Shape Effect on Blind Frequency for Depth Inversion in Pulsed Thermography
نویسندگان
چکیده
In this paper, a study is presented indicating that the specimen shape, for orientation smaller than about 30°, does not affect the blind frequency obtained in Pulsed Phase Thermography processing. Therefore, it makes this measurement suitable for depth inversion in the case of non-flat shaped specimens. Theory and experimental results are discussed.
منابع مشابه
Non-destructive Evaluation of Composites Materials by Pulsed-phase Thermography: Depth Inversion
This work is focused in the application of Pulsed-Phase Thermography (PPT) to non-destructive evaluation of composite materials. In this approach, the composite sample is heated by a thermal pulse briefly and recording the surface temperature decay with an infrared camera. Data processing and depth inversion is carried out by extracting and analyzing the response of the sample on the frequency ...
متن کاملQuantitative Subsurface Defect Evaluation by Pulsed Phase Thermography : Depth Retrieval with the Phase
Pulsed Phase Thermography (PPT) is a NonDestructive Testing and Evaluation (NDT&E) technique based on the Fourier Transform that can be thought as being the link between Pulsed Thermography, for which data acquisition is fast and simple; and Lock-In thermography, for which depth retrieval is straightforward. A new depth inversion technique using the phase obtained by PPT is proposed. The techni...
متن کاملEarly detection of thermal contrast in pulsed stimulated thermography
Stimulated Infrared Thermography (TIS) is a fast and global method for NonDestructive Evaluation (NDE). Among the recently emerging NDE methods, it is probably the less intrusive one since it really needs no contact at all with the tested structure. A new inversion technique, using an early detection of the contrast, is presented to demonstrate how it recovers the depth of the defects with accu...
متن کاملInfluence of shielding gas composition on weld structure in pulsed Nd: YAG laser welding
This work studied the effect of additions of carbon dioxide to argon shielding gas on the weld shape and microstructure of ST14 steel in pulsed Nd: YAG laser welding. By additions of carbon dioxide up to 15%,the weld area and depth/width ratio decreases while rising of carbon dioxide up to 25% causes increasing of weld area and depth/width ratio. It is observed that the weld metal microstructur...
متن کاملAutomatic Algorithm for Quantitative Pulsed Phase Thermography Calculations
Pulsed Phase Thermography (PPT) has been successfully applied for defect detection purposes on a variety of materials. A great deal of work has been done to evaluate the potential of PPT for quantitative applications, using for instance statistical methods, Neural Networks or wavelets (Ibarra-Castanedo et al., 2004). However, calibration requirements and lengthy computation subroutines, preclud...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006