Temperature dependence of the reflectance of metals at visible wavelengths

Sandip Maity; Ayan Banerjee; Chayan Mitra

doi:10.1117/12.856785

1 September 2010 Temperature dependence of the reflectance of metals at visible wavelengths

Sandip Maity, Ayan Banerjee, Chayan Mitra

Proceedings Volume 7792, Reflection, Scattering, and Diffraction from Surfaces II; 77920D (2010) https://doi.org/10.1117/12.856785
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

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.

Citation Download Citation

Sandip Maity, Ayan Banerjee, and Chayan Mitra "Temperature dependence of the reflectance of metals at visible wavelengths", Proc. SPIE 7792, Reflection, Scattering, and Diffraction from Surfaces II, 77920D (1 September 2010); https://doi.org/10.1117/12.856785

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