Magnetic field sensor and measurement method based on fiber Bragg grating laser

A technology of magnetic field sensor and optical fiber grating, which is applied in the direction of magnetic field measurement, magnetic field size/direction and other directions using magneto-optical equipment. Detection effect

Inactive Publication Date: 2013-04-17
JINAN UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a magnetic field sensor based on a fiber grating laser. The designed sensor is small and flexible, and is especially suitable for applications that require point measurement. It solves the problem that the existing magnetic field sensors are large in size and difficult

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  • Magnetic field sensor and measurement method based on fiber Bragg grating laser
  • Magnetic field sensor and measurement method based on fiber Bragg grating laser
  • Magnetic field sensor and measurement method based on fiber Bragg grating laser

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Embodiment

[0022] Such as figure 1 As shown, the present invention includes fiber grating laser 101, wavelength division multiplexer 105, isolator 107, polarization controller 108, polarizer 109 and photodetector 110 connected in sequence, and the Pumping light source 106, pumping light source 106 produces the light 112 that wavelength is 980 nanometers, and what transmit between isolator 107 and wavelength division multiplexer 105 is the light 113 that wavelength is 1550 nanometers; Described fiber grating laser 101 places In the axial magnetic field 102 to be measured. The fiber grating laser is a short-cavity fiber grating laser produced by conventional techniques on rare earth element-doped fibers. Due to the linear birefringence caused by factors such as the non-ideal circular shape of the fiber, the short-cavity fiber grating laser itself will produce the same The two polarization states of a longitudinal mode are orthogonal to the laser output, and there is a certain difference i...

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Abstract

The invention discloses a magnetic field sensor and a measurement method based on a fiber Bragg grating laser. The magnetic field sensor comprises the fiber Bragg grating laser, a polarizer and a photoelectric detector, which are sequentially connected, wherein linear birefringence which is generated in the laser cavity of the fiber Bragg grating laser is combined with circular birefringence caused by a magnetic field to be measured to form elliptical birefringence; the fiber Bragg grating laser works in a single-longitudinal-mode double-cross-polarization state to generate two laser outputs which belong to a longitudinal mode, have frequency difference and are crossed in a polarization state; the two laser outputs pass through the polarizer, and are input into the photoelectric detector and then mixed to generate a beat frequency signal; and by detecting the frequency change of the beat frequency signal, the change of the elliptical birefringence is calculated, and then the magnetic field intensity of the magnetic field to be measured is computed. The invention has the characteristics of small size and flexibility, and is particularly applicable to an application occasion where the point measurement is required. The problems that the conventional magnetic field sensor is large in size and difficult to apply to the application occasion where the point measurement is required are solved.

Description

technical field [0001] The invention relates to fiber optical measurement of magnetic field, in particular to a magnetic field sensor and a measurement method based on a fiber grating laser. Background technique [0002] Fiber Bragg Grating is made by using the photosensitivity of doped fiber, and the refractive index of the fiber is permanently changed by special light irradiation. The fiber grating can reflect the incident light that satisfies the Bragg reflection condition, which is equivalent to directly writing a wavelength-selective reflector inside the optical fiber. Sensors made of fiber gratings have the advantages of small size, light weight, and high signal-to-noise ratio. However, most of these sensors use wavelength shift detection, which is complex and expensive, and the detection resolution and dynamic range are limited by the detection device. [0003] In terms of optical fiber optic measurement of magnetic field, it can be divided into direct measurement a...

Claims

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Application Information

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IPC IPC(8): G01R33/032
Inventor 程凌浩金龙关柏鸥韩建磊郭贞贞
Owner JINAN UNIVERSITY
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