Device for measuring cloud height

Details Device for measuring cloud height Device for measuring cloud height

G - Physics

01

S

343/6

G01S 17/88 (2006.01) G01S 17/10 (2006.01) G01S 17/95 (2006.01)

Patent

CA 1247723

ABSTRACT OF THE DISCLOSURE A ceilometer operating according to a gating method integrates output signals from a light receiver. The output signals are passed by analog gating means during consecutive time slots following each other at the transmitter frequency and being phase shifted relative to transmitted light pulses. The phase shift of the time slots is varied stepwise after preset time intervals. Signals integrated during a time interval are digitalized, processed in a microprocessor and stored in a memory according to height values determined by respective phase shifts of the time slots. The microprocessor forms a smooth function of the signals according to height values, differentiates the smooth function, computes maxima and minima, determines maxima differing from a preset threshold value, and selects a maximum which with increasing height value is followed by a minimum. The height corre- sponding to the selected maximum is indicated as a cloud height. -1-

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