Homogeneity analysis in a Korte--Schmidt-type integrating gold sphere.
Homogeneity measurements in a gold-coated integrating sphere at eight wavelengths in the range from 400 to 2000 nm are presented and discussed. The inner sphere wall was scanned with a mirror-based internal sphere scanner at 288 different positions. The spatially resolved measurements show the transition from poor reflectivity, associated with large inhomogeneities at 400 nm, to high reflectivity in the infrared region at 2000 nm, associated with only small deviations. From the measurements the spectrally dependent relative uncertainty of the radiance of the inner sphere wall was deduced. A spectrally dependent sphere homogeneity correction factor F(lambda) relative to a specific point within the sphere wall was also derived.
Höpe
Andreas
A
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38110 Braunschweig, Germany. andreas.hoepe@ptb.de