UVC Airborne Holographic Lidar Transceiver Marc Hammond David

UVC Airborne Holographic Lidar Transceiver Marc Hammond, David Huish, Tom Wilkerson, Scott Cornelsen Space Dynamics Laboratory Utah State University 435 -797 -9611 [email protected] usu. edu presentation for the Wind Lidar Working Group Sedona, AZ January 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 Doppler Lidar Technology Accelerator • Holographic scan Lidar • 1064 nm (present) • Aerosol / cloud returns as function of azimuth and time • “Cross beam” winds GLOW • Doppler interferometer (“double-edge” etalon) • 355 nm / 1064 nm Lidar • Line-of-sight winds from 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

DLTA Direct Detection Doppler Lidar Instrument Layout Non-Doppler Detector Laser Transmission Laser Rotating hologram

Conical scans for high altitude HOE lidar horizon nadir Nadir-45° sweep ( transonic) Tip-tilt mode

Expected performance-DLTA (nadir) Altitude 20 km

SDL Transceiver Design UVC-16: folded path, 16 in. hologram, 355 nm Length, diam. 30 in. Weight 187 lbs. Optical eff. 6 % 30 RPM Pacific Scientific motor Contitech timing belt ASRC data system Hamamatsu PMT

UVC-16 Performance Photon returns per pulse Horizontal path Clear air Density 2. 5 1019 cm-3 Range gate : Pulse energy 1 m. J 355 nm Telescope diam. 40. 6 cm Obstruction diam 4. 6 cm Optical efficiency 6 %

UVC – 12 Compact Transceiver Weight 107 lbs. Length, diam. 24“ 3 -Rod truss Convex secondary External detector Optical eff. 5% Other details similar to UVC-16

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