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kHz SLR Station Graz

kHz SLR Station Graz. Graz kHz LIDAR. Georg Kirchner, Franz Koidl, Daniel Kucharski Institute for Space Research SLR Station Graz / Austria. Poznan, Oct. 2008. General Idea: How it works. Herstmonceux published this idea in Canberra 2006; for 10 Hz SLR

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kHz SLR Station Graz

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  1. kHz SLR Station Graz Graz kHz LIDAR Georg Kirchner, Franz Koidl, Daniel Kucharski Institute for Space Research SLR Station Graz / Austria Poznan, Oct. 2008

  2. General Idea: How it works .... • Herstmonceux published this idea in Canberra 2006; for 10 Hz SLR • Graz now implemented a kHz LIDAR into the Graz kHz SLR station: • Laser Pulses are transmitted with 2 kHz; • Along each path, photons are backscattered (by clouds, layers ....) • Photons are detected with a SPCM (Single Photon Counting Module) • Epochs of these photons are filled into 100-ns-slots (15 m distance) • For each shot, up to 4096 slots are filled with photon events (> 60 km) • Up to 65000 shots can be accumulated / averaged for each slot • Number of events in each slot, Epoch Time, Az/El of mount are stored

  3. Graz kHz SLR LIDAR „Austria“ Cloud  SPCM Laser 15 m 30 m 45 m 61440 m Control Logic Counter 1 Counter 2 Counter 3 Counter 4096 Graz FPGA Card (ISA Card in PC) PC • Each Counter: 16 Bit, up to 65 k events • Integration time selectable for each cycle • PC stores all counter values, Time, Az, El ...

  4. No Clouds: No reflections .. If there are NO clouds or other reflecting things along the laser beam path: => No reflections detected ....

  5. The kHz LIDAR easily detects clouds ... The SPCM / FPGA can „see“ these reflections: Here in a distance of 7890 m: In this 15-m slot, 335 out of 400 shots detected the cloud in full daylight

  6. kHz LIDAR: Real Time Display • kHz LIDAR example: • Full daylight; • Low Noise, Clear signal • Cloud in 3117 m dist.; • 500 Shots averaged; • @ 2 kHz: 4 meas./s • Az/El/Time/Dist. Record

  7. Lidar scan of some cloudy area ...

  8. Main LIDAR Goals: Collecting data for atmospheric research in the Graz basin: • kHz SLR LIDAR will run automatically day and night during SLR; • It will run in parallel to all SLR activities; • This will collect data sets (3-D-coordinates, 15 m resolution) of: • Clouds, Layers, Inversions, Cirrus clouds etc. • Aircraft Vapor Trails; possibly wind speeds in altitudes • Correlation between SLR Return Rate and atmospheric backscatter • ??? • In addition, dedicated scans can be initiated to: • map dimensions and growing of Cumulo-Nimbus clouds • Measure altitudes of clouds, top levels of CBs etc. etc.

  9. Conclusions • kHz SLR is also a nice and efficient LIDAR system  • Runs in parallel and automatically with SLR • Day & Night operation • Simple and low-cost add-on to collect atmospheric data • Maybe useful also for 10 Hz stations ... "Do not look into the laser beam with your remaining eye !" Thank you 

  10. Slowly scanning through such a sky ...

  11. … results in these records

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