Introduction. Weather Information. All Components of AWS. ISS . (. I. ntegrated. . S. ensors. . S. tation). Anemometer. Temperature. Outdoor Thermometer. Sensor . board. Radiation shield. Outdoor Thermometer.
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Presentation on theme: "Automatic Weather Station (AWS)"— Presentation transcript:
Slide1
Automatic Weather Station (AWS)
Slide2
Introduction
Slide3
Weather Information
Slide4
All Components of AWS
ISS
(
I
ntegrated Sensors Station)
Anemometer
Slide5
Temperature
Slide6
Outdoor Thermometer
Sensor
board
Radiation shield
Slide7
Outdoor Thermometer
Inside radiation shield
Thermistor
Thermistor:
Resistance varies with temperature
Slide8
Outdoor Thermometer
Radiation Shield
Slide9
Relative Humidity
Water vapor in air is saturated, no more water can be carried by air.
RH =
100% ?
Slide10
Outdoor Hygrometer
Inside radiation shield (next to the thermometer)Working Principle:Measure the change in resistance or capacitance to evaluate change in humidity.
Hygrometer
Slide11
Rainfall
Unit: mm / inFunnel shape rain collectorCollect rain drops
Rain collector
Hole
Used by HKO
Slide12
Rainfall
1 tip = 0.2 mm
Rainfall = tipping times x 0.2 mm
Cycle
A
B
A
B
Slide13
Ultra Violet (UV) Index
Wavelength(λ) for UVI: 295 to 325 nmAdjusted according to the sensitivity of human skin (McKinlay-Diffey Erythema action spectrum)No unitTypical value: 15 (highest record in HK)
Sensor
Bubble Level
Slide14
Solar Radiation
Power of sunlight on a surface - irradianceUnit: Watt per meter square (Wm-2) - Power per unit area
Sensor
Bubble Level
Slide15
Solar and UV sensor
bubble level
Adjust the sensors until the bubble is at the centre of the black circle
Slide16
Wind Speed
Used by HKO
Wind vane
Anemometer
Wind cup
Slide17
Wind Speed
Wind
Slide18
Wind Direction
Record the wind directionWind vane points to where the wind come fromMounting bar must point to north when installExpressions:degree (o)16 directions (i.e, E, S, W, N, NE, SE, NW, SW, NNE, ENE, ESE, SSE, NNW, WNW, SSW, WSW)
Wind vane
Mounting bar
Point North
Slide19
Pressure
Barometer in the console
Working principle:Measure the resistance of thin film (薄膜) in piezoresistive (壓阻式) sensor exerted by the atmosphere Unit: Millimeter of mercury (mmHg)Millibar (mbar)Hectopascal (hPa)
Pressure trend:
important for weather forecasting
Used by HKO
Hecto = 100
Slide20
Sensor Interface Module
Collect raw data from all sensorsTransmit coded data to the consoleMax range: 300m
Console
UV
SUNRAINWINDTEMP& HUM
Slide21
Console
Receive and decode data from sensor interface moduleDisplay latest weather informationTransfer data to computer for:display and storagewebpage generation sending back to Co-WIN database server
Slide22
Co-WIN website
Website: http://weather.ap.polyu.edu.hk/
Co-developed by HKO and PolyU AP
Slide23
Co-WIN website
AWSs located at different school and organization membersKeep sending data back every minute to Co-WIN database server in the Department of Applied Physics, HKPolyU via internetProvide latest weather information to the publicAs a local weather reference complementary to weather stations of HKO
Slide24
Co-WIN website
Parameters in weather map:TemperatureMax/Min TemperatureRelative HumidityWind SpeedRainfallUV IndexSolar RadiationPressure
Slide25
Co-WIN website
View weather data history from different locationTime series display
Slide26
Co-WIN website
Download weather data historyData exported in .csv formatMS Excel compatible
Slide27
Co-WIN website
DevelopmentMore weather information will be available soonRelease of new design with Google mapIntegrate more functions for mobile learning
