High angle phase modulated low coherence interferometry for path length resolved Doppler measurements of multiply scattered light

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

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

We describe an improved method for coherence domain path length resolved measurements of multiply scattered photons in turbid media. An electro-optic phase modulator sinusoidally modulates the phase in the reference arm of a low coherence fiber optic Mach–Zehnder interferometer, at a high phase modulation angle. For dynamic turbid media this results in Doppler broadened phase modulation interference peaks at the modulation frequency and its multiples. The signal to noise ratio is increased by almost one order or magnitude for large modulation angles and the shape of the spectral peaks resulting from the interference of Doppler shifted sample waves and reference light is not changed. The path length dependent Doppler broadening is compared with the theoretical predictions in the single scattered and diffusive regimes. The experimentally measured optical path lengths are validated with the Monte Carlo technique.
Original languageUndefined
Pages (from-to)494-498
Number of pages5
JournalOptics communications
Volume281
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • IR-76413
  • METIS-243135

Cite this

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title = "High angle phase modulated low coherence interferometry for path length resolved Doppler measurements of multiply scattered light",
abstract = "We describe an improved method for coherence domain path length resolved measurements of multiply scattered photons in turbid media. An electro-optic phase modulator sinusoidally modulates the phase in the reference arm of a low coherence fiber optic Mach–Zehnder interferometer, at a high phase modulation angle. For dynamic turbid media this results in Doppler broadened phase modulation interference peaks at the modulation frequency and its multiples. The signal to noise ratio is increased by almost one order or magnitude for large modulation angles and the shape of the spectral peaks resulting from the interference of Doppler shifted sample waves and reference light is not changed. The path length dependent Doppler broadening is compared with the theoretical predictions in the single scattered and diffusive regimes. The experimentally measured optical path lengths are validated with the Monte Carlo technique.",
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author = "Babu Varghese and Vinayakrishnan Rajan and {van Leeuwen}, Ton and Wiendelt Steenbergen",
year = "2008",
doi = "10.1016/j.optcom.2007.09.050",
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pages = "494--498",
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High angle phase modulated low coherence interferometry for path length resolved Doppler measurements of multiply scattered light. / Varghese, Babu; Rajan, Vinayakrishnan; van Leeuwen, Ton; Steenbergen, Wiendelt.

In: Optics communications, Vol. 281, No. 3, 2008, p. 494-498.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - High angle phase modulated low coherence interferometry for path length resolved Doppler measurements of multiply scattered light

AU - Varghese, Babu

AU - Rajan, Vinayakrishnan

AU - van Leeuwen, Ton

AU - Steenbergen, Wiendelt

PY - 2008

Y1 - 2008

N2 - We describe an improved method for coherence domain path length resolved measurements of multiply scattered photons in turbid media. An electro-optic phase modulator sinusoidally modulates the phase in the reference arm of a low coherence fiber optic Mach–Zehnder interferometer, at a high phase modulation angle. For dynamic turbid media this results in Doppler broadened phase modulation interference peaks at the modulation frequency and its multiples. The signal to noise ratio is increased by almost one order or magnitude for large modulation angles and the shape of the spectral peaks resulting from the interference of Doppler shifted sample waves and reference light is not changed. The path length dependent Doppler broadening is compared with the theoretical predictions in the single scattered and diffusive regimes. The experimentally measured optical path lengths are validated with the Monte Carlo technique.

AB - We describe an improved method for coherence domain path length resolved measurements of multiply scattered photons in turbid media. An electro-optic phase modulator sinusoidally modulates the phase in the reference arm of a low coherence fiber optic Mach–Zehnder interferometer, at a high phase modulation angle. For dynamic turbid media this results in Doppler broadened phase modulation interference peaks at the modulation frequency and its multiples. The signal to noise ratio is increased by almost one order or magnitude for large modulation angles and the shape of the spectral peaks resulting from the interference of Doppler shifted sample waves and reference light is not changed. The path length dependent Doppler broadening is compared with the theoretical predictions in the single scattered and diffusive regimes. The experimentally measured optical path lengths are validated with the Monte Carlo technique.

KW - IR-76413

KW - METIS-243135

U2 - 10.1016/j.optcom.2007.09.050

DO - 10.1016/j.optcom.2007.09.050

M3 - Article

VL - 281

SP - 494

EP - 498

JO - Optics communications

JF - Optics communications

SN - 0030-4018

IS - 3

ER -