Toivanen, JM;
Tarvainen, T;
Huttunen, JMJ;
Savolainen, T;
Pulkkinen, A;
Orlande, HRB;
Kaipio, JP;
(2017)
Thermal tomography utilizing truncated Fourier series approximation of the heat diffusion equation.
International Journal of Heat and Mass Transfer
, 108
(Part A)
pp. 860-867.
10.1016/j.ijheatmasstransfer.2016.12.060.
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Abstract
In a thermal tomography measurement setup, a physical body is sequentially heated at different source locations and temperature evolutions are measured at several measurement locations on the surface of the body. Based on these transient measurements, the thermal conductivity, the volumetric heat capacity and the surface heat transfer coefficient of the body are estimated as spatially distributed parameters, typically by minimizing a modified data misfit functional between the measured data and the data computed with the estimated thermal parameters. In thermal tomography, heat transfer is modeled with the time-dependent heat diffusion equation for which direct time domain solving is computationally expensive. In this paper, the computations of thermal tomography are sped up by utilizing a truncated Fourier series approximation approach. In this approach, a frequency domain equivalent of the time domain heat diffusion equation is solved at multiple frequencies and the solutions are used to obtain a truncated Fourier series approximation for the solution and the Jacobian of the time domain heat transfer problem. The feasibility of the approximation is tested with simulated and experimental measurement data. When compared to a previously used time domain approach, it is shown to lead to a significant reduction of computation time in image reconstruction with no significant loss of reconstruction accuracy.
| Type: | Article |
|---|---|
| Title: | Thermal tomography utilizing truncated Fourier series approximation of the heat diffusion equation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ijheatmasstransfer.2016.12.060 |
| Publisher version: | http://dx.doi.org/10.1016/j.ijheatmasstransfer.201... |
| Language: | English |
| Additional information: | © 2016 Elsevier Ltd. All rights reserved. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Technology, Thermodynamics, Engineering, Mechanical, Mechanics, Engineering, Thermal tomography, Truncated Fourier series approximation, Inverse problem, Thermal conductivity, Volumetric heat capacity, Surface heat transfer coefficient, Non-destructive testing, STATISTICAL INVERSE PROBLEMS, MODEL-REDUCTION, LOCK-IN, THERMOGRAPHY, CONDUCTIVITY, RECONSTRUCTION, CAPACITY, ELEMENTS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1540605 |
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