The NACHOS system is paving a trail for tiny pollution-monitoring spacecraft.
-based hyperspectral imaging system that can compete with traditional large-satellite instruments in chemical detection applications. Hyperspectral imaging is conceptually similar to color imaging, except that instead of each pixel containing just the three familiar red, green and blue channels that mimic human vision, each pixel contains hundreds of wavelength bands, analyzing the light in great detail in order to spot the unique spectral fingerprint of each gas of interest.
The system uses spherical mirrors that are easy to manufacture, have high optical throughput and can fit on a satellite that is roughly the size of a loaf of bread. Its high spatial resolution allows researchers to see gases not at a regional scale, but at the neighborhood scale, and could even see emissions from individual power plants from its low-Earth orbit vantage point more than 300 miles up.
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