Ferhat SAMETOGLU^*

National Metrology Institute of Turkey (TÜBITAK-UME), 41470 Gebze, Kocaeli, Turkey

(Received October 12, 2005; Accepted June 18, 2006)

Traceability in illuminance measurements at the National Metrology Institute of Turkey (TÜBITAK-UME) was established in 2003 with a detector-based realization. The new measurement technique was developed for the determination of illuminance responsivity and upgrating of the illuminance scale. The unit of the illuminance responsivity, in A/lx, was measured with an expanded uncertainty of 0.2% (k=2) by supplying using the developed scanning technique for the calculation of color correction factor. The surface of a radiometer was scanned using a double-monochromator facility upgraded with an x–y scanning system. The illuminance responsivity as a function of bandpass and temperature were also investigated in this study.
To use a radiometer in the photometric applications of metrology, a light-sensitive device, a so-called trap detector, was characterized by measuring the absolute responsivity, the non-linearity, and spatial non-uniformity.

Key words: filter radiometer, cryogenic radiometer, trap detector, spectral responsivity, illuminance responsivity, monochromator, scanning

^*Corresponding author. E-mail address: ferhat.sametoglu@ume.tubitak.gov.tr