Opticalfiber temperature distribution measurement apparatus

摘要

The present apparatus includes: an intensity ratio calculation unit configured to calculate a first and a second intensity ratios which are ratios of Stokes light intensity to anti-Stokes light intensity obtained when a light pulse is output to a first end and a second end of an optical fiber, respectively; a temperature calculation unit configured to calculate a temperature distribution along the optical fiber based on a reference temperature, the first and the second intensity ratios, and a total length loss ratio, which is a loss ratio of Stokes light to anti-Stokes light with regard to a total length of the optical fiber; and a total length loss ratio calculation unit configured to calculate the total length loss ratio based on the first and the second intensity ratios with regard to a location in a predetermined section close to both ends of the optical fiber whose temperature is kept constant.

主权项

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.