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CDE CDR, September 14, 2004
Your Position, Your Name1
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James1
GATS
Cosmic Dust Experiment (CDE)Science and Calibration
David James
University of Colorado/LASP
303-492-5208
CDE CDR, September 14, 2004
Your Position, Your Name2
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James2
GATS
Science Goals
Monitor the cosmic dust flux variability :
CDE measures dust flux using an impact detector.
Measurement at S/C is directly related to dust input to the mesosphere.
CDE CDR, September 14, 2004
Your Position, Your Name3
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James3
GATS
Dust Detection using PVDF
Depolarization induced current
PVDF Film Al/Ni Contacts
DepolarizationCavity
VolumePolarization P
m
v
VolumePolarization P
VolumePolarization P
CDE CDR, September 14, 2004
Your Position, Your Name4
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James4
GATS
Calibration and Validation Plan
Calibration is performed in two steps:
• Electronics (DN to charge)– Performed at LASP 9/16-9/20
• PVDF Detectors (Charge to mass, given velocity)– SDC calibration with dust accelerator in Heidelberg, Germany is complete– Proposed CDE calibration in early 2006
CDE CDR, September 14, 2004
Your Position, Your Name5
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James5
GATS
E-box Calibration
Calibration of Electronics was performed at LASP before (abbreviated) and after the environmental (full) testing
• Tested full dynamic range of each signal chain 104-1010e charges at 21 individual values (100 events at each of the 21 values injected externally).
• Tested over full range of E-box temperatures (-26 to 50oC)– Full calibration at -26, 0, 15, 30, 50°C– Pre-Environmental Calibration at 20oC
• Repeated for all 14 channels
• Total Calibration generated 14 x 5 x 21 = 1476 data sets of 100 hits.
CDE CDR, September 14, 2004
Your Position, Your Name6
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James6
GATS
Calibration Setup – External Charge Injection
Injection Circuit to Simulate Detector Signal
Environmental Chamber
Data Collection
CDE CDR, September 14, 2004
Your Position, Your Name7
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James7
GATS
Sample CDE Calibration Curves
CDE CDR, September 14, 2004
Your Position, Your Name8
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James8
GATS
Simpson-Tuzzolino Curve
]/[][018.3][ 33.117 skmvgmeN ×=
CDE CDR, September 14, 2004
Your Position, Your Name9
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James9
GATS
CDE will maximize impact rates
CDE detector area ~ 0.1 m2
300 hits/day @ 0.1 m threshold
3 hits/day @ 1.0 m threshold
Science requirement:
100 hits/week → 0.7 m threshold
mass
CDE CDR, September 14, 2004
Your Position, Your Name10
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James10
GATS
15 km/s
10
PVDF Detectors
13
100 hits/week on ~ 0.1 m2
2
100 hits/day
To meet science requirement of 100 hits/week must have a noise floor of 106 electrons.
CDE CDR, September 14, 2004
Your Position, Your Name11
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James11
GATS
Noise floor well below required 106 electrons.
CDE satisfies its science requirements!
CDE Noise Characterization
9*105 e level
CDE CDR, September 14, 2004
Your Position, Your Name12
GATS CDE Pre-Ship Review October 6, 2005
Science and Calibration David James12
GATS
Calibration Summary
Charge injection calibration has been completed and is ready for integration into ground processing software
Determination of noise floor via zero threshold noise collection verifies that CDE meets science requirements
CDE is ready to ship and meets science requirements
