Ceilometer

From Free net encyclopedia

Image:Wolke-ceilometer.png

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.

A ceilometer consists essentially of a projector, a detector, and a recorder. The projecter emits an intense beam of light above into the sky. The detector, which is located at a fixed distance from the projector, uses a photoelectric cell to detect the projected light when it is reflected from clouds.

External links

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• National Science Digital Library - Ceilometer

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