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Multi-beam heterodyne laser doppler vibrometer

  • US 6,972,846 B2
  • Filed: 03/31/2003
  • Issued: 12/06/2005
  • Est. Priority Date: 03/31/2003
  • Status: Active Grant
First Claim
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1. A multi-beam heterodyne vibrometer for analyzing vibration of an object, the vibrometer comprising:

  • an optical system for;

    generating a plurality of object beams and a plurality of frequency-shifted reference beams, the plurality of frequency-shifted reference beams having a frequency that is shifted from a frequency of the plurality of object beams;

    transmitting the object beams to the object, a portion of each of the object beams being reflected off of the object as a modulated object beam; and

    collecting the modulated object beams; and

    a combining element for combining each of the modulated object beams with a respective one of the frequency-shifted reference beams into a plurality of beam pairs.

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