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

Mei, Liang LU ; Lundin, Patrik LU ; Andersson-Engels, Stefan LU ; Svanberg, Sune LU and Somesfalean, Gabriel LU (2012) In Applied Physics B 109(3). p.467-475
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
109
issue
3
pages
467 - 475
publisher
Springer
external identifiers
  • wos:000312081700013
  • scopus:84875915793
ISSN
0946-2171
DOI
10.1007/s00340-012-5103-9
language
English
LU publication?
yes
id
9f05e3e7-ee6f-4572-801f-21b949833c93 (old id 3232342)
date added to LUP
2012-12-07 13:35:38
date last changed
2017-04-23 03:02:26
@article{9f05e3e7-ee6f-4572-801f-21b949833c93,
  abstract     = {The frequency-modulated continuous-wave (FMCW)<br/><br>
technique, based on the beat signal of a Mach–<br/><br>
Zehnder interferometer employing a frequency-ramped light<br/><br>
source, is studied for solid scattering media applications.<br/><br>
The method is used to evaluate the mean time-of-flight<br/><br>
(MTOF) of light traveling in scattering media, specifically<br/><br>
polystyrene foams. We assume that each the time-of-flight<br/><br>
(TOF) time corresponds to different light scattering paths<br/><br>
resulting in a different phase shift. The phase shift variations<br/><br>
produce a speckle pattern, which together with the frequency leakage induced by the discrete Fourier transform<br/><br>
(DFT) cause “spikes” in the power spectrum of the beat signal,<br/><br>
thus decreasing the accuracy of the measured MTOF<br/><br>
values in solid scattering media. For comparison, time-offlight<br/><br>
spectroscopy (TOFS) is also employed to evaluate the<br/><br>
MTOF for the same samples, while the geometrical difference<br/><br>
between these two techniques is compensated for<br/><br>
by using diffusion theory. The MTOFs measured by the<br/><br>
FMCW and TOFS techniques agree well, which demonstrates<br/><br>
a great potential to develop a robust FMCW setup for<br/><br>
simplified MTOF assessment.},
  author       = {Mei, Liang and Lundin, Patrik and Andersson-Engels, Stefan and Svanberg, Sune and Somesfalean, Gabriel},
  issn         = {0946-2171},
  language     = {eng},
  number       = {3},
  pages        = {467--475},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Characterization and validation of the frequency-modulated continuous-wave technique for assessment of photon migration in solid scattering media},
  url          = {http://dx.doi.org/10.1007/s00340-012-5103-9},
  volume       = {109},
  year         = {2012},
}