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Space Acceleration Measurements System II (SAMS-II)

SAMS-II is a distributed system of sensors, currently on board the ISS, SAMS-II has two sensors located in the USLab, two sensors in the JEM,  one sensor in the COF, one sensor attached to the CIR, and one sensor in the MSG facility.

SAMS-II Status

September 29, 2010 – SAMS measured the microgravity environment for the NASA Glenn Research materials science experiment Coarsening in Solid Liquid Mixures-2 Reflight(CSLM-2R) during operations within the Microgravity Science Glovebox (MSG). The CSLM-2R experiment operated during Increment 23/24 and the SAMS sensor Triaxial Sensor Head-Ethernet Standalone (TSH-ES) located in MSG provided acceleration data to the Principal Investigator.


SAMS-II measures vibrations and transient acceleration disturbances resulting from ISS vehicle activities, ISS systems operations, experiment operations, crew movements, and ISS structure thermal expansion and contraction. SAMS Remote Triaxial Sensor (RTS) systems are used to monitor on-board ISS accelerations for individual experiments requiring direct acceleration measurement support. Each RTS is capable of measuring acceleration disturbances between 0.01 Hz and 400 Hz.  This aggregate set of acceleration disturbances is commonly referred to g-jitter. Each RTSs consist of two components: the RTS sensor enclosure (SE) and the RTS electronics enclosure (EE). The RTS-SE, placed as close to the experiment as possible, translates the g-jitter into a digital signal. The RTS-EEs provides power and command signals for up to 2 RTS-SEs and receives the g-jitter data from the RTS-SEs.

An additional sensor called the RTS Ethernet Standalone (RTS-ES) is available for acceleration measurement support.  The RTS-ES is just that, a sensor capable of making acceleration measurements in a standalone fashion; the RTS-ES does not require an RTS-EE to function.
All SAMS RTSs are linked together by the Interim Control Unit (ICU), which coordinates the command and telemetry data for the various RTS systems being used throughout the Station.  All acceleration data obtained by each SAMS RTS are routed to the ICU for downlink to the ground.  All command and control for each RTS is accomplished through the ICU. The main component of the ICU is a laptop computer. Once the ICU receives the measurements from the RTS systems, it checks the data for completeness, breaks the data into well-defined information packets, and sends the packets to the SAMS Ground Operations Equipment located at the Telescience Support Center (TSC) at Glenn Research Center.

Related Web Sites

* Principal Investigator Microgravity Services (PIMS) Results Home Page
* NASA Glenn Research Center - SAMS
* NASA Glenn Research Center - MAMS




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Tim Reckart
NASA Official: Thomas St. Onge
Last Updated: February 8, 2011
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