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Title:Photoacoustics - A nondestructive evaluation technique for thermal and optical characterisation of metal mirrors
Authors:ID Swapna, Mohanachandran Nair Sindhu, UNIVERSITY OF KERALA (Author)
ID V P N, NAMPOORI, CUSAT (Author)
ID S, Sankararaman, UNIVERSITY OF KERALA (Author)
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Photoacoustic technique has emerged as a powerful tool for nondestructive evaluation and characterization. The high signal to noise ratio, sensitivity, and the least quantity of sample required make the technique suitable for wide range of applications. The intensity modulated laser beam focused on to the sample in the photoacoustic cell generates acoustic waves. Analysis of the acoustic signal enables the measurement of thermal and optical properties of the material. In the present work, the photoacoustic technique has been extended to find the thermal diffusivity and to demonstrate how the technique can be used for measuring optical reflection coefficient of a precious metal mirror—Aranmula mirror. The mirror being metal with high reflection coefficient, it finds application in optical instrumentation. The mirror is subjected to morphological characterization by atomic force microscopy and field emission scanning electron microscopy. The elemental and structural characterizations are done by energy dispersive x-ray spectroscopy, X-ray dot mapping, and X-Ray diffraction analysis. The fractal dimension of the particle distribution over the surface provides information about the surface roughness. The box-counting and power spectral fractal dimensions are found to be around 1.63 and 1.65 respectively.
Keywords:Photoacoustics, Nondestructive evaluation, Aranmula metal mirror, Reflectivity
Publication version:Version of Record
Year of publishing:2018
Number of pages:9
Numbering:3, 47
PID:20.500.12556/RUNG-7432 New window
COBISS.SI-ID:113403395 New window
DOI:10.1007/s12596-018-0471-0 New window
NUK URN:URN:SI:UNG:REP:V3RBACDP
Publication date in RUNG:30.06.2022
Views:3214
Downloads:0
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SWAPNA, Mohanachandran Nair Sindhu, V P N, NAMPOORI and S, Sankararaman, 2018, Photoacoustics - A nondestructive evaluation technique for thermal and optical characterisation of metal mirrors. Journal of Optics [online]. 2018. Vol. 3, no. 47. [Accessed 3 April 2025]. DOI 10.1007/s12596-018-0471-0. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=7432
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Record is a part of a journal

Title:Journal of Optics
Year of publishing:2018
ISSN:Journal of Optics

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:29.06.2022

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