Download Lock-in Thermography: Basics and Use for Evaluating by Otwin Breitenstein, Wilhelm Warta, Martin Langenkamp PDF
By Otwin Breitenstein, Wilhelm Warta, Martin Langenkamp
This ebook bargains with lock-in thermography (LIT) as a unique energetic dynamic version of the well known IR thermography. It allows a far stronger signal-to-noise ratio (up to 1000x) and a much better lateral solution in comparison to steady-state thermography. The ebook concentrates on functions to digital units and fabrics, however the easy chapters are beneficial in addition for non-destructive assessment. quite a few experimental techniques to LIT are reviewed with designated emphasis to diverse to be had advertisement LIT structures. New LIT functions are reviewed, like Illuminated LIT utilized to sun cells , and non-thermal LIT lifetime mapping. ordinary LIT research case experiences are introduced.
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Extra resources for Lock-in Thermography: Basics and Use for Evaluating Electronic Devices and Materials
In principle, also these frequencies should be avoided for undersampling. Note, however, that for square-pulse heat introduction the basic harmonic has the highest intensity anyway, and higher harmonics of the temperature modulation are naturally strongly damped (see Sect. 5). In fact, as long as only the location of local heat sources has to be imaged by lock-in thermography, it does not matter whether the basic harmonic or any higher harmonic is detected. So for electronic device testing aliasing collisions should not be harmful.
Thus, the phase of the signal indicates whether a heat source is switched on or off by the trigger. The signal value of all regions not affected by this trigger will be zero, irrespectively whether continuous heat is generated there, or not. In this way, the action of different control signals on the operation of the circuit can be independently checked. One example of Sect. 1 demonstrates an application of this type of sophisticated triggering. Even complex control signals can be applied to one or several inputs, if the circuit under test is connected with an intelligent circuit tester.
Component of one period of the T-modulation at different distances from the considered point heat source. These data have been calculated up to the 99th harmonic. For a better comparison, all traces are independently scaled to the same amplitude of their basic harmonic. The distances r refer to the thermal diffusion length , which in silicon is about 1 mm for a lock-in frequency of 30 Hz (see Sect. 1). The smoothing effect and also the expected phase delay with increasing distance are clearly shown.