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Deep eddy current testing device based on flux gate magnetometer and use method

A technology of eddy current detection and magnetometer, which is applied in the direction of measuring devices, material magnetic variables, and material analysis through electromagnetic means, which can solve the problems of unfavorable ultrasonic detection and the inability to use ultrasonic couplant, so as to improve the penetration depth and detection The effect of depth, low cost, high and low frequency sensitivity

Inactive Publication Date: 2017-10-20
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a deep layer eddy current detection device based on a fluxgate magnetometer, which mainly solves the problem that there is an interlayer gap in the multilayer composite material in the prior art, or the ultrasonic coupling agent cannot be used, which is not conducive to ultrasonic detection.

Method used

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  • Deep eddy current testing device based on flux gate magnetometer and use method
  • Deep eddy current testing device based on flux gate magnetometer and use method
  • Deep eddy current testing device based on flux gate magnetometer and use method

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Embodiment

[0038] like figure 1 As shown, a deep eddy current detection device based on a fluxgate magnetometer includes a gantry-type measuring frame 1 constructed of 4040 aluminum profiles, and a fluxgate magnetometer probe 2 arranged in the middle of the crossbeam of the gantry-type measuring frame 1 , the measuring range of the fluxgate magnetometer probe 2 is greater than the geomagnetic field, the coil frame 3 arranged on the crossbeam of the gantry type measuring frame 1 is installed at the bottom of the coil frame 3 and facing the 400 below the fluxgate magnetometer probe 2 An excitation coil 4 with a turn diameter of 25 mm, which generates an ultra-low frequency magnetic field below 300 Hz, is set above the beam of the gantry-type measuring frame 1 to adjust the position of the coil frame 3. The fine-tuning screw 5 is set under the excitation coil 4 for placing The two-dimensional mobile platform 6 of the sample, there are two motors in the two-dimensional mobile platform 6, and...

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Abstract

The invention discloses a deep eddy current testing device based on a flux gate magnetometer and a use method. The deep eddy current testing device is mainly used for solving the problems of interlayer gaps existing in multilayer composite or forbidden use of a ultrasonic coupling agent that are adverse to ultrasonic testing in the prior art. The device comprises a gantry type measuring frame, wherein a fine tuning screw rod is arranged above the gantry type measuring frame; a probe is arranged on the flux gate magnetometer; an exciting coil is arranged under the probe; a two-dimension moving platform is arranged under the exciting coil; a signal generator generates a low frequency electromagnetic field in a certain amplitude through the exciting coil and generates eddy current in a sample; the flux gate magnetometer and the probe are used for measuring the magnetic field of the eddy current; and after a lock-in amplifier demodulates, a computer is used for collecting. According to the scheme, the deep eddy current testing device can be used for clearly distinguishing the defects in linear and crossing shape and realizing the nondestructive testing for the conductor joints. For the conditions of interlayer gaps existing in multilayer composite or forbidden use of a ultrasonic coupling agent for testing, the deep eddy current testing device has ultrahigh practical value and popularizing value.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection of conductor deep layers and joints, and in particular relates to a deep layer eddy current detection device based on a fluxgate magnetometer and a use method thereof. Background technique [0002] Eddy current testing is a mature non-destructive testing method. The traditional testing probe is an induction coil, but limited by the skin effect, the sensitivity of the induction coil decreases as the frequency decreases. The induction coil method can only detect conductor surface and near-surface defects. . The new eddy current detection method is to replace the detection probe with a new type of magnetometer such as a giant magnetoresistive probe and a superconducting quantum interference device (SQUID), which can improve the sensitivity of the magnetic field, especially the low-frequency sensitivity, and improve the depth of eddy current detection. However, using magnetic flux T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/90G01N27/9006
Inventor 刘政豪
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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