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  2. Photoresistor - Wikipedia

    en.wikipedia.org/wiki/Photoresistor

    In the dark, a photoresistor can have a resistance as high as several megaohms (MΩ), while in the light, it can have a resistance as low as a few hundred ohms. If incident light on a photoresistor exceeds a certain frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band.

  3. Opto-isolator - Wikipedia

    en.wikipedia.org/wiki/Opto-isolator

    Schematic diagram of an opto-isolator showing source of light (LED) on the left, dielectric barrier in the center, and sensor (phototransistor) on the right [note 1]. An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light. [1]

  4. Resistive opto-isolator - Wikipedia

    en.wikipedia.org/wiki/Resistive_opto-isolator

    Opto-isolator VTL2C1 with LED input and photoresistor output. Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator [notes 1] or lamp-coupled photocell, [1] is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically ...

  5. Optoelectronics - Wikipedia

    en.wikipedia.org/wiki/Optoelectronics

    Electronic light sensors. Optoelectronics (or optronics) is the study and application of electronic devices and systems that find, detect and control light, usually considered a sub-field of photonics.

  6. Ambient light sensor - Wikipedia

    en.wikipedia.org/wiki/Ambient_light_sensor

    The ambient light sensor of a Google Pixel 4a smartphone under a microscope. An ambient light sensor is a component in smartphones, notebooks, other mobile devices, automotive displays and LCD TVs.

  7. Photodetector - Wikipedia

    en.wikipedia.org/wiki/Photodetector

    A photodetector salvaged from a CD-ROM drive.The photodetector contains three photodiodes, visible in the photo (in center).. Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. [1]

  8. Optical wireless communications - Wikipedia

    en.wikipedia.org/wiki/Optical_Wireless...

    Optical wireless communications (OWC) is a form of optical communication in which unguided light is used "in the air" (or in outer space), without an optical fiber. Visible , infrared (IR), or ultraviolet (UV) light is used to carry a wireless signal.

  9. Charge-coupled device - Wikipedia

    en.wikipedia.org/wiki/Charge-coupled_device

    In a CCD image sensor, pixels are represented by p-doped metal–oxide–semiconductor (MOS) capacitors.These MOS capacitors, the basic building blocks of a CCD, [1] are biased above the threshold for inversion when image acquisition begins, allowing the conversion of incoming photons into electron charges at the semiconductor-oxide interface; the CCD is then used to read out these charges.