Remote Raman Analysis
Raman spectroscopy is typically envisioned as an in situ analysis technique as it requires a strong monochromatic exciting source (now invariably a laser), and highly efficient spectral measurement apparatus. However, Raman analysis of minerals can be performed at ranges of tens of meters using low-power lasers similar to those which have already flown on planetary missions, using modest receiver diameters (10 cm) and modern efficient spectral measurement hardware.
Under the direction of Dr. Shiv Sharma of the University of Hawaii, Dr. Lucey is also participating in the development of a system to allow Raman spectroscopy at range of 10's of meters. This NASA-funded project is aimed at Mars landers or landers on other planets, but also has terrestrial uses.
This capability enables rapid and model-independent mineralogical analysis of rocks and soils in the vicinity of a lander or a large rover. This capability does not replace passive remote spectral analysis which can survey much larger areas in less time, but does offer an entirely new ability to make less ambiguous mineralogical identification.
We have measured Raman spectra of dozens of rocks and minerals from distances ranging up to 10 meters. Our current emphasis is to calibrate the strength of the Raman emission lines relative to input laser power and wavelength. This information is critical to predicting system performance on another planet.
HIGP LIDAR (Light Detection and Ranging) Group
Remote Raman Spectroscopy