Measurement of Physical Parameters
The purpose of a sensor is to record events and changes in the environment and to pass these data to a readable display or further electronic processing. Thus, a sensor is a measurement unit that translates a physical phenomenon, such as pressure or temperature, to a different physical size, usually an electrical current or voltage. In a further developed form also in the form of radio signals.
There are sensors for measuring temperature, pressure, weight, light, sound, motion, radio waves, magnetic fields, pH, gas concentrations, chemical mixtures and much more.
The technological complexity ranges from a traditional barometer with analog presentation of output signals to microsensors integrated into microelectromechanical systems (MEMS).