Planetary exploration enabled by a compact adaptable, time-resolved, spatial-heterodyne Raman spectrometer

Dina M. Bower; Steven X. Li; Shahid Aslam; Tilak Hewagama; Nicolas Gorius

doi:10.1117/12.2618777

3 June 2022 Planetary exploration enabled by a compact adaptable, time-resolved, spatial-heterodyne Raman spectrometer

Dina M. Bower, Steven X. Li, Shahid Aslam, Tilak Hewagama, Nicolas Gorius

Proceedings Volume 12121, Sensors and Systems for Space Applications XV; 121210N (2022) https://doi.org/10.1117/12.2618777
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

Planetary science exploration is transitioning from a focus on remote sensing techniques to in situ instruments for landed missions, and Raman spectrometers are quickly gaining ground as essential to these payloads. To accurately identify targets of interest to planetary science, the Raman spectrometer spectral resolution is required to be better than 0.19 nm. While dispersive spectrometers are a direct way to separate optical radiation into its constituent irradiance spectrum, they have major disadvantage of very inefficient light throughput for high resolution applications because they require very small entrances slits, ~50 μm. This is a major drawback for a stand-off system where target sample illumination size is large and return signals are very weak. Fluorescence is typically brighter than the Raman signal, and in conventional Raman spectroscopy, a slow detector integrates both signals and obscures the Raman signature. To mitigate this, we are developing an ultra-compact, high resolution, high throughput, time-resolved VIS-NIR Raman spatial heterodyne spectrometer (SHS). The SHS replaces the modulation mirror in a high resolution and throughput of a traditional Fourier Transform Spectrometer (FTS) with a stationary grating. The SHS has the same advantage of the FTS, which has two orders of magnitude larger acceptance angle than dispersive spectrometers without sacrificing resolution. In this work we focus on applications to stand-off Raman SHS spectroscopy for the detection of biomarkers and characterization of habitability on planetary surfaces.

Citation Download Citation

Dina M. Bower, Steven X. Li, Shahid Aslam, Tilak Hewagama, and Nicolas Gorius "Planetary exploration enabled by a compact adaptable, time-resolved, spatial-heterodyne Raman spectrometer", Proc. SPIE 12121, Sensors and Systems for Space Applications XV, 121210N (3 June 2022); https://doi.org/10.1117/12.2618777

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KEYWORDS

Raman spectroscopy

Spectroscopy

Heterodyning

Fourier transforms

Signal detection

Planetary science

Remote sensing

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