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2. Photoelectric sensor - Wikipedia

   en.wikipedia.org/wiki/Photoelectric_sensor

   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. They are largely used in industrial manufacturing. There are three different useful types: opposed (through-beam), retro-reflective, and proximity-sensing (diffused).

3. Retroreflector - Wikipedia

   en.wikipedia.org/wiki/Retroreflector

   In common (non-SLR) digital cameras, the sensor system is often retroreflective. Researchers have used this property to demonstrate a system to prevent unauthorized photographs by detecting digital cameras and beaming a highly focused beam of light into the lens. [26] In movie screens to allow for high brilliance under dark conditions. [27]

4. Electro-optical sensor - Wikipedia

   en.wikipedia.org/wiki/Electro-optical_sensor

   Optical heart-rate sensor. Electro-optical sensors are used whenever light needs to be converted to energy. Because of this, electro-optical sensors can be seen almost anywhere. Common applications are smartphones where sensors are used to adjust screen brightness, and smartwatches in which sensors are used to measure the wearer's heartbeat.

5. Presence sensing device - Wikipedia

   en.wikipedia.org/wiki/Presence_Sensing_Device

   One category of presence sensing devices is Photoelectric Sensors. Light Curtains also fall into this category. Light curtains use many infrared light beams to form a perimeter around machinery. When two or more consecutively adjacent beams are interrupted, a kill-switch stops the machine until the boundary is reset.

6. Modulating retro-reflector - Wikipedia

   en.wikipedia.org/wiki/Modulating_retro-reflector

   A modulating retro-reflector (MRR) system combines an optical retro-reflector and an optical modulator to allow optical communications [1] and sometimes other functions such as programmable signage. [2] Free space optical communication technology has emerged in recent years as an attractive alternative to the conventional radio frequency (RF ...

7. Retroreflective sheeting - Wikipedia

   en.wikipedia.org/wiki/Retroreflective_sheeting

   Flash photo of car with reflective stickers Flash photo of moped with retroreflective sheeting tape Retroreflective sheeting is flexible retroreflective material primarily used to increase the nighttime conspicuity of traffic signs , high-visibility clothing , and other items so they are safely and effectively visible in the light of an ...

8. Spatial light modulator - Wikipedia

   en.wikipedia.org/wiki/Spatial_light_modulator

   Spatial light modulators can be either reflective or transmissive depending on their design and purpose. [4] DMDs, short for digital micromirror devices, are spatial light modulators that specifically work with binary amplitude-only modulation. [5] [6] Each pixel on the SLM can only be in one of two states: "on" or "off". The main purpose of ...

9. Corner reflector - Wikipedia

   en.wikipedia.org/wiki/Corner_reflector

   A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat reflective surfaces. It reflects waves incident from any direction directly towards the source, but translated. The three intersecting surfaces often are triangles (forming a tetrahedron) or may have square shapes.