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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 27 — Sep. 20, 2008
  • pp: 4952–4958

Laser Doppler vibrometer employing active frequency feedback

Akobuije Chijioke and John Lawall  »View Author Affiliations

Applied Optics, Vol. 47, Issue 27, pp. 4952-4958 (2008)

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We present a heterodyne Michelson interferometer for vibration measurement in which feedback is used to obviate the need to unwrap phase data. The Doppler shift of a vibrating target mirror is sensed interferometrically and compensated by means of a voltage-controlled oscillator driving an acousto-optic modulator. For frequencies within the servo bandwidth, the oscillator control voltage provides a direct measurement of the target velocity. Outside the servo bandwidth, phase-sensitive detection is used to evaluate high-frequency displacements. This approach is of great interest for the frequently-occurring situation where vibration amplitudes at low frequency exceed an optical wavelength, but knowledge of the vibration spectrum at high frequency is important as well.

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.7250) Instrumentation, measurement, and metrology : Velocimetry

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 20, 2008
Revised Manuscript: July 21, 2008
Manuscript Accepted: August 6, 2008
Published: September 17, 2008

Akobuije Chijioke and John Lawall, "Laser Doppler vibrometer employing active frequency feedback," Appl. Opt. 47, 4952-4958 (2008)

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