Stability properties of an inverse parabolic problem with unknown boundaries |
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Authors: | Michele Di Cristo Luca Rondi Sergio Vessella |
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Affiliation: | (1) Dipartimento di Scienze Matematiche, Università degli Studi di Trieste, Italy;(2) Dipartimento di Matematica per le Decisioni, Università degli Studi di Firenze, Italy |
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Abstract: | We treat the stability issue for an inverse problem arising from non-destructive evaluation by thermal imaging. We consider the determination of an unknown portion of the boundary of a thermic conducting body by overdetermined boundary data for a parabolic initial-boundary value problem. We obtain that when the unknown part of the boundary is a priori known to be smooth, the data are as regular as possible and all possible measurements are taken into account, the problem is exponentially ill-posed. Then, we prove that a single measurement with some a priori information on the unknown part of the boundary and minimal assumptions on the data, in particular on the thermal conductivity, is enough to have stable determination of the unknown boundary. Given the exponential ill-posedness, the stability estimate obtained is optimal. AMS 2000 Mathematics Subject Classification. Primary 35R30, Secondary 35B60, 33C90 |
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Keywords: | Inverse problems Stability Parabolic equations Bessel functions Unique continuation |
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