Optical fiber refractive index and temperature sensor and measurement method thereof

Abstract

The invention discloses an optical fiber refractive index and temperature sensor and a measurement method thereof. The optical fiber refractive index and temperature sensor comprises a broadband light source (1), an optical fiber sensing head (2), a spectrometer (3) and a computer (4), wherein the broadband light source (1) is connected to a first input port of the optical fiber sensing head (2) through an optical fiber; a first output port of the optical fiber sensing head (2) is connected with the spectrometer through an optical fiber. According to the measurement method, two light beams split in a Mach-Zehnder interferometer interfere with each other, the movements of the valley value wavelength and the Bragg wavelength of an interference fringe change with the refractive index or the temperature of a material to be measured where the optical fiber sensing head is positioned, the movement ranges of the valley value wavelength and the Bragg wavelength of the interference fringe are measured through the spectrometer, and the refractive index and the temperature of the material to be measured are obtained through calculation of the computer. The optical fiber refractive index and temperature sensor is capable of measuring the refractive index and the temperature in high-precision and real-time ways at the same time and is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to a refraction index and temperature sensor, in particular to an optical fiber refraction index and temperature sensor based on a Mach-Zehnder interferometer and a Bragg grating and a measuring method thereof. Background technique [0002] Refractive index and temperature are two very important parameters in the fields of physics, biology, chemistry and other disciplines, and their accurate measurement is of great significance and application in chemical industry, medicine, food and other related industries. Therefore, many methods for measuring the refractive index and temperature have been developed. Conventional methods for measuring refractive index include grazing incidence, diffraction grating, laser irradiation, and CCD measurement, as well as some new technologies such as photoacoustics, SPR sensors, and Raman spectroscopy. The traditional methods for measuring temperature include high-precision thermometer method, SMS s...

AI Technical Summary

Problems solved by technology

In the research on simultaneous measurement of dual parameters of temperature and refractive index, many new methods have emerged, such as Fabry-Perot cavity mirror method, tapered fiber method, dual-mode fiber method, etc., although the design of these methods is relatively ingenious , under certain conditions, the simultaneous measurement of temperature and refractive index can be achieved, but these methods are expensive and difficult to operate, while their stability is low, and their application range is limited

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