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Proceedings Paper • Open Access

Hyperspectral CMOS imager
Author(s): P. A. Jerram; M. Fryer; J. Pratlong; A. Pike; A. Walker; B. Dierickx; B. Dupont; A. Defernez

Paper Abstract

CCDs have been used for many years for Hyperspectral imaging missions and have been extremely successful. These include the Medium Resolution Imaging Spectrometer (MERIS) [1] on Envisat, the Compact High Resolution Imaging Spectrometer (CHRIS) on Proba and the Ozone Monitoring Instrument operating in the UV spectral region. ESA are also planning a number of further missions that are likely to use CCD technology (Sentinel 3, 4 and 5). However CMOS sensors have a number of advantages which means that they will probably be used for hyperspectral applications in the longer term.

There are two main advantages with CMOS sensors: First a hyperspectral image consists of spectral lines with a large difference in intensity; in a frame transfer CCD the faint spectral lines have to be transferred through the part of the imager illuminated by intense lines. This can lead to cross-talk and whilst this problem can be reduced by the use of split frame transfer and faster line rates CMOS sensors do not require a frame transfer and hence inherently will not suffer from this problem. Second, with a CMOS sensor the intense spectral lines can be read multiple times within a frame to give a significant increase in dynamic range.

We will describe the design, and initial test of a CMOS sensor for use in hyperspectral applications. This device has been designed to give as high a dynamic range as possible with minimum cross-talk. The sensor has been manufactured on high resistivity epitaxial silicon wafers and is be back-thinned and left relatively thick in order to obtain the maximum quantum efficiency across the entire spectral range

Paper Details

Date Published: 20 November 2017
PDF: 7 pages
Proc. SPIE 10565, International Conference on Space Optics — ICSO 2010, 1056501 (20 November 2017); doi: 10.1117/12.2309195
Show Author Affiliations
P. A. Jerram, e2v Technologies Ltd. (United Kingdom)
M. Fryer, e2v Technologies Ltd. (United Kingdom)
J. Pratlong, e2v Technologies Ltd. (United Kingdom)
A. Pike, e2v Technologies Ltd. (United Kingdom)
A. Walker, e2v Technologies Ltd. (United Kingdom)
B. Dierickx, Caeleste CVBA (Belgium)
B. Dupont, Caeleste CVBA (Belgium)
A. Defernez, Caeleste CVBA (Belgium)


Published in SPIE Proceedings Vol. 10565:
International Conference on Space Optics — ICSO 2010
Errico Armandillo; Bruno Cugny; Nikos Karafolas, Editor(s)

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