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3D Stereo Disdrometer A new technique to measure precipitation in real-time Turfschipper 114 | 2292 JB Wateringen | Tel. 0174 272330 | Fax. 0174 272340 | [email protected] | www.catec.nl DISDROMETER O TERE S 3D - Vectorial particle velocity - Improved particle detection - Detection of snow drift - High accuracy - Maintenance-free - ... THE WORLD OF WEATHER DATA 3D Stereo Disdrometer Actually there was no single Cameras and optics are All particle information is The measurement volume instrument providing all chosen in a way that particles generated from images of is clearly defined with an necessary information to fully inside the measurement extinction. uncertainty of the boarder of characterize precipitation volume can be clearly detected less than 1% of corresponding events. For some events like and are nearly invisible outside Rain rate and velocity-size expansion. This allows us to drift of snow or “vertical” the measurement volume. distribution are calculated predict that the accuracy of rain 3D velocity detection Furthermore filters reduce from the sizes and velocities accumulated precipitation was needed to get correct ambient light to a minimum. A of particles passing the amount is significantly precipitation rates. We use a modern Quadcore processor measurement volume. Sizes increased compared to current stereo camera system directing for embedded applications of the particles are calculated light sheet disdrometers. on a homogenous IR LED is used for image evaluation. from their sizes and position light source. For this reason, With the carefully chosen in the camera images and we built a fully automated components, this set-up their deduced position. The and robust 3D stereo camera measures particles sizes from velocities of particles are system for precipitation 0.16 mm to about 30 mm and calculated from at least two characterization. particle velocities from positions in space at different 0.2 to 20 m/s. times. The types of particles The measurement volume is are determined by their size, of about 1 dm³ with a base The system is designed to velocity, as well as their shape area of about 200 cm². All show low sensitivity to some and transparency. materials are long term stable dirt or water drops on the lamp to environmental influences. or camera glasses. In addition, Small particles up to 1.2 mm The system has a heating for our evaluation algorithm is are measured with an accuracy the camera optics and can be based on a relative extinction of +/- 0.05 mm. For larger optionally equipped with a which makes it robust for particles the uncertainty of 150 W heating to prevent icing. slight contamination of the mass is less than 5-15% and camera glasses or lamp. of speed is about 5-10%. If any contamination is This is a great improvement too strong or any defect compared to actual LPM. appears, maintenance can be Below graphics show an requested. example for 5 mg water drops. Typical applications n Meteorology n Climatology n Hydrology n Research n Traffic Control n Airport weather observation systems n Alignment of weather radar systems Mass of 2 mm (5 mg) water drops Velocity of 2 mm water drops (fall height 1.45 m) We present the first fully auto- The main advantages mated system in industrial at a glance: quality for 3D-precipitation eva- n One robust, low luation. Our new precipitation maintenance instrument for instrument shows superior par- - High accuracy of ticle type detection, high accu- accumulated rain amount racy of accumulated volume, - Identification of meteor also under windy conditions, type and evaluation of 3D-velocities. - Due to feature rich self- The instrument is the first diagnosis, improper states which can indentify drift of can be detected at a very snow and “vertical” rain. The early stage and mainte- particle type detection allows nance can be reduced only even the recognition of insects to situation when really and spiders. needed. The shortcomings of former n Improved particle detection principles will be overcome. - Based on size, shape, Our new product will be easy to speed and optical Output of the following parameters: use, robust and will have low properties maintenance requirements. - No erroneous rain events n Total precipitation quantity Optional connectable sensors An additional option of measu- caused by dirt, spider n Particles speed and diameter n Thies US CLIMA ring the Meteorological Optical webs, spiders, insects, n Vectorial particle velocity Part. No.4.920X.XX.XXX Range is planned. seeds, leaves, n Intensity mm/h n Determination of 3D velocity n Variable configurable vector class of precipitation - Identification of snow drift n SYNOP METAR CODES - Reduction of wind n Radar Reflectivity (Z/R Ratio) influence n MOR (in rain) - “Vertical” rain n Memory for data logging on board A new dimension of real-time measuring Example of real measured items 2 mm drop 2 mm milk drop 25 mm ice cube 2 mm fly 5 mm fly spider 3D Stereo Disdrometer 5.4120.XX.XXX Technical Data Principle of operation 3D Stereo camera imaging, IR-LED (850 nm) backlight Measuring base area 200 cm² Measuring volume 1dm³ Distrometer classification Free configurable, standard: 440 classes (22 diameter x 20 speed) Particle size Ø 0.16 … 30 mm Particle speed 0.2 … 30 m/s Distinction of precipitation > 98% compared with synopt. observer kinds: drizzle, rain, hail, snow, non-hydrometeor Detection of 3D falling direction Yes Minimum intensity < 0.001 mm/h drizzle Maximum intensity > 300 mm/h Visibility in precipitation MOR 0 … 99.999 m Weather codes Synop: Tab. 4680 and Tab. 4677; Metar: Tab. 4678 Radar reflectivity Z = -9.9 ... 99.9 dBZ Data output RS 485 1200 … 115200 Bd. Full duplex, half-duplex Several ASCII protocoll 2 opto-couplers 24 V DC, 1 mA for precipitation amount pulses (resolution 0.1, 0.01 or 0.005 mm), rsp. frequency for kind of precipitation Ethernet SD-card (self-logging) Inputs USB, RS485, Ethernet, SD-card Sensor connectivity Thies Climasensor US Ambient temperature -30 to +60 °C, 0 to 100% rel. humidity Protection IP 66 Mounting Mast 48 … 102 mm; 1.9 … 4 inch Power Supply 24 V AC/DC or 115/230 V AC approx. 20W; optionally increased heating of 150W Housing Al die-cast, stainless steel, anodized Al Size 240 x 380 x 800 mm³ Weight 7.5 kg INVISIBLE LASER RADIATION DO NOT STARE INTO BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMEN TS CLASS 1M LASER PRODUCT ADOLF THIES GMBH & CO KG Meteorology – Environmental Technology Box 3536 + 3541 37025 Göttingen · Germany Phone + 49 551 79001-0 Fax + 49 551 79001-65 [email protected] www.thiesclima.com 010310/09/14.
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