Abnormality detection system and abnormality detection method

摘要

An abnormality detection system includes an optical fiber, a backscattered light detection unit, and a data processing unit. The detection unit is connected to one end and the other end of the optical fiber and configured to acquire a first intensity distribution of backscattered light by causing light to enter the optical fiber from the one end, and to acquire a second intensity distribution of backscattered light by causing light to enter the optical fiber from the other end. The processing unit is configured to calculate the product of a value obtained by applying a first FIR filter to the first intensity distribution, and a value obtained by applying a second FIR filter to the second intensity distribution, for each of locations on the optical fiber in the length direction thereof, and to determine whether or not abnormality is present based on the result of the calculation.

主权项

1. An abnormality detection system comprising:
an optical fiber; a backscattered light detection unit connected to one end and another end of the optical fiber and configured to acquire a first intensity distribution of backscattered light by causing light to enter the optical fiber from the one end, and to acquire a second intensity distribution of backscattered light by causing light to enter the optical fiber from the other end; and a data processing unit configured to calculate a product of a value obtained by applying a first FIR (Finite Impulse Response) filter to the first intensity distribution acquired by the backscattered light detection unit, and a value obtained by applying a second FIR filter to the second intensity distribution acquired by the backscattered light detection unit, for each of locations on the optical fiber in a length direction of the optical fiber, and to determine whether or not abnormality is present based on a result of the calculation.