====== Jenoptik/Lufft CHM15k Ceilometer ====== {{:wiki:instruments:ceilo_jenoptik_01.jpg?direct&350|CT25K ©B. Pospichal}} \\ //Jenoptik CHM15k ceilometer installed at Jülich// * [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser2.html?site=JOYCE&date=-1&UpperLeft=Ceilo_chm15k_raw&UpperRight=Ceilo_chm15k_uncalibrated&LowerRight=default&LowerLeft=default|Quicklook archive]] * Current observations (click on image):

\\ //The figure shows raw backscatter signal as functions of time and height. Red curves indicate cloud base heights and blue curves indicate aerosol layer heights as derived by the measurement software.// ===== History ==== ^ Period ^ Place ^ Project ^ | 03/2013 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | [[http://www.tr32.de|TR32]] | ===== Specifications ===== ^ Parameter ^ Specification ^ | Wavelength | 1064 nm | | Bandwidth | 0.1 nm | | Energy per pulse | 8µJ | | Long-time stability over 12 month (prr) | < 10 % | | Pulse to pulse variance of laser energy| < 3 % | | Pulse duration | 1 ... 5 ns | | Pulse repetition rate (prr) | 5 - 7 kHz | | Number of pulses per profile | 105650±100((varies in time)) | | Beam diameter | expanded to: 90 mm | | Laser divergence | < 0.3 mrad | | FOV Receiver | 0.45 mrad | | range gate length | 15m | | temporal resolution | 15sec | | Voltage | 230VAC, +/- 10 % / 50 Hz | | Max. power consumption | 0,8 kW (all heater are running) | | Manufacturer | [[http://www.jenoptik.com/en_home|Jenoptik]], today CHM15k is produced by [[https://www.lufft.com/products/cloud-height-snow-depth-sensors-288/ceilometer-chm-15k-nimbus-2300/|Lufft]] |