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Measurement of Contrast and Spatial Resolution for the Photothermal Imaging Method

Department of Mechanical Engineering, Ajou University, Suwon, Gyeonggi-do 16499, Korea
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Appl. Sci. 2019, 9(10), 1996; https://doi.org/10.3390/app9101996
Received: 12 April 2019 / Revised: 29 April 2019 / Accepted: 13 May 2019 / Published: 15 May 2019
(This article belongs to the Section Optics and Lasers)
PDF [1396 KB, uploaded 15 May 2019]

Abstract

Analyzing the quality of images generated from an imaging method is essential for determining the limits and applicability of that method. This study analyzed the quality of images resulting from a photothermal imaging method by applying the line spread function and the modulation transfer function to the spatial resolution and contrast, on the basis of certain parameters of the photothermal imaging method for a copper-resin double-layered structure. The parameters are the ratio of the first-layer thickness to the thermal diffusion length (Lf/Ld) and the ratio of the pump-beam radius to the thermal diffusion length (Rb/Ld). The phase delay profile (edge response function, ERF) of the subsurface structure derived from the photothermal imaging method becomes dimensionless upon division by the thermal diffusion length; as the ratio Lf/Ld increases, the spatial resolution and contrast increase.
Keywords: photothermal imaging; image quality; contrast; spatial resolution; MTF; ERF; LSF photothermal imaging; image quality; contrast; spatial resolution; MTF; ERF; LSF
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kim, M.; Yoo, J.; Kim, D.-K.; Kim, H. Measurement of Contrast and Spatial Resolution for the Photothermal Imaging Method. Appl. Sci. 2019, 9, 1996.

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