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- Title
Path-length-resolved measurements of multiple scattered photons in static and dynamic turbid media using phase-modulated low-coherence interferometry.
- Authors
Babu Varghese; Vinayakrishnan Rajan; Ton G. Van Leeuwen; Wiendelt Steenbergen
- 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.
- Subjects
INTERFEROMETRY; ABSORPTION; OPTICAL instruments; OPTICAL measurements
- Publication
Journal of Biomedical Optics, 2007, Vol 12, Issue 2, p24020
- ISSN
1083-3668
- Publication type
Article
- DOI
10.1117/1.2714795