Method of computer digital image processing was utilized to measure non-circularity of single mode fiber. The two end faces were polished, the faces come into plane, and which are perpendicular to fiber axis. Laser beam was thrown on one end of the fiber, and an inerratic spot was formed from light beam put out at another end of the fiber. The spot was shot by a digital camera with 5.1x10⁶ pixels. The image was processed with a computer. The process includes full color picture being translated into gray one, contrast enhancement, median filtering, and picking-up contour line. The every different three points on the contour line were taken out to determine one circular radius, average of many radiuses was calculated, The maximum radius and the minimum radius are picked out to calculate the fiber no-circularity in according to definition. Visual C++ and Matlab were used to programme. The results of experiment show that measurement precision is independent of the sampling number, but dependence of gray value, and average standard deviation is about 0.03%.

Date Published: 2 February 2009
PDF: 5 pages
Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 716006 (2 February 2009); doi: 10.1117/12.805642

Published in SPIE Proceedings Vol. 7160:
2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications
Shenghua Ye; Guangjun Zhang; Jun Ni, Editor(s)