Multispectral (MSI) and hyperspectral (HSI) imaging spectrometers have become essential tools for various applications from agricultural to defense. It is imperative to assess the performance of multi-spectral performance in relevant environmental locations. However, these techniques can be time consuming, expensive, and often a difficult process to assess the spectral properties in the relevant environments and terrains. Therefore, an alternate test methodology will be explored, such as, the utilization of laboratory analysis for predictive means. The method will not replace the need for actual testing, but can reduce the need for such testing. The methodology will utilize a fully spectrally characterized environment and terrain, which will be compared to laboratory measurements across the full spectrum. The correlated results will be described and the effectiveness of the methodology will be assessed.
Black coatings are used in infrared instruments for the suppression of stray and scattered photons. We previously reported on a diamond-like carbon (DLC) coating that exhibited extremely low outgassing for high vacuum applications1. The nature of the plasma deposition process limits the shapes that can be coated to flat plates or openended tubes. Additionally, the IR reflectivity, though low, is highly specular, which can be problematical in certain situations. We have since examined a number of other surface treatments including paints and electrodeposited coatings using a hemispherical directional reflectometer. Specular and diffuse reflectance is reported as functions of wavelength and incidence angle. Some vacuum considerations will be discussed. We show the application of black coatings to the design of a light trap/air vent.
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