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Proceedings Paper

Solar blind bandpass filters for UV imaging devices
Author(s): Malka Brith Lindner; Shimon Elstein; Joseph Wallace; Pinhas Lindner
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Paper Abstract

A solar blind UV bandpass filter technology has been developed which is appropriate for use with all types of UV imaging devices under full daylight conditions. This technology is based on dye doped polymer films that provide the critical solar UV blocking and the required sharp rejection slope,due to their intense absorption bands in specific portions of the UV. These films are combined with other components that block visible and near IR light to form selective and very efficient sun blocking UV bandpass filters. This technology is very flexible and permits tailoring of the filter transmission and its blocking characteristics. Solar blind bandpass filters based on this technology have been produced for use with MCP imagers with CsTe and RbTe photocathodes. Filter characteristics include 10-25 percent peak transmission, bandwidths of 16-22 nm and out of band blocking levels in excess of 12 OD. Using these filters, under direct midday summer sun, background signal levels less than 10 photons per second were obtained, when integrate dover the entire field of view of the imager. Under development is a filter for use with back illuminated CCDs. Target specifications include 15 percent peak transmission, 20 nm bandwidth and substantial blocking of solar radiation from 290 to 1100 nm. Feasibility for CCD imaging in the solar blind range was proven with a BCCD camera.

Paper Details

Date Published: 1 April 1998
PDF: 8 pages
Proc. SPIE 3302, Digital Solid State Cameras: Designs and Applications, (1 April 1998); doi: 10.1117/12.304582
Show Author Affiliations
Malka Brith Lindner, OFIL Ltd. (Israel)
Shimon Elstein, OFIL Ltd. (Israel)
Joseph Wallace, OFIL Ltd. (Israel)
Pinhas Lindner, Agricultural Research Organization (Israel)

Published in SPIE Proceedings Vol. 3302:
Digital Solid State Cameras: Designs and Applications
George M. Williams Jr., Editor(s)

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