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Proceedings Paper

A novel interferometric technique to estimate thermal diffusivity of optically transparent solid using isothermal surface velocimetry
Author(s): Balachandar Settu; Shivaprakash N. C.; Kameswara Rao L.
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Paper Abstract

One-dimensional transient heat flow is interpreted as a procession of ‘macro-scale translatory motion of indexed isothermal surfaces’. A new analytical model is proposed by introducing velocity of isothermal surface in Fourier heat diffusion equation. The velocity dependent function is extracted by revisiting ‘the concept of thermal layer of heat conduction in solid’ and ‘exact solution’ to estimate thermal diffusivity. The experimental approach involves establishment of 1 D unsteady heat flow inside the sample through Step-temperature excitation. A novel self-reference interferometer is utilized to separate a ‘unique isothermal surface’ in time- varying temperature field. The translatory motion of the said isothermal surface is recorded using digital camera to estimate its velocity. From the knowledge of thermo-optic coefficient, temperature of the said isothermal surface is predicted. The performance of proposed method is evaluated for Quartz sample and compared with literature.

Paper Details

Date Published: 17 July 2015
PDF: 7 pages
Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95241Q (17 July 2015); doi: 10.1117/12.2189532
Show Author Affiliations
Balachandar Settu, Indian Institute of Science (India)
Shivaprakash N. C., Indian Institute of Science (India)
Kameswara Rao L., Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 9524:
International Conference on Optical and Photonic Engineering (icOPEN 2015)
Anand K. Asundi; Yu Fu, Editor(s)

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