Design of CCD High Speed Wire diameter Measurement Simulation System

Abstract

Abstract: A high precision wire diameter measurement simulation
system is designed, which is composed of parallel light source, double telecentric lens, CCD camera and
object to be tested. Considering that this experimental system is designed to simulate the photography
and measurement of high-speed wire, the radial velocity of wire rod can be as high as 100 m/s in the
rolling process, and there are signs of transverse runout. Therefore, in the optical design,
a telecentric lens with a fixed magnification rate is used to keep the image size on photosensitive
surface unchanged when the distance is changed. Moreover, the maximum exposure time of the selected
plane array CCD can reach 1$\mu$s, thus a high-definition image reflecting the size of the measured
object can be obtained in real-time. The experimental results show that the diameter accuracy of
the workpiece measured by the simulation system can reach 20 um, which can meet the needs of production.

Key words: double telecentric lens, machine vision, plane array CCD camera, high speed wire

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