Results 171 to 180 of about 5,430 (219)

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

Lock-in thermography for nondestructive evaluation of materials

Revue Générale de Thermique, 1998
Abstract Photothermal radiometry allows for remote measurement of local harmonic heat transport where the phase angle (between remote optical energy deposition and resulting temperature modulation) is sensitive to subsurface features or defects.
Datong Wu, Gerd Busse
openaire   +1 more source

Scan Chain Debug Using Dynamic Lock-In Thermography

International Symposium for Testing and Failure Analysis, 2011
Abstract In this paper, we demonstrate that lock-in thermography (LIT) appears as a key and complementary technique for Failure Analysis across different use cases. Even if the failure requires a complex emulation setup, thanks to a specific capability of our thermal system, this kind of failure can be addressed. In our FA case study, we
L. Forli, B. Picart, A. Reverdy, R. Schlangen   +3 more
openaire   +1 more source

Phase lock-in thermography for metal walls characterization

2013 3rd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA), 2013
Phase lock-in thermography is a non-destructive and contactless technique used for characterization of materials. We present in this paper a new method to characterize the thermal diffusivity of a material by knowing, at different frequencies, the phase shift between a modulated laser power and the thermal signal of a plate sample by the laser heating.
S. Pham Tu Quoc, G. Cheymol, A. Semerok
openaire   +1 more source

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.
Butler, Gabriella, Carter, Hannah, Bajrami, Dardan, Shrestha, Sagar, Shi, Donglu, Bonmarin, Mathias   +5 more
openaire   +1 more source

Inductively excited lock-in thermography for PCB-vias

2012 4th Electronic System-Integration Technology Conference, 2012
A novel non-destructive evaluation method of inductively excited lock-in thermography (called InduLIT in this paper) is investigated for crack detection on PCB-vias. Previous publications already showed the working principle. Now the crack inspection of PCB-vias using flat inductors is investigated in detail.
J. Bohm, K. Meier, K.-J. Wolter
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

Stress monitoring and analysis using lock-in thermography

Insight - Non-Destructive Testing and Condition Monitoring, 2010
An advanced non-destructive evaluation technique based on a thermal method and lock-in principles, known as thermoelastic stress analysis (TSA), is proposed for accurate stress measurements. Traditionally, strain gauges mounted on components of interest are used to measure stresses indirectly.
S George, S Goravar, D Mishra, M T Shyamsunder, P Sharma, G K Padmashree, P S Kumar, P Bremond, K Mukherjee   +8 more
openaire   +1 more source

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