METHOD AND DEVICE FOR DETECTING FRACTURE OR CLOGGING OF OPTICAL FIBER

摘要

Fracture or clogging of a hollow optical fiber is detected without damaging the degree of freedom of the hollow optical fiber. A carbon dioxide gas laser generator (5) is connected with the inlet or the primary side of a hollow optical fiber (1) having an outlet or a secondary side connected with a hand piece (6). The carbon dioxide gas laser generator (5) is connected with a loud speaker (7) which is connected with an oscillator (8). In the hand piece (6), the hollow optical fiber (1) is connected with a secondary side microphone (9). When a hole is opened in the middle of the hollow optical fiber (1) or when the hollow optical fiber (1) is broken, acoustic power leaks from the hole in a defect portion and acoustic power transmitted to the secondary side microphone (9) attenuates extremely, therefore abnormality can be checked by means of the secondary side microphone (9).