1 March 2007 Path-length-resolved measurements of multiple scattered photons in static and dynamic turbid media using phase-modulated low-coherence interferometry
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J. of Biomedical Optics, 12(2), 024020 (2007). doi:10.1117/1.2714795
Abstract
In optical Doppler measurements, the path length of the light is unknown. To facilitate quantitative measurements, we develop a phase-modulated Mach-Zehnder interferometer with separate fibers for illumination and detection. With this setup, path-length-resolved dynamic light scattering measurements of multiple scattered light in static and dynamic turbid media are performed. Optical path length distributions spanning a range from 0 to 11 mm are measured from the area under the phase modulation peak around the modulation frequency in the power spectrum. A Doppler-broadened phase modulation interference peak is observed that shows an increase in the average Doppler shift with optical path length, independent of absorption. Validation of the estimated path length distributions is done by measuring their deformation for increasing absorption and comparing these observations with predictions based on Lambert-Beer's law.
Babu Varghese, Vinayakrishnan Rajan, Ton G. C. van Leeuwen, Wiendelt Steenbergen, "Path-length-resolved measurements of multiple scattered photons in static and dynamic turbid media using phase-modulated low-coherence interferometry," Journal of Biomedical Optics 12(2), 024020 (1 March 2007). http://dx.doi.org/10.1117/1.2714795
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KEYWORDS
Doppler effect

Absorption

Phase modulation

Light scattering

Scattering

Optical fibers

Heterodyning

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