Fiber optic connector ferrule inner hole measurement system based on machine vision

CHEN Xiao-yuan1， CHEN Biao2
（1. College of Education Science and Technology， Zhejiang University of Technology， Hangzhou 310023， China；
2. Department of Optical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract：Aiming at measuring fiber optic connector ferrule inner hole parameters， a scheme based on machine vision scheme was adopted. Firstly， the inner hole image was acquired by using a high definition camera and microscope， and then it was processed to calculate the hole diameter and roundness. Related hardware and software were designed properly to realize the swift and automatic non-contact measurement system. A novel method was presented to locate the edge points， with eliminating the interference aroused by light intensity fluctuation. The implemented paremeter measuring algorithm was also presented. The experimental results show that the whole instrument system accuracy approaches sub-micron， and the system remains robustic to the variation of the light intensity.
Key words： fiber optic connector ferrule；hole diameter measurement；machine vision；edge detection；circle detection