HACH/OTT EnvironmentalInternational Sales MeetingJanuary 2006 1 OTT Parsivel Enhanced Precipitation...
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Transcript of HACH/OTT EnvironmentalInternational Sales MeetingJanuary 2006 1 OTT Parsivel Enhanced Precipitation...
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
HACH/OTT Environmental International Sales Meeting January 2006 2
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®
HACH/OTT Environmental International Sales Meeting January 2006 3
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
HACH/OTT Environmental International Sales Meeting January 2006 4
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
HACH/OTT Environmental International Sales Meeting January 2006 5
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
HACH/OTT Environmental International Sales Meeting January 2006 6
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
HACH/OTT Environmental International Sales Meeting January 2006 7
Interfaces and System Applications
HACH/OTT Environmental International Sales Meeting January 2006 8
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.
HACH/OTT Environmental International Sales Meeting January 2006 9
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
HACH/OTT Environmental International Sales Meeting January 2006 10
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
HACH/OTT Environmental International Sales Meeting January 2006 11
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
HACH/OTT Environmental International Sales Meeting January 2006 12
Satellite Transmission
GOES / Meteosat Satellite
Data Collection Platforms
Receiving Stations
HACH/OTT Environmental International Sales Meeting January 2006 13
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
HACH/OTT Environmental International Sales Meeting January 2006 14
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)
HACH/OTT Environmental International Sales Meeting January 2006 15
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
HACH/OTT Environmental International Sales Meeting January 2006 16
Meteosat footprint
2nd satellite at 63°E available!!
HACH/OTT Environmental International Sales Meeting January 2006 17
GOES Footprint
GOES 10 (WEST) GOES 12 (EAST)