Ceilometer

Japanese: シーロメーター
Ceilometer
A machine that measures the height of cloud bases. It is used at airports to know the altitude of cloud bases. It uses a laser beam to measure the time it takes for the beam to reflect off the cloud base and return, and determines the altitude.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
雲低の高さを観測する機械。飛行場などで雲低高度を知るために用いられる。レーザー光を利用して雲低で反射して戻ってくるまでの時間を測定して高度を決める。

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