18-07-2013, 02:00 PM
Smart Dust
Smart Dust.ppt (Size: 787 KB / Downloads: 27)
Introduction
Smart Dust is a Wireless Sensor network.
It consists of very small Devices.
The motes are deployed randomly.
Technology - Devices
Thick-film battery
Solar cell
Sensors
Passive Transmitter with corner-cube retroreflector
Active transmitter with laser diode and beam steer
Receiver with photo detector
Technology - Communication
The BTS sends a light ray to the motes.
The light is reflected back or not,
which means means 1 or 0.
It is the usual way to communicate for the motes, only if there is no line of sight.
Challenges - Protocol
Limitations for development are:
Optical links requires uninterrupted line-of sight.
The directional characteristic of the mote transmitter.
Trade-offs between bit rate, energy per bit, distance and directionality.
Applications
Smart Dust may be deployed over a region to record
data for meteorological or geophysical research.
Or it may be used in an environment that is unsuitable for wired sensors.