03.21.2017 Break in Raised Tread on Curiosity Wheel
02.27.2017 Swirling Dust in Gale Crater, Mars, Sol 1613
02.27.2017 Dust Devil Passes Near Martian Sand Dune
02.27.2017 Sand Moving Under Curiosity, One Day to Next
12.13.2016 Now and Long Ago at Gale Crater, Mars
12.13.2016 Where's Boron? Mars Rover Detects It
10.03.2016 Curiosity Self-Portrait at 'Murray Buttes'
10.03.2016 Butte 'M9a' in 'Murray Buttes' on Mars
09.19.2016 Ribbon Cutting
09.09.2016 Farewell to Murray Buttes (Image 5)
09.09.2016 Farewell to Murray Buttes (Image 4)
09.09.2016 Farewell to Murray Buttes (Image 3)
09.09.2016 Farewell to Murray Buttes (Image 2)
09.09.2016 Farewell to Murray Buttes (Image 1)
08.26.2016 Out-of-this-World Records
03.30.2016 Erisa Hines
03.30.2016 Buzz Aldrin
02.12.2016 Women in Science
02.09.2016 Adam Steltzner, a JPL engineer
01.27.2016 Night Close-up of Martian Sand Grains
01.27.2016 Curiosity Self-Portrait at Martian Sand Dune
12.17.2015 Alteration Effects at Gale and Gusev Craters
12.17.2015 Full-Circle View Near 'Marias Pass' on Mars
12.11.2015 Surface Close-up of a Martian Sand Dune
12.11.2015 Martian Sand Disturbed by Rover Wheel
Sample Analysis at Mars Instrument, Side Panels Off (Annotated)An instrument suite that will analyze the chemical ingredients in samples of Martian atmosphere, rocks and soil during the mission of NASA's Mars rover Curiosity, is shown here during assembly at NASA Goddard Space Flight Center, Greenbelt, Md., in 2010.
The Sample Analysis at Mars, or SAM, is about the size of a microwave oven. This image was taken before installation of its side panels and before environmental testing. The suite's three instruments are visible: the tunable laser spectrometer (TLS) at lower left, quadrupole mass spectrometer (QMS) at upper right, and gas chromatograph (GC) at lower right.
SAM's solid sample inlet tubes (SSIT), visible at top right, are the routes by which Curiosity's robotic arm will deliver samples of soil and powdered rock for analysis. Other major components of SAM include the sample manipulation system and the gas processing system. The gas processing system uses transfer lines, heaters, temperature sensors and turbomolecular pumps.
The tunable laser spectrometer uses absorption of light at specific wavelengths to measure concentrations of selected chemicals, such as methane, carbon dioxide and water vapor. It also identifies the proportions of different isotopes in those gases. Isotopes are variants of the same element with different atomic weights, and their ratios can provide clues about the planet's history.
The quadrupole mass spectrometer identifies gases by the molecular weight and electrical charge of their ionized states. It will check for several elements important for life as we know it, including carbon, nitrogen, sulfur and oxygen contained in volatile molecules.
The gas chromotograph separates different gases from a mixture to aid identification. It has its own detector but also feeds the separated fractions to the quadrupole mass spectrometer and the tunable laser spectrometer for more detailed analysis.
Image Credit: NASA/JPL-Caltech