By George P. Eppeldauer

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Extra resources for Optical Radiation Measurements Based on Detector Standards

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4 % smaller than the geometrically measured area because of the larger spatial nonuniformity. It follows from Figs. 3 and 4a that the optimum cosine response depends on the wavelength. Consequently, the input geometry has to be optimized for the wavelength (or the spectral distribution) of the source to be measured. 4. RESPONSIVITY CALIBRATION AND SPATIAL CHARACTERISTICS An x-y scanning procedure was used to determine the integrated irradiance responsivity and the effective aperture area of irradiance and illuminance meters6.

Brown, G. P. Eppeldauer, and K. R. Lykke, “Facility for Spectral Irradiance and Radiance Responsivity Calibrations using Uniform Sources,” Applied Optics, Vol. 45, No. 32, p. 8218-8237, 2006. 3. K. D. Stock, R. Heine, and H. Hofer, “Spectral characterization of Ge trap detectors and photodiodes used as transfer standards,” Metrologia, Vol. 40, p. S163–S166, 2003. 4. M. Lopez, H. Hofer and S. Kuck, “High accuracy measurement of the absolute spectral responsivity of Ge and InGaAs trap detectors by direct calibration against an electrically 32 calibrated cryogenic radiometer in the near- infrared,” Metrologia, Vol.

The resultant shunt resistance was 33 MΩ for four non-selected photodiodes (set-1) and 50 MΩ for four photodiodes selected for equal shunt resistance of 200 MΩ (set-2). The expanded uncertainty of the shunt resistance measurements was 10 % (k=2). The feedback resistance of the current-to-voltage converter during the spectral measurements was 100 MΩ. 5 pW/Hz1/2 for run-2 using set-1 with the 33 MΩ shunt resistance. Since the resultant shunt resistance of the Ge trap detector is only 1 kΩ, its dominating noise is 1/f noise.

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Optical Radiation Measurements Based on Detector Standards by George P. Eppeldauer

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