Ceilometer
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A Ceilometer is a device using a laser or other light source to determine the height of a cloud base. An optical ceilometer uses triangulation to determine the height of a spot of light projected onto the base of the cloud; a laser ceilometer determines the height by measuring the time required for a pulse of light to be scattered back from the cloud base.
External links
- National Science Digital Library - Ceilometer (http://www.nsdl.arm.gov/Library/glossary.shtml#ceilometer)