Improvement of the optical fiber sensing technology which uses the deyuarukoa fiber

摘要

The optical fiber which is utilized to optical fiber sensing of the test sample has the 1st core (16) and the 2nd core (14). 2nd the core (14), generally, 1st the core (16) inside it is arranged in coaxial condition, 1st makes smaller size than the core. The 2nd core (14), because of non-linear optical excitation of the test sample, the laser (12) from it is possible to transmit the laser energy of pulse condition. In order to improve detection efficiency in comparison with the former shingurumodo fiber and the maruchimodo fiber, the non-linear optical feedback signal, the 1st core and is collected to the both of the 2nd core.