Vendula Hejlová - Wireless sensor network components for monitoring air pollution in the urban environment: criteria and analysis of its selection

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Wireless sensor network components for monitoring of air pollution in urban environment:

criteria for their selection

Author: Vendula HEJLOVÁ


WHY TO MONITOR AIR POLLUTION?

• serious problem nowadays

• emissions of pollutants affect ecosystems, environment, human health and quality of life

• sources of air pollution• antropoghenic• natural


WIRELESS SENSOR NETWORK

• new fast evolving technology consisted of small devices (nodes) situated in the field and the gathering point (gateway)

• nodes are able to• communicate with each other (short, long distance)

• communicate with gateway (basic station)

• measure chosen environmental or socioeconomic characteristics in real time

• be distributed in high density

• used in environmental and socioeconomic domain


WIRELESS SENSOR NETWORK COMPONENTS

• 2 major groups of wireless sensor network components

• hardware» nodes (may be equipped by sensors) » gateway

• software


PRE-SELECTION OF WIRELESS SENSOR NETWORK COMPONENTS

• pre-selection steps involve: – determination of the reason of building– choosing the localization of the nodes– determination of the number of nodes– searching for the producers (analyzing commercially

offered products (options))– defining the criteria for the evaluation of selected

options– defining the ideal option– comparing criteria parameters of offered options to

the ideal (suggested) one


CRITERIA FOR THE NODES SELECTION

• criterion is in the decision making process called a scale and it is used for the comparison of parameters

• every criterion is evaluated by its importance

• nodes are the most important part of the wireless sensor network

• 25 criteria, 8 groups of criteria for nodes were defined for the wireless sensor network which will be suitable for monitoring of air pollution in the urban area


CRITERIA FOR THE NODES SELECTIONCriteria group Criteria

1 Sensor boards/sensors

» sensor board for monitoring of air pollutants from the producer» possibilities for connecting sensors monitoring of air pollutants» count of connected sensor boards/sensors» sensor measurement interval [min]» calibration» built in sensors

2 Communicationmodels

» communication among nodes» communication possibilities» communication range [m]» topology

3 Energy sources

» energy source » battery life [year]» energy consumption


CRITERIA FOR THE NODES SELECTIONCriteria group Criteria

4 Environmental resistance

» storage temperature [°C]» encapsulation

5 Technical aspects

» programming skills» software» memory size [KB]» I/O

6 Expansion options

» flexibility» sensor boards/sensors change» GPS

7 Physical parameters

» size [mm]» weight [g]

8 Price

» price [€]


WIRELESS SENSOR NETWORK IN OLOMOUC (OWSN)

• major aim - monitoring of air pollution

• observed elements:• temperature, humidity, CO2, CO, NO2, NH4, VOC,

solar radiation, wind speed and direction

• 15 nodes equipped with sensors


REQUIREMENTS FOR THE OWSN


ANALYSIS WEIGHTS OF SUGGESTED CRITERIA

determined by The Rank Based Method

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THANK YOU FOR YOUR ATTENTION

Education

Vendula Hejlová - Wireless sensor network components for monitoring air pollution in the urban environment: criteria and analysis of its selection