
Sensor is an object or a device made for a purpose to detect an occurrence of any event or change in the environmental condition and if found, provide a corresponding output. Broadly, Sensor is a transducer which intakes one kind of energy (mostly optical & electrical) to operate & gives different types of output. Today sensors are used in everyday life in every electronic product & with the advancement in technologies, the demand of instrumentation and automation has been increasing over the years and expected to grow further in the upcoming future with highest possible demand. One such product from this category is the distance measurement sensor. As the name itself defines that it is used in detecting or tracing the distance between two objects. In the present days, a sensor with high sensitivity is more preferred, the term sensitivity is used to find out the quality or the accuracy of the sensor. Currently, the distance measurement sensors are the combination of different technologies as ultrasonic, optical, capacitive, inductive and many more, selection of sensors are done as per the requirements which is usually based on the application, need for the accuracy, cost, size, distance of operation and life time. As for the short distance measurement application, proximity sensors are more suitable, LASER distance sensors are used for the application of long distance measurement purpose.