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Pyroreflectrometry to determine the true temperature and optical properties of surfaces

Hernandez, Daniel and Sans, J.L. and Pfaender, Markus (2006) Pyroreflectrometry to determine the true temperature and optical properties of surfaces. In: 13th International symposium on concentrated solar power and chemical energy technologies. SolarPACES 2006, 2006-06-20 - 2006-06-23, Seville, Spain.

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Abstract

In this paper we present a theoretical analysis and experimental results of a pyrometric temperature measurement method based on a two color pyroreflectometer (working wavelengths 1.3 and 1.55µm) equipped with an optical fiber probe. By measuring simultaneously the radiance temperature and the normal reflectivity, the true temperature of the measurement target can be determined without the previous knowledge of the optical properties of the sample. The method is based on the introduction and the definition of the diffusivity factor and the assumption that it is equal for the two wavelength. Besides the experimental results the sources of errors and their impact on the method accuracy and the performance of the setup are discussed. The quality of the measurement results demonstrates the utility of the pyroreflectometry in a domain where fundamental parameters, such as the temperature and radiative properties, present the major measurement difficulties. The diffusivity factor appears not only a step to determine the true temperature but also as a parameter very useful to evaluate the diffusing behavior of opaque materials.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Pyroreflectrometry to determine the true temperature and optical properties of surfaces
Authors:
AuthorsInstitution or Email of Authors
Hernandez, DanielUNSPECIFIED
Sans, J.L.UNSPECIFIED
Pfaender, MarkusUNSPECIFIED
Date:June 2006
Journal or Publication Title:13th International symposium on concentrated solar power and chemical energy technologies
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:two-colour pyroreflectrometry, temperature measurement, diffusivity factor, optical properties,
Event Title:SolarPACES 2006
Event Location:Seville, Spain
Event Type:international Conference
Event Dates:2006-06-20 - 2006-06-23
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Hochtemperatursysteme (old)
Location: other
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Markus Pfänder
Deposited On:04 Jan 2007
Last Modified:27 Apr 2009 13:04

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