progress report geo-cape coastal ecosystem dynamics imager (cedi) irad repackaging study jason...
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Progress Report
Geo-CAPECoastal Ecosystem Dynamics Imager
(CEDI)IRAD Repackaging Study
Jason Budinoff / GSFCCathy Marx / GSFC
May 12, 2011
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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
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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
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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.
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Volume Comparison
GEO-CEDI (IDL)7.5 cubic meters
GEO-MDI15.3 cubic meters
GEO-CEDI (IRAD)
4 cubic meters?
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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
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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
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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
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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+2
Slit channel 3
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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
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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?
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Alternate Layout
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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!