Results 181 to 190 of about 5,430 (219)

Laser Lock-In Thermography for Fatigue Crack Detection

Key Engineering Materials, 2013
This study proposes a new nondestructive evaluation methodology named laser lock-in thermography (LLT) for fatigue crack detection. LLT utilizes a high power continuous wave (CW) laser as a heat generation source for lock-in thermography instead of commonly used flash and halogen lamps.
Yun Kyu An, Ji Min Kim, Hoon Sohn
openaire   +1 more source

Applications of pulse heating thermography and lock-in thermography to quantitative nondestructive evaluations

Infrared Physics & Technology, 2002
This paper describes several experimental investigations of newly developed thermographic NDT techniques based on the transient temperature measurements. Several experimental results of the pulse heating thermographic NDT and the lock-in thermographic NDT are shown.
Takahide Sakagami, Shiro Kubo
openaire   +1 more source

THE USE OF LOCK-IN THERMOGRAPHY IN INDUSTRIAL APPLICATIONS

Nondestructive Testing and Evaluation, 2000
Abstract A feasibility study is made to search if lock-in thermography can be usefully employed in non-destructive evaluations of different materials of industrial interest. Several specimens, made of different materials and with defects artificially created to simulate either delaminations, or cracks, or inclusions of spurious materials, are ...
GIORLEO, GIUSEPPE, MEOLA, CAROSENA, SQUILLACE, ANTONINO   +2 more
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Lock-in Thermography Image Processing

HDKBR info, 2016
Composite materials have appropriate thermal properties for detection flaws by means of non- destructive infrared thermography methods. Infrared thermography methods are based on tracking heat flow that has been induced by flood lamps. Lock-in thermography, as one of infrared thermography methods, is used in detection of flaws.
openaire   +1 more source

Through Package Defect Localization by Lock-In Thermography

Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT), 2011
Root cause analysis for package defects is currently performed by de-processing the package until such defects can be physically seen. However, many such defects within the package are removed, or are confused with defects created during de-processing itself.
Rudolf Schlangen, Herve Deslandes, Toru Toda, Toshinobu Nagatomo, Shigeki Sako, Hiromichi Sawaya   +5 more
openaire   +1 more source

Can Luminescence Imaging Replace Lock-in Thermography on Solar Cells?

IEEE Journal of Photovoltaics, 2011
The purpose of this paper is a detailed comparison of selected luminescence and lock-in thermography (LIT) results on one exemplary sample and the drawing of corresponding conclusions. Our focus is on solar cells, but some investigations on wafers will be discussed as well.
Breitenstein, Otwin, Warta, Wilhelm, Schubert, Martin C., Kwapil, Wolfram, Müller, J., Hinken, David, Bothe, Karsten, Bauer, J.   +7 more
openaire   +1 more source

Vertical cracks characterization using lock-in thermography: II finite cracks

Measurement Science and Technology, 2014
The aim of this work is to characterize vertical cracks of finite size and arbitrary shape using optically excited lock-in thermography. In the first place, we have solved the direct problem, which consists of calculating the surface temperature distribution when the shape, size and width of the vertical crack are known.
N W Pech-May, A Oleaga, A Mendioroz, A J Omella, R Celorrio, A Salazar   +5 more
openaire   +1 more source

Non-destructive evaluation of bonded structures with lock-in thermography

Journal of Adhesion Science and Technology, 2003
Lock-in thermography is employed for non-destructive evaluation of several types of bonded structures, which are commonly encountered in industrial applications. Specimens were fabricated to simulate: adhesively bonded aluminium joints, which are commonly used in aeronautical and automotive fields; bonds between pipes of poly(vinyl chloride) (PVC ...
C. Meola, G. M. Carlomagno, GIORLEO, Luca   +2 more
openaire   +4 more sources

Lock-in inductive thermography for surface crack detection

Thermosense: Thermal Infrared Applications XL, 2018
Inductive thermography is a non-destructive technique, which can be excellently used for detection of surface cracks in electrically conductive materials. In ferro-magnetic steel even a single short pulse with duration of 50ms up to 1s is enough to induce a Joule heating which makes shallow cracks well detectable in the infrared image sequences. In the
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Nondestructive Evaluation of Materials With Rear Heating Lock-In Thermography

IEEE Sensors Journal, 2007
The detection of small and thin solid slag inclusions in a material is, in general, difficult and it may become a critical task when the component under inspection has complex geometry and/or small dimensions. The attention of this note is focused on the use of back-side heating lock-in thermography for nondestructive evaluation of components with thin
openaire   +2 more sources