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Proceedings Paper

Temperature dependence of the reflectance of metals at visible wavelengths
Author(s): Sandip Maity; Ayan Banerjee; Chayan Mitra
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Paper Abstract

Non-contact temperature measurement is a preferred technique for rotating, hazardous and inaccessible objects. A major challenge for IR thermometry is the dependence of metal emissivity on wavelength and temperature. Optical reflectivity of metals is known to depend on metal temperature, plasma frequency of metal, angle and wavelength of the incident light. A major challenge in reflectance based temperature measurement techniques is the dependence of the reflectance on the surface roughness of the target metal. Sudden change in surface roughness (related or unrelated to temperature) can lead to spurious changes in reflectance irrespective of the temperature. To mitigate the surface roughness effect, we have investigated the speckle pattern emanating from the surface irregularities on the metal. An initial measurement on the speckle pattern also shows an enhanced sensitivity in temperature measurement of the surface that is a function of the inherent surface properties of the metal.

Paper Details

Date Published: 1 September 2010
PDF: 7 pages
Proc. SPIE 7792, Reflection, Scattering, and Diffraction from Surfaces II, 77920D (1 September 2010); doi: 10.1117/12.856785
Show Author Affiliations
Sandip Maity, GE Global Research (India)
Ayan Banerjee, Indian Institute of Science Education and Research (India)
Chayan Mitra, GE Global Research (India)

Published in SPIE Proceedings Vol. 7792:
Reflection, Scattering, and Diffraction from Surfaces II
Zu-Han Gu; Leonard M. Hanssen, Editor(s)

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