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ceilometer
A ceilometer is a device that uses a laser or other light source to determine the height of a cloud base. Ceilometers can also be used to measure the aerosol concentration within the atmosphere.
== Hazards ==
They can sometimes be fatal to birds, as the animals become caught in lightbeams and suffer exhaustion and collisions with other birds.〔(10,000 Birds Trapped In The World Trade Center Light Beams ), StapleNews, September 16, 2010.〕 In the worst recorded ceilometer non-laser lightbeam kill-off, approximately 50,000 birds from 53 different species died at the Warner Robins Air Force Base in the United States during one night in 1954.
Laser ceilometers use invisible lasers to observe cloud base. Using optical instruments such as binoculars near ceilometers is not recommended because lenses in instruments could concentrate the beam and damage eyes. Ceilometers can be installed on angles in the approach of aircraft to a runway.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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