| Aimed at features and difficulties with the bore measurement of hole parts in the industry presently, this paper has presented the research of photoelectric measuring system for compensating brake master of cars (the diameter from 0.3 to1.2mm) on the basis of CCD imaging technology, pattern displacement sensor, precision machinery technique, computer real-time control and data processing technology. This system has realized the non-contact measurement including size-position, edge chamfer of compensating hole and the inner surface machining quality of cylinder hole. Compared with traditional measuring apparatus, this measuring apparatus has characteristics with simple operating, fine accuracy, high automated level and etc, achieved man-machine interactive, and reduced the effect of subjective factor.This paper has described the basic function and qualification of the compensating brake master cylinder admeasuring apparatus firstly, given an introduction of gross structure, measuring principle and method, put its emphasis on the dissertation of working principle of main composing parts, such as endoscopic-micro optical system, CCD pick up camera and precision machinery system, and on the design of optical imaging system. It has analyzed the main error and the influence on measuring accuracy as well as giving a conclusion of error analysis.Experimental results has indicated, working performance of the system is stable and reliable, the measurement of the aperture has met the requirements of the accuracy 0.03% FS , the resolution 0.005 mm and repeatability 0.01 mm.
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