Sensor classification

A sensor is a a device that detect a signal or energy.

Categories of sensors

Categories for various types of sensors includes:

• a) Passive: Sensors that detect some type of energy that is emitted by the target of interest or the change of a natural field caused by the target;
• b) Active: Sensors that transmit some type of energy and detect a change in the received energy created by the presence of motion of the target;
• c) Covert: Sensors that are hidden from view. (e.g. buried sensors);
• d) Visible: Sensors that are in plain view of an intruder;
• e) Line-of-sight: Sensors that perform acceptably only when installed on flat ground with a clear line-of-sight in the detection space;
• f) Terrain Following: Sensors that detect equally well on flat or irregular terrain with uniform detection throughout the detection zone;
• g) Volumetric: Sensors that detect intrusion in a volume of space. The detection zone DHS 1155 of these types of sensors is usually difficult to identify;
• h) Line Detection: Sensors that detect along a line. The detection zone of these types of sensors is usually easy to identify; and
• i) Application: Sensors that are grouped by application in a physical detection space.

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