Photodiodes are used in many different types of circuits and applications. the p – side of the photodiode is connected with negative terminal of battery (or the power supply) and n – side to the positive terminal of battery. Here are a few examples of where photodiodes have been used. Given figure shows the use of photo-diode in an alarm system. There is a wide range of use of photodiodes and found in most of the devices: Photodiode used as a light sensor. In this article, we'll discuss some different types of photodiode technologies and the strengths and disadvantages of the semiconductors used to create them—namely silicon. Alarm circuit using photodiode. We can use the photodiode in smoke detectors to sense smoke and fire. How to use Photodiode: When it comes to using a Photodiode, one important thing to remember is that Photodiode should always be connected in reverse polarity. This video explains the diode in a forward and a reverse bias. Silicon photodiodes are utilized in such diverse applications as spectroscopy, Silicon photodiodes are semiconductor devices responsive to high-energy particles and photons. Photodiodes can be used … This series of webpages will explore all of this. Answered by | 4th Jun, 2014, 03:23: PM. The light source is used apply light to fall on a photo-diode fitted in the doorway. It is also called as Photodetector, photo sensor or light detector. Photodiodes can be used to detect the presence or absence of minute quantities of light and can be calibrated for extremely accurate measurements from intensities below 1 pW/cm 2to intensities above 100 mW/cm. As the current in it is directly proportional to the intensity of light thus also used to measure the intensity of light. Related Videos. Diode V-I characteristics Diode as a rectifier Special purpose diodes. Photo diode operates in reverse bias condition i.e. A photodiode is a type of light detector that converts light into voltage or current, based on the mode of operation of the device. Silicon photodiodes are utilized in such … The reverse current is maximum till the light beam is not broken. That is the Anode will be connected towards the ground and the cathode will be connected to supply voltage. Photodiodes can be used to detect the presence or absence of minute quantities of light and can be calibrated for extremely accurate measurements from intensities below 1 pW/cm2 to intensities above 100 mW/cm2. The photo diode accepts light energy as input to generate electric current. The photodiode can be used as a photo detector to detect optical signals. (i) Alarm circuit using Photodiode. This is the fourth part of our series in photodiodes, which will prepare you for learning more about the use of photodiodes in light-sensitive circuits and their applications. 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