Ultrasonic anemometer
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United States of America Patent
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-
Jan 2, 1990
Grant Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Mar 3, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the ultrasonic anemometer, ultrasonic emitting probes (E1-E4) and receiving probes (R1-R4) are mounted to define at least three different paths for propagation of ultrasonic signals in the air, and means (20) are provided for measuring the ultrasonic signal propagation time along the different paths and for calculating the direction and the speed of the wind based upon these measurements. The emitting and receiving probes are low frequency probes, the emitting probes producing a predetermined wave train type signal of frequency between 10 and 200 kHz; and the measuring and calculating means include means for measuring propagation time by correlation between the emitted and received signals.
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