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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 9 — Mar. 20, 2007
  • pp: 1486–1491

Self-mixing interferometry based on a double-modulation technique for absolute distance measurement

Dongmei Guo and Ming Wang  »View Author Affiliations

Applied Optics, Vol. 46, Issue 9, pp. 1486-1491 (2007)

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A new, to the best of our knowledge, method for the measurement of the absolute distance of a remote target based on the laser diode self-mixing interferometry is presented. A double-modulation technique is introduced to improve the measurement resolution. Wavelength modulation of the laser beam is obtained by modulating the injection current of the laser diode. Phase modulation of the laser beam is obtained by an electro-optic crystal in the external cavity. Absolute distance of the external target is determined by the Fourier analysis method. Theoretical analysis and numerical simulations are given. Experimental results show that a resolution of ± 0.3   mm can be achieved for absolute distance ranging from 277 to 477   mm .

© 2007 Optical Society of America

OCIS Codes
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.4630) Instrumentation, measurement, and metrology : Optical inspection
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(150.5670) Machine vision : Range finding

Original Manuscript: May 25, 2006
Revised Manuscript: September 19, 2006
Manuscript Accepted: October 26, 2006
Published: March 1, 2007

Dongmei Guo and Ming Wang, "Self-mixing interferometry based on a double-modulation technique for absolute distance measurement," Appl. Opt. 46, 1486-1491 (2007)

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