Novel weak magnetic field sensor and detection method based on Ampere force

Abstract

The invention discloses a novel weak magnetic field sensor and a detection method based on Ampere force. Two output ends of a circulator are respectively connected with a 2*2 polarization-maintaining fiber coupler and a spectrum analyzer, the output end of the 2*2 polarization-maintaining fiber coupler is separately connected with a first polarization maintaining fiber and a second polarization maintaining fiber , the first polarization maintaining fiber and the second polarization maintaining fiber are welded in 90 degrees, a part of the first polarization maintaining fiber serves as a magnetic field induction zone, the first polarization maintaining fiber in the magnetic field induction zone and an energized electrode are wrapped by flexible materials, and the flexible materials and the energized electrode form a structure for inducting the magnetic field; the energized electrode is subjected to the magnetic field effect, generates Ampere force, and indirectly acts on the magnetic field induction zone, the polarization maintaining fibers generate stress birefringence, so that the interference light phase difference is changed and the magnitude of the magnetic field is acquired. According to the invention, the method has advantages of simple manufacture, high sensitivity, low cost, simple structure and manufacture process and the like, and the anti-interference ability of the detectable weak magnetic field and severe environment.

Description

technical field [0001] The invention relates to the field of magnetic field sensing, in particular to a novel weak magnetic field sensor and detection method based on the ampere force. Background technique [0002] Magnetic field measurement technology has important applications in geological exploration, industrial detection, military guidance, biomedical engineering and daily life. Traditional magnetic field sensing methods are often limited by many applications due to problems such as electromagnetic interference. Optical fibers, as an intrinsically insulating material, have unique advantages in magnetic field sensing. In addition to being free from electromagnetic interference, they are also light in size, small in weight, High precision, easy to form distributed measurement and other advantages. [0003] Polarization-maintaining fiber has the characteristics of polarization-maintaining and high birefringence, and the Sagnac ring formed by it has high sensitivity to str...

AI Technical Summary

Problems solved by technology

But at present, magnetostrictive materials or magnetic fluids are usually used for the effect of magnetic field on polarization-maintaining optical fibers, which are complicated to manufacture.

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