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Perseverance’s Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) Investigation

2021; Springer Science+Business Media; Volume: 217; Issue: 4 Linguagem: Inglês

10.1007/s11214-021-00812-z

1572-9672

R. Bhartia, L. W. Beegle, Lauren DeFlores, William Abbey, Joseph Razzell Hollis, Kyle Uckert, Brian Monacelli, K. S. Edgett, M. R. Kennedy, Margarite Sylvia, D. Aldrich, M. S. Anderson, Sanford A. Asher, Zachary Bailey, Kerry Boyd, Aaron S. Burton, Michael Caffrey, Michael J. Calaway, Robert J. Calvet, Bruce Cameron, M. A. Caplinger, Brandi Carrier, Nataly Chen, Amy Chen, Matthew Clark, S. M. Clegg, P. G. Conrad, Moogega Cooper, Kristine Davis, B. L. Ehlmann, Linda Facto, M. Fries, D. H. Garrison, Denine Gasway, Ferial Ghaemi, Trevor G. Graff, K. P. Hand, Cathleen M. Harris, J D Hein, Nicholas A. Heinz, Harrison Herzog, Eric B. Hochberg, Andrew Houck, William F. Hug, Elsa Jensen, Linda C. Kah, John M. Kennedy, Robert Krylo, Johnathan Lam, Mark Lindeman, Justin McGlown, John Michel, E. Miller, Zachary Mills, M. E. Minitti, Fai Mok, James D. Moore, Kenneth H. Nealson, Anthony Nelson, Raymond Newell, Brian Nixon, Daniel Nordman, D. L. Nuding, Sonny Orellana, Michael Pauken, Glen Peterson, Randy Pollock, Heather Quinn, Claire Quinto, M. A. Ravine, R. D. Reid, Joe Riendeau, Amy Ross, Joshua Sackos, J. A. Schaffner, Mark A. Schwochert, Molly O Shelton, Rufus Simon, C. L. Smith, P. Sobrón, Kimberly Steadman, A. Steele, Dave Thiessen, Vinh Tran, Tony Tsai, Michael Tuite, Eric Tung, Rami Wehbe, Rachel L. Weinberg, Ryan H. Weiner, R. C. Wiens, Kenneth H. Williford, Chris Wollonciej, Yen-Hung Wu, R. A. Yingst, Jason Zan,

Space Science and Extraterrestrial Life

Abstract The Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) is a robotic arm-mounted instrument on NASA’s Perseverance rover. SHERLOC has two primary boresights. The Spectroscopy boresight generates spatially resolved chemical maps using fluorescence and Raman spectroscopy coupled to microscopic images (10.1 μm/pixel). The second boresight is a Wide Angle Topographic Sensor for Operations and eNgineering (WATSON); a copy of the Mars Science Laboratory (MSL) Mars Hand Lens Imager (MAHLI) that obtains color images from microscopic scales (∼13 μm/pixel) to infinity. SHERLOC Spectroscopy focuses a 40 μs pulsed deep UV neon-copper laser (248.6 nm), to a ∼100 μm spot on a target at a working distance of ∼48 mm. Fluorescence emissions from organics, and Raman scattered photons from organics and minerals, are spectrally resolved with a single diffractive grating spectrograph with a spectral range of 250 to ∼370 nm. Because the fluorescence and Raman regions are naturally separated with deep UV excitation (<250 nm), the Raman region ∼ 800 – 4000 cm −1 (250 to 273 nm) and the fluorescence region (274 to ∼370 nm) are acquired simultaneously without time gating or additional mechanisms. SHERLOC science begins by using an Autofocus Context Imager (ACI) to obtain target focus and acquire 10.1 μm/pixel greyscale images. Chemical maps of organic and mineral signatures are acquired by the orchestration of an internal scanning mirror that moves the focused laser spot across discrete points on the target surface where spectra are captured on the spectrometer detector. ACI images and chemical maps (< 100 μm/mapping pixel) will enable the first Mars in situ view of the spatial distribution and interaction between organics, minerals, and chemicals important to the assessment of potential biogenicity (containing CHNOPS). Single robotic arm placement chemical maps can cover areas up to 7x7 mm in area and, with the < 10 min acquisition time per map, larger mosaics are possible with arm movements. This microscopic view of the organic geochemistry of a target at the Perseverance field site, when combined with the other instruments, such as Mastcam-Z, PIXL, and SuperCam, will enable unprecedented analysis of geological materials for both scientific research and determination of which samples to collect and cache for Mars sample return.