2DVD
HIGHLY ACCURATE DEVICE
WITH UNIQUE RESULTS
OUTCOMES
THE 2DVD PROVIDES FOLLOWING DATA
- Frontview of each raindrop
- Sideview of each raindrop
- Vertical fall velocity
- Timestamp for each particle
- Diameter of raindrops
- An estimate of the horizontal velocity of raindrops
- 3D reconstruction is possible
IN ADDITION, FOLLOWING DATA ARE COMPARED
- Rainrate vs. time
- Dropsize distribution
- Vertical velocity vs. equivolumetric diameter
- Oblateness vs. diameter
FOR MORE INFORMATION CLICK THE LINKS BELOW:
Capabilities of the VIEW_HYD application
2DVD Demo Software with examples
MEASURING PRINCIPLE
HOW THE 2DVD WORKS
The 2DVD is working on the basis of two high-speed cameras,
permanent illumination and recording.
Details
Specifications
The OUTDOOR UNIT measures every single precipitation particle: for example rain drops, hailstones or snowflakes. The INDOOR UNIT’s analysis PC gives detailed information about size, shape, state of aggregation, orientation and fall speed of each precipitation particle (see Outcomes)
- VERTICAL RESOLUTION: better than 0.17 mm for velocity < 10 m/s
- HORIZONTAL RESOLUTION: better than 0.17 mm for velocity < 10 m/s
- VERTICAL VELOCITY: accuracy better than 4 % for velocity < 10 m/s
- RAIN RATE COMPARED TO TIPPING BUCKET: differences are typically less than 10 %
- INTEGRATION TIME FOR RAIN RATE: individual drops recorded,
in viewer to be specified between 15 sec. and 12 hours
BENEFITS
CONSTANTLY, AUTOMATIC RECORDING AND
ACCESS TO EVERY SINGLE PRECIPITATION PARTICLE
- Assessment of individual precipitation phase contributions:
solid, liquid, molten, frozen - Continuous observation of measurement area
- No splashes counted:
only the inner part of the measurement inlet is taken for data processing
the outer part which is influenced by splashes from the edges is ignored - Fall velocity measured: special importance for mixed phase events - the special arrangement of the two cameras in different planes allows measurement of the fall velocity
- Location information: analyses on subsets of the measurement area are possible
ALL OVER THE WORLD
MORE THAN 100 MEASUREMENT SITES WORLDWIDE
Originated in the area of weather radar and propagation research, the 2DVD are now suited for all kinds of applications where details on precipitation are of interest.
Application Examples
METEOROLOGY AND ENVIRONMENT
- Adjustment of weather radar systems (Air) Traffic control
- Erosion of soil through raindrop impact
- Hydrological models for flood warning and water resource management
TELECOMMUNICATION AND WAVE PROPAGATION
- Prediction of specific rain attenuation
- Explanation of tropospheric polarization rotation
- Propagation effects in mixed phase precipitation
- Input for propagation channel models
INDUSTRIAL APPLICATIONS
- Test of spray nozzles
- Measurement of artificial rain
- Efficiency of irrigation systems
