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1.
Photoacoustics - A nondestructive evaluation technique for thermal and optical characterisation of metal mirrors
SANKARARAMAN S, NAMPOORI V P N, SWAPNA MOHANACHANDRAN NAIR SINDHU, 2018, izvirni znanstveni članek

Opis: 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.
Najdeno v: ključnih besedah
Ključne besede: Photoacoustics, Nondestructive evaluation, Aranmula metal mirror, Reflectivity
Objavljeno: 30.06.2022; Ogledov: 151; Prenosov: 0
.pdf Polno besedilo (1,48 MB)

2.
Nonradiative analysis of adulteration in coconut oil by thermal lens technique
Vimal Raj, Mohanachandran Nair Sindhu Swapna, H. V. Saritha Devi, Sankaranarayana Iyer Sankararaman, 2019, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...thermal diffusivity, thermal lens technique, coconut oil, nondestructive evaluation...
Ključne besede: thermal energy storage, thermal diffusivity, thermal lens technique, coconut oil, nondestructive evaluation
Objavljeno: 05.07.2022; Ogledov: 112; Prenosov: 0
.pdf Polno besedilo (740,06 KB)

3.
Nondestructive radiative evaluation of adulteration in coconut oil
Vimal Raj, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman, 2018, izvirni znanstveni članek

Najdeno v: ključnih besedah
Ključne besede: nondestructive evaluation, radiative process, adulteration, coconut oil
Objavljeno: 05.07.2022; Ogledov: 136; Prenosov: 3
.pdf Polno besedilo (717,57 KB)
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Nondestructive Evaluation of Surface Roughness of Thin Films through Fractal Analysis, S Soumya
SWAPNA MOHANACHANDRAN NAIR SINDHU, 2017, izvirni znanstveni članek

Najdeno v: ključnih besedah
Ključne besede: Nondestructive Evaluation, Surface Roughness, Thin Films, Fractal Analysis
Objavljeno: 05.07.2022; Ogledov: 111; Prenosov: 0
.pdf Polno besedilo (251,90 KB)

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