A new optical fiber sensor with 2 light beams is developped for detecting variation of scattered light distribution caused by surface defects, like flaws, surface inferiority, etc. Its feature consists in compact structure using only light transmission characteristic proper to the optical fiber, using no optical components like a lens. High response speed of maximum 2m/s is suited to purpose of non con- tact in-process or in-line defect detection and with automation of inspection process performed in the past visual or sampling method, the stabilization of inspection level is achieved and inspection eff i- ciency is improved by introduction of this sensor. In this paper, the principle of surface defect detection with the optical fiber sensor and the quantification of surface properties by conversion of detection output into arithmetical mean deviation are described, and the system structure on representative examples of practical application in actual inspection process is explained.

Date Published: 1 January 1991
PDF: 11 pages
Proc. SPIE 1332, Optical Testing and Metrology III: Recent Advances in Industrial Optical Inspection, (1 January 1991); doi: 10.1117/12.51087

Published in SPIE Proceedings Vol. 1332:
Optical Testing and Metrology III: Recent Advances in Industrial Optical Inspection
Chander Prakash Grover, Editor(s)