Inverse methodology for identification the thermal diffusivity and subsurface defect of CFRP composite by lock-in thermographic phase (LITP) profile reconstruction

2016 ◽  
Vol 138 ◽  
pp. 214-226 ◽  
Author(s):  
Liu Junyan ◽  
Wang Fei ◽  
Liu Yang ◽  
Wang Yang
Keyword(s):  
Thermal Diffusivity ◽  
Subsurface Defect ◽  
Cfrp Composite ◽  
Lock In ◽  
Profile Reconstruction

scholarly journals Direct Measurement of the In-Plane Thermal Diffusivity of Semitransparent Thin Films by Lock-In Thermography: An Extension of the Slopes Method

2019 ◽  
Vol 91 (13) ◽  
pp. 8476-8483 ◽  
Author(s):  
Alexandra Philipp ◽  
Nelson W. Pech-May ◽  
Bernd A. F. Kopera ◽  
Anna M. Lechner ◽  
Sabine Rosenfeldt ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Diffusivity ◽  
Direct Measurement ◽  
Lock In

Thermal diffusivity of metals determined by lock-in thermography

2017 ◽  
Vol 14 (2) ◽  
pp. 218-225 ◽  
Author(s):  
P. W. Nolte ◽  
T. Malvisalo ◽  
F. Wagner ◽  
S. Schweizer
Keyword(s):  
Thermal Diffusivity ◽  
Lock In

Research on the Quantitative Analysis of Subsurface Defects for Nondestructive Testing by Ultrasound Lock-In Thermography

2011 ◽  
Vol 301-303 ◽  
pp. 635-640
Author(s):  
Jun Yan Liu ◽  
Qing Ju Tang ◽  
Yang Wang
Keyword(s):  
Quantitative Analysis ◽  
Steel Plate ◽  
Threshold Value ◽  
Canny Operator ◽  
Subsurface Defect ◽  
Artificial Neural Network Ann ◽  
Lock In ◽  
Takagi Sugeno ◽  
Good Agreement ◽  
Subsurface Defects

This paper describes the quantitative analysis of the shape, boundary, and depth of subsurface defects by ultrasound lock-in thermography. The phase difference between defective areas and non-defective areas illustrates the qualitative analysis of the shape and the boundary of the subsurface defect. In order to accurately estimate the shape, boundary and depth of the defects, the optimal threshold value method is proposed to identify the shape and boundary of the subsurface defects based on the canny operator of image processing. A self–adaption artificial neural network (ANN) with Takagi-Sugeno modeling is proposed to determine the depth of the subsurface defect. Experimental results for a steel plate with artificial subsurface defects show good agreement with actual values.

scholarly journals Measurement of Thermal Diffusivity by Lock-in Thermography

2000 ◽  
Author(s):  
P.G. Bison ◽  
S. Marinetti ◽  
E. Grinzato
Keyword(s):  
Thermal Diffusivity ◽  
Lock In

The strong influence of heat losses on the accurate measurement of thermal diffusivity using lock-in thermography

2009 ◽  
Vol 95 (12) ◽  
pp. 121905 ◽  
Author(s):  
Agustín Salazar ◽  
Arantza Mendioroz ◽  
Raquel Fuente
Keyword(s):  
Thermal Diffusivity ◽  
Strong Influence ◽  
Heat Losses ◽  
Lock In
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