Analog Sensing

Standard linear inductive proximity sensors are not always adequate, especially for applications where the sensor must detect the shape and size of an object. Detecting a rotary cam position is an example of such an application. Proximity sensors are fine for detecting the presence of an object, but they do not distinguish between shapes and sizes. The article explains that if an inductive linear analog sensor is used instead, an analog output will be produced that is proportional to the distance to the target. Standard proximity sensors just have an on-or-off signal as the target moves in and out of range. The difference in this output allows the analog sensor to distinguish targets that are odd shapes or in close proximity. They also perform well in vision systems that require repeatability. Analog sensors come in a variety of shapes and sizes to that should be selected to best fit the application for which it will be used. Multiple analog sensors can be positioned in various configurations to ensure targets are properly centered or determine the thickness of a target.