Sensor Types and Technology A sensor network is composed of a large number
of sensor nodes that are densely deployed [1.38,1.39]. To list just a few venues,
sensor nodes may be deployed in an open space; on a battlefield in front of, or
beyond, enemy lines; in the interior of industrial machinery; at the bottom of a
body of water; in a biologically and/or chemically contaminated field; in a commercial building; in a home; or in or on a human body.