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Differential magnetoelectric eddy current detection sensor

An eddy current sensor and eddy current detection technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as low sensitivity, weak anti-noise ability, and unrecognizable small defects or cracks, so as to improve detection accuracy and reduce interference. Effect

Active Publication Date: 2021-09-17
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, due to the shortcomings of low sensitivity and weak anti-noise ability of traditional eddy current detection probes, it is impossible to identify small defects or cracks

Method used

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  • Differential magnetoelectric eddy current detection sensor
  • Differential magnetoelectric eddy current detection sensor
  • Differential magnetoelectric eddy current detection sensor

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Embodiment Construction

[0021] Such as Figure 3-4 As shown, the present invention discloses a differential magnetoelectric eddy current detection sensor, including a magnetoelectric magnetic field sensor, an excitation coil 1, a permanent magnet 2, and a coil winding tube 3, and the coil winding tube 3 is externally wound with the excitation coil 1. The magnetoelectric magnetic field sensor and the permanent magnet 2 are installed inside the coil winding tube 3, and the magnetoelectric magnetic field sensor includes a first magnetoelectric magnetic field sensor 4 and a second magnetoelectric magnetic field sensor 5 , the permanent magnet 2 is located between the first magnetoelectric magnetic field sensor 4 and the second magnetoelectric magnetic field sensor 5 . The magnetoelectric magnetic field sensor has the advantages of high sensitivity, low power consumption, small size, and low noise. Replacing traditional detection coils with magnetoelectric magnetic field sensors can greatly improve the s...

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Abstract

The invention provides a differential magnetoelectric eddy current detection sensor which comprises a magnetoelectric magnetic field sensor, an excitation coil (1), a permanent magnet (2) and a coil winding pipe (3), wherein the excitation coil (1) is wound outside the coil winding pipe (3), the magnetoelectric magnetic field sensor and the permanent magnet (2) are installed inside the coil winding pipe (3). The magnetoelectric magnetic field sensor comprises a first magnetoelectric magnetic field sensor (4) and a second magnetoelectric magnetic field sensor (5), and the permanent magnet (2) is located between the first magnetoelectric magnetic field sensor (4) and the second magnetoelectric magnetic field sensor (5). The differential magnetoelectric eddy current sensor has the beneficial effects that the differential magnetoelectric eddy current sensor adopts the outputs of the two magnetoelectric sensors for differential operation, and the differential output is used as the output of the detection probe, so that the interference of self noise is reduced, and the detection precision is greatly improved.

Description

technical field [0001] The invention relates to the field of magnetoelectric sensors, in particular to a differential magnetoelectric eddy current detection sensor. Background technique [0002] Eddy current testing technology is widely used in flaw detection of metallic conductive materials. For example, it is used to detect whether there are leaks in oil and natural gas pipelines; it is used to detect the internal stress changes of high-speed rail tracks; it is used to detect whether there are cracks in the high-precision parts of aircraft and rockets. Obviously, eddy current testing technology has important value in production practice and military industry. Early detection of metal defects can prevent major accidents. However, due to the shortcomings of low sensitivity and weak anti-noise ability, traditional eddy current detection probes cannot identify small defects or cracks. Therefore, it is imperative to improve the sensitivity of the detection probe. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/904
CPCG01N27/904
Inventor 梁仲明吴楷文李强刘洋晨博
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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