Parallel double M-Z optical fiber magnetic sensing device and manufacturing method thereof

Abstract

The invention discloses a parallel double M-Z optical fiber magnetic sensing device and a manufacturing method thereof. The manufacturing method comprises the following steps of: connecting a port on one side of a first optical fiber coupler with a broadband light source through a single-mode optical fiber, and connecting two ports on the other side with one end of an M-Z magnetic sensing probe and one end of a reference MZ magnetic sensing probe through single-mode optical fibers respectively; the port on one side of the second optical fiber coupler is connected with a spectrum analyzer through the single-mode optical fiber, and two ports on the other side of the second optical fiber coupler are respectively connected with the other end of the M-Z magnetic sensing probe and the other end of the reference M-Z magnetic sensing probe through the single-mode optical fibers; the M-Z magnetic sensing probe is provided with an optical fiber of an interference structure, the optical fiber of the interference structure is sleeved with a closed quartz micro-tube, the closed space between the interior of the quartz micro-tube and the exterior of the optical fiber of the interference structure is filled with magnetic fluid, and an M-Z interferometer is formed in the quartz micro-tube. The magnetofluid is injected into the M-Z optical fiber structure to measure the change of an external magnetic field, and the vernier effect generated by parallel double M-Z interference is utilized to improve the measurement sensitivity and accuracy; the manufacturing process is simple and easy to implement.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a parallel double M-Z optical fiber magnetic sensing device and a manufacturing method thereof. Background technique [0002] In recent years, magnetic field detection has been widely used in many fields such as military, aerospace, chemical micro-detection, industry and power transmission. In electromagnetic science research, magnetic field measurement can be used as an effective means to test the accuracy of electromagnetic theoretical calculations, and provide measurement values ​​for many difficult-to-calculate magnetic field environments; in the power industry, magnetic field measurement can be used for power system status detection, and magnetic field distribution measurement inside and outside electrical equipment etc.; in the field of electromagnetic compatibility, magnetic field measurement can be used to detect external electromagnetic radiation and interference of ...

AI Technical Summary

Problems solved by technology

These structures have achieved higher sensitivity in physical quantity measurement, but there are still some problems. For example, the microstructures in the optical fiber need to use laser precision processing technology and chemical corrosion microprocessing technology, and the preparation process is complicated; some structures require the use of special optical fibers. higher

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