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A sensor is a device that measures a physical quantity and converts it into a signal (current/voltage) which can be read by an observer or by an instrument such as voltammeter or an ammeter. It’s a very tiny device that can basically do a main thing (detection). Sensors comes in many shapes and sizes that can be suitable to the design used in. It plays as one of the main items in the system. In addition, its very useful to outcome with perfect innovations.
Sensor's sensitivity indicates how much the sensor's output changes when the measured quantity changes. For instance, if the mercury in a thermometer moves 1 cm when the temperature changes by 1 °C, the sensitivity is 1 cm/°C. Sensors that measure very small changes must have very high sensitivities.
Principle of sensors
Complicated components integrated in a very small chip implements a sensor that can be easily and smoothly used by the people in different fields to do different jobs. A very simple example on the sensors can be discussed is the thermometer. A mercury thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. A thermocouple converts temperature to an output voltage which can be read by a voltmeter.
Sensors are used in everyday objects such as touch-sensitive elevator buttons and lamps which dim or brighten by touching the base. There are also countless applications for sensors of which most people are never aware. Applications include cars, machines, aerospace, medicine, manufacturing and robotics.Sensors can be used widely in many different applications. Detection sensor can detect if something has touched it, for instance. A sensor under a bed post could detect if someone is tossing and turning. A sensor on a door could detect if the door had been opened. A sensor under a medicine bottle could detect that someone picked up and put down...