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Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm

Wu, K.-H. und Hung, C.-I. und Ziolkowski, P. und Platzek, D. und Karpinski, G. und Stiewe, C. und Müller, E. (2009) Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm. Review of Scientific Instruments, 80, Seite 105104. DOI: 10.1063/1.3246815.

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Offizielle URL: http://link.aip.org/link/?RSINAK/80/105104/1

Kurzfassung

A potential Seebeck microprobe apparatus is described such that a profile of Seebeck coefficients can be detected on a material sample surface for thermopower investigations. Due to its spatially resolved limit on detecting small inhomogeneities of dopants or composition changes, we here propose a constructive combination of numerical modeling and practical measurement to improve the spatial resolution by deconvolution algorithm. The relevant transfer function, obtained from numerical calculations, was successfully applied on real measurement data. Besides, an improvement in detecting the 1.5 µm inhomogeneity has been achieved by applying one transfer function of the known tip setup on a set of Seebeck line scan signals, obtained with 6 µm tip-sample contact length, 3 µs signal capture time after contact, and 0.75 µm scan period. The result showed that a system theoretical approach in terms of deconvolution algorithm could theoretically enhance the spatial resolution anyway, but is practically limited by the systemic preconditions (tip size, signal capture time, and scan period) and the signal to noise ratio of the captured thermovoltages. Therefore, we provide a clear understanding of systemic preconditions and their impacts on the detection of small inhomogeneities and thus the performance in the thermopower analysis.

Dokumentart:Zeitschriftenbeitrag
Titel:Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Wu, K.-H.Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Hung, C.-I.Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Ziolkowski, P.German Aerospace Center, Köln, Germany
Platzek, D.German Aerospace Center, Köln, Germany
Karpinski, G.German Aerospace Center, Köln, Germany
Stiewe, C.German Aerospace Center, Köln, Germany
Müller, E.German Aerospace Center, Institute of Materials Research, Köln, Germany
Datum:19 Oktober 2009
Erschienen in:Review of Scientific Instruments
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:80
DOI :10.1063/1.3246815
Seitenbereich:Seite 105104
Status:veröffentlicht
Stichwörter:measurement Seebeck coefficient, spatial resolution, inhomogeneities, thermopower analysis
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Luftverkehr und Wetter (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Thermoelektrische Materialien und Systeme
Hinterlegt von: Dr. Knud Zabrocki
Hinterlegt am:24 Nov 2009 16:48
Letzte Änderung:04 Apr 2013 16:17

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