https://doi.org/10.1051/epjap:2005092
Spatial non-uniformity analyses of radiometric detectors to identify suited transfer standards for optical radiometry
TÜBİTAK-Uusal Metroloji Enstitüsü (UME) Gebze, 41470, Kocaeli, Turkey
Corresponding author: murat.durak@ume.tubitak.gov.tr
Received:
16
May
2005
Revised:
13
August
2005
Accepted:
22
August
2005
Published online:
14
December
2005
The non-uniformity of responsivity of photodiodes and thermal detectors limits the accuracy of their calibration. Spatial non-uniformity properties of a pyroelectric radiometer, a thermopile detector, silicon, germanium and indium gallium arsenide photodiodes are investigated in the scope of our work. Silicon type photodiodes showed best uniformity characteristics among the analysed photodiodes and detectors. Significant changes have been found in the spatial responsivity close to the band gap of silicon. The spatial responsivity of thermopile detector was measured at two different wavelengths and no wavelength dependence was observed.
PACS: 78.20.-e – Optical properties of bulk materials and thin films / 42.62.Eh – Metrological applications; optical frequency synthesizers for precision spectroscopy / 78.40.Fy – Semiconductors
© EDP Sciences, 2005
