1. A system comprising: a first laser module for projecting lines across a detector surface area, the laser module being housed in a housing unit; a first image sensor, the image sensor configured to capture an image of projected lines from the laser module; a control processor coupled to the image sensor, the control processor configured to calibrate a test image and evaluate the captured image based on the test image: and a motion control unit coupled to the control processor, the motion control unit configured to adjust position of a detector with respect to an object in response to determination by the control processor of whether the captured image is obstructed.