TAS2
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TAS2 - Tri-axial sensor assembly, interconnect PCB and
fully assembled top module.
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The Tri-axial Accelerometer Subsystem (TAS) is one of the FluidPac subsystems, measuring
the low-frequency residual acceleration levels (up to 10Hz), with a resolution of 1µg.
Due to the failure of this device during the first FluidPac mission a replacement was needed
for the FluidPac2 mission.
RedShift developed the TAS2 as a replacement for the previous TAS in form, fit and function.
The TAS2 is based on the high-performance high-reliability Honeywell QA3000 series sensors,
which solves the reliability problem that has been experienced during the first FluidPac mission.
(more pictures)
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The main TAS2 specifications are:
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| Parameter |
Value |
Remarks |
| Range |
-32mg..+32mg |
after data reduction by FluidPac DDMS |
| Resolution |
1µg |
FluidPac DDMS data resolution |
| Accuracy |
±1µg or ±1% |
whichever is greatest |
| Bandwidth |
0.05Hz..10Hz |
after digital filtering by FluidPac DDMS |
| Mass |
1.3kg |
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| Volume |
125 x 110 x 75 mm³ |
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| Power |
5 Watt |
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Typical features of the TAS2 design are:
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- A low-noise galvanically insulated power supply is created for the sensors. A DC/DC
converter is used to convert the TAS input voltages (±12V) into the required sensor input
level (±15V).
- The data output lines are galvanically insulated from the sensor output using optocouplers.
- The acceleration signal current output of each sensor is transformed into the required 80kHz
bitstream density signal by a sigma-delta modulator after passing an anti-alias filter.
- The temperature signal current output of the three sensors is time-multiplexed and
transformed into a single (analog) signal that can be read by the FluidPac DDMS.
- The use of SMD electronic components maintains the engineering budgets within the
available limits.
- Emission and susceptibility to electro-magnetic interference is very low due to extensive
EMI filtering on TAS2 power input lines and the fully encapsulating metal housing.
- Although the use of commercial grade components is allowed for the TAS2 design, higher
reliability components have been used for all interface electronics.
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Unfortunately the FluidPac flight model (containing the TAS2) was destroyed due
to a failure of the Soyuz launcher carrying the Foton M-1 satellite (October 2002, see also
'FluidPac' project description).
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Subsequently the FluidPac qualification model has been upgraded in order to
perform the FluidPac2 set of experiments during the Foton M-2 flight
in June 2005. ESA ordered a new flight model of the TAS2 (designated TAS2-bis) for
delivery in 2004. The Foton M-2 mission was fully successful.
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Related pages:
FluidPac project
TAS3 project
RedShift reference projects
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