Defect Automatic Identification of Eddy Current Pulsed Thermography

Eddy current pulsed thermography (ECPT) is an effective nondestructive testing and evaluation (NDT&E) technique, and has been applied for a wide range of conductive materials. Manual selected frames have been used for defects detection and quantification. Defects are indicated by high/low temperature in the frames. However, the variation of surface emissivity sometimes introduces illusory temperature inhomogeneity and results in false alarm. To improve the probability of detection, this paper proposes a two-heat balance states-based method which can restrain the influence of the emissivity. In addition, the independent component analysis (ICA) is also applied to automatically identify defect patterns and quantify the defects. An experiment was carried out to validate the proposed methods.

[1]  C. Meola.  Nondestructive Evaluation of Materials With Rear Heating Lock-In Thermography , 2007, IEEE Sensors Journal.

[2]  Wilhelm Satzger,et al.  Thermographic crack detection by eddy current excitation , 2007 .

[3]  V. Altuzar,et al.  Atmospheric pollution profiles in Mexico City in two different seasons , 2003 .

[4]  Feilu Luo,et al.  Defect characterisation based on heat diffusion using induction thermography testing. , 2012, The Review of scientific instruments.

[5]  G. Tian,et al.  Surface Crack Detection for Carbon Fiber Reinforced Plastic (CFRP) Materials Using Pulsed Eddy Current Thermography , 2011, IEEE Sensors Journal.

[6]  Wai Lok Woo,et al.  Spatial and Time Patterns Extraction of Eddy Current Pulsed Thermography Using Blind Source Separation , 2013, IEEE Sensors Journal.

[7]  Hans-Peter Maier,et al.  Measurement of in-plane diffusivity in non-homogeneous slabs by applying flash thermography , 2004 .

[8]  Beate Oswald-Tranta,et al.  Thermo-Inductive Surface Crack Detection in Metallic Materials , 2006 .

[9]  S. Marinetti,et al.  Pulse phase infrared thermography , 1996 .

[10]  N. Ganesan,et al.  Simultaneous Estimation of Electrical and Thermal Properties of Isotropic Material from the Tone-Burst Eddy Current Thermography (TBET) Time–Temperature Data , 2011, IEEE Transactions on Magnetics.

[11]  Krishnendu Chatterjee,et al.  Image Enhancement in Transient Lock-In Thermography Through Time Series Reconstruction and Spatial Slope Correction , 2012, IEEE Transactions on Instrumentation and Measurement.

[12]  Ravibabu Mulaveesala,et al.  Three-Dimensional Pulse Compression for Infrared Nondestructive Testing , 2009 .

[13]  Lichun Feng,et al.  Specified value based defect depth prediction using pulsed thermography , 2012 .

[14]  Otwin Breitenstein,et al.  Localization of gate oxide integrity defects in silicon metal-oxide-semiconductor structures with lock-in IR thermography , 2000 .

[15]  P. Cawley,et al.  Eddy-current induced thermography—probability of detection study of small fatigue cracks in steel, titanium and nickel-based superalloy , 2012 .

[16]  Feilu Luo,et al.  Defect characterisation using pulsed eddy current thermography under transmission mode and NDT applications , 2012 .

[17]  Yunze He,et al.  Impact evaluation in carbon fiber reinforced plastic (CFRP) laminates using eddy current pulsed thermography , 2014 .

[18]  D. Almond,et al.  Transient thermography in the assessment of defects of aircraft composites , 2003 .

[19]  Steven M. Shepard,et al.  Flash Thermography of Aerospace Composites , 2007 .

[20]  Transient thermography as a through skin imaging technique for aircraft assembly: modelling and experimental results , 2004 .

[21]  Gui Yun Tian,et al.  PEC thermography for imaging multiple cracks from rolling contact fatigue , 2011 .

[22]  Gui Yun Tian,et al.  Stress Measurement Using Pulsed Eddy Current Thermography , 2012 .

[23]  Gui Yun Tian,et al.  Reducing the Effect of Surface Emissivity Variation in Eddy Current Pulsed Thermography , 2014, IEEE Sensors Journal.

[24]  Dixiang Chen,et al.  Eddy current pulsed phase thermography and feature extraction , 2013 .

[25]  Norbert Meyendorf,et al.  Surface crack detection in ferritic and austenitic steel components using inductive heated thermography , 2010, 33rd International Spring Seminar on Electronics Technology, ISSE 2010.

[26]  Wai Lok Woo,et al.  Impact Damage Detection and Identification Using Eddy Current Pulsed Thermography Through Integration of PCA and ICA , 2014, IEEE Sensors Journal.