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Eddy current probe based on Halbach array coil

An eddy current probe and array technology, applied in the field of eddy current probes, can solve the problems of insufficient magnetic field strength, affecting the sensitivity and detection accuracy of eddy current sensors, etc., and achieve the effects of magnetic field enhancement, measurement accuracy and resolution, and strong eddy current effect

Pending Publication Date: 2021-12-10
PIPECHINA SOUTH CHINA CO
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Problems solved by technology

It is common that the magnetic field strength generated by the coil is not strong enough. In the final analysis, it is because the magnetic induction lines are not well concentrated, which directly affects the sensitivity and detection accuracy of the eddy current sensor.

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  • Eddy current probe based on Halbach array coil
  • Eddy current probe based on Halbach array coil

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specific Embodiment 1

[0020] according to Figure 1 to Figure 2 As shown, the present invention provides an eddy current probe based on a Halbach array coil, and the present invention proposes an eddy current probe based on a Halbach array coil. Aiming at the deficiencies of the existing coil structure, the present invention faces the field of high-precision measurement of micro-displacement, and invents a design of an eddy current probe based on a Halbach array coil. On the basis of parallel cylindrical single coils, the coil arrangement in the form of a Halbach array is innovatively adopted. By arranging permanent magnets with different magnetization directions according to certain rules, the magnetic field lines can be gathered on one side of the magnet and weakened on the other side. Magnetic field lines, so as to obtain an ideal unilateral magnetic field, so that the magnetic field on one side is significantly enhanced, which can induce a stronger eddy current effect and improve the measuremen...

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Abstract

The invention relates to an eddy current probe based on a Halbach array coil. The probe comprises a first coil, a second coil, a third coil, a fourth coil and a fifth coil; the first coil, the third coil and the fifth coil are horizontally arranged; the second coil and the fourth coil are vertically arranged; current is introduced into one end of the first coil to generate a magnetic field; current is introduced into one end of the second coil to generate a magnetic field; the other end of the third coil is electrified to generate a magnetic field; current is introduced into different terminals of the fourth coil to generate a magnetic field; a current which is the same as that of the first coil is introduced into the fifth coil to generate a magnetic field; and one side with dense magnetic induction lines is taken as the displacement measurement direction of the eddy current probe.

Description

technical field [0001] The invention relates to the technical field of eddy current sensors, and relates to an eddy current probe based on a Halbach array coil. Background technique [0002] Based on the principle of eddy current mutual inductance effect with conductive medium, eddy current sensor can realize high-precision measurement of internal defects and micro displacement of the measured object. It is characterized by good long-term working reliability, high sensitivity, strong anti-interference ability, non-contact measurement, response Fast speed, not affected by media such as oil and water. Therefore, it is widely used in the fields of non-destructive testing of metal equipment and high-precision measurement. [0003] However, limited by technical bottlenecks such as coil structure and parameter optimization, existing eddy current sensors have defects such as poor sensitivity, insufficient linearity, and detection accuracy under sudden temperature changes, which li...

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Application Information

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IPC IPC(8): G01N27/90
CPCG01N27/90G01N27/9006H01F7/20G01R1/067
Inventor 田中山仪林杨昌群牛道东梁伽铭
Owner PIPECHINA SOUTH CHINA CO
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