Abstract: A method for interferometric vibration measurement at a plurality of measurement points using a measuring laser beam, including A. generating the measuring laser beam having a wavelength in the infrared wavelength range and a pilot laser beam having a wavelength in the visible wavelength range; B. deflecting the measuring laser beam and the pilot, laser beam by a common optical deflection unit, and controlling the deflection unit such that the pilot laser beam is incident on the measurement point; and C. carrying out a vibration measurement using the measuring laser beam. An angular deviation between the pilot laser beam and the measuring laser beam is determined and, in a correction step B 1, between method step B and C, the deflection unit is actuated in order to compensate for the angular deviation between the pilot laser beam and the measuring laser beam.

Abstract: A device for the optical non-contact vibration measurement of an vibrating object, including a laser Doppler vibrometer that has a laser (1) as the light source for a laser beam, a first beam splitter assembly (S1) for splitting the laser beam into a measuring beam (2) and a reference beam (3), a means (4) for shifting the frequency of the reference beam (3) or of the measuring beam (2) in a defined manner, a second beam splitter assembly (S2, S3) by which the measuring beam (2) back-scattered by the oscillating object (6) is merged with the reference beam (3) and superimposed on the same, and a detector (5) for receiving the superimposed measuring and reference beam (7) and for generating a measurement signal. The laser (1) is provided with a polarization filter arranged inside the optical resonator of the laser and the laser (1) is frequency stabilized by regulating to a beat signal of the laser.

Abstract: A method and a device for non-contact vibration measurement of an object. Method steps include: Moving at least one laser interferometer, which emits at least one measuring beam to at least one measuring point on the object, detecting the measuring beam reflected by the object, determining the vibration data from the emitted and reflected measuring beam, allocating the vibration data to the measuring point, as well as evaluating the vibration data and displaying the vibration data of the measuring point, with at least one comparison of a position of the laser interferometer being performed using at least one position of a known freely predetermined point on the object and a transformation rule being prepared to determine the position of the laser interferometer in reference to the object for arbitrary measuring positions based on the comparison. The device for measuring vibrations is also disclosed.

Abstract: A method and a device to measure oscillations of an object.

Abstract: A method and an apparatus are provided for contact-free optical displacement and/or vibration measurement of an object, in which the actual positions of the plurality of measurement points are selected and recorded. The display positions of the plurality of measurement points are displayed in the output unit based on a stored or video image of the object. Errors in congruency between the actual positions of the plurality of measurement points and the display positions of the plurality of measurement points are corrected.

Abstract: A method and an apparatus are provided for contact-free optical displacement and/or vibration measurement of an object, in which the object to be measured is scanned in the form of a grid. The position of the measurement points and the contour of the grid are freely selectable. Individual measurement point subquantities, to be analyzed respectively in correlation with one another, can be classified in different categories and analyzed as a function of the category to which they are assigned.