Closed loop sensor system for automated machines

The exact position in space of the end effecter or tool head cannot be not sensed directly in many automated machines. These machines operate under overall ´open loop´ control as the software controlling the machine makes a calculated estimate of where the tool head should be. This is done by sensors on axes that track linear translation and rotations of shafts/gears. For low precision applications this system is appropriate. However positional errors can occur and accumulate. There exists a need for a sensor system that is capable of acquiring the exact spatial coordinates of the tool point or end effector directly.