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Access Help Desk aluminium back surface boundary characterisation problem coefficients comprise considered contrast evolution contrast inflection contrast response corresponding cutout defect depth defect shape DFC specimen diffusion equation efficiency eigenvalues evolution of contrast experimental data Figure finite element method flaw depth flawed region gradient half peak contrast heat conduction problem heat diffusion effects infrared interface inverse problem inverse thermal problem Langley Research Center lateral extent lateral heat diffusion low sampling material loss method NASA Access Help NASA STI Program noise non-uniform illumination numerically generated data objective function one-dimensional optimisation process paint layer thicknesses performed precision and robustness present study presented in Fig reference thickness sampling rate scaling parameter scientific and technical solved spatial steady STI Program Office strategy substrate surface nodal point technique thermal conductivity thermal diffusivity thermal imaging thermal properties Thermal Response Measurements thickness L2 thickness ratio two-dimensional problem wave