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A measurement campaign was carried out to document system and source dependent effects on radiant intensity data measured in the European Goniometric Facility (EGO) at the Space Applications Institute (SAI). Experiments were designed to document the stability of the light sources, the symmetry of the EGO and a repeatedly observed step in the radiant intensity data. A series of experiments was performed to characterize the stability of a halogen collimated lamp and a HeNe laser used as the illumination sources in the EGO. Results showed a time drift in the intensity of the output from both the lamp and the laser source. An experiment designed to investigate the symmetry of the left and the right hemisphere of the laboratory revealed a left-right asymmetry in the footprint of the collimated source. A test conducted to characterize a repeatedly observed step in the radiant intensity data for low detector elevation angles indicated that the spectrometer used had a slightly different response when it was inverted than when it was the right way up. This difference might be due to a slight misalignment in the detector optics. Experimental results are presented and discussed in this document.

Additional information

Authors: SOLHEIM I, NORUT-IT, Tromsø (NO);HOSGOOD B, JRC Ispra (IT);ANDREOLI G, JRC Ispra (IT);PIIRONEN J, University of Helsinki (FI)
Bibliographic Reference: EUR 17268 EN (1996) 38pp., FS, free of charge
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT), Fax: +39-332-785818
Record Number: 199710122 / Last updated on: 1997-04-01
Original language: en
Available languages: en