Extracting Individual Contributions From Their Mixture: A Blind Source Separation Approach

被引:2
作者
de Wit, T. Dudok [1 ]
机构
[1] Univ Reg Ctr, LPC2E, Observ Sci, 3A Ave Rech Sci, F-45071 Orleans 2, France
关键词
Blind source separation; plasma fluctuations; solar EUV irradiance; INDEPENDENT COMPONENT ANALYSIS; TOKAMAK; DECOMPOSITION; ALGORITHMS; TRANSPORT;
D O I
10.1002/ctpp.201000052
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Multipoint or multichannel observations in plasmas can frequently be modelled as an instantaneous mixture of contributions (waves, emissions, ... ) of different origins. Recovering the individual sources from their mixture then becomes one of the key objectives. However, unless the underlying mixing processes are well known, these situations lead to heavily underdetermined problems. Blind source separation aims at disentangling such mixtures with the least possible prior information on the sources and their mixing processes. Several powerful approaches have recently been developed, which can often provide new or deeper insight into the underlying physics. This tutorial paper briefly discusses some possible applications of blind source separation to the field of plasma physics, in which this concept is still barely known. Two examples are given. The first shows how concurrent processes in the dynamical response of the electron temperature in a tokamak can be separated. The second example deals with solar spectral imaging in the Extreme UV and shows how empirical temperature maps can be built. (c) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码:143 / 151
页数:9
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