16 May 2012 Time-resolved remote Raman and fluorescence spectrometers for planetary exploration
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Abstract
At the University of Hawaii, we have developed compact time-resolved (TR) Raman, and fluorescence spectrometers suitable for planetary exploration under NASA's Mars Instrument Development Program. The compact Raman and fluorescence spectrometers consist of custom miniature spectrographs based on volume holographic gratings, and custom miniature intensified CCD cameras. These spectrographs have been interfaced with a regular 50 mm camera lens as well as with a three and a half inch diameter telescope for remotely interrogating minerals, water, water-ice and dry ice. Using a small frequency-doubled Nd:YAG pulsed laser (35 mJ/pulse, 20 Hz) and 50 mm camera lens, TRRaman and LINF spectra of minerals, and bio-minerals can be measured within 30 s under super-critical CO2, and with 3.5-inch telescope these samples can be interrogated to 50 m radial distance during day time and nighttime. The fluorescence spectrograph is capable of measuring TR- laser-induced fluorescence excited with 355 nm laser in the spectral range 400-800 nm spectral range. The TR-fluorescence spectra allow measurement of LINF from rare-earths and transition-metal ions in time domain, and also assist in differentiating between abiogenic minerals from organic and biogenic materials based on the fluorescence lifetime. Biological materials are also identified from their characteristic short-lived (<10 ns) laser-induced fluorescence lifetime. These instruments will play important role in planetary exploration especially in NASA's future Mars Sample Return Mission, and lander and rover missions.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shiv K. Sharma, Anupam K. Misra, Tayro E. Acosta, and Paul G. Lucey "Time-resolved remote Raman and fluorescence spectrometers for planetary exploration", Proc. SPIE 8379, Laser Radar Technology and Applications XVII, 83790J (16 May 2012); doi: 10.1117/12.920955; https://doi.org/10.1117/12.920955
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