A double-d-type optical fiber weak magnetic field sensor with a double helix structure and its manufacturing method

Abstract

The invention relates to a double-D type optical fiber weak magnetic field sensor with a double helix structure and a manufacturing method thereof, belonging to the field of optical fibers. The present invention adopts two-photon femtosecond laser direct writing technology, and establishes a 3D printing model according to the refractive index of the material and the geometric shape of the double helix structure. The cross section of the double helix structure is circular. The position and outline of the structure, and then use the first material to print the 1 / 2 circle of the circular cross section in the double helix structure. After printing, the excess material is cleaned, and the second material is printed as the entire circle by using the two-photon laser direct writing device again. The other 1 / 2 of the shaped section, after printing, clean the excess material. Compared with the existing magnetic field sensors, the double D-type optical fiber weak magnetic field sensor with double helix structure proposed by the present invention has the advantages of easy operation, fast speed, high precision and high success rate, and has a good performance in the field of magnetic field measurement. application prospects.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a double-D type optical fiber weak magnetic field sensor with a double helix structure and a manufacturing method thereof. Background technique [0002] Optical fibers with special functions other than conventional communication optical fibers are usually called "special optical fibers". Compared with traditional communication optical fibers, special optical fibers have unique designs in terms of structure, material and manufacturing methods to meet various special purposes. Such as sensing applications. For example, based on the Sagnac effect, the polarization-maintaining fiber is used in the fiber optic gyroscope; based on the Faraday effect, the magneto-optic fiber is used in the magnetic field sensor; based on the optical coherence technology, the bending-resistant fiber is used in the fiber optic hydrophone; Mode optical fiber is used for optical fiber temperature sensor etc. ...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the existing multi-material core double-D special optical fiber cannot achieve multi-material uniform printing inside the hollow fiber through the traditional two-photon femtosecond laser direct writing 3D printing technology, and the magnetic field information of the traditional sagnac sensor is submerged in the angular velocity information Medium problem, the present invention proposes a double-helix structure double-D optical fiber weak magnetic field sensor and its manufacturing method. The magnetic field sensor is based on multi-material two-photon femtosecond laser direct writing technology.

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