Precision Measurement Method Of Pipe Diameter Based On Linear Array Camera

This research will provide simple,easy,fast and low-cost and real time laser alignment model to measure the pipe line diameter with the handheld laser,camera,projector and the personal computer as hardware.Based on the experimental results,this approach will play a great role in academic research and in different research area that deals with the straight pipes in their everyday life.Moreover,the measurement techniques can achieve total online measurement and it provides high precision and stability.In addition,we present a novel method to measure the diameter of straight and seamless plastic pipes.A pair of line-structured lasers,which locate on different sides of the pipe but in a common plane,cast on the pipe to create two elliptical arcs.The CCD camera captures these two arcs.Major and minor axis radii and spatial 3D coordinates of every corresponding elliptical cross-section center can be calculated through ellipse fitting.A pair of line-structured laser sensors,each of which includes a line-structured laser and a CCD camera,are placed at every sampling cross section of the pipe,and thus the pipe's cross-section diameter and furthermore the straightness of the pipe can be solved.We provide an on-line machine vision method for measuring a seamless steel pipe's diameter and straightness,including the design of the system,the deduction of the mathematical model,and the research of the experimental results.