Optical power and transmittance measurements and their use in detector-based realization of the luminous intensity scale

Petri Kaerhae, Antti Lassila, Hanne Ludvigsen, Farshid Manoochehri, Heidi Fagerlund, Erkki Ikonen

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26 Citations (Scopus)


Responsivity calibrations of trap detectors with a cryogenic absolute radiometer and a power-stabilized 543.516-nm He-Ne laser are described. The trap detectors are used as transfer standards of optical power at visible wavelengths because they have a predictable spectral responsivity. New results on transmittance measurements of PRC Krochmann V(λ) filters are presented, especially the angle and temperature dependence of the transmittance. The characterized trap detector and the V(λ) filter are used for a novel realization of the SI base unit of luminous intensity, the candela. Test measurements indicate a good agreement with previous photometric scales.

Original languageEnglish
Pages (from-to)2611-2618
Number of pages8
JournalOptical Engineering
Issue number9
Publication statusPublished - 1 Jan 1995
MoE publication typeA1 Journal article-refereed


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