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  2. Capacitive sensing - Wikipedia

    en.wikipedia.org/wiki/Capacitive_sensing

    Mutual capacitance allows multi-touch operation where multiple fingers, palms or styli can be accurately tracked at the same time. [13] Self-capacitance sensors can have the same X-Y grid as mutual capacitance sensors, but the columns and rows operate independently. With self-capacitance, current senses the capacitive load of a finger on each ...

  3. Proximity sensor - Wikipedia

    en.wikipedia.org/wiki/Proximity_sensor

    An infrared proximity sensor Optical proximity sensor in a 2016 Samsung smartphone.A proximity sensor is a standard feature of most smartphones, disabling the touchscreen when positioned near an ear during phone calls; more recent (late 2019-early 2020) smartphones with OLED displays may have the sensor mounted under the display.

  4. List of sensors - Wikipedia

    en.wikipedia.org/wiki/List_of_sensors

    Wire chamber; Navigation instruments ... Capacitive displacement sensor; Capacitive sensing; ... Proximity sensor; Passive infrared sensor;

  5. Capacitive displacement sensor - Wikipedia

    en.wikipedia.org/wiki/Capacitive_displacement_sensor

    Capacitive displacement sensors can be used to measure the position of objects down to the nanometer level. This type of precise positioning is used in the semiconductor industry where silicon wafers need to be positioned for exposure. Capacitive sensors are also used to pre-focus the electron microscopes used in testing and examining the wafers.

  6. Hall effect sensor - Wikipedia

    en.wikipedia.org/wiki/Hall_effect_sensor

    Hall sensors are used for proximity sensing, positioning, speed detection, and current sensing applications [1] and are common in industrial and consumer applications. Hundreds of millions of Hall sensor integrated circuits (ICs) are sold each year [2] by about 50 manufacturers, with the global market around a billion dollars. [3]

  7. Touch switch - Wikipedia

    en.wikipedia.org/wiki/Touch_switch

    However, mutual capacitance also has its limitations, such as its measurement noise being generally greater than self-capacitance. Capacitance switches are available commercially as integrated circuits from a number of manufacturers. These devices can also be used as a short-range proximity sensor.

  8. Inductive sensor - Wikipedia

    en.wikipedia.org/wiki/Inductive_sensor

    [2] Since the output of an inductive sensor has two possible states, an inductive sensor is sometimes referred to as an inductive proximity switch. [2] [3] The sensor consists of an induction loop or detector coil. Most often this is physically a number of turns of insulated magnet wire wound around a high magnetic permeability core, such as a ...

  9. Induction loop - Wikipedia

    en.wikipedia.org/wiki/Induction_loop

    An induction or inductive loop is an electromagnetic communication or detection system which uses a moving magnet or an alternating current to induce an electric current in a nearby wire. Induction loops are used for transmission and reception of communication signals, or for detection of metal objects in metal detectors or vehicle presence ...