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Degradation of the diffuse reflectance of Spectralon under low-level irradiation

W Möller, K-P Nikolaus and A Höpe

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SpectralonTM is a well known diffuse reflectance standard. Although ageing effects of Spectralon under high-level VUV and air UV irradiation have been reported, Spectralon is assumed to be stable under the normal radiation conditions used for calibration in standard facilities. In this paper, ageing effects of Spectralon under low-level irradiation and in the dark are presented. It has been found that ageing is mainly affected by four parameters: wavelength of radiation, irradiance level, radiant exposure (dose) and storage time of the samples. Therefore, the use of SpectralonTM as a transfer standard in international comparisons and maintenance of reference values is discussed.


PACS

42.72.Bj Visible and ultraviolet sources

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

06.20.F- Units and standards

Subjects

Condensed matter: electrical, magnetic and optical

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 1 (February 2003)

Published 7 February 2003



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