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Liquid ingress recognition in honeycomb structure by pulsed thermography

Published online by Cambridge University Press:  30 April 2013

Dapeng Chen ,
Zhi Zeng ,
Ning Tao ,
Cunlin Zhang  and
Zheng Zhang
Dapeng Chen
Affiliation:
School of Material Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, P.R. China
Zhi Zeng*
Affiliation:
Institute of Physics and Electronic Engineering, Chongqing Normal University, 12 Tianchen Road, Chongqing 400047, P.R. China Department of Physics, Capital Normal University, 105 Xisanhuan North Road, Beijing 100048, P.R. China
Ning Tao
Affiliation:
Department of Physics, Capital Normal University, 105 Xisanhuan North Road, Beijing 100048, P.R. China
Cunlin Zhang
Affiliation:
Department of Physics, Capital Normal University, 105 Xisanhuan North Road, Beijing 100048, P.R. China
Zheng Zhang
Affiliation:
School of Material Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, P.R. China
*
ae-mail: zzh406@hotmail.com
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Abstract

Pulsed thermography has been proven to be a fast and effective method to detect fluid ingress in aircraft honeycomb structure; however, water and hydraulic oil may have similar appearance in the thermal image sequence. It is meaningful to identify what kind of liquid ingress it is for aircraft maintenance. In this study, honeycomb specimens with glass fiber and aluminum skin are injected different kinds of liquids: water and oil. Pulsed thermography is adopted; a recognition method is proposed to first get the reference curve by linear fitting the beginning of the logarithmic curve, and then an algorithm based on the thermal contrast between liquid and reference is used to recognize what kind of fluid it is by calculating their thermal properties. It is verified with the results of theory and the finite element simulation.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 62 , Issue 2 , May 2013 , 20701
Copyright
© EDP Sciences, 2013

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