Two-Dimensional Reconstructed Image of a Subsurface Structure Using Continuous Scanned Photo thermal Imaging
简介：This study presents the two-dimensional(2D)image of a subsurface structure reconstructed using an imaging method based on the photothermal effect.The photothermal imaging method is based on the deflection method using two lasers:pump and probe lasers.A continuous scanning technique is proposed for 2D(x-and y-directions)surface scanning.The continuous scanning method is compared with the conventional point-by-point scanning technique,and a low-pass fast Fourier transform filter and a Marr-Hildreth detector are found to produce significant results.The photothermal imaging method with continuous 2D surface scanning is performed on three copper-resin double-layer samples with differentsubsurface structures.The subsurface structures of the copper-resin double-layer samples comprise a square block of 5×5 mm2 area and blocks shaped as the alphabet letters"T"and"F".The letters are 3 mm wide and 10×13 mm2 in area.All three shapes are 1 mm thick and located at a depth of 0.5 mm from the surface of the copper block.The reconstructed photothermal images show an absolute error within 0.122 mm compared with the actual subsurface structure,equivalent to a 2.3％relative error.展开
关键词：Photothermal effectphotothermal imagingnondestructive testreconstructionvisualizationtomography
在线出版日期：2025-04-17 （网站首发日期）
