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

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

Full text not available from this repository.

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

Abstract

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.

Document Type:Article
Title:Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm
Authors:
AuthorsInstitution or Email of Authors
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
Date:19 October 2009
Journal or Publication Title:Review of Scientific Instruments
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:80
DOI:10.1063/1.3246815
Page Range:p. 105104
Status:Published
Keywords:measurement Seebeck coefficient, spatial resolution, inhomogeneities, thermopower analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Air Traffic and Weather (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Dr. Knud Zabrocki
Deposited On:24 Nov 2009 16:48
Last Modified:04 Apr 2013 16:17

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