A new optical method for high-accuracy determination of aperture area

E. Ikonen, P. Toivanen, A. Lassila

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)

Abstract

We have developed a direct optical method for aperture area measurement, based on constant, known irradiance over the aperture. The method is described and results of test measurements are given, including wavelength dependence of the effective aperture area. Systematic uncertainty components are studied experimentally to reach a relative uncertainty of 10 -4 for aperture sizes down to 3 mm in diameter. The most important advantages of the direct optical method are that it does not require any reference aperture, it can be applied to apertures of any shape, and the calibration setup is similar to the actual use of the apertures in filter radiometers.

Original languageEnglish
Pages (from-to)369-372
Number of pages4
JournalMetrologia
Volume35
Issue number4
DOIs
Publication statusPublished - 1 Dec 1998
MoE publication typeA1 Journal article-refereed

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