Measuring and testing – Fluid flow direction – With velocity determination
Patent
1997-02-26
1998-07-21
Biegel, Ronald L.
Measuring and testing
Fluid flow direction
With velocity determination
7317011, G01P 518, G01W 102
Patent
active
057837457
ABSTRACT:
Wind for speed, direction, and temperature measurement is passed along a plane. A sound wave generating transducer (speaker) is addressed to the plane. At least two, and preferably three sound wave receiving transducers (microphones) surround the sound wave generating transducer and are preferably located on the plane. A phase locked loop circuit maintains the same sound wave length between the sound wave generating transducer and one fiducial sound wave receiving transducers. By noting differing phase of sound wave at the two remaining sound wave receiving transducers, temperature compensated wind speed and direction can be determined. Additionally, and with the input of the change of frequency necessary to maintaining the same sound wave length between the sound wave generating transducer and the one fiducial sound wave receiving transducer, temperature of the passing air can be determined. In the preferred embodiment, a sound reflector plane overlies and underlies the plane within which the wind to be measure passes. This latter configuration decreases instrument sensitivity to surrounding obstacles. A highly accurate, durable, compact and temperature insensitive sonic anemometer/thermometer is disclosed.
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