Thursday, 7 November 2013

Proximity Detector

Based on a simple basic idea, this infrared proximity detector is easy to build, easy to calibrate and still, it provides a detection range of about 10 cm. This range can change depending on the ambient light intensity. Thus, the circuit is extremely easy and can be used for most indoor applications.

A Proximity Detector is a sensor able to detect the presence of nearby objects without any physical contact. A proximity detector often emits a beam of infrared, and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor’s target. The maximum distance that this sensor can detect is defined as “nominal range”.


Proximity sensor has a high reliability and long functional life because of the absence of mechanical parts and lack of physical contact between the sensor and the sensed object. Proximity sensors are also used in machine vibration monitoring to measure the variation in distance between a shaft and its support bearing.

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