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Progress Report Geo-CAPE Coastal Ecosystem Dynamics Imager (CEDI) IRAD Repackaging Study. Jason Budinoff / GSFC Cathy Marx / GSFC May 12, 2011. Coastal Ecosystem Dynamics Imager (CEDI) Block Diagram – IDL Baseline. Volume - 7.5 m 3 Mass - 621.4 kg Power - 392 W. Aperture Cover - PowerPoint PPT Presentation
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Progress Report
Geo-CAPECoastal Ecosystem Dynamics Imager
(CEDI)IRAD Repackaging Study
Jason Budinoff / GSFCCathy Marx / GSFC
May 12, 2011
2
Coastal Ecosystem Dynamics Imager (CEDI) Block Diagram – IDL Baseline
Scan Mirror
Primary Mirror
Telescope “Aft”Optics
External Baffle
Enclosure
Optical Bench
Band 2(600-900 nm)
SIR
U Star Trackers (3)(orthogonally mounted)
Aperture Cover (closed during solar cal)
Band 1 (345-600nm)
SWIR Band
Slit
MCT H2RG2Kx2K
HyVISI TCM8050ACustom 1K x 2K
HyVISI TCM8050ACustom 1K x 2K
Calibration SourceThru-hole
Aperture Door Launch Lock
Detectors
• Volume - 7.5 m3
• Mass - 621.4 kg• Power - 392 W
I n t e g r a t e d D e s i g n C a p a b i l i t y / I n s t r u m e n t D e s i g n L a b o r a t o r y
GEO CAPE Study Week: 1/25 – 1/29/10Presentation Delivered: Jan 29, 2010
Use or disclosure of this data is subject to the restriction on the title page of this document
Mechanical Systems, pFinal
Aperture & Calibration Covers Opened
2-Sided Diffuser plate
Scan mirrormechanism
Solar Calibration View
Lunar Calibration & Nadir Science
Views
Why?
•Desire to reduce instrument volume to allow payload to be hosted on other missions
•“Minimally acceptable scientifically viable mission”….help to define this from the bottom up
•GEO-CEDI (IDL) at 7.5m2 too large to allow hosting on some platforms
•Study will evaluate architecture & packaging trades to reduce volume.
Volume Comparison
GEO-CEDI (IDL)7.5 cubic meters
GEO-MDI15.3 cubic meters
GEO-CEDI (IRAD)
4 cubic meters?
Trade Space
•The merit function is lowest volume, then lowest cost.
•Several parameters will be traded:1. Alternate optical packaging, Eff F/#,
folding, etc.2. Reduce gimbal size, alternate gimbal
architectures3. PPS / Jitter control implementation4. Alternate calibration schemes5. Primary Mirror scaling
• Some parameters will not be traded:1. Instrument architecture (Offner Relay slit
spectrograph)2. Spectral range and channel count
Gimbal
•Traditional elevation over azimuth type is baseline
•Evaluate flexure suspension XY scanner; analogous to large, “slow” steering mirror
•Evaluate transmissive cal with XY scanner only– Trade large air gap voice coils vs.
limited angle torque actuators
Alternate Optical Packaging
•Faster telescope•“out of plane” folding options to enable more space efficient packaging– Additional fold optics required– Additional optics (periscope/K
mirror) may be required to maintain slit orientation after folding
Current “IDL” layoutshown
Out of Plane Layout
Channel 1 HyViSi ROIC
345 – 600 nm
Channel 3 H2RG
1225-2160 nm
Channel 2 HyViSi ROIC
600-1100 nm
120mm FSM in
periscope
Slit channel
1+2Slit
channel 3
Calibration
•Specular calibration– IDL concept has
deployable calibration assembly, and required 3 mechanisms for 2 specular targets
•Transmissive calibration?
•Can we reduce number of calibrators?
Diffuser Plate Select
Mechanism
Double sided diffuser
Cover Mechanism
Launch Lock
Precision Pointing System (PPS)
• Add the JHU/APL PPS which utilizes FSM+star tracker+inertial reference (gyro) system to increase S/N, cancel S/C and self jitter– Coupled with scanning gimbal
• How do I get smaller by adding more components?
Alternate Layout
Future Work
•Complete mechanical sizing trade
•Add structural, thermal, optical bench detail
GEO-CEDI (IDL)7.5 cubic meters
GEO-MDI15.3 cubic meters
GEO-CEDI (IRAD)
<7.5 cubic meters
Still have a way to go!