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instruments:ceilo:ceilometer_jen

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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


click to enlarge

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 105650±1001)
Beam diameter expanded to: 90 mm
Laser divergence < 0.3 mrad
FOV Receiver 0.45 mrad
range gate length 15m
Voltage 230VAC, +/- 10 % / 50 Hz
Max. power consumption 0,8 kW (all heater are running)
1)
varies in time
instruments/ceilo/ceilometer_jen.1416835482.txt.gz · Last modified: 2016/04/07 19:53 (external edit)