Lock-In Thermography with Cooling for the Inspection of Composite Materials

被引:1
作者
Lukaszuk, Ryszard Dymitr [1 ]
Marques, Rafael Monteiro [2 ]
Chady, Tomasz [3 ]
机构
[1] West Pomeranian Univ Technol, Doctoral Sch, PL-70313 Szczecin, Poland
[2] West Pomeranian Univ Technol, Fac Elect Engn, PL-70313 Szczecin, Poland
[3] West Pomeranian Univ Technol, Fac Elect Engn, PL-70313 Szczecin, Poland
关键词
nondestructive testing (NDT); nondestructive evaluation (NDE); lock-in thermography (LIT); glass fiber-reinforced composites; IDENTIFICATION;
D O I
10.3390/ma16216924
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This paper presents the development of the lock-in thermography system with an additional cooling system. System feasibility is tested by investigating a square-shaped glass fiber-reinforced polymer (GFRP) with artificially made outer flaws. The influence of heating mode and sinusoidal excitation period on the defect detectability is considered. Thus, the experiment is split into two modes: the sample is solely heated in the first mode or simultaneously heated and cooled in the second. In each mode, the temperature measurement is performed first with a shorter excitation signal period and second with a longer one. The signal-to-noise ratio (SNR) is used to assess defect detection quantitatively. The comparative analysis shows that employing a mixed heating-cooling mode improves the SNR compared to the conventional heating mode. The further enhancement of the SNR is obtained by extending the excitation period. The combination of simultaneous heating and cooling with longer periods of the excitation signal allows for the best SNR values for the most detected defects.
引用
收藏
页数:15
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