnetic flux leakage detection system is set up by means of converting the steel pipe linear hi-speed scanning movement into a rotary hi-speed scanning movement. It is identified via analysis that eddy current effect is the root cause for drifting of the baseline. And why eddy current effect exists during the hi-speed MFL detection process is explained from a physical point of view. Also analyzed is the distribution characteristics of the eddy current effect. Relevant comparative analysis shows that 0~12 m/s scanning speed produces little impact on the test signal amplitude value. However,due to the fact that eddy current effect does exist,the baseline of the detection signal waveform is caused to be drifted,and the baseline drifting direction depends on the locations of the magneto sensors mounted in the magnetizer. The trouble of baseline drifting can be fixed by means of some software compensation and adjustment.
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