强力输送带X光无损检测仪的研制

Development of non-destructive tester for steel cord conveyor belts

采用X光线阵探测器研制了一种强力输送带无损检测仪。介绍了X光无损检测原理,使用准直器解决了X光无损检测的散射问题,设计了多路并行数据采集电路实现了数据的高速采集。对线阵探测器像元非均一性的原因进行了探讨,对校正算法进行了研究,基于响应模型运算量小,校正效果良好提出了的三点分段校正法。实验证明,研制的检测仪对宽度为2m,运行速度为3m/s的强力输送带在线监测得到的图像空间分辨率为1.0mm×1.5mm,图像非均匀度低于2.57%,图像灰度对比度良好,0.5mm厚度钢板灰度差约为13。解决了传统的X光强力输送带无损检测仪无法实时在线监测的问题,与电磁感应原理设计的检测仪相比,监测结果具有直观、清晰等优点。

A Non-destructive Test（NDT） for steel cord conveyor belts was developed by using an X ray detector array.The principle of X-ray NDT was introduced and a collimator was used to eliminate the X-ray scattering.An acquisition circuit for multi-channel parallel data was designed to achieve real-time data acquisition.The reason for pixel non-uniformity of the linear array detector was discussed and an algorithm to correct the pixel non-uniformity was established.Then a three-segmented correction algorithm with less computation and better correction effect was proposed based on the response model.Experiments show that the spatial resolution of the image is 1.0 mm×1.5 mm and the non-uniformity of the image is below 2.57% for a steel cord conveyor belt with a width of 2 m and a speed of 3 m.Obtained image shows a good gray contrast,and its gray level difference for a 0.5 mm thick steel is about 13.The new NDT has achieved the real-time online monitoring function,and has advantages of intuitive,clear and so on compared with the tester designed by electromagnetic monitoring principles.