STUDY OF AUTOFOCUSSING SYSTEM IN AUTOMATIC MEASURING OF OPTICAL FIBRE GEOMETRICAL PARAMETERS
Yan Fuqiang;Zhao Ronghua(Box 128,Beijing University of Post and Teleceremunication, Beijing 100088)
The most important point in measuring optical fibre geometrical parameters by near-field method is to adjust the optical system to obtain good near-field image. To automate this kind of system,the key is how to decide whether the image is clear or not. Then the closed feedback system of automatic adjusting can be designed. We propose information entropy discrimination function which can judge the image quality. After that we developed automatic measuring system of optical fibre geometrical parameters which can realize auto focussing and automatic measuring.
【CateGory Index】： TN25