Optimization of Schottky-barrier infrared detectors for solar blindness

Ralph R. Reinhold

doi:10.1117/12.21762

1 October 1990 Optimization of Schottky-barrier infrared detectors for solar blindness

Ralph R. Reinhold

Author Affiliations +

Proceedings Volume 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing; (1990) https://doi.org/10.1117/12.21762
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

The solar spectral response of a Schottky-barrier infrared detector (PtSi) is compared to a photovoltaic detector (InSb) of comparable average over the region of interest. The effect of sunlight on a Schottky-barrier detector is found to be even more pronounced than that of a photovoltaic detector of equivalent sensitivity. To reduce this exaggerated effect, a spectral model has been developed for the selection of the optimum filter for use on a PtSi focal-plane array. The model makes it possible to reduce the effect of solar irradiance while not significantly impacting the performance of the detector against a thermal target. The spectral ratio of solar irradiance to a 290-K target for a Schottky-barrier detector is discussed. The solar-to-target contrast ratio is plotted against the integrated 3-5-micron spectral sensitivity to help the user select an optimum cut-off wavelength.

Citation Download Citation

Ralph R. Reinhold "Optimization of Schottky-barrier infrared detectors for solar blindness", Proc. SPIE 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing, (1 October 1990); https://doi.org/10.1117/12.21762

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