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Device and method for measuring magnetic induction intensity based on colossal magnetoresistance effect

A technology of magnetic induction intensity and colossal magneto-resistance, which can be used in measurement devices, measurement of magnetic variables, instruments, etc., can solve the problem that GMR materials are not large enough, and achieve the improvement of measurement accuracy and precision, high sensitivity, and calculation accuracy. The effect of precision

Active Publication Date: 2012-12-05
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The MR of magnetic and non-magnetic metal multilayer films is generally around 10, which is called the giant magnetoresistance effect (GMR). In recent years, the giant magnetoresistance effect has been widely used in computer disks, CNC machine tools, etc., but the fly in the ointment is the The MR of the material is not large enough

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  • Device and method for measuring magnetic induction intensity based on colossal magnetoresistance effect
  • Device and method for measuring magnetic induction intensity based on colossal magnetoresistance effect
  • Device and method for measuring magnetic induction intensity based on colossal magnetoresistance effect

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Embodiment Construction

[0033] Best practice:

[0034] The magnetic induction intensity measuring device based on the colossal magnetoresistance effect includes an electromagnetic shielding device, a first loop and a second loop. Refer to attached figure 1 , the first loop includes a giant magnetoresistance device LaCaMnO, a Helmholtz coil and a first power supply unit U1, the giant magnetoresistance device LaCaMnO is placed at the midpoint of the Helmholtz coil axis, and the Helmholtz The Holtz coil is connected to U1 via K1 to form a first loop; wherein, the colossal magnetoresistance device includes La 0.7 R 0.3 MnO 3 doped rare earth manganese oxide films, which were deposited on Al by pulsed laser sputtering 2 o 3 Prepared on the substrate; the Helmholtz coil is a pair of identical circular coils, parallel to each other and coaxial, and the distance between the coils is equal to the coil radius r.

[0035] Refer to attached figure 2 , the second loop includes a Huygens bridge and a secon...

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Abstract

The invention refers to a device and method for measuring magnetic induction intensity, especially to a device and method for measuring magnetic induction intensity based on the colossal magnetoresistive effect. The device includes an electromagnetic shielding device, a first loop and a second loop; the first loop includes a colossal magnetoresistive element, a Helmholtz coil and a first power supply device; the second loop includes a Huygens bridge and a second power supply device. The Helmholtz coil is utilized to supply a counter magnetic field by the use of significant action of the colossal magnetoresistive effect, so as to balance a magnetic field to be measured. When the Huygens bridge is balanced, the magnetic field to be measured is numerically equal to the magnetic field of the Helmholtz coil, but their directions are opposite, therefore, the device is not required to calculate the resistance of the colossal magnetoresistive element, thereby improving calculation accuracy and precision. The electromagnetic shielding device is utilized to effectively shield the environmental magnetic field, provide a measuring environment with zero magnetic field intensity, provide basic parameters without interference for the subsequent measuring, and improve the measuring accuracy.

Description

technical field [0001] The invention relates to a magnetic induction intensity measuring device and method, in particular to a magnetic induction intensity measuring device and a measuring method based on the colossal magnetoresistance effect. Background technique [0002] Magnetic induction measurement is widely used. The prior art mainly adopts Hall sensor or induction coil magnetometer to measure. In particular, Hall sensor is widely used because of its simple structure and easy miniaturization. However, in use, the noise level and static offset of the Hall sensor are relatively large, so the sensitivity and accuracy of the weak magnetic field measurement are not enough. The induction coil magnetometer is a device that works according to Faraday's law of electromagnetic induction, and cannot be used to measure static magnetic fields, and is mainly used for close-range detection. [0003] The magnetic induction intensity can also be measured by using the magnetoresistance...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/09
CPCG01R33/09G01R33/0283
Inventor 王昕王静怡李宇胜
Owner STATE GRID CORP OF CHINA
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