Size Measurement System With Structured Light Based On Machine Vision

As the automatic and intelligent level has being enhanced in Chinesemanufacturing industry, enterprise pay more and more attention not only to theproduction process, but also to the quality of products. Nowadays the coiling process ofmagnetic coils is monitored by manual work, which is of low efficiency and lowreliability and high production costs. And it goes against the development of theenterprise obviously. According to this, this paper studies a non-contact measuringsystem that based on machine vision and the structure light sensor. The measuringsystem can do online size measurement rapidly, efficiently and stably, and realize theautomation of the coiling process in theory. The main contents of this thesis aresummarized as follow:1．It introduces the software and hardware composition of the measurementsystem in this thesis. And the technical route has been analyzed, which contains theproblems need to be solved over the course of the study, such as the calibration of visualsystem, the structured light sensor design and the image processing method.2．The thesis studies the calibration method of the visual system. We calibrate thecamera by using Zhang’s linear calibration method for the nonlinear model camera.Based on the principle of laser triangulation, the mathematical model of structured lightsensor has been analyzed, and a structured light sensor has been designed for theexperimental environment. The image processing method for laser beam also has beenstudied. According to the characteristics of the laser beam from experiment, the centerextraction of the laser beam has been designed.3．This thesis introduces the experimental process and analyzes the experimentaldata, from which we get the reasonable measurement accuracy of the system. And theconclusion is that the system can meet the requirement of the measurement accuracy.However, the thesis has just finished the basic technology of the magnetic coilcoiling monitoring research. And we need to further improve the system to realize theautomatic monitoring of the magnetic coil coiling process and adapt to complexmeasurement environment in future.