HACH/OTT EnvironmentalInternational Sales MeetingJanuary 2006 1 OTT Parsivel Enhanced Precipitation Identifier / PWS: Laser-based optical system for simultaneous

HACH/OTT Environmental International Sales Meeting January 2006 1

OTT Parsivel Enhanced Precipitation Identifier / PWS: Laser-based optical system for simultaneous measurement of

particle size and velocity in precipitation


Design with two heads No catching losses due to wind

effect, no bucket or vessel Wide intensity range 0,001 to

1200 mm/h Velocity: 0,2 to 20 m/s Sizes: 0,2 to 25 mm Reports according WMO codes

OTT Parsivel®


The sensor's transmitter unit generates a flat, horizontal beam of visible red laser light, which the receiver unit converts into an electric signal.

The absolute amplitude can even change, only dynamic radiometric signal changes gets consideredwhenever a particle falls through the beam anywhere withinthe measurement area.

The ratio of dimming isdirect related to the particles size, and in correlation with duration ofthe extinction, the fall velocity can be derived.

OTT Parsivel® - The Principle


OTT Parsivel® - Type Of Precipitation: Rain Accumulated particles in 60

second interval Drop speed like Gunn-Kinzer

distribution (dashed line) Rain because large number

of drops on the Gunn-Kinzer curve

Derivation to water equivalent

Drops with different shapes relating to sizes and speed

Distinguish of different types of liquid precipitation: drizzle, rain, mixed form in light moderate and heavy classes


Accumulated particles in 60 second interval

Particle speed like Locatelli and Hobbs distribution (dotted line)

Particle speed is very slow Snow because large slow

particle, on or near by the Locatelli and Hobbs curve

Distinguish of solid precipitation: snow, grain, hail and mixed form in light, moderate and heavy classes

OTT Parsivel® - Type Of Precipitation:

Snow


OTT Parsivel® - Operating Software Drop distribution: 32

classes of size and speed Intensity and

accumulation of precipitation

WMO reports: WaWa, WW, Metar, Speci, NWS

Visibility in precipitation Radar reflectivity Laser energy Number of particles Measuring interval Housekeeping data:

heater power, supply voltage, sensor status, temperature


Interfaces and System Applications


Features and high lights

Fully configurable data string in sequence and content, fexibility for wide range of datalogger market

Software controlled heating device for mains ( 50 W ) and medium solar power applications ( 2 W )

Configuration and expert spectrum evaluation SW ASDO

Calibrated precipitation parameter, optical precipitation sensor for unattended operation

Automatic self adjustment at no precipitation event concerning temperature, laser alteration and condamination of optics

Sensor for unattended operation, no further calibration or maintenance required at the sites.


Features and high lights Patented extinction method for simultaneous

measurement of particles size and velocity Only one version and fully configurable for all

applications Multipurpose instrument for PWS, optical

precipitation sensor, spectrum distribution and energy, radar reflectivity and visibility in precipitation (MOR)

Multipurpose interfaces for RS 485, RS 422, SDI-12, Digital Output for state of precipitation and pulse related to 0,1mm

Parallel operation of ASDO (PC-Monitoring and logging) and datalogger with SDI-12


Precipitation intensity- Hydrological Services

- Water Boards- Flood Warning

- Water Resources and Energy- Avalanche Warning Institute

Present Weather SensorEnhanced Precipitation Identifier

- Meteorological Services- Avalanche Warning institutes

- ASOS Systems Airports- Flood warning Systems

- Water Resources and Energy

Precipitation distributionand precipitation energy

- Universities- Soil Research Institutes

- Avalanche Warning Institutes

VisibilityTraffic Monitoring:

- Road Weather Information System- Harbour Monitoring System-Heliport Monitoring System

- Naval Market/Navigation SupplierZ/R-calculation

- Weather Radar Supplier- Weather Radar Network

PWS

PD VMZ

PI

Market and customers


Calibration and Test Bench

Calibration in production cell in full automation procedure

Simulated reference particles in size and velocity by rotating precision disk

Download of data field for laser related tolerances and coefficients, depending on size variation

Factory Acceptance Test Protocol as individual test record

Calibration and test device for weather Services concerning yearly quality inspection


Satellite Transmission

GOES / Meteosat Satellite

Data Collection Platforms

Receiving Stations


User Interfaces

12 VDC Power Supply

RS 232 and open protocol

GPS Antenna, exact time and location

Antenna clutch for Yagi

Power safe mode

LED indication

Easy Use SW for configuration, test and antenna alignment


HDR transmission modes

Certified transmission formats Meteosat (incl. MSG) Self-Timed Mode, Alarm Mode GOES 100, 300 bps; Self-Timed Reporting Mode, Random Reporting Mode International channels (IDC)


Direct Readout Ground Station

Private

Ethernet

~ 2.5 Mbyte/sec

TCP/IP on Ethernet

Antenna

5 m Dish

~ 1.6 GHz

DCP Acquisition

Down converter

~ 150 MHz

DSR II

HYDRAS 3 +

Communication manager


Meteosat footprint

2nd satellite at 63°E available!!


GOES Footprint

GOES 10 (WEST) GOES 12 (EAST)

Documents

HACH/OTT EnvironmentalInternational Sales MeetingJanuary 2006 1 OTT Parsivel Enhanced Precipitation Identifier / PWS: Laser-based optical system for simultaneous