ALTA SPECTROMETER - 1 Reflectance Spectroscopy is
measuring the proportion of light that reflects off objects as a function
of the light's wavelength. Reflectance spectroscopy is one of several methods
NASA uses to try to detect Mars life from orbit. We measured the reflectance
spectra of the microbial mats we collected, both to see how the microbes
use the light, and to see how they could be detected. We used the ALTA spectrometer,
invented by Allan Treiman. Using the ALTA, we measured the proportion of
light reflected by the mats in eleven different wavelenthts of light, from
blue (470 nm) through red (700 nm) through near-infrared (980 nm). |
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The ALTA
spectrometer in use by 5th grade GT students in Texas. There are no pictures
of our group using them to take reflectance spectra of microbial mats (the
photographer was otherwise distracted). |
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