Spatial shift of spatially modulated light projected on turbid media.
This work extends modulated imaging, a recently developed technique based on the projection of structured light on a turbid medium that is able to measure optical properties of the high-scattering medium and perform tomography. We observe that structured light obliquely projected on a turbid medium undergoes a spatial shift during propagation. We propose a method to measure the spatial phase shift of a sinusoidal fringe pattern projected in a turbid medium, and we present a model derived from the diffusion approximation to describe the light propagation. Experimental validation by measurements performed on liquid phantoms is presented.
Bassi
Andrea
A
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci, Milano, Italy. andreabassi@polimi.it
Cuccia
David J
DJ
Durkin
Anthony J
AJ
Tromberg
Bruce J
BJ
D016880:Anisotropy; D002138:Calibration; D004867:Equipment Design; D008027:Light; D015233:Models, Statistical; D008962:Models, Theoretical; D009391:Nephelometry and Turbidimetry; D019047:Phantoms, Imaging; D011874:Radiometry / Q000379:methods*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D014054:Tomography / Q000295:instrumentation / Q000379:methods