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Eddy current pulsed thermography-based non-destructive detection method and system

A non-destructive testing and eddy current technology, which is applied in the direction of material defect testing, etc., can solve the problems of poor temperature control accuracy of heating, difference of test results, burning of the tested sample, etc.

Inactive Publication Date: 2018-06-22
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0009] However, in the current non-destructive testing based on eddy current pulse thermal imaging, the heating control of the tested sample is carried out according to the preset pulse signal, and the heating temperature control accuracy is poor, which may easily cause the burning of the tested sample; at the same time, Due to the natural cooling method, there will be differences in test results under different ambient temperatures, making non-destructive testing susceptible to the impact of ambient temperature

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[0037] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0039] The change law of the infrared thermal image sequence over time includes two stages: the induction heating stage in which the material temperature rises rapidly and the cooling stage in which the material temperature gradually decreases. Among them, in the induction heating stage, the temperature of the tested sample rises with the heating time, and the phase diagram formed by the infrared thermal imaging sequence shows that the phase difference between the defect area (non-uniform area) and the non-defect area...

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Abstract

The embodiment of the invention discloses an eddy current pulsed thermography-based non-destructive detection method and an eddy current pulsed thermography-based non-destructive detection system. Themethod comprises the following steps: generating high-frequency alternating current by controlling an induction heater through an initial heating pulse signal, and combining an induction coil to provide eddy current excitation to heating a tested sample piece; measuring infrared thermal radiation of the tested sample piece to obtain surface heat distribution of the tested sample piece, acquiringan infrared thermography sequence according to the surface heat distribution and performing processing to acquire sampling temperature of a preset sampling point of the tested sample piece; if the sampling temperature is not less than a preset non-destructive detection high-temperature threshold value, outputting a heating stopping instruction to a pulse generator; if the sampling temperature is not more than a preset non-destructive detection low-temperature threshold value, outputting a heating starting instruction to the pulse generator; and controlling the induction heater to disconnect apower supply according to the heating stopping instruction, and controlling the induction heater according to the heating instruction to start the power supply to generate high-frequency alternating current. By application of the method and the system, the temperature control precision of heating can be improved.

Description

technical field [0001] The invention relates to non-destructive testing technology, in particular to a non-destructive testing method and system based on eddy current pulse thermal imaging. Background technique [0002] Non-destructive testing is a key technology to ensure the manufacturing quality and operation safety of major engineering equipment. The non-destructive testing technology based on eddy current pulse thermal imaging comprehensively uses the phenomenon of eddy current and Joule heating, and has the advantages of non-contact, large single detection area and high efficiency. It is a research hotspot in the field of non-destructive testing in recent years that it can effectively detect surface defects and provide guarantee for quality and operation safety. [0003] At present, the evaluation of surface defects by eddy current pulse thermography is mainly based on the disturbance of eddy current distribution by defects. For cracks on the surface or inside of the ...

Claims

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Application Information

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IPC IPC(8): G01N25/72
CPCG01N25/72
Inventor 蔡波朱玉玉
Owner SOUTHWEAT UNIV OF SCI & TECH
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