Image Technology in Dimension Measurement of High Temperature Parts

摘要

Color CCD and infrared filter are adopted to establish a measurement system of hot parts, whose images are improved by combination of digital and physical filtering technologies proposed in this paper. And then comparison measurement method is utilized to derive the two-dimensional size of the hot pieces precisely, which needs to calibrate the equivalent size of pixels in image accurately. So images of standard gauge blocks are captured and then processed to obtain the distance expressed in terms of pixels. As be verified by other gauge blocks, the horizontal measurement uncertainty is 0.0051mm, while vertical 0.0087mm. Finally, images of a 45# steel cuboid at 1000 degrees C are captured and its dimensions are calculated through the procedure, which has a difference less than 0.5mm compared with the theoretical values, indicating the precision and practicality of the method proposed in this paper.