====== 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:]] click to enlarge ===== 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]] |