dept. physics & astronomy space research group nick nelms space research group dept. physics...
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Dept. Physics & AstronomySpace Research Group
Nick NelmsSpace Research Group
Dept. Physics & AstronomyUniversity of Leicester
UK
GERB International Science Team22nd Meeting8-11-2004
GERB-4 Detector Report
Dept. Physics & AstronomySpace Research Group
GERB Detector System
Blackbody
IEU
SolarDiffuser
Front End Electronics
Focal Plane Assembly
Dept. Physics & AstronomySpace Research Group
GERB-4 Goldblack
Spectral Reflectance – repeatability results
0
5
10
15
20
25
0 5 10 15 20 25 30 35 40
Wavelength (um)
%R
Dept. Physics & AstronomySpace Research Group
GERB-4 Goldblack
Qualification
Successful testingBulk spectral absorptionPixel level spectral absorptionRadiation testSample vibration testDetector vibration testAccelerated life testStandard life testThermal cycle in airThermal cycle in N2
Thermal vacuum test
Dept. Physics & AstronomySpace Research Group
GERB-4 Goldblack
Flight detector blacking
Strip deposition followed by laser reticulation selected as flight blacking method –
No mis-alignment of blacking on pixels
Improved pixel profile
Pre-black Post-black Post-laser
Dept. Physics & AstronomySpace Research Group
GERB-4 Flight detector programme status
19 un-blacked flight detectors selected from Wafer 31
Detector level spectral reflectance measurements consistent with substrate level measurements
First batch (6 off) of flight detectors successfully produced
Blacking of second batch starts w/b 08/11
Dept. Physics & AstronomySpace Research Group
GERB-4 FPA Status
Silicon substrates – in house, inspected
ASICs – in-house, tested and qualified
Ceramic substrates – in-house, inspected
Molybdenum backplates – in house
Cover plates – in house
Connector substrates – in house, inspected, tested
Dept. Physics & AstronomySpace Research Group
GERB-4 Detector System Schedule
Front End Electronics build completed, tested, coated and qualified.
Blackbody test at AEAT required – still to be scheduled.
Harness – complete and tested – bake-out in November.
FPA assembly due to begin w/b 08/11/04.
FPA calibration begins Jan 05.
Dept. Physics & AstronomySpace Research Group
GERB-4 Detector calibration
Calibration facility schematic
Dept. Physics & AstronomySpace Research Group
GERB-4 Detector calibration
Calibration facility
All components in-house including calibrated reference detectors (Si diode, pyroelectric)
First-light expected w/b 22/11/04
Dept. Physics & AstronomySpace Research Group
Detector calibration
Calibration aims
Relative spectral response measurements
0.2 m interval
0.3 – 3.5 m
0.5 m interval
3.5 – 7.0 m
1 m interval
7 - 20 m