| Reflections of this light from the base of the clouds are detected by a photocell in the receiver of the ceilometer. |
| One important use of the ceilometer is to determine cloud ceilings at airports. |
| The ceilometer uses a laser to measure the cloud base height. |
| The ceilometer is designed to produce accurate imagery in varied weather conditions including fog cover and torrential downpours. |
| The contributing cause was that the ceilometer manufacturer had made a slight change in the design of a component. |
| Version 5.2 of the ceilometer algorithm has, in laboratory tests, almost eliminated false reports of this nature. |
