| Issue |
Eur. Phys. J. Appl. Phys.
Volume 30, Number 3, June 2005
|
|
|---|---|---|
| Page(s) | 205 - 213 | |
| Section | Instrumentation and Metrology | |
| DOI | https://doi.org/10.1051/epjap:2005024 | |
| Published online | 11 March 2005 | |
https://doi.org/10.1051/epjap:2005024
Realization of photometric base unit of candela traceable to cryogenic radiometer at UME
TÜBÝTAK-Ulusal Metroloji Enstitüsü (UME), 41470, Gebze, Kocaeli, Turkey
Corresponding author: farhads@ume.tubitak.gov.tr
Received:
25
June
2004
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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