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Diodes Part II

This mobile studio project conducted at Rensselaer Polytechnic Institute provides an analysis and outline of LED as an optical transmitter and the use of a photodiode or phototransistor as a detector. It explores the applications of optical transmitters/receivers, including digital communications and analog signal modulation. The project also examines various optical receiver options and their responses to transmitted light pulses. Additionally, it delves into the applications of opto-isolators, fiber optic communication, IR remote applications, and sensors.

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Diodes Part II

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  1. Diodes Part II K. A. Connor Mobile Studio Project Center for Mobile Hands-On STEM SMART LIGHTING Engineering Research Center ECSE Department Rensselaer Polytechnic Institute Intro to ECSE Analysis

  2. Outline • LED as Optical Transmitter • Photodiode or Phototransistor as Detector • Applications

  3. Optical Transmitter/Receiver • LEDs can produce light pulses for digital communications • They can also have their intensity modulated with an analog signal

  4. Optical Receiver • Photodiode I-V curves change in lower left quadrant when exposed to light. • Current produced can be detected.

  5. Optical Receiver • Could use a photocell (variable resistor) • Could use a solar cell • All have their pluses and minuses • In each case observe how the receiver responds to the transmitted light pulse … does high produce low or high, etc?

  6. Applications • Opto-isolators – no directelectrical connection between input and output • Fiber optic communication • IR Remote

  7. Applications • Sensors • And?

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