1 April 1998 Solar-blind bandpass filters for UV imaging devices
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Malka Brith Lindner, Malka Brith Lindner, Shimon Elstein, Shimon Elstein, Joseph Wallace, Joseph Wallace, Pinhas Lindner, Pinhas Lindner, } "Solar-blind bandpass filters for UV imaging devices", Proc. SPIE 3302, Digital Solid State Cameras: Designs and Applications, (1 April 1998); doi: 10.1117/12.304582; https://doi.org/10.1117/12.304582
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