Apparatus and method for measuring visibility and present weather
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United States of America Patent
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Mar 9, 1999
Issued Date -
N/A
app pub date -
Oct 24, 1996
filing date -
Jan 11, 1994
priority date (Note) -
Expired
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Abstract
The invention relates to an apparatus and method for measuring visibility and present weather. The apparatus includes a light source (1) for directing a light ray toward the object (9) to be measured, a detector (3) for measurement of light which is forward scattered from the object (9), and computing elements (12-15) adapted to differentiate the signal representing the forward scattered light from signals representing stray or ambient light. The apparatus may include a pulsed light source, a receiver (19) for receiving directly backward reflected/scattered light pulses, and computing elements (11) for computing the propagation delays of the different backward reflected components in the received pulse-shaped optical signal.
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