An micro-bandpasss (6.3-7.6μm) Filter for the multichannel scanning radiometer

Document Type

Article

Publication Date

4-1-2002

Abstract

Optical coatings are designed and produced for the multichannel scanning radiometer meteorological space instrument operating in the spectral range 6.3-7.6μm. First the choice of substrates and layers materials is discussed. Then the substrate temperature dependent effects of three different Te-enriched PbTe single layers on the dispersion and absorption characteristics and carrier concentration are studied. The experimental results demonstrate that the performance of the coating made using PbTe + 0.3 at. % Te material is better than that of the others. Finally, details of the spectral design and manufacture of such a filter which meets the demanding bandwidth and transparency requirements of the application are presented. This design model is based on the optical and semiconductor properties of a multilayer filter containing PbTe layer material in combination with the dielectric dispersion of ZnSe deposited on the a Ge substrate. Comparisons between the computed spectral performance of the model and spectral measurements from manufactured coatings over a wavelength range of 6.3-7.6μm are presented.

Publication Source (Journal or Book title)

International Journal of Infrared and Millimeter Waves

First Page

535

Last Page

544

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