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Characterization and validation of the frequency-modulated continuous-wave technique for assessment of photon migration in solid scattering media

Författare:
Publiceringsår: 2012
Språk: Engelska
Sidor: 467-475
Publikation/Tidskrift/Serie: Applied Physics B
Volym: 109
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: Springer

Sammanfattning

The frequency-modulated continuous-wave (FMCW)

technique, based on the beat signal of a Mach–

Zehnder interferometer employing a frequency-ramped light

source, is studied for solid scattering media applications.

The method is used to evaluate the mean time-of-flight

(MTOF) of light traveling in scattering media, specifically

polystyrene foams. We assume that each the time-of-flight

(TOF) time corresponds to different light scattering paths

resulting in a different phase shift. The phase shift variations

produce a speckle pattern, which together with the frequency leakage induced by the discrete Fourier transform

(DFT) cause “spikes” in the power spectrum of the beat signal,

thus decreasing the accuracy of the measured MTOF

values in solid scattering media. For comparison, time-offlight

spectroscopy (TOFS) is also employed to evaluate the

MTOF for the same samples, while the geometrical difference

between these two techniques is compensated for

by using diffusion theory. The MTOFs measured by the

FMCW and TOFS techniques agree well, which demonstrates

a great potential to develop a robust FMCW setup for

simplified MTOF assessment.

Nyckelord

  • Atom and Molecular Physics and Optics

Övriga

Published
  • Biophotonics-lup-obsolete
  • ISSN: 0946-2171

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