TAS3
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TAS3 - Tri-axes Accelerometer System,
fully assembled.
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TAS3 is a stand-alone Tri-Axes Accelerometer System developed for the Foton M-2 mission.
It features internal data acquisition and data storage.
TAS3 is continuously measuring the residual micro-acceleration level during
Foton payload operation. The acquired data are downloaded after recovery of the hardware.
The downloaded data have been post-processed and analysed after the mission
(see results summary).
The TAS3 processing electronics and housing feature a modular design which allows
expansion with DIMAC electronics modules for the Foton M-3 mission.
(more pictures)
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The main TAS3 specifications are:
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| Parameter |
Value |
Remarks |
| Range |
-32mg..+32mg |
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| Resolution |
1µg |
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| Accuracy |
±1µg or ±0.5% |
whichever is greatest |
| Bandwidth |
0.01Hz..200Hz |
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| Sample rate |
1000S/s |
for each axis |
| Data Storage |
8GByte |
14 days of continuous data logging |
| Mass |
1.8kg |
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| Volume |
165 x 120 x 100 mm³ |
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| Power |
5 Watt |
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Typical design features of TAS3 are:
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- Three Honeywell QA3000 accelerometers are mounted orthogonal to
each other, aligned to the TAS3 coordinate axes. Noise is filtered
from the acceleration signal before it is converted to 16-bits digital data.
- The fully autonomous data acquisition and data storage is controlled by
an 8-bit microcontroller. Acquired data is time-tagged and stored in 8GB
of solid state memory (consisting of four 2GB CompactFlash cards).
- A real-time clock backed up by a small Lithium battery provides
the time reference required to correlate the acquired acceleration
measurements to the Foton mission timeline.
- A full duplex RS422 asynchronous data interface allows software upload
(64kByte of Flash program code capacity) and stored data download during
ground operations.
- TAS3 power interface electronics interface to the Foton power bus and provide
failure protection, inrush current limiting, noise filtering, and galvanically
insulated secondary power supplies.
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TAS3 has been flown on the Foton M-2 flight in June 2005. The Foton M-2 mission was fully successful
and the recovered data were successfully post-processed and analysed (see results summary).
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ESA ordered DIMAC flight hardware complementing the TAS3 system for delivery in 2007. The
DIMAC sensor microgravity measurement bandwidth [0Hz .. 0.01Hz] complements the TAS3 bandwidth.
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Related pages:
DIMAC FM project
RedShift reference projects
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