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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.
Access badges use various technologies to identify the holder of the badge to an access control system. The most common technologies are magnetic stripe, proximity, barcode, smart cards and various biometric devices. The magnetic stripe ID card was invented by Forrest Parry in 1960. [1] The access badge contains a number that is read by a card ...
The original 125-kilohertz and 400-kilohertz proximity technology had been pioneered by Destron/IDI (formerly Identification Devices Inc.), in Boulder, Colorado, and used primarily for Animal Identification and Proximity Access Control, and to a lesser degree in Manufacturing Processes, Tyre tracking and a few other Asset Identification ...
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 .
A proximity card or prox card [1] also known as a key card or keycard is a contactless smart card which can be read without inserting it into a reader device, as required by earlier magnetic stripe cards such as credit cards and contact type smart cards. [2] The proximity cards are part of the contactless card technologies.
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Radar proximity fuzes are attached to anti-aircraft artillery shells or other explosive devices, and detonate the device when it approaches a large object. They use a small rapidly pulsing omnidirectional radar, usually with a powerful battery that has a long storage life, and a very short operational life.
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 ...