Concept information
PREFERRED TERM
ceilometer
DEFINITION
- Instrument measuring the height of the cloud base above ground level. The instrument uses either triangulation by projecting a light spot onto the cloud base at a slant angle while varying and measuring the slant angle so the light spot appears over the detector located at a distance and looking upwards, or by shooting a laser pulse vertically upwards to the cloud base and measuring the time until the reflected pulse arrives at the detector located next to the laser.
BROADER CONCEPT
URI
https://vocabulary.actris.nilu.no/actris_vocab/ceilometer
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