Perseverance and SHERLOC's Calibration Target

At left is NASA's Perseverance Mars rover. The annotation shows where spacesuit materials can be found attached to a calibration target for SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals), one of the rover's instruments. At right is a close-up of the calibration target. Scientists rely on calibration targets to fine-tune instrument settings using materials with known properties. In the case of SHERLOC's calibration target, they are also studying how the five swatches of spacesuit materials arranged along the bottom row degrade in the Martian environment. Those materials, from left to right: a piece of polycarbonate visor used in spacesuit helmets; Vectran, a cut-resistant material used for the palms of astronaut gloves; a commonly used spacesuit material called Ortho-Fabric; and two kinds of Teflon, which has dust-repelling nonstick properties. Top row, left to right: two gallium nitride targets that glow different colors when illuminated with SHERLOC's laser; a slice of Martian meteorite named Sayh al Uhaymir 008 (SaH 008); a maze designed to focus SHERLOC's camera; and a diffuse transmission target that measures how SHERLOC's laser scatters light. This image was taken by the WATSON (Wide Angle Topographic Sensor for Operations and eNgineering) camera, which is part of SHERLOC on the end of Perseverance's robotic arm. A key objective for Perseverance's mission on Mars is astrobiology, including the search for signs of ancient microbial life. The rover will characterize the planet's geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith. NASA's Mars Sample Return Program, in cooperation with ESA (European Space Agency), is designed to send spacecraft to Mars to collect these sealed samples from the surface and return them to Earth for in-depth analysis. The Mars 2020 Perseverance mission is part of NASA's Mars Exploration Program (MEP) portfolio and the agency's Moon to Mars exploration approach, which includes Artemis missions to the Moon that will help prepare for human exploration of the Red Planet. https://photojournal.jpl.nasa.gov/catalog/PIA26520