| 摘要 |
[Problem] To provide an abnormality detection system and an abnormality detection method which are capable of detecting abnormality at an early stage, the abnormality occurring in a facility such as a chemical plant, an oil refinery plant, or a thermal power plant. [Solving Means] An abnormality detection system includes an optical fiber 24, a Raman scattered light detection unit 20, and a data processing unit 30. The Raman scattered light detection unit 20 is configured to detect Stokes light and anti-Stokes light which are generated in the optical fiber 24 and to output data on the intensity distribution of the Stokes light in the optical fiber 24 in the length direction thereof and data on the intensity distribution of the anti-Stokes light in the optical fiber 24 in the length direction. The data processing unit 30 is configured to calculate the product of a value obtained by applying an FIR (Finite Impulse Response) filter to the intensity distribution of the Stokes light in the optical fiber 24 in the length direction, and a value obtained by applying the FIR filter to the intensity distribution of the anti-Stokes light in the optical fiber 24 in the length direction for each of locations on the optical fiber 24 in the length direction, and to determine whether or not abnormality is present based on the result of the calculation. |
