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Dual-mode detection system utilizing planar spiral coil capacitance effect

A capacitive effect, planar coil technology, applied in the direction of material capacitance, material resistance, material magnetic variable, etc., can solve the problems of non-conductive material detection, inability to penetrate deep metal defects, and achieve the best detection effect, increase line width effect

Pending Publication Date: 2021-03-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

[0005] The object of traditional eddy current testing must be conductive materials, non-conductive materials cannot be tested, and it is only suitable for detecting metal surface defects, and cannot penetrate deep metal defects

Method used

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  • Dual-mode detection system utilizing planar spiral coil capacitance effect
  • Dual-mode detection system utilizing planar spiral coil capacitance effect
  • Dual-mode detection system utilizing planar spiral coil capacitance effect

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and specific examples the present invention will be further described:

[0023] A dual-mode detection system utilizing the capacitive effect of a planar helical coil such as figure 1 with Figure 7 As shown, it includes an X-Y-Z three-axis scanning gantry 1, a dual-mode detection sensor 2, a calibration device 3, an impedance analyzer 4, and a PC 5;

[0024] The dual mode detection sensor 2 such as figure 2 with 3 As shown, it includes a shell 2.1, a planar spiral coil 2.2 and a BNC interface 2.3.

[0025] The impedance analyzer 4 outputs a frequency-sweeping sinusoidal signal, which excites the dual-mode detection sensor 2 after passing through the calibration device 3. At this time, the dual-mode detection sensor 2 is still on the X-Y-Z three-axis scanning platform 1, and the impedance information changes with the frequency. Received by the impedance analyzer, the relevant frequency sweep data is recorded and analyze...

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Abstract

The invention discloses a dual-mode detection system utilizing a planar coil capacitance effect. The dual-mode detection system comprises a dual-mode detection sensor, an X-Y-Z three-axis scanning rack, an impedance analyzer, an impedance analyzer calibration device and a PC; the dual-mode detection sensor is fixed on a clamp of the rack, the rack is controlled by the PC to scan a workpiece to bedetected, the dual-mode detection sensor is connected to the calibration device through a BNC line, and the calibration device is fixed on the impedance analyzer; and the dual-mode detection sensor comprises a planar spiral coil, a shell and a BNC interface, and the planar spiral coil is connected to the BNC interface through a wire. The system has the beneficial effects that a detection mode of simultaneously utilizing an eddy current effect and a capacitance effect is provided, and metal and nonmetal defects can be simultaneously detected by enhancing the capacitance effect of the planar spiral coil; and the detection mode can be switched without manually switching wiring, and the optimal detection effect can be achieved by increasing the line width and setting the optimal frequency of signals according to different materials.

Description

technical field [0001] The invention belongs to the field of electromagnetic non-destructive testing, in particular to a dual-mode testing system utilizing the capacitive effect of a planar spiral coil. Background technique [0002] The traditional eddy current testing technology uses the principle of electromagnetic induction to non-destructively evaluate certain properties of conductive materials and their workpieces, or to detect defects by measuring the changes of induced eddy currents in the inspected workpiece. The original magnetic field on the surface of the workpiece is superimposed with the induced magnetic field associated with the eddy current, which changes the complex impedance of the detection coil. The amplitude, phase, flow form and associated magnetic field of the induced eddy current in the conductor are affected by the physical characteristics of the conductor, so the physical and process performance of the conductor can be evaluated non-destructively by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90G01N27/24G01N27/04
CPCG01N27/90G01N27/24G01N27/04
Inventor 殷晓康李盈盈张晓瑞朱挺袁新安李伟陈国明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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