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Proceedings Paper • Open Access

Stray light solution for GHGSAT nanosatellite
Author(s): Vincent Latendresse; Dina Katsir; Keren Shabtai; Jason McKeever; Victor Isbrucker; Jonathan Lavoie; Roman V. Kruzelecky; Wes Jamroz

Paper Abstract

GHGSat is world’s first nanosatellite dedicated for monitoring greenhouse gas (GHG) and air quality gas (AQG) emissions from any industrial site in the world. The satellite was designed and constructed by MPB Communications to monitor carbon dioxide (CO2) and methane (CH4) from a low earth orbit (about 500 km). To reach the designated resolution of less than 50 meters and high precision of greenhouse gases monitoring, the nanosatellite has large aperture in order to collect enough optical signal. The aperture of about 10cm causes significant stray light issues with limited solution options without adding too much weight to the light weight satellite. As the stray light was the main concern in this project, many precautions was taken. As a solution for blocking unwanted light, baffle with many vanes was used. However, having the vanes is not optimal solution without high absorbing coating applied on it. The coating requirements was low reflectance, no outgassing in space environment and long life stability, being a satellite inaccessible for maintenance. The chosen coating for stray light elimination was Acktar Vacuum BlackTM. Hemispherical reflectance and BRDF data was examined before making the choice. The satellite was launched in June 2016 and the images was analyzed to ensure the aimed resolution and precision of the optical system. After almost two years of activity, no visible changes was discovered in image quality nor stray light issues detected.

Paper Details

Date Published: 12 July 2019
PDF: 8 pages
Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111807W (12 July 2019); doi: 10.1117/12.2536203
Show Author Affiliations
Vincent Latendresse, MPB communications Inc. (Canada)
Dina Katsir, Acktar Ltd. (Israel)
Keren Shabtai, Acktar Ltd. (Israel)
Jason McKeever, GHGSat Inc. (Canada)
Victor Isbrucker, Isbrucker Consulting Inc. (Canada)
Jonathan Lavoie, MPB Communications Inc. (Canada)
Roman V. Kruzelecky, MPB Communications Inc. (Canada)
Wes Jamroz, MPB Communications Inc. (Canada)

Published in SPIE Proceedings Vol. 11180:
International Conference on Space Optics — ICSO 2018
Zoran Sodnik; Nikos Karafolas; Bruno Cugny, Editor(s)

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