A Size-Measure Instrument With CCD Matrix And Computer System

A size-measure instrument with the CCD matrix and computer system is designed to test the size of any shape workpiece automatically. The measurement of 2D size adopts the method of the relative measurement. Namely, we test the normal workspiece firstly and save its measure value in the EMS memory, and then we test the measured workspieces one by one and work out the size deviation. The measurement of 3D size adopts the principle of cross measurement. Namely, we can get the 3D size by the azimuth angle and the pitching angle of the measured workpiece. So the precision and the velocity are increased. More importantly, the precision can't be changed with the conditions: temperature, humidity and air pressure.The experiments show that the relative precision gets up 0.29% andthe absolute precision gets up 3.0um. The instrument may be used in the product line and make the testing on line possible.