The laser beam is received by a laser-sensitive position sensing device (PSD), integrated into the task-optimised GEPARD™ receiver casing (cubic or cylindrical), and converted into position-dependent electrical signals. If a two-dimensional PSD is used, the x and y co-ordinates of a test object can be measured simultaneously.
In the receiver, these signals are then converted into digital signals using a microprocessor and processed through various filter algorithms. The processed signals can then be digitally transmitted to an evaluation system. By moving the GEPARD receiver in the z direction along the test object, two 2-dimensional graphs for the x and y planes of the test object are generated.