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Magnetic field sensor probe sensitivity improving method

A technology of magnetic field sensors and sensor probes, which is applied in the direction of instruments, measuring magnetic variables, measuring devices, etc., 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 convenient disassembly

Active Publication Date: 2015-09-23
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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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  • Magnetic field sensor probe sensitivity improving method
  • Magnetic field sensor probe sensitivity improving method
  • Magnetic field sensor probe sensitivity improving method

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Experimental program
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Embodiment Construction

[0030] Impedance circuits such as picture 3, the sensor probe 4 is to be fed with an AC 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 Table 6 Record the voltage value at both ends of the sensor probe 4, and change the magnitude and direction of the DC magnetic field Hex. 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 approximately symmetrical about th...

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Abstract

A magnetic field sensor probe sensitivity improving method belongs to the sensor sensitive probe application field; a sensor probe is arranged in a bias magnetic field; a sensor probe easy magnetizing direction is vertical to a bias magnetic field easy magnetizing direction; two ends of the sensor probe are connected with a power supply. A soft-magnetic material can excite the bias magnetic field, so no extra power consumption is generated, thus saving energy; the bias magnetic field and a to be tested object are connected in a non fixed manner; a debug process is simple, dismounting is easy, and operation is simple; the magnetic field sensor probe sensitivity improving method uses the bias magnetic field to improve magnetic material GMI sensitivity, and no damage is caused to raw material, thus saving material.

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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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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