Issue Eur. Phys. J. Appl. Phys. Volume 32, Number 3, December 2005 Page(s) 193 - 197 Section Instrumentation and Metrology DOI 10.1051/epjap:2005092 Published online 14 December 2005

Eur. Phys. J. Appl. Phys. 32, 193-197 (2005)
DOI: 10.1051/epjap:2005092

Spatial non-uniformity analyses of radiometric detectors to identify suited transfer standards for optical radiometry

M. Durak

TÜBITAK-Uusal Metroloji Enstitüsü (UME) Gebze, 41470, Kocaeli, Turkey

murat.durak@ume.tubitak.gov.tr

(Received: 16 May 2005 / Received in final form: 13 August 2005 / Accepted: 22 August 2005 / Published online: 14 December 2005)

Abstract
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.

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