Method for measuring temperature through fiber core mismatching interference structure

Abstract

The invention discloses a method for measuring the temperature through a fiber core mismatching interference structure. The method comprises the following steps that 1, a fiber core dislocation welding interference structure is built, wherein the fiber core dislocation welding interference structure comprises a pumping source, a wavelength division multiplexer, a gain optical fiber, a first single-mode optical fiber, a second single-mode optical fiber, a third single-mode optical fiber and an optical spectrum analyzer which are sequentially connected; 2, fiber core dislocation welding is conducted on the first single-mode optical fiber, the second single-mode optical fiber and the third single-mode optical fiber; 3, the outside temperature of a temperature control device to be measured is measured, wherein the first single-mode optical fiber, the second single-mode optical fiber, the third single-mode optical fiber and the temperature control device are combined into a whole, the moving length of a comb-shaped spectrum is recorded according to the changes of wavelength values of the wave trough at the different temperatures to obtain a changing curve of the comb-shaped spectrum along with the temperature, the wavelength of a measuring point is selected, the optical spectrum wavelength curve drifts at the moment, and the outside temperature can be deduced according to the drift distance through the following formula of Y=aX-b, wherein X represents the temperature, Y represents the changing wavelength, and a and b represent constants.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method for measuring temperature by using a fiber core mismatch interference structure. Background technique [0002] The all-fiber sensor has the advantages of compact structure, long service life, sensitivity to test volume, and multiple transmission channels, and is widely used in optical fiber sensing, optical fiber communication, optical processing and other fields. Through the micro-machining technology of the fiber end face or building an all-fiber sensor with an interference structure, under the action of the pump source, an interference spectrum curve with a comb-like spectrum pattern is output. The thin-core optical fiber Mach-Zehnder optical fiber sensor has a simple structure and is easy to implement. The structure consists of a thin-core optical fiber welded to two relatively thick core-diameter doped rare-earth optical fibers. The doped rare-earth optical fibe...

AI Technical Summary

Problems solved by technology

However, these fiber optic sensors have shortcomings, which are limited in practical application.

Images