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  2. Proximity sensor - Wikipedia

    en.wikipedia.org/wiki/Proximity_sensor

    A proximity sensor (often simply prox) is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation ( infrared , for instance), and looks for changes in the field or return signal .

  3. Inductive sensor - Wikipedia

    en.wikipedia.org/wiki/Inductive_sensor

    An inductive sensor is a device that uses the principle of electromagnetic induction to detect or measure objects. An inductor develops a magnetic field when an electric current flows through it; alternatively, a current will flow through a circuit containing an inductor when the magnetic field through it changes.

  4. Parking sensor - Wikipedia

    en.wikipedia.org/wiki/Parking_sensor

    The sensors emit acoustic pulses, with a control unit measuring the return interval of each reflected signal and calculating object distances. [1] The system in turns warns the driver with acoustic tones, the frequency indicating object distance, with faster tones indicating closer proximity and a continuous tone indicating a minimal pre ...

  5. Capacitive sensing - Wikipedia

    en.wikipedia.org/wiki/Capacitive_sensing

    Many types of sensors use capacitive sensing, including sensors to detect and measure proximity, pressure, position and displacement, force, humidity, fluid level, and acceleration. Human interface devices based on capacitive sensing, such as touchpads, [1] can replace the computer mouse.

  6. Proximity - Wikipedia

    en.wikipedia.org/wiki/Proximity

    Proximity, a science fiction drama film; Proximity fuze, a fuze that detonates an explosive device automatically when the distance to the target becomes smaller than a predetermined value; Proximity sensor, a sensor able to detect the presence of nearby objects without any physical contact; Proximity space, or nearness space, in topology

  7. Photoelectric sensor - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_sensor

    Remote photoelectric sensors used for remote sensing contain only the optical components of a sensor. The circuitry for power input, amplification, and output switching is located elsewhere, typically in a control panel. This allows the sensor, itself, to be very small. Also, the controls for the sensor are more accessible, since they may be ...

  8. Moral Injury: The Grunts - The Huffington Post

    projects.huffingtonpost.com/moral-injury/the...

    Can we imagine ourselves back on that awful day in the summer of 2010, in the hot firefight that went on for nine hours? Men frenzied with exhaustion and reckless exuberance, eyes and throats burning from dust and smoke, in a battle that erupted after Taliban insurgents castrated a young boy in the village, knowing his family would summon nearby Marines for help and the Marines would come ...

  9. Bluetooth Low Energy beacon - Wikipedia

    en.wikipedia.org/wiki/Bluetooth_low_energy_beacon

    Bluetooth beacons use Bluetooth Low Energy proximity sensing to transmit a universally unique identifier [1] picked up by a compatible app or operating system. The identifier and several bytes sent with it can be used to determine the device's physical location, [ 2 ] track customers, or trigger a location-based action on the device such as a ...

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