Pls any one say me about wt type of sensors used in detecting a boundary range....pls answer plz

sensor which able to detect the presence of nearby objects without any physical contact known as proximity sensor.

Growth of the proximity sensor is mainly bound to various macro-economic and micro-economic factors. As demand for detecting the surrounding objects and obstructions in the route increases, manufacturers increasingly integrate the proximity sensors in the vehicles. Bound to features such as ultrasound and electromagnetic features, the manufacturers are increasingly integrating proximity sensors in vehicles. These sensors enable indicate the presence of obstruction and helps them prevent accidents or collisions. These factors are projected to impact the industry growth of proximity sensors positively.

Adoption of the proximity sensors also extend to the aviation industry. With the growing need to prevent collisions while flying has led to a surge in demand for equipping the commercial aircrafts with proximity sensors.

With the emerging medical technology, manufacturers in the healthcare industry are also integrating medical devices with sensor systems. Equipped with features such as pulse oximetry, integration of the proximity sensors enable the medical devices to perform photoplethysmography procedure in order to check the pulse rate. Manufacturers in the healthcare industry are also witnessed to embed proximity sensors in other medical devices such as ECG/KCG monitors, glucose monitors and blood pressure monitors. These factors are projected to impact the global market growth of proximity sensors positively.