微细管道内壁缺陷测量系统构建和技术

为满足微细管道内部缺陷检测需要,提出了一种将外部光源导入、内部图像导出的解决新思路,基于360°全景锥镜、视像管、环形光源、近景光学镜头及高分辨率相机构建了光学信息传输部件,并与计算机共同组成机器视觉检测系统。在检测系统构建中,光学信息传输部件的姿态调整是一个关键环节,本文对此展开了深入的研究,给出了调整评判依据及完整的调整实现流程,最终构建了较为理想的微细管道内部缺陷测量系统。基于测量系统,对深100mm、孔径9mm的管道样件内壁上0.5、0.8及1.0mm的微孔模拟缺陷进行了多次测量,测量结果标准差分别为0.025、0.026及0.028mm。实验结果表明,基于本文的调整技术构建的检测系统,可以实现检测部件与待测管道的精确对准,进而实现微细管道内部缺陷的高精度测量。

A new technology of building up defect measuring system for inner mi cro-pipe

In order to satisfy the requirements of detecting inner defects on mic ro-pipes extensively existing in the industry,a new approach based on importing external light source and exporting inner image is p resented.Optical information transmission components contain 360° panoramic conic mirror,sightpipe,ring illu minator,close shot optical lens and high resolution CCD camera,which construct the machine vision detection system toge ther wit h the computer.In the process of building the detecting system,posture adjustment of optical information transmission components is a k ey point which is deeply investigated.Evaluating basis of adjustment and complete implementation processes are given.Finally,the ideal micro-pipe inner defect measuring system is built.Based on the measuring system,the sample pipe with depth of 100mm and dia me ter of 9mm,which has simulated porosity defects of 0.5mm,0.8mm and 1.0mm on the internal surface is measured repeatedly,an d the RMS errors,are less than 0.025mm,0.026mm and 0.028mm,respectively.Experimental results show that based on the detect ing system built from the research of posture adjustment technology,the accurate alignment between the detecting components a nd the pipe and high-precision measurement for defects inside the micro-pipe c an be realized.