Meteo Observations at IGMK

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====== Vaisala CT25K Ceilometer ======

{{:wiki:instruments:ceilo_vaisala_03.jpg?direct&350|CT25K ©B. Pospichal}} \\
//Vaisala CT25K ceilometer installed at Jülich//



[[http://atmos.meteo.uni-koeln.de/~hatpro/jue/ceilo/current/index.html|Current data:]]


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<a href="http://atmos.meteo.uni-koeln.de/~hatpro/jue/ceilo/current/index.html" target="_blank">
<img src="http://atmos.meteo.uni-koeln.de/~hatpro/jue/ceilo/current/bscat.png" width=420>
</a> click to enlarge
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===== History ====
^  Period  ^  Place  ^  Project  ^
| 10/2010 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany |  |
| 09/2007 - 10/2010 | [[http://www.fz-juelich.de/icg/icg-4/index.php?index=500|Selhausen]], Germany | [[http://www.tr32.de|TR32]] |
| winter months 2008/2009 | [[http://www.schneefernerhaus.de/|UFS]], Zugspitze, Germany | [[http://gop.meteo.uni-koeln.de/tosca/| TOSCA]] |
| 2006 - 2007 | Nangatchori, Benin | [[http://amma-international.org/|AMMA]] |

===== Specifications =====

See manual section 1.2.6 {{:instruments:ceilo:ct25k-1_manual.pdf#22|page 8}} 
       and section 5.2.2 {{:instruments:ceilo:ct25k-1_manual.pdf#69|page 56}}.

^  Parameter  ^  Specification  ^ 
| Wavelength | 905 nm |
| Pulse Power | 16 W typical |
| Pulse energy | 1.6μJ ±20%((factory adjustment)) |
| Average Power | 8.9 mW |
| Pulse Width | 100 ns |
| Pulse Repetition Rate (PRR): | 5.57 kHz |
| Number of pulses (PQTY): | 65,536((65,536=2^16=64*1024=4^(7+1) the 7 contained in the last is what you find in the status message)) |
| Averaging time: | 11.7sec (=PQTY/PRR) |
| Time resolution | 15sec ((=> 3.3sec for processing and data transmission)) |
| Range resolution | 50ft = 30m  |
| Range | 200...25,000 ft. (60...7500 m) |
| Laser Divergence | ± 0.53×0.75 mrad (edge×diagonal((the laser is a diode with square shape. The beam thus a pyramid with different opening angles for neighbouring and opposite edges))) | 
| Field-of-View Divergence | ± 0.66 mrad | 
| Telescope diameter | 145mm |
| Tilting angle | 2.5° as of Aug 21 2015 (7° before...)  |
| Size | 760 x 280 x 245 mm |
| Power Consumption | 365 W |
| Weight    | 40 kg |
| Manufacturer |[[http://www.vaisala.com/en/meteorology/Pages/default.aspx|Vaisala]] |