Straylight analysis of the BepiColombo Laser Altimeter

Details Straylight analysis of the BepiColombo Laser Altimeter Straylight analysis of the BepiColombo Laser Altimeter

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7100e..41w&link_type=abstract

Optical Design and Engineering III. Edited by Mazuray, Laurent; Wartmann, Rolf; Wood, Andrew; Tissot, Jean-Luc; Raynor, Jeffrey

Physics

Optics

Scientific paper

The BepiColombo Laser Altimeter (BELA) shall profile the surface of planet Mercury and operates on the day side as well as on the night side. Because of the high thermal loads, most interior surfaces of the front optics are highly reflective and specular, including the baffle. This puts a handicap on the straylight performance, which is needed to limit the solar background. We present the design measures used to reach an attenuation of about 10-8. We resume the method of backward straylight analysis which starts the rays at the detector and analyses the results in object space. The backward analysis can be quickly compiled and challenges computer resources rather than labor effort. This is very useful in a conceptual design phase when a design is iterated and trade-offs are to be performed. For one design, we compare the results with values obtained from a forward analysis.

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