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

Babu Varghese, Vinayakrishnan Rajan, Ton van Leeuwen, Wiendelt Steenbergen

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Abstract

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.
Original languageEnglish
Pages (from-to)9157-9165
Number of pages9
JournalOptics express
Volume15
Issue number15
DOIs
Publication statusPublished - 2007

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optical paths
interferometry
scattering coefficients
Mach-Zehnder interferometers
scattering
phase modulation
frequency modulation
power spectra
polystyrene
illumination
moments
anisotropy
fibers
water
spectroscopy
simulation

Cite this

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title = "Quantification of Optical Doppler broadening and optical path lengths of multiply scattered light with phase modulated low coherence interferometry",
abstract = "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.",
author = "Babu Varghese and Vinayakrishnan Rajan and {van Leeuwen}, Ton and Wiendelt Steenbergen",
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Quantification of Optical Doppler broadening and optical path lengths of multiply scattered light with phase modulated low coherence interferometry. / Varghese, Babu; Rajan, Vinayakrishnan; van Leeuwen, Ton; Steenbergen, Wiendelt.

In: Optics express, Vol. 15, No. 15, 2007, p. 9157-9165.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Quantification of Optical Doppler broadening and optical path lengths of multiply scattered light with phase modulated low coherence interferometry

AU - Varghese, Babu

AU - Rajan, Vinayakrishnan

AU - van Leeuwen, Ton

AU - Steenbergen, Wiendelt

PY - 2007

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AB - 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.

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DO - 10.1364/OE.15.009157

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