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High-sensitivity optical fiber magnetic field sensor based on optical vernier effect

A magnetic field sensor and vernier effect technology, applied in the field of magnetic field sensing, can solve the problems of low sensitivity and large volume, and achieve the effects of improving sensitivity, overcoming high power consumption, accurate and fast response

Active Publication Date: 2021-12-17
CHONGQING UNIV
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Problems solved by technology

[0004] The invention provides a high-sensitivity optical fiber magnetic field sensor based on the optical vernier effect to solve the problems of low sensitivity and large volume of traditional optical fiber interference magnetic field sensors

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  • High-sensitivity optical fiber magnetic field sensor based on optical vernier effect
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  • High-sensitivity optical fiber magnetic field sensor based on optical vernier effect

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Embodiment Construction

[0020] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

[0021] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0022] see figure 1 , is a ...

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Abstract

The invention provides a high-sensitivity optical fiber magnetic field sensor based on an optical vernier effect. An output end of a broadband light source in the sensor is connected with a first end of a single-mode optical fiber, a second end of the single-mode optical fiber is connected with a spectrum analyzer, the single-mode optical fiber comprises a first tapering section and a second tapering section which are located between the first end and the second end of the single-mode optical fiber, the first tapering section is arranged in a first capillary tube in a penetrating mode, the two ends, which are aligned with the first capillary tube, of the first tapering section are closed, the first capillary tube is filled with air, the second tapering section is arranged in the second capillary tube in a penetrating mode, the two ends, which are aligned with the second capillary tube, of the second tapering section are closed, the second capillary tube is filled with magnetic fluid, a reference MZI Mach-Zehnder interferometer is formed by the first capillary tube, the first tapering section in the first capillary tube and air, and a sensing MZI is formed by the second capillary tube, the second tapering section in the second capillary tube and the magnetic fluid. The sensor can improve the magnetic field measurement sensitivity and is simple in structure and small in size.

Description

technical field [0001] The invention belongs to the field of magnetic field sensing, in particular to a high-sensitivity optical fiber magnetic field sensor based on the optical cursor effect. Background technique [0002] As an objectively existing substance, the magnetic field contains very rich physical information, and its precise measurement can obtain the physical characteristics of the substance to be measured. In the fields of power system, marine environmental survey, industrial production and other fields, the measurement of magnetic field and temperature is particularly important. For example, in the field of industrial manufacturing, when there is a defect inside the material, the surrounding magnetic field will change slightly, and the size and position of the defect can be inferred by precisely measuring the weak magnetic field change. In the field of geomagnetic measurement, through the abnormal monitoring of the geomagnetic field, earthquakes can be predicte...

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/032Y02A90/30
Inventor 邓明谷三峰张天衡牛洋洋邓舒丹
Owner CHONGQING UNIV
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