Photonic crystal fiber current magnetic field sensor and manufacturing and measuring method thereof

Abstract

The invention discloses a photonic crystal fiber current magnetic field sensor and a manufacturing and measuring method of the photonic crystal fiber current magnetic field sensor. At the time of manufacturing, a small segment of a photonic crystal fiber is welded between two single-mode fibers first; due to the fact that a part of air holes in the photonic crystal fiber are collapsed at the time of welding, when light is transmitted to the photonic crystal fiber, transmission between a decoring mode and a cladding mode is stimulated to form mode interference; then, the photonic crystal fiber, the single-mode fibers and an electric wire are straightened, the two single-mode fibers are bonded to the electric wire, and the electric wire is fixed on a fixture to manufacture the current magnetic field sensor. At the time of measuring, direct currents are connected into the electric wire, a magnetic field is added in the direction perpendicular to the electric wire, and therefore the electric wire drives the photonic crystal fiber to bend under the action of Ampere force. Due to the fact that the cladding mode of the photonic crystal fiber is quite sensitive to bending, interference fringes detected by a spectrograph will change obviously along with the change in the impressed currents and the external magnetic field, and sensing detection of the currents and the magnetic field is realized.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to the research and preparation of optical fiber sensors. More specifically, a photonic crystal fiber current and magnetic field sensor is prepared by using the Ampere force to bend the wire to drive the photonic crystal fiber. Background technique [0002] Optical fiber sensing is a new technology that came out in the 1970s. It is a sensing technology that uses light as the information carrier and optical fiber as the information transmission medium. Compared with traditional sensors, optical fiber sensors have the advantages of small size, light weight, no electromagnetic interference, and high sensitivity. Since the advent of low-loss optical fibers in the 1970s, it has gradually become one of the research and development directions of new-generation sensors. A very good application prospect. In the past ten years, with the advancement of science and technology and the ...

AI Technical Summary

Problems solved by technology

Due to the shortcomings of traditional current and magnetic field sensors, such as large volume and weight, susceptibility to electromagnetic interference, and difficulty in integrating with optical communication networks, the development and application of new fiber optic current and magnetic field sensors has become a hot spot in the world today and has an irreplaceable role.

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