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The view from outside often provides unique insights into an environment as it can be extraordinarily difficult to objectively observe a system from within.\u00a0 Once the ability to \u201cslip the surly bonds of earth\u201d was established in the 1960\u2019s it quickly became a race to exploit the ability to observe our earth from above by deploying satellites with capabilities for earth observation (EO). From the first space-based multispectral imager (MSI), Landsat-1, launched by NASA in 1972 to the current proliferation of constellations of commercial cubesats, EO systems rely on the ability to differentiate the optical signal of interest from the noise, often employing wavelength selective optical filters for this purpose.<\/p>\n
By their nature optical filters provide wavelength selectivity to the instruments in which they are employed.\u00a0 In EO systems, single selective wavelength bands are often necessary to allow observation of unique spectral characteristics representative of specific phenomena of interest exploiting\u00a0 unique wavelength bands that are reflected, transmitted, or absorbed from different atmospheric and terrestrial constituents with different chemical compositions.<\/p>\n
Optical filters provide can provide wavelength selectivity to these systems either as single band-pass filters (BPF) to interrogate one wavelength region of interest or as multi-zone filter (MZF) arrays that can turn a single detector into a multi-spectral device capable of analyzing different wavelengths and the associated phenomena of interest.<\/p>\n
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