Spectralon diffuser calibration for MERIS

Carina Olij; Jos Groote Schaarsberg; Henri G.C. Werij; Erik Zoutman; Gilles Baudin; Beatrice Chommeloux; Jean-Loup Bezy; Georges Gourmelon

doi:10.1117/12.298122

31 December 1997 Spectralon diffuser calibration for MERIS

Carina Olij, Jos Groote Schaarsberg, Henri G.C. Werij, Erik Zoutman, Gilles Baudin, Beatrice Chommeloux, Jean-Loup Bezy, Georges Gourmelon

Author Affiliations +

Proceedings Volume 3221, Sensors, Systems, and Next-Generation Satellites; (1997) https://doi.org/10.1117/12.298122
Event: Aerospace Remote Sensing '97, 1997, London, United Kingdom

Abstract

One of the key payload instruments of ESA's ENVISAT polar platform is the medium resolution imaging spectrometer (MERIS), aiming at improved knowledge of our planet in the fields of bio-optical oceanography, and atmospheric and land surface processes. MERIS, which is built under responsibility of Aerospatiale, will monitor the solar irradiation scattered by the Earth by employing five cameras which simultaneously record data in 15 visible and near-infrared programmable spectral bands with very low degree of polarization sensitivity. The combined field-of-view of the five cameras spans a range of 68.5 degrees. Crucial for obtaining the desired high accuracy during a four-years lifetime, is the on- board calibration unit. This calibration unit contains a set of Spectralon diffusers, which were manufactured having in mind excellent in-flight stability as well as spectral and spatial uniformity. Preflight calibration of the Spectralon diffusers was carried out at TNO-TPD. This calibration includes the measurement of the bidirectional reflectance distribution function (BRDF) for applicable angles and wavelengths, i.e., while varying angle of incidence, angle of observation, observation area on the elongated diffusers, wavelength and polarization. The diffuser calibration was performed in a class 100 cleanroom. For these measurements the TPD calibration facility, which is described in detail, has been adapted, so that it now has five geometrical degrees of freedom. Detectors have been optimized to minimize stray light. Due to extensive commissioning of the calibration setup the absolute error (1 sigma) of these measurements amounts to less than 0.5%; relative errors are in the 0.3 - 0.4% range.

Citation Download Citation

Carina Olij, Jos Groote Schaarsberg, Henri G.C. Werij, Erik Zoutman, Gilles Baudin, Beatrice Chommeloux, Jean-Loup Bezy, and Georges Gourmelon "Spectralon diffuser calibration for MERIS", Proc. SPIE 3221, Sensors, Systems, and Next-Generation Satellites, (31 December 1997); https://doi.org/10.1117/12.298122

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available