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An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite

Rolt, Stephen; Calcines, Ariadna; Lomanowski, Bartosz; Bramall, David; Shaw, Benjamin

An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite Thumbnail


Authors

Stephen Rolt

Bartosz Lomanowski



Contributors

Ramón Navarro
Editor

James H. Burge
Editor

Abstract

We describe here an optical polariser module intended to deliver well characterised polarised light to an imaging spectrometer instrument. The instrument in question is the Sentinel-4/UVN Earth observation imaging spectrometer due to be deployed in 2019 in a geostationary orbit. The polariser module described here will be used in the ground based calibration campaign for this instrument. One critical task of the calibration campaign will be the highly accurate characterisation of the polarisation sensitivity of instrument. The polariser module provides a constant, uniform source of linearly polarised light whose direction can be adjusted without changing the output level or uniformity of the illumination. A critical requirement of the polariser module is that the illumination is uniform across the exit pupil. Unfortunately, a conventional Glan-Taylor arrangement cannot provide this uniformity due to the strong variation in transmission at a refractive surface for angles close to the critical angle. Therefore a modified prism arrangement is proposed and this is described in detail. Detailed tolerance modelling and straylight modelling is also reported here.

Citation

Rolt, S., Calcines, A., Lomanowski, B., Bramall, D., & Shaw, B. (2016). An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite. In R. Navarro, & J. H. Burge (Eds.), . https://doi.org/10.1117/12.2232358

Conference Name Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II: SPIE Astronomical Telescopes + Instrumentation, 2016
Conference Location Edinburgh
Online Publication Date Jul 1, 2016
Publication Date 2016
Deposit Date Sep 25, 2018
Publicly Available Date Jan 18, 2023
Volume 9912
Series ISSN 0277-786X
DOI https://doi.org/10.1117/12.2232358
Public URL https://durham-repository.worktribe.com/output/1144058

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