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Proceedings Paper • Open Access

Variable optical filters for earth-observation imaging minispectrometers
Author(s): A. Piegari; J. Bulir; A. Krasilnikova; M. Dami; B. Harnisch

Paper Abstract

Small-dimension, low-mass spectrometers are useful for both Earth observation and planetary missions. A very compact multi-spectral mini-spectrometer that contains no moving parts, can be constructed combining a graded-thickness filter, having a spatially variable narrow-band transmission, to a CCD array detector. The peak wavelength of the transmission filter is moving along one direction of the filter surface, such that each line of a two-dimensional array detector, equipped with this filter, will detect radiation in a different pass band. The spectrum of interest for image spectrometry of the Earth surface is very wide, 400-1000nm. This requirement along with the need of a very small dimension, makes this filter very difficult to manufacture. Preliminary results on metal-dielectric wedge filters, with a gradient of the transmission peak wavelength equal to 60nm/mm, are reported.

Paper Details

Date Published: 21 November 2017
PDF: 7 pages
Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 105672Q (21 November 2017); doi: 10.1117/12.2308083
Show Author Affiliations
A. Piegari, ENEA Optical Coatings Group (Italy)
J. Bulir, ENEA Optical Coatings Group (Italy)
A. Krasilnikova, ENEA Optical Coatings Group (Italy)
B. Harnisch, ESA-ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 10567:
International Conference on Space Optics — ICSO 2006
Errico Armandillo; Josiane Costeraste; Nikos Karafolas, Editor(s)

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