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Magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof

A technology of magnetic induction intensity and sensing head, which is applied in the use of magneto-optical equipment for magnetic field measurement, the size/direction of the magnetic field, etc., can solve the problems of optical fiber temperature sensitivity restricting the development, temperature troubles fiber grating FPI sensor, etc., to achieve high Effects of sensitivity, noise reduction, and measurement accuracy improvement

Inactive Publication Date: 2009-12-09
JIANGSU YAWEI TRANSFORMER +1
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Problems solved by technology

Since the light propagates in the fiber, the loss is very small, and it is easy to be an all-fiber structure, but the temperature sensitivity of the fiber itself restricts its development.
Fiber Bragg Grating FPI is composed of two identical Fiber Bragg Gratings (hereinafter abbreviated as FBG) written in the same optical fiber. It is easy to make, but the influence of temperature is always the biggest problem that plagues Fiber Bragg Grating FPI sensors.

Method used

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  • Magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof
  • Magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof
  • Magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof

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Embodiment Construction

[0022] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0023] See attached figure 1 , is the fiber grating FPI magnetic induction intensity sensor probe. The fiber grating F-P cavity is pasted on the magnetostrictive material 2, the permanent magnet 3 is fixed on both sides of the magnetostrictive material 2 in parallel, two sets of coils 4 are placed at both ends of the magnetostrictive material 2, and the high-frequency alternating current is loaded for the measuring device magnetic field.

[0024] See attached figure 2 , is a schematic diagram of the structure of the magnetic induction intensity measurement device based on the fiber Bragg grating FPI. attached figure 1 The fiber grating FPI1 of the middle sensor probe is connected to one port on one side of the fiber coupler 9 through the single-mode fiber 6, and the other port is connected to the refractive index matching liquid 11, and the two ports on the ...

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Abstract

The invention relates to a magnetic induction intensity sensing head and a magnetic induction intensity measurement method and a device thereof; and the invention is characterized in that a magnetic field sensing head is placed in a magnetic field to be measured, and a fiber bragg grating FPI adhered on magnetostrictive materials senses ambient temperature, offset magnetic field, modulated magnetic field and the magnetic field to be measured. A light signal emitted by a monochromatic light source enters fiber bragg grating F-P cavity and forms a similar two beam interference signal after interference to be output. Cavity length variation amount of the fiber bragg grating F-P cavity is obtained according to the two beam interference signal, and measurement value is obtained according to linear relation of the cavity length variation amount and magnetic field intensity. And finally, compensation relation between the magnetic field intensity measurement value and actual value to be measured on temperature and relation of the magnetic filed intensity and the magnetic induction intensity are utilized to obtain actual value of the magnetic induction intensity. The invention can measure both direct current magnetic field and alternate current magnetic field and has higher sensibility of measurement towards a weaker magnetic field.

Description

technical field [0001] The invention relates to a magnetic induction intensity sensor head, a magnetic induction intensity measurement method and a device thereof, and belongs to the field of optical fiber sensing and optical measurement. Background technique [0002] Magnetic field measurement is of great significance in the fields of national defense, industry and medicine. The main applications are magnetic mine clearance, weapon search, magnetic navigation, submarine detection, current measurement, mineral detection and medical instruments. For weak magnetic fields (<10 -8 There are many kinds of sensors for T), such as: fluxgate magnetometer, optical pump magnetometer and superconducting quantum interference device. Among them, the superconducting quantum interference device is the most sensitive magnetic field sensor known, with a resolution of up to 10 -14 T above, but because the system needs to work at the temperature of liquid nitrogen, the structure is compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
Inventor 赵建林吕全超姜碧强
Owner JIANGSU YAWEI TRANSFORMER
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