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A Method of Improving the Sensitivity of Magnetic Field Sensor Probe

A technology of sensor probes and magnetic field sensors, which is applied in the direction of instruments, measuring magnetic variables, and measuring devices, can solve the problems that magnetic field sensors cannot be directly applied and cannot meet the use requirements, and achieve the effects of improving GMI sensitivity, easy operation, and energy saving

Active Publication Date: 2018-07-06
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, considering factors such as the stability and service life of the equipment, although this method can improve the sensitivity of the GMI effect in theory, it cannot be directly applied to the design of magnetic field sensors and cannot meet the requirements of use.

Method used

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  • A Method of Improving the Sensitivity of Magnetic Field Sensor Probe
  • A Method of Improving the Sensitivity of Magnetic Field Sensor Probe
  • A Method of Improving the Sensitivity of Magnetic Field Sensor Probe

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Embodiment Construction

[0030] Impedance circuits such as image 3 As shown, when the sensor probe 4 is fed with an alternating current of 10 MHz and 3 mA, the DC magnetic field Hex is parallel or perpendicular to the axial direction of the sensor probe 4, and the voltage value at both ends of the sensor probe 4 is recorded by the voltmeter 6, and the magnitude and magnitude of the DC magnetic field Hex are changed. Due to the existence of the GMI effect, the impedance will change with the change of the magnetic field Hex, and different voltage values ​​will be obtained. Therefore, according to the size of the voltage value, the strength of the magnetic field can be judged, which is the basic working principle of the magnetic field sensor based on the GMI effect.

[0031] Regardless of whether the soft magnetic material is a cylindrical fiber material or a thin strip / film, due to the symmetry of the soft magnetic material itself, the change of impedance with the DC magnetic field is often approximate...

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Abstract

A method for improving the sensitivity of a magnetic field sensor probe belongs to the application field of sensor sensitive probes. The method is to place the sensor probe in a bias magnetic field, that is, the easy magnetization direction of the sensor probe is perpendicular to the easy magnetization direction of the bias magnetic field, and the two ends of the sensor probe are connected to a power supply. The present invention adopts the soft magnetic material itself to excite the bias magnetic field, and there is no extra power consumption, which saves energy; the non-fixed connection is adopted between the bias magnetic field and the object to be tested, the adjustment process is simple, the disassembly is convenient, and the operation is easy; the bias magnetic field is used Improve the GMI sensitivity of magnetic materials, without damage or damage to raw materials, and save materials.

Description

technical field [0001] The invention belongs to the field of magnetic field sensor probes, in particular to a method for improving the sensitivity of the magnetic field sensor probes. Background technique [0002] The phenomenon that the impedance changes with the external magnetic field is called the giant magneto impedance (Giant Magneto Impedance, GMI) effect. The high GMI effect at room temperature, especially the high magnetic field sensitivity (often refers to the slope of the impedance changing with the magnetic field), makes the GMI effect in the sensor It has great application potential in magnetic and magnetic recording technology. However, the GMI effect is not only nonlinear, but also the impedance change is almost symmetrical about the zero magnetic field, which greatly reduces the linearity and sensitivity of the magnetic field sensor based on the GMI effect, and limits the application range of the magnetic field sensor. [0003] At present, there are two main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/09
Inventor 张树玲陈炜晔张克维张勇耿桂宏
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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