Reconstruction of thermal properties of inhomogeneous materials from one dimension to two dimensions

Abstract

Based on one-dimensional theory of thermal wave reconstruction, a two-dimensional theory of thermal conductivity profile reconstruction is developed. The important developments in the two-dimensional (2D) inverse problem are that a line source is used instead of the source with a large cross section in one dimension, and a finite difference method is adopted for the numerical solution of the 2D heat equation. Numerical simulations demonstrate that this approach is effective and stable even with 5% random noise disturbance in the signal.

Photoacoustic Imaging with Multiple-Wavelength Light-Emitting Diodes

“…The remainder of the apparatus is the same as described in the previous publications. 1,[3][4][5][6]…”

“…Photoacoustic (PA) [1][2][3][4][5][6][7] and thermal lens [8][9][10][11] imaging methods, both of which are based on the photothermal energy conversion of absorbed light energy into heat, 12) have been used for spectroscopic measurements on the microscopic scale. The former includes pollen detection with a photoacoustic microscope (PAM).…”