Physics – Optics
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5897..148b&link_type=abstract
Photonics for Space Environments X. Edited by Taylor, Edward W. Proceedings of the SPIE, Volume 5897, pp. 148-155 (2005).
Physics
Optics
Scientific paper
We present a calibration unit to be used in near and medium infrared instrumentation. The system belongs to the 'black-body' (BB) and 'integrating-sphere' (IS) category and has been developed during the phase-A study as part of the Medium Infrared Instrument (MIRI) to be inserted on the NASA-ESA mission James Webb Space Telescope (JWST). A voltage driven resistance temperature device (RTD) is used as active thermal light source with spectral energy distribution determined by the working temperature and material characteristics, while the integrating sphere is used in order to create a Lambertian beam of calibration light. The system would provide light both for flat-fielding calibration and, in a further development, for wavelength calibration making use of the same illumination optics. We will describe the experimental setup and the properties requested by the device. A complete analytical simulation guiding the dimensioning of the emitter and IS is given with the results from several laboratory test made in order to qualify the system in realistic operating conditions.
Bonoli Carlotta
Bortoletto Favio
D'Alessandro Maurizio
Magrin Demetrio
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