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Orthogonal vortex detection sensor

An eddy current detection and sensor technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of low sensitivity and inapplicability of high sensitivity detection occasions, achieve strong anti-interference ability, broaden the frequency band of the probe, and improve the detection sensitivity Effect

Pending Publication Date: 2018-06-05
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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AI Technical Summary

Problems solved by technology

However, the sensitivity of the technical solution disclosed in the CN1028946A patent is low, and it is not suitable for some detection occasions that require high sensitivity.

Method used

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Embodiment 1

[0011] Embodiment one, such as figure 1 As shown, an orthogonal eddy current detection sensor includes an excitation coil 1 and a non-directional electromagnetic detection sensor 2, wherein the excitation coil 1 is wound around the circumferential periphery of the non-directional electromagnetic detection sensor 2, The coil winding directions of the upper half and the lower half of the one excitation coil 1 are opposite; the coil winding section of the one excitation coil 1 is perpendicular to the coil winding section in a non-directional electromagnetic detection sensor 2; An exciting coil 1 is used to excite and generate an eddy current field; the non-directional electromagnetic detection sensor 2 is used to receive the induction signal of the inspected workpiece in the eddy current field.

Embodiment 2

[0012] Embodiment two, such as figure 2 As shown, an orthogonal eddy current detection sensor, further, two excitation coils 11, 12 are used to wrap around the circumferential periphery of the non-directional electromagnetic detection sensor 2, and the winding directions of the two excitation coils 11, 12 are opposite, and one The excitation coil 11 is wound clockwise, and the excitation coil 12 is wound counterclockwise; the coil winding sections of the two excitation coils 11 and 12 are perpendicular to the coil winding section in the non-directional electromagnetic detection sensor 2 .

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Abstract

The invention discloses an orthogonal vortex detection sensor. A method for increasing a driving exciting coil winding outside a non-directinoal electromagnetic detection sensor is adopted, so that onone hand, the advantages of high anti-jamming capability and capability of detecting 45-degree crack direction are retained, and on the other hand, the effects of improving the detection sensitivityand broadening the frequency band of a probe are achieved.

Description

technical field [0001] The invention relates to a nondestructive testing device, in particular to an orthogonal eddy current testing sensor. Background technique [0002] Due to the influence of the lift-off effect, conventional eddy current detection probes are difficult to implement effective detection for workpieces with large surface roughness and high detection requirements. The differential electromagnetic detection sensor composed of two detection coils crossed orthogonally has the characteristics of suppressing the interference of the lift-off effect, and is especially suitable for the detection of metal materials with uneven surfaces. For the orthogonal sensor, the crack direction at 45 degrees is a blind area and cannot be detected. Chinese patent CN1028946A adopts the principle of cross-linked combined probe and differential hybrid algorithm. The sensor consists of two groups of cross-shaped differential detection coils with a difference of 45 degrees, concentric...

Claims

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Application Information

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IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 林俊明沈功田戴永红赵晋成
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD