1 / 13

Progress Report Geo-CAPE Coastal Ecosystem Dynamics Imager (CEDI) IRAD Repackaging Study

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

sukey
Download Presentation

Progress Report Geo-CAPE Coastal Ecosystem Dynamics Imager (CEDI) IRAD Repackaging Study

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Progress ReportGeo-CAPECoastal Ecosystem Dynamics Imager (CEDI)IRAD Repackaging Study • Jason Budinoff / GSFC • Cathy Marx / GSFC • May 12, 2011

  2. Coastal Ecosystem Dynamics Imager (CEDI) Block Diagram – IDL Baseline • Volume - 7.5 m3 • Mass - 621.4 kg • Power - 392 W Aperture Cover (closed during solar cal) Aperture Door Launch Lock Primary Mirror External Baffle Calibration Source Thru-hole Enclosure Scan Mirror Detectors HyVISI TCM8050A Custom 1K x 2K HyVISI TCM8050A Custom 1K x 2K SWIR Band Optical Bench MCT H2RG 2Kx2K Slit Star Trackers (3) (orthogonally mounted) SIRU Telescope “Aft” Optics Band 2(600-900 nm) Band 1 (345-600nm)

  3. Aperture & Calibration Covers Opened 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 2-Sided Diffuser plate Solar Calibration View Lunar Calibration & Nadir Science Views Scan mirror mechanism Use or disclosure of this data is subject to the restriction on the title page of this document GEO CAPE Study Week: 1/25 – 1/29/10 Presentation Delivered: Jan 29, 2010 Mechanical Systems, p Final

  4. 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.

  5. Volume Comparison GEO-MDI 15.3 cubic meters GEO-CEDI (IDL) 7.5 cubic meters GEO-CEDI (IRAD) 4 cubic meters?

  6. Trade Space • The merit function is lowest volume, then lowest cost. • Several parameters will be traded: • Alternate optical packaging, Eff F/#, folding, etc. • Reduce gimbal size, alternate gimbal architectures • PPS / Jitter control implementation • Alternate calibration schemes • Primary Mirror scaling • Some parameters will not be traded: • Instrument architecture (Offner Relay slit spectrograph) • Spectral range and channel count

  7. Gimbal • Traditional elevation over azimuth type is baseline • Evaluate flexure suspension XY scanner; analogous to large, “slow” steering mirror • Evaluate transmissivecal with XY scanner only • Trade large air gap voice coils vs. limited angle torque actuators

  8. 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” layout shown

  9. Out of Plane Layout Channel 2 HyViSi ROIC 600-1100 nm Channel 1 HyViSiROIC 345 – 600 nm Channel 3 H2RG 1225-2160 nm Slit channel 1+2 Slit channel 3 120mm FSM in periscope

  10. Calibration Double sided diffuser • 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 Launch Lock Cover Mechanism

  11. Precision Pointing System (PPS) • Add the JHU/APL PPS which utilizes FSM+startracker+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?

  12. Alternate Layout

  13. Future Work • Complete mechanical sizing trade • Add structural, thermal, optical bench detail GEO-MDI 15.3 cubic meters GEO-CEDI (IDL) 7.5 cubic meters Still have a way to go! GEO-CEDI (IRAD) <7.5 cubic meters

More Related