The design built an optical diameter measurement system by introducing a linear laser as target detection light source. To emphasize characteristics of target detection object

design adapt real-time change light integration time to enhance edge signal characteristics. Use programmable logic device（FPGA） as CCD driving equipment and signal processor

use sub pixel edge detection algorithm to process the one-dimensional image data

at last

the results will be displayed in real-time. Experiments show that the system can complete target detection task

and detection precision can achieve level of micron.