Thermal tomography with unknown boundary

Nuutti Hyvönen, Lauri Mustonen

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

118 Lataukset (Pure)

Abstrakti

Thermal tomography is an imaging technique for deducing information about the internal structure of a physical body from temperature measurements on its boundary. This work considers time-dependent thermal tomography modeled by a parabolic initial/boundary value problem without accurate information on the exterior shape of the examined object. The adaptive sparse pseudospectral approximation method is used to form a polynomial surrogate for the dependence of the temperature measurements on the thermal conductivity, the heat capacity, the boundary heat transfer coefficient, and the body shape. These quantities can then be efficiently reconstructed via nonlinear, regularized least squares minimization employing the surrogate and its derivatives. The functionality of the resulting reconstruction algorithm is demonstrated by numerical experiments based on simulated data in two spatial dimensions.

AlkuperäiskieliEnglanti
SivutB662-B683
JulkaisuSIAM Journal on Scientific Computing
Vuosikerta40
Numero3
DOI - pysyväislinkit
TilaJulkaistu - 1 tammikuuta 2018
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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