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2. Fotomat - Wikipedia

   en.wikipedia.org/wiki/Fotomat

   Fotomat was an American retail chain of photo development drive-through kiosks located primarily in shopping center parking lots. Fotomat Corporation was founded by Preston Fleet in San Diego, California, in the 1960s, with the first kiosk opening in Point Loma, California, in 1965.

3. 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 ...

4. Photoelectric sensor - Wikipedia

   en.wikipedia.org/wiki/Photoelectric_sensor

   Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.

5. Photoresistor - Wikipedia

   en.wikipedia.org/wiki/Photoresistor

   Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor.The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction.

6. Phototube - Wikipedia

   en.wikipedia.org/wiki/Phototube

   A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from photovoltaic or photoconductive cells. Phototubes were previously more widely used but are now replaced in many applications by solid state photodetectors.

7. Photodiode - Wikipedia

   en.wikipedia.org/wiki/Photodiode

   A photodiode is often combined into a single component with an emitter of light, usually a light-emitting diode (LED), either to detect the presence of a mechanical obstruction to the beam (slotted optical switch) or to couple two digital or analog circuits while maintaining extremely high electrical isolation between them, often for safety ...