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Träfflista för sökning "WFRF:(Alerstam Erik) srt2:(2012)"

Sökning: WFRF:(Alerstam Erik) > (2012)

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1.
  • Alerstam, Erik, et al. (författare)
  • Observation of anisotropic diffusion of light in compacted granular porous materials
  • 2012
  • Ingår i: Physical Review E (Statistical, Nonlinear, and Soft Matter Physics). - 1539-3755. ; 85:4
  • Tidskriftsartikel (refereegranskat)abstract
    • By analyzing spatio-temporal characteristics of short optical pulses diffusively transmitted through compacted granular materials, we reveal that powder compaction can give rise to strongly anisotropic light diffusion. Our disclosure represents a revision of the understanding of optics of powder compacts. Routes to material characterization and investigation of compression-induced structural anisotropy are opened, and the falsification of isotropic models have implications for quantitative spectroscopy of powder compacts (e.g., pharmaceutical tablets).
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2.
  • Alerstam, Erik, et al. (författare)
  • Single-fiber diffuse optical time-of-flight spectroscopy
  • 2012
  • Ingår i: Optics Letters. - 0146-9592. ; 37:14, s. 2877-2879
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate interstitial diffuse optical time-of-fight spectroscopy based on a single fiber for both light delivery and detection. Detector saturation due to the massive short-time reflection is avoided by ultrafast gating of a single photon avalanche diode. We show that the effects of scattering and absorption are separable and that absorption can be assessed independently of scattering. Measurements on calibrated liquid phantoms and subsequent Monte Carlo-based evaluation illustrate that absorption coefficients can be accurately assessed over a wide range of medically relevant optical properties. Our findings pave the way to simplified and less invasive interstitial in vivo spectroscopy. (C) 2012 Optical Society of America
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