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Measurement strategies

: Breitenstein, O.; Warta, W.; Schubert, M.C.


Breitenstein, O.; Warta, W.; Schubert, M.C.:
Lock-in Thermography. Third edition : Basics and use for evaluating electronic devices and materials
Cham: Springer Nature, 2018 (Springer Series in Advanced Microelectronics 10)
ISBN: 978-3-319-99824-4 (Print)
ISBN: 978-3-319-99825-1 (Online)
DOI: 10.1007/978-3-319-99825-1
Aufsatz in Buch
Fraunhofer ISE ()

In the following sections some practical aspects of using lock-in thermography in the functional diagnostics of electronic components will be discussed and illustrated by measurement examples of a typical, thermally thin sample (solar cell) and a thermally thick one (integrated circuit). All these discussions are based on the theoretical findings presented in Chap. 4. Section 5.1 discusses the question which of the images available from a lock-in thermography experiment (0∘ image, −90∘ image, amplitude image, phase image, or 0∘/−90∘ image) is most appropriate to display certain details of different heat source distributions. In Sect. 5.2, the influence of the lock-in frequency on the obtained signal amplitude and lateral resolution of the thermograms will be discussed and demonstrated for different heat source geometries. In Sect. 5.3, the influence of a spatially varying IR emissivity will be discussed (emissivity contrast), and different ways to overcome this influence will be introduced and demonstrated. Finally, in Sect. 5.4 a simple technique will be introduced to distinguish Joule type heating from Peltier effects in lock-in thermography experiments on resistive samples.