US 11,914,206 B2
Computer-readable non-transitory medium, abnormality detection device and abnormality detection method
Yoichi Takasu, Isehara (JP); Takahiro Arioka, Atsugi (JP); Takeo Kasajima, Machida (JP); and Kazushi Uno, Atsugi (JP)
Assigned to Fujitsu Limited, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki (JP)
Filed on Jun. 24, 2022, as Appl. No. 17/848,799.
Claims priority of application No. 2021-160279 (JP), filed on Sep. 30, 2021.
Prior Publication US 2023/0097688 A1, Mar. 30, 2023
Int. Cl. G02B 6/44 (2006.01); G01M 11/02 (2006.01); G01H 9/00 (2006.01); H02G 1/02 (2006.01)
CPC G02B 6/4422 (2013.01) [G01H 9/004 (2013.01); G01M 11/02 (2013.01); H02G 1/02 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A computer-readable, non-transitory medium storing a program that causes a computer to execute a process, the process comprising:
acquiring a backward Rayleigh scattered light from an optical fiber composite overhead ground wire of an electrical power transmission facility, the electrical power transmission facility including a plurality of steel towers;
generating vibration information of a frequency band including each natural frequency of natural frequencies of the optical fiber composite overhead ground wire of each span of spans of the plurality of steel towers, on a basis of the backward Rayleigh scattered light; and
detecting abnormality of the electrical power transmission facility, on a basis of variation in time of an intensity of each natural frequency,
wherein each natural frequency fluctuates depending on a tension of the optical fiber composite overhead ground wire of each span, and
wherein a fundamental wave and overtones of the fundamental wave appear as each natural frequency in frequency characteristics of the optical fiber composite overhead ground wire of each span.