The photodiode is a p-n junction diode that converts light energy into electrical energy. It is also known as a photodetector, photosensor or light detector. Working A photodiode always works in reverse biased condition. That is the n region of the semiconductor is connected to the battery’s positive terminal and the p region of the …
A photovoltaic cell is a device that generates an electric current when exposed to light. The basic principle behind its working is the photovoltaic effect. Construction Layers – Conducting material on top surface and backside collects produced electricity. The material on the top doesn’t cover the surface fully to allow penetration of radiation to the …
A light dependent resistor(LDR) is used to detect the presence or level of light. They work on the basic principle of photo-conductivity. It is also called a photoresistor, photoconductor or photocell. The circuit symbol of an LDR is shown in the figure. LDR consist of a resistor made up of semiconductor material. Cadmium sulphide and …
Radiation is the emission of energy from matter in the form of rays or high-speed particles. Broadly, it can be thought of as either electromagnetic radiation (like radio waves or visible light) or particle radiation (like alpha particles or beta particles). Radiation Sensors or Radiation Detectors are devices that can sense and measure radiation. The …
Definition of Sensors A sensor or transducer is a device that gives a usable output (preferably, an electrical quantity) in response to a specified measurand (physical quantity such as light, sound, temperature…etc) Daily life examples of sensors include microphones, thermometer, accelerometers, infrared sensors, speakers…etc Sensor produces a usable output in response to a specified quantity. …
Introduction to Sensors and Transducers. Definition and Principle of Transduction Read More »
