Standoff ultra-compact μ-Raman sensor for planetary surface explorations

摘要

We report the development of an innovative Standoff Ultra-Compact micro-Raman (SUCR) instrument that would solve some of the limitations of traditional micro-Raman systems to provide a superior instrument for future NASA missions. This active remote sensor system, based on a 532 nm laser and a miniature spectrometer, is capable of inspection and identification of minerals, organics, and biogenic materials within several centimeters (2 to 20 cm) at a high 10 micrometer resolution. The sensor system is based on inelastic (Raman) light scattering and Laser-Induced Fluorescence (LIF). We report on micro-Raman spectroscopy development and demonstration of the standoff Raman measurements by acquiring Raman spectra in daylight at a 10 cm target distance with a small line-shaped laser spot size of 17.3 micrometer (width) by 5 millimeter (height).