Exciting power supply characteristics for pulsed eddy current thermography

被引：0
|
作者：
Tang B. [1 ]
Fang X. [1 ]
Hou D. [1 ]
Ye S. [1 ]
机构：
[1] Institute of Industry and Trade Measurement Technique, China Jiliang University, Hangzhou
来源：
Ye, Shuliang (itmt_paper@126.com) | 2018年 / Science Press卷 / 39期
关键词：
Exciting power supply; Frequency tracking technology; Full-bridge inverter circuit; Pulsed eddy current thermography; U-shaped yoke probe;
D O I：
10.19650/j.cnki.cjsi.j1702491
中图分类号：
学科分类号：
摘要：
The performance of exciting power supply can directly influence the signal feature extraction, the detection sensitivity and detection probability in pulsed eddy current thermography. Aiming at the problems of the low electromagnetic coupling efficiency and the poor heating uniformity in the traditional water-cooled copper tube induction heating power, a pulsed exciting power supply with a U-shaped yoke probe is proposed. Based on the detection theory of pulsed eddy current thermography and electromagnetic heat coupled equations, a probe structure with excitation coil twining the U-shaped yoke is designed. The effects of coil ampere-turns and heating time on the temperature field distribution of sample crack are analyzed. Then the integrated system scheme of pulsed exciting power system is introduced. The commutation process of the voltage-fed full-bridge inverter is also discussed, which provides a reference for reasonable setting the IGBT control signal to turn on or off. In order to realize quick searching resonance frequency of the load and effective real-time tracking resonant frequency, a modified all digital fixed-angle frequency tracking technology is proposed and realization process is also elaborated in detail. To verify the validity of theoretical analysis, the performance of pulsed exciting power supply is tested and also applied to detect of metal surface crack in pulsed eddy-current thermography. © 2018, Science Press. All right reserved.
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页码：208 / 215
页数：7
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