The Study Of Positon Precision In Optical CCD Non-Contacted 2-D Measure Instrument

Measurement with CCD is a very effective non-contacted method for the dimensional measure, which is now widely applied to the precision measure of the part dimension. In this thesis, a measure device for the part dimension was designed by means of matrix CCD as sensor and the sub-pixel position of picture of the part dimension was realized. The application of matrix CCD to high precision measure was explored and discussed, which laying the foundation of the precision measure of matrix CCD for complex parts. This device is the alteration of an old universal tool microscope in our lab, which consists of a CCD picture sensor, an optical grating sensor, an optical image formation system, a data capture system, a picture capture system, and an optical CCD non-contacted two-dimensional measurement consisting of computer and interrelated mechanical structure. The main content of the thesis is as follows: the theory of picture measurement and the system design; the optical image formation and picture capture system. The measure position precision of part's edge was discussed. The picture sub-pixel edge was detected, which processed the part picture and obtained high position precision of the picture edge.In the part of theory, several common computational algorithms of the sub-pixel edge measurement were discussed, and the method of the polynomial interpolation for sub-pixel edge measure was also studied. It specialized several methods of making simulation pictures, checked the method of polynomial interpolation for edge measure using the simulation pictures and the experimental imageries, and analyzed the precision measurement of industry. This technology has large practical value and wide application prospect.