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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. List of sensors - Wikipedia

   en.wikipedia.org/wiki/List_of_sensors

   Atomic Gravitational Wave Interferometric Sensor Attitude control (spacecraft) : Horizon sensor , Earth sensor , Moon sensor , Satellite Sensor , Sun sensor Catadioptric sensor

4. Touch switch - Wikipedia

   en.wikipedia.org/wiki/Touch_switch

   A touch switch is a type of switch that only has to be touched by an object to operate. It is used in many lamps and wall switches that have a metal exterior as well as on public computer terminals. A touchscreen includes an array of touch switches on a display. A touch switch is the simplest kind of tactile sensor.

5. Tactile sensor - Wikipedia

   en.wikipedia.org/wiki/Tactile_sensor

   A tactile sensor is a device that measures information arising from physical interaction with its environment. Tactile sensors are generally modeled after the biological sense of cutaneous touch which is capable of detecting stimuli resulting from mechanical stimulation, temperature, and pain (although pain sensing is not common in artificial ...

6. Photodetector - Wikipedia

   en.wikipedia.org/wiki/Photodetector

   Photoemission or photoelectric effect: Photons cause electrons to transition from the conduction band of a material to free electrons in a vacuum or gas. Thermal: Photons cause electrons to transition to mid-gap states then decay back to lower bands, inducing phonon generation and thus heat.

7. Touch-sensitive lamp - Wikipedia

   en.wikipedia.org/wiki/Touch-sensitive_lamp

   Video demonstrating the operation of a touch-sensitive lamp. A touch-sensitive lamp is a combination of a lamp and a touch switch. They act on the principle of body capacitance, activated by human touch rather than a flip, push-button, or other mechanical switch. They are popular as desk and nightstand lamps. Touch-sensitive lamp switches may ...