Eur. Phys. J. Appl. Phys.
Volume 30, Number 3, June 2005
|Page(s)||205 - 213|
|Section||Instrumentation and Metrology|
|Published online||11 March 2005|
Realization of photometric base unit of candela traceable to cryogenic radiometer at UME
TÜBÝTAK-Ulusal Metroloji Enstitüsü (UME), 41470, Gebze, Kocaeli, Turkey
Corresponding author: email@example.com
Revised: 19 October 2004
Accepted: 21 December 2004
Published online: 11 March 2005
At National Metrology Institute of Turkey (UME, Ulusal Metroloji Enstitüsü), luminous intensity unit of candela was realized using detector-based approach and photometric scale was re-established depending on this new realization. Candela was measured on photometric bench using interferometric distance measurement system and filter-radiometer traceable to UME primary level electrical-substitution cryogenic radiometer. Thermally stabilized filter radiometer, which has been designed for spectral irradiance measurements, is consists of trap detector, filter housing and precision aperture. Different measurement techniques were used to fully characterize each parameter of filter-radiometer; like effective aperture area, spectral transmittance of filter and responsivity of trap detector.
PACS: 42.72.-g – Optical sources and standards / 07.60.Dq – Photometers, radiometers, and colorimeters / 06.20.-f – Metrology
© EDP Sciences, 2005
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