Variable optical filters for earth-observation imaging minispectrometers

A. Piegari; J. Bulir; A. Krasilnikova; M. Dami; B. Harnisch

doi:10.1117/12.2308083

21 November 2017 Variable optical filters for earth-observation imaging minispectrometers

A. Piegari, J. Bulir, A. Krasilnikova, M. Dami, B. Harnisch

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Proceedings Volume 10567, International Conference on Space Optics — ICSO 2006; 105672Q (2017) https://doi.org/10.1117/12.2308083
Event: International Conference on Space Optics 2006, 2006, Noordwijk, Netherlands

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.

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A. Piegari, J. Bulir, A. Krasilnikova, M. Dami, and B. Harnisch "Variable optical filters for earth-observation imaging minispectrometers", Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 105672Q (21 November 2017); https://doi.org/10.1117/12.2308083

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KEYWORDS

Optical filters

Silver

Coating

Sensors

Tantalum

Charge-coupled devices

Dielectrics

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