INSPECTING METHOD FOR CUT SECTION OF OPTICAL FIBER

摘要

PURPOSE:To easily identify the condition of the cut section and an optical fiber, by detecting the acoustic emission produced when the optical fiber is cut with a sensor. CONSTITUTION:After an optical fiber (not shown in the figure) is set on a plate spring 1 or optical fiber guiding plate 7, a fine streak is formed in the surface of the fiber with an edge 2. Then the optical fiber is cut by giving a bending stration to the fiber by bending the plate sprint 1. Since the stress- strain energy is released at the moment when the optical fiber is cut, an acoustic pulse (acoustic emission) is produced at the time of destruction. The acoustic pulse is detected with a sensor 8 and observed by means of an oscilloscope 10 through an amplifier 9. Since the acoustic emission is continuously observed for a period of about three seconds when the cut section becomes a flat perpendicular face, the cut condition can be identified easily.