Interferometric full optical fiber sensor for simultaneously measuring temperature and strain based on FP-MZ structure

Abstract

The invention discloses an interferometric full optical fiber sensor for simultaneously measuring the temperature and the strain based on an FP-MZ structure. The end faces of single-mode optical fibers are corroded by adopting 40 percent hydrofluoric acid to obtain an optical fiber FP structure; tail fibers of the optical fiber FP are subjected to fusion welding by using a taper waist expansion fusion welding technology to obtain an optical fiber MZ interference structure; a sensor for simultaneously measuring the temperature and the strain is produced, temperature and strain sensing characteristics are tested and analyzed, and a mathematical model between the temperature and the strain of the system and wavelengths of a reflection spectrum and projection spectrum is established; the change of dual parameters, namely external temperature and strain can be simultaneously monitored by a sensing coefficient matrix of the system. The sensor has the advantages of simple structure, low production cost, good measuring stability, cross sensitivity to stress and temperature and higher reference value; meanwhile, the sensor has important application value in aeronautics and astronautics, biomedical detection, large-scale building health monitoring and the like; the problem that a traditional sensor only measures a single parameter is changed.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an interference type all-fiber sensor for simultaneous measurement of temperature and strain based on an FP-MZ structure. Background technique [0002] Optical fiber has been widely used in the field of sensing due to its lightness, sensitivity, strong electromagnetic interference resistance, high temperature resistance, and low signal attenuation. Optical fiber is used for sensing, can be networked, and is easy to realize intelligence. It integrates information transmission and sensing, and can effectively solve measurement problems that conventional detection technologies are not fully capable of. [0003] The basic principle of the fiber optic sensing system is that the light wave parameters in the fiber, such as light intensity, frequency, wavelength, phase and polarization state, change with the changes of the external measured parameters. Purpose. [0004] T...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides an interferometric all-fiber sensor based on the simultaneous measurement of temperature and strain based on the FP-MZ structure, which solves the problem that traditional sensors only measure a single parameter. However, the actual environment is not like a laboratory It can also control the change of a single parameter, but it cannot adapt to the problem of complex parameter changes in the real environment.

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