- Proximity sensor
A proximity sensor is a
sensorable to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagneticor electrostaticfield, or a beam of electromagnetic radiation( infrared, for instance), and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor's target. Different proximity sensor targets demand different sensors. For example, a capacitiveor photoelectricsensor might be suitable for a plastic target; an inductive proximity sensor requires a metal target.
The maximum distance that this sensor can detect is defined "nominal range". Some sensors have adjustments of the nominal range or means to report a graduated detection distance.
Proximity sensors can have a high reliability and long functional life because of the absence of mechanical parts and lack of physical contact between sensor and the sensed object.
IEC 60947-5-2 defines the technical details of proximity sensors.
A proximity sensor adjusted to a very short range is often used as a
Dealing with output from a proximity sensor
Conditioning the output of a proximity sensor is frequently difficult. Proximity sensor designers must confront
linearity, hysteresis, excitation voltage instability, and voltage offset.
Types of sensors
Sonar(typically active or passive)
Doppler effect(effect not a sensor)
*Passive thermal infrared
*Passive optical (such as
*Reflection of ionising radiation
*Car bumpers that sense distance to nearby cars for parking
Ground proximity warning systemfor aviation safety
Wikimedia Foundation. 2010.
Look at other dictionaries:
proximity fuze — ☆ proximity fuze n. an electronic fuze that detonates a bomb, missile, etc. when its sensor detects the target … English World dictionary
proximity fuze — a design for detonating a charge, as in a projectile, within a predesignated radius of a target. Also called variable time fuze, VT fuze. [1940 45] * * * also called Vt Fuze, or Influence Fuze, an explosive ignition device used in bombs … Universalium
proximity — noun closeness; the state of being near as in space, time, or relationship. The proximity of the heat source allowed it to be detected by the sensor. Syn: closeness, nearness See Also: approxim … Wiktionary
Position sensor — A position sensor is any device that enables position measurement. It can either be an absolute position sensor or a relative one (displacement sensor). Position sensors can be either linear or angular.Some position sensors available today: *… … Wikipedia
Magnetic proximity fuze — A Magnetic proximity fuze was patented by P.J. Eliomarkakis, (United States Patent US2434551 of January 13, 1948)  although similar devices had been in service for nearly a decade. It is a type of proximity fuze that initiates a detonator in a … Wikipedia
Inductive sensor — An inductive sensor is an electronic proximity sensor, which detects metallic objects without touching them. The sensor consists of an induction loop. Electric current generates a magnetic field, which collapses generating a current that falls… … Wikipedia
Photoelectric sensor — A photoelectric sensor, or photoeye, is a device used to detect the presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are used extensively in industrial manufacturing.There are three different… … Wikipedia
Hall effect sensor — A Hall effect sensor is a transducer that varies its output voltage in response to changes in magnetic field. Hall sensors are used for proximity switching, positioning, speed detection, and current sensing applications.In its simplest form, the… … Wikipedia
Ground proximity warning system — (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. Another common name for such a system is ground collision warning system (GCWS). Commercial aircraft The system… … Wikipedia
PSTF — • Proximity Sensor Test Facility ( > IEEE Standard Dictionary ) • Payload Spin Test Facility ( > IEEE Standard Dictionary ) … Acronyms