STUDY ON APPLICATION OF OPTICAL FIBER MEASUREMENT FOR MAINTENANCE AT HANEDA AIRPORT D-RUNWAY

Abstract

 During the construction of Runway D at Haneda Airport, strain gages and fiber-optic instruments were installed on 15 steel pipe piles, and the results of these measurements have been utilized for maintenance.It has been about 16 years since the installation of them, and it is important to continuously utilize the long-life fiber-optic measurement for continued maintenance. The authors conducted Rayleigh backscattering measurements in addition to conventional Brillouin backscattering measurements with currently installed optical fibers, and ensured that Rayleigh measurement is an effective measurement method for maintenance. In addition, since fiber optic measurement is not a temperature-compensated measurement method, the evaluation of measurement results in sections with temperature changes has been a problem so far. To overcome this problem, they ensured the effectiveness of a temperature compensation method based on the results of both measurement methods with currently installed optical fibers.