Eddy current displacement detection method

A displacement detection, eddy current technology

Inactive Publication Date: 2011-01-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to overcome the shortcomings of the large calibration workload of the existing eddy current displacement detection device, an eddy current displacement detection method is proposed, and the eddy current displacement detection device using this method can match a variety of measured objects with different electromagnetic characteristics

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. like figure 1 and figure 2 As shown, a specific embodiment of an eddy current displacement detection method of the present invention is disclosed, including:

[0030] Step 1. Generate a sinusoidal excitation signal U 0 : The sinusoidal excitation signal U is generated by the signal generation module 0 and input it into the eddy current probe coil module, U 0 Expressed by formula (1),

[0031] u 0 =A 0 cos(ωt+φ 0 ) Formula 1)

[0032] In formula (1), U 0 is the sinusoidal excitation signal, A 0 is the amplitude of the sinusoidal excitation signal, ω is the angular frequency, t is the time variable, φ 0 is the initial phase of the sinusoidal excitation signal, where A 0 and ω are preset known quantities; φ 0 A known quantity obtained by measurement.

[0033] In this embodiment, the signal generation module includes a cont...

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Abstract

The invention relates to an eddy current displacement detection method. The method comprises the following steps of: 1, generating a sinusoidal excitation signal, namely generating the sinusoidal excitation signal U0 by a signal generation module and inputting the sinusoidal excitation signal U0 into an eddy current probe coil module; 2, generating a response signal, namely after inputting the sinusoidal excitation signal into the eddy current probe coil module, probing the change of impedance of an eddy current probe module caused by the change of displacement of the eddy current probe coil module and a detected object to acquire the response signal according to the electromagnetic induction principle, and inputting the response signal into a response signal separation module; and 3, separating the response signal, namely dividing the response signal into a first path of response subsignal and a second path of response subsignal by the response signal separation module, and the like. The eddy current displacement detection method has the advantage of capacity of finishing the displacement detection of detected objects made of various materials by using a set of eddy current displacement detection device, so the times of calibration is reduced, the interchangeability of eddy current displacement detection devices is improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, in particular to the eddy current non-destructive displacement testing technology. Background technique [0002] Eddy current nondestructive testing technology uses the principle of electromagnetic induction to realize detection, measurement and evaluation. When a current that changes harmonically with time is input to the probe coil above a measured object, a magnetic field is first generated around the coil, which is called a primary magnetic field. According to the principle of electromagnetic induction, when the distance between the measured object and the probe coil is small enough, an eddy current is generated in the measured object, and the eddy current also generates a magnetic field (secondary magnetic field), which hinders the change of the primary magnetic field, thereby causing the coil change in impedance. Because the coupling effect of the primary magnetic field an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02G01N27/90
Inventor 杜平安于亚婷杨拓
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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