Vaisala WXT510 Uživatelský manuál stáhnout pdf (Strana 6)

Vaisala Instruments Catalog 2005

Ref. B210435en rev. A

WEATHER MULTI-SENSOR

139

Operating Principles of Wind and Rain Measurement

Time-of-flight for a sonic impulse from the transmit transducer to

the receive transducer is determined for both directions. Simple

algebra allows solving for the parallel component of wind velocity

independently of the static speed of sound.

The equilateral triangle configuration of the three transducers

provides three possible sets of basis vectors. The combinations yield

bi-directional measurements on the paths labeled A, B and C. These

measurements are used to determine the wind velocity components

parallel to each of the three paths.

The precipitation sensor detects the impact of individual raindrops.

The voltage signals U

resulting from the impacts are proportional to

the volume of the drops V

and therefore, the signal of each drop can

be directly converted to accumulated precipitation P.

Vaisala WINDCAP

Sensor

The Vaisala WINDCAP® Sensor enables wind measurement

with no moving or wearing parts. The measurement of wind

speed and direction is based on sonic technology.

The Vaisala WINDCAP® Sensor is used in Vaisala Weather

Transmitter WXT510 and Vaisala Ultrasonic Wind Sensor

WS425.

Vaisala RAINCAP

Sensor

The precipitation measurementy used in the Vaisala Weather

Transmitter WXT510 is based on Vaisala’s proprietary

RAINCAP® technology. This acoustic rain measurement

technology measures rainfall literally drop by drop, which

means that the measurement is not affected by evaporation

or wetting losses. In addition, the measurement is immune to

flooding induced errors, because the sensor does not collect

water.

The Vaisala RAINCAP® Sensor has no moving parts and

therefore it requires practically no maintenance.

Incorporates Latest Sensor Technology

WXT510

WEATHER_2005_GLOBAL.PMD 7.12.2004, 7:40139

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