A Design Of Portable Non-Contacted Diameter Measurement System Based On Linear Array CCD

In recent years, along with new optoelectronic devices flowing out continuously,the capacity of MCU data processing improving, and the requirements of overall production quality management, non-contact Intelligent machines will replace the traditional mechanical instruments gradually. In this paper, I designed a set of portable non-contact measurement instruments based on linear array CCD, which can measure the workpiece fromφ0.5mm toφ30mm, with measurement precision±5μm .In this paper, I discussed the basic principle of CCD photoelectric measurement devices, analyzed the form of parts of optical system, adopt Kohler illumination and telecentric beam path design in order to ensure image quality and accuracy. Adopting differential theory extracted edge information of measured workpiece, and discussed the signal processing circuit in the realization of the various modules in detail, and made the differential processing circuitry and single-chip control system as emphases, at the same time I gave control program flow chart of CCD diameter measurement system and related parts procedures of it.Through experimental measurement results, I analyzed several important parameters, discussed several major errors which influences the accuracy of system in the end, gave the method of elimination of errors, in order to achieve higher measurement accuracy.