论文部分内容阅读
在通过式涡流探伤中,工件抖动对探伤结果影响很大,尤其在高速探伤时,这种因抖动而引起的噪声达到了不可容忍的程度。抖动噪声是由于通常的激励线圈所产生的高频场沿径向分布不均匀和抖动引起的工件瞬时偏心而引起的。 文章指出了抖动噪声的三个电气特征,并根据抖动噪声的基理分析,提出解决抖动噪声问题应从设计磁场沿径向分布相对均匀的激励线圈入手,加大长径比和多线圈补偿都可以获得比较理想的场分布。 实践证明,我们所研制的通过式探头,对现场抖动噪声的抑制效果是比较理想的。
In eddy current flaw detection, the workpiece jitter on the test results have a great impact, especially in high-speed inspection, the noise caused by jitter has reached intolerable extent. Dithering noise is caused by the instantaneous eccentricity of the workpiece caused by uneven radial distribution and jitter of the high-frequency field generated by the usual excitation coil. The article points out the three electrical characteristics of jitter noise. According to the fundamental analysis of jitter noise, it is suggested that the solution of jitter noise should start with the excitation coil with a relatively uniform radial distribution along the design magnetic field. As the aspect ratio and multi-coil compensation can be increased, Get the ideal field distribution. Practice has proved that we have developed through the probe, the suppression of the scene jitter noise is more ideal.