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               Measurements for Wireless Sensor Networks

Measurand

Transduction Principle

Physical Properties

Pressure

Piezoresistive, Capacitive

Temperature

Thermistor, Thermocouple, Thermo-Mechnical

Motion Properties

Position

E-mag, GPS

Velocity

Doppler, Hall effect

Acceleration

Piezoelectric, Optical fiber

Presence

Proximity

Hall effect, Capacitive, Magnetic, Siesmic, Acoustic, RF

Distance/Range

E-mag(sonar,radar,lidar), magnetic

Motion

E-mag, IR, Acoustic

Identification

Personal features

Vision, Physio-Psycological

Personal ID

Fingerprints, Retinal scan, Voice, Vision motion analysis