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