Peanut-shape structure-based refractive index sensor of Mach-Zehnder interferometer

Abstract

The invention provides a peanut-shape structure-based refractive index sensor of a Mach-Zehnder interferometer. The peanut-shape structure-based refractive index sensor of the Mach-Zehnder interferometer is characterized by consisting of an incidence optical fiber (1), a first peanut-shape structure (2), a connection optical fiber (3), a second peanut-shape structure (4) and an emergent optical fiber (5), wherein two ends of the first peanut-shape structure (2) are respectively connected with the incidence optical fiber (1) and the connection optical fiber (3); two ends of the second peanut-shape structure (4) are respectively connected with the connection optical fiber (3) and the emergent optical fiber (5); the two peanut-shape structures (2) and (4) are connected through a section of the connection optical fiber (3); and the two peanut-shape structures (2) and (4) and the connection optical fiber (3) form a full-optical fiber Mach-Zehnder interferometer. The peanut-shape structure-based refractive index sensor of the Mach-Zehnder interferometer is high in sensitivity, simple to manufacture, low in cost and tiny in structure, and can be applied to various practical projects.

Description

technical field [0001] The invention provides a refractive index sensor based on a Peanut-Shape Structure Mach-Zehnder Interferometer (Mach-Zehnder Interferometer), which belongs to the technical field of optical fiber sensing. Background technique [0002] Mach-Zehnder interferometers are widely used in the field of sensing. It is made using the principle of double-beam interference. The traditional Mach-Zehnder interferometer is composed of a monochromatic laser, two couplers, two ordinary single-mode optical fibers and a spectrometer. The coherent light emitted by the laser enters two single-mode optical fibers of the same length through a coupler. One optical fiber is placed in the test environment as a sensor to sense the change of a certain physical quantity, and the other optical fiber is used as a reference arm. Fix it, and then use another coupler to make the two beams of light with different optical path differences in the sensing arm and the reference arm interf...

AI Technical Summary

Problems solved by technology

[0003] Since the interference arm of the traditional optical fiber Mach-Zehnder interferometer is composed of two single-mode optical fibers, and the two interference arms are required to be fixed in the corresponding physical environment, they should not be affected by temperature, humidity, etc. except for the physical quantities that need to be measured. and other physical quantities, while the two interfering arms in the interferometer must be exactly the same length, a slight difference will affect the measurement accuracy of the interferometer

Therefore, the traditional Mach-Zehnder interferometer is difficult to manufacture and has poor stability

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