technology gain

Sensor\types of sensors\working principle\Transducers\Actuators\proximity switches(sensors). what is sensors? A   sensor is a device which  converts a physical event into an electrical signal.or  Sensors  are sophisticated devices that are frequently used to detect and respond to electrical or optical signals. working principle Every  sensor  has different  principle  of operation, based on the type of physical quantity it is measuring. The idea is to create a change in the property/properties of  sensor  (such as resistance, density, shape, temperature etc) as a function of the physical quantity under measurement. classification of the sensors  they are divided into two part Active and Passive sensor. active sensor - Active sensors  have its own source of light or illumination. In particular, it actively sends a pulse and measures the backscatter reflected back to the  sensor .EX-  The  radar  is an  active sensor, observation of the Earth's surface and atm