Temperature sensing method and device based on double-core optical fiber

The invention discloses a temperature sensing method and device based on a double-core optical fiber. The existing optical fiber sensing technology has the disadvantages of small temperature measuring range, high demodulation cost and the like. The device disclosed by the invention is characterized in that the output port of a broadband light source is in optical fiber connection with the input port of a single-mode optical fiber section; the output port of the single-mode optical fiber section is connected with the input port of a double-core optical fiber; the output port of the double-coreoptical fiber is connected with the input port of another single-mode optical fiber section; and the output port of the single-mode optical fiber is in optical fiber connection with the input port ofan optical spectrum analyzer. The method disclosed by the invention is implemented by placing the double-core optical fiber in a measurement environment, and determining the temperature exerted on the double-core optical fiber