Vibrometer and method for optically measuring an object

摘要

The vibrometer has a beam splitter (5a) for splitting a source beam (8) into a measuring beam (9) and a reference beam (10). The beam splitter and a frequency shifting device are designed as an acousto-optic modulator e.g. Bragg cell (2), in an optic component to deflect the beam (8). The modulator is designed such that the beam (8) entering the modulator is split into two diffraction beams of different orders. The modulator is arranged in an optical path of the vibrometer such that one of the diffraction beams is the beam (9) and the other of the diffraction beams is the beam (10). An independent claim is also included for a method for optically measuring an object.