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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 28 — Oct. 1, 2006
  • pp: 7264–7268

Self-mixing differential vibrometer based on electronic channel subtraction

Silvano Donati, Michele Norgia, and Guido Giuliani  »View Author Affiliations

Applied Optics, Vol. 45, Issue 28, pp. 7264-7268 (2006)

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An instrument for noncontact measurement of differential vibrations is developed, based on the self-mixing interferometer. As no reference arm is available in the self-mixing configuration, the differential mode is obtained by electronic subtraction of signals from two (nominally equal) vibrometer channels, taking advantage that channels are servo stabilized and thus insensitive to speckle and other sources of amplitude fluctuation. We show that electronic subtraction is nearly as effective as field superposition. Common-mode suppression is 25 30 dB , the dynamic range (amplitude) is in excess of 100 μm , and the minimum measurable (differential) amplitude is 20 nm on a B = 10 kHz bandwidth. The instrument has been used to measure vibrations of two metal samples kept in contact, revealing the hysteresis cycle in the microslip and gross-slip regimes, which are of interest in the study of friction induced vibration damping of gas turbine blades for aircraft applications.

© 2006 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(280.3420) Remote sensing and sensors : Laser sensors

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: November 4, 2005
Revised Manuscript: February 20, 2006
Manuscript Accepted: April 28, 2006

Silvano Donati, Michele Norgia, and Guido Giuliani, "Self-mixing differential vibrometer based on electronic channel subtraction," Appl. Opt. 45, 7264-7268 (2006)

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  1. S. Donati, Electro-Optical Instrumentation--Sensing and Measuring with Lasers (Prentice Hall, 2004).
  2. G. Giuliani, M. Norgia, S. Donati, and T. Bosch, "Laser diode self-mixing technique for sensing applications," J. Opt. A 4, S283-S294 (2002). [CrossRef]
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