UVC Airborne Holographic Lidar Transceiver Marc Hammond, David Huish, Tom Wilkerson, Scott Cornelsen...
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Transcript of UVC Airborne Holographic Lidar Transceiver Marc Hammond, David Huish, Tom Wilkerson, Scott Cornelsen...
UVC Airborne Holographic Lidar Transceiver
Marc Hammond, David Huish,Tom Wilkerson, Scott Cornelsen
Space Dynamics LaboratoryUtah State University
435-797-9611 [email protected]
presentation for theWind Lidar Working Group
Sedona, AZJanuary 27-29, 2004
Research supported by NPOESS/IPO, NASA, and SDL
© 2004
Outline
• High altitude aircraft : ER-2, Proteus
• Technology fusion basis (DLTA-M) HARLIE (Schwemmer), GLOW (Gentry)
• Performance
• UV– Cornerstone (UVC) transceiver
• UVC design progress at SDL
• Conclusion
Fusion of Two NASA Lidar Technologies
HARLIE
•Holographic scan Lidar•1064 nm (present)•Aerosol / cloud returnsas function of azimuth and
time•“Cross beam” winds
GLOW
•Doppler interferometer(“double-edge” etalon)•355 nm / 1064 nm Lidar•Line-of-sight windsfrom aerosol returns•LOS winds (molecular)from clear air
DLTA
•Holographic scan @ 355 nm•Multi-channel transceiver•LOS winds / Cross beam winds•Aerosol / Cloud morphology•Airborne and ruggedized•Platforms: ER-2 / Proteus•Cal / Val for space-borne wind lidar
Doppler LidarTechnologyAccelerator
DLTA Direct Detection DopplerLidar Instrument Layout
DopplerDetector
Non-DopplerDetector Laser
Rotatinghologram
LaserTransmission
Conical scans for high altitude HOE lidar
Nadir-45° sweep ( transonic) Tip-tilt mode
horizon
nadir
Expected performance-DLTA (nadir) Altitude 20 km
UVC-16: folded path, 16 in. hologram, 355 nm
Length, diam. 30 in.Weight 187 lbs.Optical eff. 6 %30 RPMPacific Scientific motorContitech timing belt
ASRC data systemHamamatsu PMT
SDL Transceiver Design
0 2 4 6 8 10 12 14 16 18 20
Range (km)
10-2
10-1
100
101
102
103
Photon Return (Number of Photons) 25ns
250ns
1000ns
Pulse energy 1 mJ 355 nm
Telescope diam. 40.6 cmObstruction diam 4.6 cmOptical efficiency 6 %
Horizontal path Clear airDensity 2.51019 cm-3
Range gate :
UVC-16 Performance Photon returns per pulse
Weight 107 lbs.Length, diam. 24“3-Rod truss
Convex secondaryExternal detectorOptical eff. 5%
Other details similar to UVC-16
UVC – 12 Compact Transceiver
UVC - 12
Optical Return Path
View from Detector End
Finite Element Analysis for UVC-12
Displacement Stress
Conclusion
• UVC is a compact, rugged transceiver for fusion of Holographic and Direct Detcction Doppler Lidar
• Thermal and Finite Element Analysis validate the design for flight in high altitude aircraft environment
• Next step: Vibration Analysis of UVC-16 and UVC-12
• Design and fabrication of optical instrumentation for aircraft and satellites a major activity at Space Dynamics Laboratory
• Next design direction: Composite construction for greater strength and savings in weight. Composite technology is a focus area for SDL and Utah State University