A novel interferometric technique to estimate thermal diffusivity of optically transparent solid using isothermal surface velocimetry

Balachandar Settu; Shivaprakash N. C.; Kameswara Rao L.

doi:10.1117/12.2189532

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17 July 2015 A novel interferometric technique to estimate thermal diffusivity of optically transparent solid using isothermal surface velocimetry

Balachandar Settu, Shivaprakash N. C., Kameswara Rao L.

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Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95241Q (2015) https://doi.org/10.1117/12.2189532
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

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.

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Balachandar Settu, Shivaprakash N. C., and Kameswara Rao L. "A novel interferometric technique to estimate thermal diffusivity of optically transparent solid using isothermal surface velocimetry", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95241Q (17 July 2015); https://doi.org/10.1117/12.2189532

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