Abstract
In this paper, a new inducer of pulsed eddy current thermography (PECT) is presented. The use of the inducer can help avoid the problem of blocking the infrared (IR) camera’s view in eddy current thermography technique. The inducer can also provide even heating of the test specimen. This paper is concerned with the temperature distribution law around the crack on a specimen when utilizing the new inducer. Firstly, relative mathematical models are provided. In the following section, eddy current distribution and temperature distribution around the crack are studied using the numerical simulation method. The best separation distance between the inducer and the specimen is also determined. Then, results of temperature distribution around the crack stimulated by the inducer are gained by experiments. Effect of current value on temperature rise is studied as well in the experiments. Based on temperature data, temperature features of the crack are discussed.
Highlights
Non-destructive testing (NDT) techniques have been widely used in various fields and become the indispensable means of quality assurance in the world.[1]
Pulsed eddy current thermography (PECT), as an IR thermography method, uses eddy currents as its excitation source and is developing very fast.[9,10,11,12]. This method combines the characteristics of eddy current testing and IR thermography testing
A new inducer is designed for pulsed eddy current thermography (PECT) and good results of crack detection are obtained in experiments by using the inducer
Summary
Non-destructive testing (NDT) techniques have been widely used in various fields and become the indispensable means of quality assurance in the world.[1]. Pulsed eddy current thermography (PECT), as an IR thermography method, uses eddy currents as its excitation source and is developing very fast.[9,10,11,12] This method combines the characteristics of eddy current testing and IR thermography testing. It can detect surface defects and internal defects by using an IR camera to capture images of the abnormal temperature distribution around the defects.[13] There are mainly four processes included in PECT: 1) generation of eddy currents; 2) heating of samples; 3) thermal image acquisition; 4) thermal image processing. Based on the experiment results, the law of temperature field distribution around the crack is discussed
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