Results 171 to 180 of about 5,622 (205)

Phase-Locked Image Acquisition In Thermography

SPIE Proceedings, 1989
Phase-locked detection is a very useful instrumentation technique. It can be used whenever the desired signal is phase-coherent with another reference signal. Very frequently, the reference signal is, or can be derived from, the periodic external stimulus which is responsible for the signal in the first place.
P. K. Kuo, T. Ahmed, Huijia Jin, R. L. Thomas   +3 more
openaire   +1 more source

Lock-in thermography with a focal plane array

Measurement Science and Technology, 2003
A focal plane array is used in a lock-in infrared thermography set-up. Two procedures are used to verify the validity of the phase lags given by the numerical lock-in. The first one makes use of a body with a periodically modulated emission in near and middle infrared.
Horny, Nicolas, Lannoy, Bruno
openaire   +2 more sources

Parameters in lock-in thermography of CFRP laminates

Materials Testing, 2016
AbstractActive thermography with lock-in excitation is a nondestructive testing method that is also feasible for testing of carbon fiber reinforced polymers (CFRP). For validating the method extensive investigations were done during a research project in order to advance a standardization process. The most important parameters of optical and ultrasonic
Philipp Myrach, Christiane Maierhofer, Markus Rahammer, Marc Kreutzbruck   +3 more
openaire   +1 more source

Lock-in Thermography Characterization of Photothermal Transparent Thin Films

2025 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
This study evaluates the capabilities of a new Lock-in Thermography device for characterizing photothermal thin films. Lock-in Thermography, a sensitive imaging technique, is used to detect thermal variations, particle aggregation, and material inhomogeneities.
Gabriella Butler, Hannah Carter, Dardan Bajrami, Sagar Shrestha, Donglu Shi, Mathias Bonmarin   +5 more
openaire   +1 more source

Analysis of Defective Carbon-Epoxy by Means of Lock-in Thermography

Research in Nondestructive Evaluation, 2000
The attention of the present work is focused on the analysis of defects in carbon-epoxy laminates. Different specimens are manufactured by varying the laminate orientation code, the weave type (preimpregnated or nonimpregnated), and the kind of defect. In particular, defects such as inclusions of spurious materials, delamination, and localized lack or ...
GIORLEO, GIUSEPPE, MEOLA, CAROSENA, SQUILLACE, ANTONINO   +2 more
openaire   +3 more sources

LOCK-IN THERMOGRAPHY IN DETECTION OF OSMOTIC DAMAGE

2016
The lock-in thermography is a powerful NDT method capable of vizualizing osmotic processes in composite structure where conventional aproach is inaccurate.
Domazet, Željko, Bagavac, Petra, Krstulović-Opara, Lovre   +2 more
openaire   +2 more sources

Lock-in Thermography Investigation of Solar Modules

2011
Lock-in thermography (LIT) can be used both for single solar cells and for modules consisting of a series connection of single cells. Until now LIT has been used nearly exclusively for single cells and only rarely for modules, which have been investigated only by standard (steady-state) thermography.
Breitenstein, O., Straube, H.
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

Non-destructive evaluation of aerospace materials with lock-in thermography

Engineering Failure Analysis, 2006
Abstract The attention of the present study was focused on the aid provided by lock-in thermography for non-destructive evaluation of aerospace materials and structures. The experimental analysis was performed by testing several specimens, which were made of different materials employed in the fabrication of aircraft (composites, hybrid composites ...
MEOLA, CAROSENA, CARLOMAGNO, GIOVANNI MARIA, SQUILLACE, ANTONINO, A. Vitiello   +3 more
openaire   +4 more sources

Inspection of aerospace materials by pulsed thermography, lock-in thermography, and vibrothermography: a comparative study

SPIE Proceedings, 2007
Inspection of aerospace components has always been a challenge. Infrared thermography has demonstrated to be a useful tool for this matter. In this paper, we offer a comparative study involving three active techniques: pulsed thermography, lock-in thermography and vibrothermography.
Clemente Ibarra-Castanedo, Marc Genest, Stéphane Guibert, Jean-Marc Piau, Xavier P. V. Maldague, Abdelhakim Bendada   +5 more
openaire   +1 more source