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Extra info for Fundamentals of Wireless Sensor Networks: Theory and Practice (Wireless Communications and Mobile Computing)

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1 The Sensing Task A large number of devices are used in traffic control systems. These include video, sonar, radar, inductive loops, magnetometers, microloop probes, pneumatic road tubes, piezoelectric cables, PVDF wire, and pneumatic treadle. Video and sonar-based sensing systems need to be installed on poles, while inductive loops, magnetometers, and pneumatic treadles can be embedded into the transportation infrastructure. Camera-based systems involve human operators to process images, identify incidents, and assign speed rankings.

Unfortunately, building new roads is not a feasible solution for many cities of the world owing to the lack of free space and the high cost of demolition of old roads (streets). Many consider better regulation of transportation systems as the only sustainable solution to road congestion. One approach to dealing with congestions is to put in place distributed sensing systems that reduce congestion. These systems gather information about the density, sizes, and speed of vehicles on roads; infer congestions; and suggest to drivers some alternative routes and emergency exits.

The induced electromotive force in a closed loop is directly proportional to the rate of change of magnetic flux through the loop. This can be better explained by moving a conductor through a magnetic field, which induces a voltage in that conductor. The induced voltage is proportional to the speed of movement, the length and cross-sectional area of the conductor, and the strength of the magnetic field. If the conductor forms a solenoid, the number of turns of the conductor influences the induced voltage.

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