Different Sensors


A sensor is often defined as a device that receives and responds to a signal or stimulus.

     This world is divided into natural and man-made objects. The natural sensors, like those found in living organisms, usually respond with signals, having an electro-chemical character; that is, their physical nature is based on ion transport, like in the nerve fibers (such as an optic nerve in the fluid tank operator). In man-made devices, information is also transmitted and processed in electrical form—however, through the transport of electrons. Sensors that are used in artificial systems must speak the same language as the devices with which they are interfaced. This language is electri-cal in its nature and a man-made sensor should be capable of responding with signals where information is carried by displacement of electrons, rather than ions.1 Thus, it should be possible to connect a sensor to an electronic system through electrical wires, rather than through an electrochemical solution or a nerve fiber. Hence, in this book, we use a somewhat narrower definition of sensors, which may be phrased as A sensor is a device that receives a stimulus and responds with an electrical signal.

Different types of sensors
  •   Fire sensor
  •  Speed sensor
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