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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 15 — Jul. 23, 2007
  • pp: 9157–9165

Quantification of optical Doppler broadening and optical path lengths of multiply scattered light by phase modulated low coherence interferometry

B. Varghese, V. Rajan, T. G. van Leeuwen, and W. Steenbergen  »View Author Affiliations

Optics Express, Vol. 15, Issue 15, pp. 9157-9165 (2007)

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We show experimental validation of a novel technique to measure optical path length distributions and path length resolved Doppler broadening in turbid media for different reduced scattering coefficients and anisotropies. The technique involves a phase modulated low coherence Mach-Zehnder interferometer, with separate fibers for illumination and detection. Water suspensions of Polystyrene microspheres with high scattering and low absorption levels are used as calibrated scattering phantoms. The path length dependent diffusion broadening or Doppler broadening of scattered light is shown to agree with Diffusive Wave Spectroscopy within 5%. The optical path lengths are determined experimentally from the zero order moment of the phase modulation peak around the modulation frequency in the power spectrum and the results are validated with Monte Carlo simulations.

© 2007 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(170.3340) Medical optics and biotechnology : Laser Doppler velocimetry
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(170.4580) Medical optics and biotechnology : Optical diagnostics for medicine

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: March 22, 2007
Revised Manuscript: July 5, 2007
Manuscript Accepted: July 9, 2007
Published: July 11, 2007

Virtual Issues
Vol. 2, Iss. 8 Virtual Journal for Biomedical Optics

B. Varghese, V. Rajan, T. G. van Leeuwen, and W. Steenbergen, "Quantification of optical Doppler broadening and optical path lengths of multiply scattered light by phase modulated low coherence interferometry," Opt. Express 15, 9157-9165 (2007)

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