02.05.2016 von 17:15 bis 18:45
Institut Ostufer, Kaiserstraße 2, 24143 Kiel, Raum: Geb. D, "Aquarium"
Titel: "Lock-in
Thermography -- A Universal Tool for Evaluating Electronic Devices and
Materials"
Abstract:
Lock-in Thermography (LIT) is a special variant of the well-known
infrared thermography method, which uses a thermocamera detecting light
in the thermal radiation range (typically 3 - 5 µm). The camera is
connected to a computer, which switches certain power dissipation (heat)
sources in the imaged object periodically on and off at a certain
frequency. The incoming images are evaluated according to the lock-in
principle, which is equivalent to connecting each image pixel to a
lock-in amplifier. The primary result of a LIT measurement are the
temperature modulation amplitude image and the phase image, which is a
measure of the time delay of the surface temperature modulation with
respect to the power modulation. Advantages of LIT compared to
conventional (steady-state) thermography are a drastically improved
sensitivity due to its averaging nature and a suppression of the lateral
heat diffusion due to its dynamic nature.
In this talk the realization of LIT will be explained and a number of
applications will be reported. Since the modulated heat sources in the
investigated object can be of very different nature, LIT may be applied
to study a lot of different physical problems. This talk reports on the
application of LIT to non-destructive evaluation (looking below the
surface of bodies), local efficiency analysis of solar cells,
measurement of Peltier coefficients, failure analysis of integrated
circuits, imaging of water adsorption in biological specimens, and
investigation of spin-caloritronic effects in magnetic materials.
Prof. Adelung
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