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Table of Contents
Ceilometer Jenoptik CHM15k Nimbus
Mentor: A. Hirsikko
Principle
The CHM 15k ceilometer measures aerosol height profiles. It determines cloud base heights and penetration depths, mixing layer height and vertical visibility. Within its operating range up to 15 kilometers (50,000 feet), it reliably detects multiple cloud layers and cirrus clouds. The CHM 15k mesures and processes data using the LIDAR technique.
Instrument
Current setup at Research Center Jülich on the roof of IEK-8: Jenoptik CHM15k ceilometer.
Data
<html> <center> <a href=“http://gop.meteo.uni-koeln.de/~hatpro/jue/ceilo/jenopt/” target=“_blank”> <img src=“http://gop.meteo.uni-koeln.de/~hatpro/jue/ceilo/jenopt/ceilo_jenoptik.png” width=420> </a> <br>click to enlarge </center> </html>
History
Period | Place | Project |
---|---|---|
03/2013 - today | Research Center Jülich, Germany | TR32 |
Specifications
See manual section 3, page 11 .
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 | 105600±10001) |
Beam diameter | expanded to: 90 mm |
Laser divergence | < 0.3 mrad |
FOV Receiver | 0.45 mrad |
Voltage | 230VAC, +/- 10 % / 50 Hz |
Max. power consumption | 0,8 kW (all heater are running) |