BRDF; BSDF; BTDF; Bidirectional scattering distribution function; calibration; diffuser; measurement; enhancement; laser tracker; Sentinel-4; ESA
Abstract :
[en] In the field of earth-observation, on-board calibration is often necessary to guarantee the radiometric accuracy of space instruments. A typical method is to use large diffusers in front of the instrument, illuminated with a reference source like the sun [1]. Hence, it is necessary to characterize the scattering properties of the diffuser with excellent accuracy. Given the large size and weight of the diffusers to characterize, CSL have developed a bench which uses a robot arm to manipulate the sample. For the most stringent applications, the typical accuracy of robotic arms is not good enough to measure the BSDF with a satisfactory accuracy. A method have been developed which uses laser tracker measurements of the sample during a calibration phase and compensate for the robot errors. This paper describes the principle of the method and the results obtained. We also present the model of how the orientation error of the sample affects the BSDF relative error.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Researc
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Clermont, Lionel ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Michel, Céline ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Mazy, Emmanuel ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Language :
English
Title :
Performance enhancement of a BSDF test bench using an algorithm fed with laser-tracker measurements
Publication date :
21 June 2019
Event name :
SPIE Optical Metrology, 2019, Munich, Germany
Event organizer :
SPIE
Event place :
Munich, Germany
Event date :
June 2018
Audience :
International
Journal title :
Proceedings of SPIE: The International Society for Optical Engineering
ISSN :
0277-786X
eISSN :
1996-756X
Publisher :
International Society for Optical Engineering, Bellingham, United States - Washington
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Bibliography
L. Clermont et al., "Design and tests of the sun baffle for the Sentinel-4 UVN embedded calibration assembly", Proc. SPIE 10562, International Conference on Space Optics-ICSO 2016, 1056201 (25 September 2017)
J. Stover, "Optical Scattering: Measurement and Analysis", SPIE press book (2012)
E.C Fest, "Stray-light analysis and control", SPIE press
J.Y. Plesseria et al., "Development of a BRDF measurement bench for characterisation of diffuse reflective materials", Proc. 12th European Conference on Space Structures, Materials & Environmental testing", 2012
E. Mazy et al., "Recent development in BTDF/BRDF metrology on large-scale lambertian-like diffusers, application to on-board calibration units in space instruments", Proc. SPIE 11056-48 (2019)
P. A Lightsey, "Systems Engineering for Astronomical Telescopes", SPIE press book (2018)
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