Onlytronix

  A PN junction is a device formed when an N-type semiconductor material is joined with a P-type semiconductor material. The N-type material has an excess of free electrons, while the P-type material has an excess of holes. However, both materials are electrically neutral because the excess of free electrons and holes is balanced by the number of positive and negative ions, respectively. When N-type material is joined to P-type material, the electrons in the N material diffuse across the junction into the P material and fill some of the holes, while the holes in th   e P material diffuse across the junction into the N material and are filled by N material electrons. This process is called junction recombination and it reduces the number of free electrons and holes in the vicinity of the junction. Because there is a depletion, or lack of free electrons and holes in this area, it is known as the depletion region. The diffusion of electrons and holes across the junction will c...

   we’ll be discussing the basics of infrared sensors, how they work, and their applications. Chapter 1: Introduction to Infrared Sensors ·        What is an infrared sensor? An infrared (IR) sensor is an electronic device used to measure and detect infrared radiation in its surrounding environment An IR sensor can measure the heat of an object as well as detects the motion . ·        How does an infrared sensor work? An IR sensor can detect changes in the amount of infrared radiation impinging upon it, which varies depending on the temperature and surface characteristics of the objects in front of the sensor . These types of radiations are invisible to our eyes, which can be detected by an infrared sensor. The emitter is merely an infrared LED (Light Emitting Diode), and the detector is simply an infrared photodiode sensitive to infrared light of the same wavelength as the IR LED. When infrared light strikes...