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A method for detecting discontinuity of non-metallic materials by capacitance of parallel resonant circuit

A non-metallic material, resonant circuit technology, applied in the direction of material capacitance, etc., can solve the problems of electromagnetic non-destructive testing method metal material discontinuity detection and other problems, achieve the effect of easy automatic detection, improve detection efficiency and detection accuracy

Active Publication Date: 2016-07-27
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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Problems solved by technology

Electromagnetic nondestructive testing methods are currently only used for discontinuity detection in metallic materials

Method used

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  • A method for detecting discontinuity of non-metallic materials by capacitance of parallel resonant circuit

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Embodiment Construction

[0017] in figure 1 In the illustrated embodiment, a method for detecting the discontinuity of non-metallic materials by the capacitance of a parallel resonant circuit uses the capacitor C in the parallel resonant circuit device as a detection sensor for detecting the discontinuity of non-metallic materials. At this time, the parallel resonance There are holes or gaps between the two plates of the capacitor C in the circuit device, and the tested non-metallic material A can pass through the holes or gaps between the two plates; according to the capacitance formula C=ε r ε 0 S / d And parallel resonant circuit resonant frequency calculation formula f 0 = 1 / (2 π ( LC ) 1 / 2 ) It can be seen that the resonance frequency of the parallel resonance circuit RLC f 0 The relative permittivity of the medium between the two plates of the capacitor ε r Related, when there is discontinuity in the medium, the relative permittivity of the medium ε r Will change, resulting in the resonant freq...

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Abstract

The invention discloses a method for testing the discontinuity of a non-metallic material by virtue of a capacitor of a shunt-resonant circuit. According to the method, a capacitor in a shunt-resonant circuit device is taken as a detection sensor based on an electromagnetism theory, the discontinuity of the non-metallic material is detected by virtue of a character that the resonant frequency of the shunt-resonant circuit is changed due to the changing of mediums between two polar plates of the capacitor, the limitation of a current nondestructive testing theory is broken through, and an electromagnetic testing method is applied to the testing of the discontinuity of the non-metallic material, so that the automatic testing is easy to realize, and the detection efficiency and the detection accuracy of the discontinuity of the non-metallic material are improved.

Description

Technical field [0001] The invention relates to a non-destructive detection method, in particular to a method for detecting the discontinuity of non-metallic materials by the capacitance of a parallel resonance circuit. Background technique [0002] For non-metallic material discontinuity testing, non-destructive testing methods currently used include acoustic, mechanical, and radiographic testing methods. Electromagnetic nondestructive testing methods are currently only used for discontinuity testing of metallic materials. Compared with detection methods such as acoustics, mechanics, and radiation, electromagnetic detection has the advantages of high detection accuracy, fast detection speed, and easy realization of automatic detection, among which the resonance circuit has extremely high detection sensitivity. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for detecting the discontinuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/24
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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