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

US9851243B2 · kind B2 · utility

Assignee

• Polytec GmbH · CA

Inventors

• Christian Rembe · Waldbronn, DE
• Alexander Drabenstedt · Ettlingen, DE
• Matthias Schussler · Waldbronn, DE
• Christian Ehrmann · Merzig, DE
• Volkmar Roth · Karlsruhe, DE

Key dates

• Filing date: Mar 16, 2012
• Grant date: Dec 26, 2017
• Expiry date: Jul 28, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01H9/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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.