wind lidar working group, 29 june 2005 welches, or doppler lidar scanning telescope technology geary...
TRANSCRIPT
![Page 1: Wind Lidar Working Group, 29 June 2005 Welches, OR Doppler Lidar Scanning Telescope Technology Geary Schwemmer Meeting of the Working Group on Space-based](https://reader035.vdocument.in/reader035/viewer/2022070415/5697bfb61a28abf838c9e0af/html5/thumbnails/1.jpg)
Wind Lidar Working Group, 29 June 2005 Welches, OR
Doppler Lidar Scanning Telescope Technology
Geary Schwemmer
Meeting of the Working Group on Space-based Lidar Winds
Welches, Oregon
June 28- July 1, 2005
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Topics
• Requirements
• Constraints
• Approaches
• Comparisons
• Roadmaps
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Requirements
• Narrow field of view
• Large collecting area
• Large off-nadir scan angles (~30-50°)
• Step-stare preferred over continuous scanning
• Rapid slew
• 2 ~orthogonal looks into each sample volume
• Laser bore-sighting
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Constraints
• Volume• Mass• Power• Vibration• Torque• Momentum compensation• Space environment
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Approaches
• Conventional telescope w/ rotating mount
• Multiple telescopes
• Scanning flat mirror
• Rotating wedge prism
• Rotating Fresnel prism
• Rotating HOE
• Multiplexed HOE / SHADOE
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Comparisons
Mass and Power comparisons. (Source - GSFC Doppler Lidar Technology assessment, 2001.)
System Total Mass Total Avg. Power
Rotating SiC 1.25 m reflective telescope
302 kg 260 W
Scanning flat mirror >450 kg
Rotating Fresnel wedge
>450 kg
Rotating 1.5-m HOE 152 kg 130 W
1.5-m ShADOE 65 kg 20 W
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Holographic Optics
IR
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Hybrid SHADOE Roadmap
TRL5TRL4
TRL3
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Key Remaining Issues
• Space qualification• 2-micron performance
(diffraction limited)• SHADOE demonstration• System trades:
– laser– # of FOVs & dwell time / spatial
resolution– hybrid configuration
• Scaling to 1 meter
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Conclusions
• Conventional scanning telescope too heavy• 2-micron & 355 nm requirements very
different (size & image quality), perhaps equally difficult
• HOE technologies offer significant weight and power savings for large apertures
• Perhaps the lowest TRL of UV Doppler components
• No show stoppers, but significant risk & development
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Wind Lidar Working Group, 29 June 2005 Welches, OR
150°
Baseline Scan Configuration
Satellite nadir ground track
YA= 324 km
YB= 87 km
30°
Z = 400 km, = 40°, A = 75°, B = 15°, C = 45°
YC= 237 km 90°324 km
237 km
3 tracks, 6 lines of sight
0 90
seconds timing
12 7833 57
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Optical Layout(single HOE)
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Wind Lidar Working Group, 29 June 2005 Welches, OR
UV-A exposure effects
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Wavefront Error Correction
Wave-front corrective
prescription applied to cover glass
Wave-front distortion caused by HOE materials
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Hybrid R-T Combination SHADOE Receiver(One FOV shown)
UV Reflection SHADOE
IR Transmission SHADOE
IR Focal Plane
UV Focal Plane