Contour Measuring System Based On Laser Interferometry

With the rapid development of computer technology,part contour measurement technique ushers in the golden age of development.Nowadays,parts contour measurement technique has been widely used in various of industrial manufacturing domains,such as automatic manufacturing,processing parts quality testing and mold design.At present,many researches have been carried out in the field of 3D contour measurement both domestic and abroad.At the same time,plenty of 3D contour measurement schemes have been proposed.However,some existing three-dimensional contour measurement systems still fails to measure fine structure of parts well in a precision measurement.In this paper,based on the analysis of the principle of laser interferometry,a contour measurement system is developed to solve the above problems,which is composed of an integrated optical fiber coherence sensor,an optical interference ranging acquisition terminal,a two-dimensional motion platform and a host computer.The hardware design of each component from this system is discussed.On the basis of LabVIEW software platform,a contour measurement system software is built to measure the distance and coordinate the motion of measured part,which also is capable of system initializing,data storage and so on.The location information of all measuring points from plane,which can be used to restore its original contour,will be saved by this contour measurement system.After measuring some typical components,the measured dimensional accuracy can reach to ±0.005 mm.It turns out that the contour measurement system can measure the target component's profile with a relatively high measurement precision.Besides,owing to adopting the modular ideas,additional functions can be easily expanded into this system.