Polytec Gmbh

Alexander Drabenstedt

Christian Rembe

Matthias Schussler

Sebastian Boedecker

Thian-Hua Xu

Georg Siegmund

Volkmar Roth

Wanja Ochs

Michael Wortge

Tobias Braun

Robert Kowarsch

Christian Ehrmann

A device for the interferometric measuring of an object, including a light source to generate an emitted beam, a beam splitting device for splitting the emitted beam into a measuring beam and at least first and second reference beams, an optic interference device, and first and second detectors, with the interference device and the first detector being embodied cooperating such that the measuring beam, at least partially reflected by the object, and the first reference beam are interfered on at least one detector area of the first detector. The interference device and the second detector are embodied cooperating such that the measuring beam, at least partially scattered by the object, and the second reference beam are interfered on at least one detector area of the second detector. A method is also provided for the interferometric measuring of an object.

Interferometric measuring device with detectors set at different angular ranges

A device for the interferometric measuring of an object, including a source to generate a source beam, a beam splitting device to split the source beam into a measuring beam and a reference beam, an optic interference device and a first detector, which cooperate such that the measuring beam reflected by the object at least partially is at least partially interfered as the receiver beam and the reference beam on a detector area of the first detector. The beam splitting device splits the source beam into a measuring beam, a first partial reference beam, and at least one second partial reference beam. There is at least one second detector embodied such that the first receiver beam is interfered with the first partial reference beam on a detection area of the first detector and the second partial receiver beam with a second partial reference beam on a detection area of the second detector, each with the formation of an optic interference. An assessment unit assesses the measuring signals of the detectors according to the principle of the reception diversity.

Device and method for an interferometric measuring of an object

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

Method and device for the optical non-contact oscillation measurement of an oscillating object

An optical interferometer including an output-beam beam input for coupling-in an output beam, and a beam splitter device for splitting the output beam into at least one first sub-beam and one second sub-beam, the interferometer being embodied as a heterodyne interferometer by virtue of at least one optical frequency shifter being arranged in the beam path of the interferometer and the interferometer including one or more optical waveguide elements, by which optical waveguides are formed, at least between the output-beam beam input, beam splitter device and frequency shifter. The frequency shifter is arranged in the beam path of the first or second sub-beam.

Optical interferometer and vibrometer comprising such an optical interferometer

A device for the optic measuring of an object (), including a signal processing unit () as well as an interferometer with a light source () and with at least one detector (). The interferometer is embodied such that a light beam () created by the light source () is split at least into a working beam () and a reference beam (), with the working beam () impinging the object () and the working beam () is at least partially reflected by the object and interfered with the reference beam () on the detector (). The signal processing unit () is connected to the detector () and includes a vibrometer processing unit (), which detects the motion of the object () from the measuring signals of the detector (). It is essential that the light source () creates light with a coherence length shorter than 1 cm and that the interferometer comprises a device for changing the optic path length (), and the signal processing unit comprises a focus control () controlling a device for changing the optic path length which controls the device for changing the optic path length such that the optic path length of the working beam and the reference beam are approximately adjusted to each other.

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Ettlingen, Germany

Alexander Drabenstedt