Automatic Weather Station (AWS)
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Automatic Weather Station (AWS)

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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Automatic Weather Station (AWS)




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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

Slide28

END