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
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.
|Title:||Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm|
|Date:||19 October 2009|
|Journal or Publication Title:||Review of Scientific Instruments|
|In ISI Web of Science:||Yes|
|Page Range:||p. 105104|
|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|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L VU - Air Traffic and Environment|
|DLR - Research theme (Project):||L - Air Traffic and Weather|
|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|
Repository Staff Only: item control page