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Quality evaluation for air plasma spray thermal barrier coatings with pulsed thermography

Progress in Natural Science:Materials International 2011年第4期21卷 301-306页

作者： Shi-bin ZHAO~1,Cun-lin ZHANG~2,Nai-ming WU~3,Hua-ming WANG~1 1.School of Materials Science and Engineering,Beihang University,Beijing 100191,China 2.Department of Physics,Capital Normal University,Beijing 100048,China 3.School of Jet Propulsion,Beihang University,Beijing 100191,China School of Materials Science and Engineering Beihang University Beijing 100191 China Department of Physics Capital Normal University Beijing 100048 China School of Jet Propulsion Beihang University Beijing 100191 China

pulsed thermography(PT) as a non-contact non-destructive evaluation(NDE) technique was employed to examine as-sprayed air plasma spray(APS) thermal barrier coatings(TBCs) for quality *** and micro-structural characteristics play a vital role in determining the *** this paper,PT logarithmic peak second-derivative method was adopted to measure the thickness of top *** dependent thermal images were used to characterize the microstructure which was confirmed by scanning electron microscope(SEM).The results showed that there was relationship between the temperature distribution of the surface and microstructure change in *** distribution in thermal images and measurement results of thickness were in fairly good agreement with the microstructure *** can be concluded that it was possible to employ these NDE methods as quality evaluation for as-sprayed TBCs.

关键词： thermal barrier coatings(TBCs) non-destructive evaluation(NDE) pulsed thermography microstructure thickness measurement

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Non-destructive Testing of CFRP Using pulsed Thermographic Data Enhanced by Wavelet Transform-based Image Denoising

Non-destructive Testing of CFRP Using Pulsed Thermographic D...

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第36届中国控制会议

作者： Jian-Guo Wang Zhi-Duo Cao Bang-Hua Yang Shi-Wei Ma Min-Rui Fei Shi-Qi Huang Yuan Yao Tao Chen Xiao-Fei Wang School of Mechatronical Engineering and Automation Shanghai UniversityShanghai Key Lab of Power Station Automation Technology Department of Chemical Engineering National Tsing-Hua University Department of Chemical and Process Engineering University of Surrey Shanghai Zhenhua Heavy Industries Company Limited

ISBN: (纸本)9781538629185

pulsed thermography（PT） is a widely used non-destructive testing（NDT） technique for defect detection in carbon fiber reinforced polymers（CFRP） *** signal reconstruction（TSR） is often employed to process thermographic data due to its excellent performance in enhancing the contrast between defects and ***,TSR does not reduce the noise of thermographic data *** solve this problem,this thesis proposes an image denoising method based on wavelet *** experiment results show that dealt with wavelet transform the characteristics of the defective regions are more clearly compared with previous *** the signal-to-noise ratio（SNR） values are improved obviously at the same time.

关键词： pulsed thermography Non-Destructive Testing Thermographic Signal Reconstruction Wavelet Transform

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