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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)
M. Dami, GALILEO AVIONICA (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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