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D I STROMETER

D I STROMETER. D I STROMETER. A Distrometer is an instrument that measures the size of raindrops. There are many different types of distrometer. The 2D-Video-Distrometer.

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D I STROMETER

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  1. DISTROMETER

  2. DISTROMETER A Distrometer is an instrument that measures the size of raindrops. There are many different types of distrometer.

  3. The 2D-Video-Distrometer • It records two side view optical images of each rain drop. For this reason it is called a 2D-Video-Distrometer or 2DVD for short.

  4. The 2D-Video-Distrometer is a newly developed ground based point monitoring precipitation gauge, working on the basis of video cameras. Originated in the area of weather radar and tropospheric wave propagation research, the 2D-Video-Distrometer is designed to meet the needs generally of anybody interested in details on precipitation.

  5. The measurements reveal classification of precipitation at measurement site as well as full particular on single hydrometeors. Such comprehensive data have not been available up to now. Of each raindrop, snowflake hailstone reaching the measuring area, the front view, the side view and the velocity are measured and recorded. The resolution of the digitizing grid is in the order of 0.25 mm. For a reliable classification of precipitation events distributions of size and velocity of particles as well as of oblateness of drops are generated in real time. Of course the rainrate is given.

  6. Instrument functions • Monitors precipitation. • Identifies precipitation type (rain, snow, hail, drizzle..). • Provides hydrometeor size distribution (for drops, snowflakes, hailstones); this is called disdrometric function. • Measures instantaneous rainfall rate. • Gives the total rainfall in a given time interval.

  7. The knowledge of hydrometeor size distribution (disdrometric function) is crucial in investigating, or forecasting, such events and occurrences as soil erosion and percolation, landslides, evapotranspiration, plant physiology, spring seepage etc., or in several other applications, such as in meteorological radar calibration, in defining reflectivity vs rainfall rate relationships, etc..

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