Data Acquisition in sensor Network part 1

1. DATA
MANAGEMENT &
APPLICATION

2. Outline
- CHAPTER 2: Data Acquisition in Sensor
Networks
- Sensor Networks
- Wireless Sensor Network
- Data acquisition
- Sensor data cleaning
- Sensor data storage

3. CHAPTER 2: DATA ACQUISITION
IN SENSOR NETWORKS
Sensor Networks
Wireless Sensor Network
Data acquisition
Sensor data
cleaning Sensor
data storage

4. Sensor
- Sensor is a device that provides a usable output in response to specified
measurement of environment.
- The sensor attains a physical parameter and converts it into a signal
suitable for processing (e.g. electrical, mechanical, optical) the
characteristics of any device or material to detect the presence of a
particular physical quantity.

5. Sensor
- The output of the sensor is a signal which is converted to a human-
readable form like changes in characteristics, changes in resistance,
capacitance, impedance, etc.
- Generally, sensors are used in the architecture of IOT devices.

6. Sensor Networks
- A sensor network is a group of sensors where each sensor
monitors data in a different location and sends that data to a
central location for storage, viewing, and analysis.

7. Sensor Networks:
Application
- Many applications for sensor
networks, from monitoring a
single home, to the surveillance
of a large city, to earthquake
detection for the whole world.
Example: Home security

8. Sensor Networks
- In a sensor network, there are multiple detection stations called sensor nodes, each of
which is small, lightweight and portable.
- Every sensor node is equipped with a transducer, microcomputer, transceiver and
power source.
- The transducer generates electrical signals based on sensed physical effects and
phenomena.
- The microcomputer processes and stores the sensor output.
- The transceiver receives commands from a central computer and transmits data to
that
computer.
- The power for each sensor node is derived from a battery.

9. Example: Sensor node

10. Example: Sensor
node for health
application
https://www.researchgate.net/publication/224809210_A_Review_of_Wearable_Sensors_and_Systems_with_Application_in_Rehabilitation

11. Sensor Networks
WIRED SENSOR NETWORK W I R E L E S S SENSOR NETWORK
Sensor Network Architectures for Monitoring Underwater Pipelines (2011). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3274311/
- Wired networks are either copper or fiber optic cables.
- The wired networks are usually connected to regular sensor devices
that measure specific attributes such as flow rate, pressure,
temperature, sound, vibration, motion, and other important attributes
- Advantages: easy to install and provide power supply for through the
network wires.
- Disadvantages: reliability and security problems
- Advantage: solve some of the reliability problems of current wired
networks.
- Disadvantage: more energy will be consumed from the nodes.

12. Wireless Sensor
Networks
- Wireless sensor network (WSN) refers to a collection of sensors for observing, monitoring and
recording the physical conditions of the environment.
- After observing and recording the behavior of sensors, consolidating the collected data at a
central location is the main task.
- WSNs consist of spatially distributed autonomous sensors to observe and monitor physical
and environmental conditions.
- They are helpful to collectively pass recorded data through the network to a central
location.

13. Wireless
Sensor
Networks
- The following table briefly state
some of the important
characteristics of a WSN.

14. Wireless Sensor
Networks
- WSNs consist of spatially distributed autonomous sensors to observe and monitor physical
and environmental conditions.
- They are helpful to collectively pass recorded data through the network to a central
location.