![]() ![]() Since atypical Light Sensor is associated with absorption of photon by the sensing material, almost all the Light Sensors are divided into two types. An Optical Sensor is a device that measures the intensity of light, usually the Electromagnetic Radiation in wavelength range from Ultraviolet to far Infrared. Optical Sensors are also called as Light Sensors or Photo Sensors. What are Optical Sensors (Light Sensors)? but the sensor of interest for this discussion are Optical Sensors. There are many varieties and Types of Sensors like Temperature Sensor, Pressure Sensor, Humidity Sensor etc. a Sensor is an energy converter as irrespective of the quantity being measured, input energy is converted to electrical energy. The above definition of a Sensor can lead to another interpretation of Sensor i.e. but the output is an electrical signal like voltage, current or even charge that can processed, amplifies, channelled and modified by electronic circuits and devices. The input of a sensor can be ay physical quantity like Light, Sound, Temperature etc. Darkness Operated Relay using Phototransistorīefore going into the details of Phototransistors, let us refresh our understanding of Sensors and in particular, Optical Sensors.įrom the perspective of an Electronics Engineers, a Sensor is a device that responds to a physical phenomenon or property with an electrical signal.Light Operated Relay using Phototransistor. ![]() Example Circuits using Phototransistors.What are Optical Sensors (Light Sensors)?. ![]()
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