khz slr station grazgraz now implemented a khz lidar into the graz khz slr station: laser pulses are...
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kHz SLR Station Graz
Graz kHz LIDAR
Georg Kirchner, Franz Koidl, Daniel Kucharski Institute for Space Research
SLR Station Graz / Austria Poznan, Oct. 2008
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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
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Graz kHz SLR LIDAR
SPCM
PC - Each Counter: 16 Bit, up to 65 k events
- Integration time selectable for each cycle
- PC stores all counter values, Time, Az, El ...
„Austria“ Cloud
Counter 3 Counter 1 Counter 2 Counter 4096
Graz FPGA Card (ISA Card in PC)
15 m 30 m 45 m 61440 m
Control Logic
Laser
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No Clouds: No reflections ..
If there are NO clouds or other reflecting things along the laser beam path: => No reflections detected ....
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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
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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
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Lidar scan of some cloudy area ...
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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.
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Conclusions
Thank you
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 !"
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Slowly scanning through such a sky ...
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… results in these records