Laser precipitation monitor (Distrometer)



State of the art technology with best cost-performance ratio.

The Thies Laser Distrometer is especially designed for the use in several applications and characterization of precipitation. Thanks to a multitude of measuring variables and configuration variants the use of a Distrometer in various ranges of application is now possible.The optical laser basing measuring principle guarantees a reliable and accurate measurement of all known kinds of precipitation. It is possible to measure the amount, the intensity also as the particle size and the velocity of precipitation. A main advantage of the Distrometer is to measure particles down to 0,16 mm diameter.

  • Typical applicationsmeteorological application
    traffic control
    scientific examination
    airport weather monitoring systems
    Adjustment of weather radar systems

The Distrometer detects and discriminates the different arts of precipitation as drizzle, rain, hail, snow, snow grains, graupel (small hail / snow pellets), and ice pellets with his reliable maintenance-free Laser optic.
The Distrometer calculates the intensity, volume (water equivalent) and the precipitation spectrum ( diameter and velocity) as well as the meteorological visibility (MOR) in the rain and the radar reflectivity (Z).
Latest state of the art technology like DSP, and high quality optical components stand for reliable, precise measurement and results in real-time.
All data will be transmitted via a galvanic isolated RS485 interface to further processing. SYNOP according table 4680, and METAR according table 4678 are implemented.

Principle of operation Laser 785 nm, max 0,5 mW optical power, Laserclass 1M
Measuring area 46 cm² (23 x 2.0 cm)
Classification 440 classes( 22 diameters *20 velocity)
Particle size 0,16…> 8 mm
Particle velocity 0,2 …20 m/s
Distinction for kind of precipitation drizzle, rain, hail, snow > 97% in compar. with synopt. observer
Minimum intensity 0,001 mm/h drizzle
Maximum intensity 250 mm/h
Visibility precipitation MOR 0… 99.999 m
Weather codes Synop wawa 4680, ww 4677; Metar 4678
Radar reflectivity Z = -9,9 ..99,9 dBZ
Data output     RS485 1200…115200 Bd, full duplex 2 opt. coupler 24 V DC 1 mA For precipitation impulses (resolution 0,1, 0,01 or 0,005 mm) resp. frequency for precipitation type
Optional inputs PT100, 0-1 V, 0-1000 Hz, serial synchronous
Ambient temperature -40…+70°C; 0 ..100% r. F., Optional –60…+70°C; 0…100% rH
Protection IP 65
Mounting Mast 48 mm…102 mm; 1.9…4 inch
Power supply 24 V AC /750 mA, alternatively 230 VAC or 115 VAC incl. std. Heaters, protection against reverses connection
Optionally 12 V DC Version, additional heater 230VAC / 150 VA
Housing al, die cast, stainless steel, 270x 170x 540 mm
Weight 4.8 kg
Accessory Software for graphic representation and analysis for Windows basing systems: WIN 98, 2000 XP 9.1700.99.000 PC-program LNM view