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How a laser measuring system works

A laser beam collimated to infinity with very small beam divergence operates inside the GEPARD™ transmitter. This means that the laser beam diameter also remains constant over large distances. The laser beam is used as a highly stable straightness reference (similar to an alignment line). In this capacity, the laser beam is set up in parallel alignment to the test object.

Functioning principle: How a laser measuring system works
Functioning principle: How a laser measuring system works

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.