Patent ID: 9046425
Filing Date: 2015-06-02
Classification: G01K

Abstract:
1. An optical fiber temperature distribution measurement apparatus, comprising: a pulse output unit configured to output a light pulse to a selected one of a first end and a second end of an optical fiber; an intensity ratio calculation unit configured to calculate a first intensity ratio and a second intensity ratio, wherein the first intensity ratio is a ratio of Stokes light intensity to anti-Stokes light intensity obtained when the light pulse is output to the first end of the optical fiber, and the second intensity ratio is a ratio of Stokes light intensity to anti-Stokes light intensity obtained when the light pulse is output to the second end of the optical fiber, a reference temperature unit including a reference temperature optical fiber and a first reference thermometer configured to measure a temperature with a temperature of the reference temperature optical fiber being a reference temperature; a temperature calculation unit configured to calculate a temperature distribution along the optical fiber based on the reference temperature, the first intensity ratio, the second intensity ratio, and a total length loss ratio, wherein the total length loss ratio is a loss ratio of Stokes light intensity to anti-Stokes light intensity with regard to a total length of the optical fiber; a constant-temperature unit configured to keep a temperature of a predetermined section close to both ends of the optical fiber constant; and a total length loss ratio calculation unit configured to calculate the total length loss ratio based on the first intensity ratio and the second intensity ratio with regard to a location in the predetermined section.