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High-Transmission Filters for Realizing Gray-Body Radiators.
- Source :
-
International Journal of Thermophysics . Aug2015, Vol. 36 Issue 8, p1743-1756. 14p. - Publication Year :
- 2015
-
Abstract
- Calibration of infrared radiation thermometers at non-unity emissivity settings is a poorly solved problem for establishment of traceability to meet user needs, for instruments with both fixed and variable emissivity setting functions. A variable-temperature gray-body radiator having a constant value of emissivity independent of both wavelength and temperature can be a perfect tool for the calibration purpose. In this paper, two types of high-transmittance optical neutral density filters, one utilizing a rotating-sector optical chopper, and another of a wire-mesh type, are shown to perform well with a precise transmittance between 90 % and 100 % in the wide infrared wavelength range. These optical filters in combination with a blackbody cavity traceable to ITS-90 can realize reliable gray-body radiation. These methods are applied successfully to several models of infrared thermometers operated in the emissivity correction mode. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0195928X
- Volume :
- 36
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- International Journal of Thermophysics
- Publication Type :
- Academic Journal
- Accession number :
- 109171690
- Full Text :
- https://doi.org/10.1007/s10765-015-1862-y