Research on Automatic Measurement Technology of Three-Dimensional Profilometry with an Improved Color Grating Projection
To measure the three-dimensional profilometry data of objects,the three-dimensional measure-ment method of fringe projection is proposed based on an improved color grating measurement,this system uses the fringe projection method to calculate the height of the work piece to be measured.Nevertheless,the dynamic range of digital projector is too wide to cover in the tiny objects,then,projector project scope is changed by the modified system,projection area is limited within about 20×20 mm.Non-uniform distribu-tion of the light field resulting from the design factors of the projector and lens can be avoided by using compensation grating images,so that the images captured by the camera can be uniform,both images with and without gratings can be clearer.In this way,more accurate 3D contouring measurement and reconstruc-tive analytical calculation can be carried out for the work piece to be measured.The measurement accuracy is 2 μm and speed is 0.024 s,experiment shows that thereby proving that this method has the advantages of high speed,high sensitivity and more effectively.