Abstract: A device for interferometric vibration measurement, having a radiation source for generating an original beam, a first beam splitter for dividing it into measuring and reference beams, a detector and a focusing device. The measuring beam at least partly reflected by the object and the reference beam are superimposed on a detection area of the detector, and the focusing device in the beam path of the measuring beam between the image unit and object focuses it onto a measuring point. Here, a measuring beam having a wavelength greater than 1100 nm is generated and the device has an image unit for two-dimensional imaging of the object surrounding the measuring point. The measuring beam focus lies in the focal plane of the image unit and, by use of the focusing device, the focal point of the measuring beam and the focal plane of the imaging unit are displaceable simultaneously.

Abstract: A device for interferometric vibration measurement on an object (8), having a radiation source (1) for generating an original beam, a first beam splitter for dividing the original beam into a measuring beam and a reference beam (4, 5), a detector (10) and a focusing device (9). The device is implemented in such a way that the measuring beam at least partly reflected by the object and the reference beam are superimposed on a detection area of the detector, and the focusing device is arranged in the beam path of the measuring beam for focusing the measuring beam onto a measuring point (7) on the object. It is important that, by using the device, a measuring beam having a wavelength greater than 1100 nm can be generated and that the device additionally has an image unit (12) for two-dimensional imaging of at least a sub-region of the object surrounding the measuring point.