A Design Method for Improving the Sensitivity of Eddy Current Detection Limit by Resonant Frequency Variation

A technology of eddy current detection and design method, which is applied in the direction of material magnetic variables, etc., can solve the problems of non-adjustable frequency, narrow bandwidth, and only suitable for fixed frequency work, etc., and achieve the effect of improving the limit sensitivity

Active Publication Date: 2016-09-14
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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Problems solved by technology

[0010] To sum up, the commonly used quartz crystal oscillator in conventional eddy current testing instruments has good frequency stability, high Q value and narrow bandwidth; however, the frequency cannot be adjusted and is only suitable for fixed frequency work.
For the detection of some special occasions, in order to change the detection frequency, only the open-loop method of frequency division can be used to adjust, so it is impossible to use the frequency offset characteristic signal generated by material discontinuity in actual detection

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  • A Design Method for Improving the Sensitivity of Eddy Current Detection Limit by Resonant Frequency Variation

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Embodiment Construction

[0018] figure 1 The embodiment shown is a design method for improving the limit sensitivity of eddy current detection by changing the resonant frequency of the present invention. The frequency generated by the resonant circuit LCR is used to replace the quartz crystal oscillator in the eddy current detection instrument, and the eddy current detection coil P is used as the inductance of the resonant circuit In part L, R is the loss of the resonant loop; during the detection process, the eddy current detection coil P will change the amplitude and frequency of the defect or discontinuity of the workpiece, and further perform quadrature detection on the picked up eddy current detection signal to obtain the resonance Impedance signal plot for eddy current testing. The resonant eddy current detection impedance signal diagram contains amplitude, phase and frequency information; the resonant eddy current detection impedance signal diagram is compared with the conventional eddy current...

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Abstract

The invention discloses a design method for improving the limit sensitivity of eddy current detection by changing the resonance frequency. The frequency generated by the resonance circuit is used to replace the quartz crystal oscillator in the eddy current detection instrument. The eddy current detection coil is used as the inductance part of the resonance circuit. Through this method design The eddy current detection instrument can obtain the impedance signal diagram of the resonant eddy current detection including amplitude, phase and frequency information. In addition to the working characteristics of the first generation resonant eddy current instrument, it also has the advantages of the second generation impedance plane analysis eddy current instrument. The superposition of mechanisms further improves the limit sensitivity of eddy current detection.

Description

Technical field [0001] The invention relates to a design method of a non-destructive testing instrument, in particular to a design method for improving the limit sensitivity of eddy current detection by changing the resonance frequency. Background technique [0002] Eddy current testing is a non-destructive testing method based on the principle of electromagnetic induction and is suitable for conductive materials. When a conductor is placed in an alternating magnetic field, an induced current will be generated in the conductor, which is called eddy current. Due to changes in various factors of the conductor itself (such as electrical conductivity, magnetic permeability, shape, size and defects, etc.), it will lead to changes in the induced current. This phenomenon is used to judge the nature, state and defect detection method of the conductor. , called the eddy current testing method. [0003] During eddy current testing, the conductor is brought close to the coil with alt...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/90
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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