Quantcast
Industry Cortex

Document Brief

Poster # 8 ...

Advanced Instrumentation for Hyperspectral Remote Sensing!...

Hyperspectral imagers identify materials and gases for a wide range of applications, from mapping minerals to finding an illegal drug lab. Our new approach uses arrays of millions of tiny mirrors to make hyperspectral imaging several hundred times faster.!...

Steven Love (PI), T. Hale, P. Chylek ...

What is the challenge ...

Imagine a camera that takes pictures showing not just the size and shape of objects, but what they re made of as well. Some of these things, like gases in the air, that are completely invisible to the human eye. Such cameras are called hyperspectral imagers. Hyperspectral imaging (HSI) sorts light into hundreds of bins according to wavelength. Your eye perceives different wavelengths as colors, but a human eye (or a color camera) divides light into just three rather fat wavelength bins -- red, green, and blue. Much more information can be gained by dividing the light into many more, much narrower bins, and including wavelengths invisible to the eye. In a hyperspectral image, each pixel contains a detailed map of brightness versus wavelength, a spectrum. HSI can identify materials and gases because every molecule vibrates, and spins, at unique sets of frequencies, and absorbs light (or emits light, if it s hot) at the corresponding wavelengths. These patterns are as unique as fingerprints....

What have we learned so far ...

Our first prototype MMA-based programmable hyperspectral imager successfully demonstrated the basic concept It produces hyperspectral images (right), and can image particular chemicals by programming the relevant wavelengths the MMA. It had one major drawback, however Light from different parts of the scene strike the grating at different angles, and therefore the dispersed wavelengths leave the grating at different angles for different parts of the image. This means a set of wavelengths, programmed for a particular chemical in one part of the scene, ended up being the wrong color for other parts of the scene. You could only image one narrow stripe of the scene at a time, then shift the pattern on the MMA and image the next stripe, etc. If we were to select a single wavelength band, then image an object all at once, without stripe-by-stripe shifting, the resulting image on a color camera would look something like this ...

Simulated color image of a light bulb from the original MMA HSI prototype, showing how a narro...

Document Keywords

#8 Hyperspectral Satellite Instrument for Environmental Treaty Verification and Spectral Imagers Based on Micro - Mirror Arrays - Steve Love science ldrd ldrd day 2011 posters love

Sponsored Products

About LOS ALAMOS NATIONAL SECURITY, LLC

Discover science and technology at Los Alamos National Lab, where challenges are solved for the environment, medicine, space, national security and technology.

Contact

5056062276

sponsored links