Ceilometric method and apparatus

Details Ceilometric method and apparatus Ceilometric method and apparatus

1979-07-30

1981-03-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 5, G01N 1506

Patent

active

042595924

ABSTRACT:
In a ceilometric system, light pulses are emitted from a transmitter towards overhead clouds and reflected back down towards a receiver which generates a photodetector signal transmitted by a gate whose gating interval is shifted in time relative to the light-pulse emission instant to define successive range steps. During each dwell at a particular gating interval and range step, the photodetector signal is integrated to develop an integral signal for that range step. The integral signal for each range step is digitalized and stored in a digital storage circuit, ordered in correspondence to the sequence of the range steps. A microprocessor searches for the largest one of the stored integral signals and derives a ceilometric indication in dependence thereon.

REFERENCES:
patent: 3499159 (1970-03-01), Carrier et al.
patent: 3856402 (1974-12-01), Low et al.

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