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Orthogonal rotation exciting field eddy current transducer

An eddy current sensor and sensor technology, which is applied in the direction of material magnetic variables, can solve the problem of only selective detection, etc., and achieve the effects of reducing the occurrence of defect missed detection, high sensitivity, and meeting the detection requirements

Inactive Publication Date: 2015-09-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003] The present invention proposes a new differentially excited eddy current sensor structure capable of inducing a rotating eddy current field on the surface of a metal test piece. The sine and cosine currents with a difference of 90 degrees induce an eddy current excitation field with uniform amplitude and gradually changing direction on the surface of the metal test piece, which realizes the effective detection of actual defects with random distribution of directions, and overcomes the traditional structure that can only selectively detect defects. Detection, prone to missed detection and other deficiencies, effectively improving the reliability of the actual eddy current detection

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  • Orthogonal rotation exciting field eddy current transducer
  • Orthogonal rotation exciting field eddy current transducer
  • Orthogonal rotation exciting field eddy current transducer

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Embodiment Construction

[0026] In order to better illustrate the purpose and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] In the embodiment, an aluminum-based alloy plate is selected, and crack-like defects with a size of (width × length × depth) 0.15 mm × 20 mm × 1 mm are processed on it by electric spark etching, and they are arranged at different angles, such as Figure 5 As shown, the purpose of setting defects in this way is to examine the detection ability of the sensor for defects in different orientations.

[0028] Move the sensor along the length of the specimen, and a sudden change in the signal amplitude can be observed at the defect position, such as Image 6 , Figure 7 , the signal is further processed through a low-pass filter, etc., and the defect signal can be clearly extracted. from Image 6 , Figure 7 It can be found that for the new structure sensor, ...

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Abstract

The invention provides an orthogonal rotation exciting field eddy current transducer belonging to the technical scope of electric eddy current detection in the field of nondestructive testing. The eddy current transducer is mainly divided into an absolute structure and a differential motion type structure; the absolute type eddy current transducer cannot easily meet small defect detection requirements; and the differential motion type transducer can be used for effectively inhibiting common mode interference signals including temperature, lift-off effect and the like, and is relatively suitable for identifying small defects. A traditional differential motion transducer exciting coil is improved and a novel transducer exciting coil is composed of a sine winding and a cosine winding; in a working process, two harmonic currents are conducted into the two exciting coils by sine and cosine given frequencies; the two exciting currents are combined to form a rotary eddy current field so that the transducer is sensitive to eddy current distributed in each direction; when no crack exists, the two eddy current fields are balanced in a detection coil; and when a test piece has defects including the cracks and the like, the balance is broken through and an induction signal is generated in a measuring coil.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic eddy current nondestructive testing, and relates to a novel eddy current sensor structure designed and manufactured for detecting small defects randomly distributed in the direction of metal components. It can be used in the eddy current detection technology of tiny defects of metal materials, and provides a new sensor solution for the detection of defects in actual engineering structures. Background technique [0002] Defects such as fatigue cracks in metal materials seriously affect the life and safety of mechanical products. It is an important task in the field of machinery manufacturing to implement non-destructive testing on important mechanical products. In the conventional non-destructive testing technology, the eddy current sensor using electromagnetic interaction plays an important role. This testing method has the advantages of fast testing speed, low requirements on site conditi...

Claims

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Application Information

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IPC IPC(8): G01N27/90
Inventor 张卫民秦峰岳明明陈国龙庞炜涵
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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