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Conferences > AOIPM > 1994 > DCWI > DCWI.288

Imaging of Turbid Media with a Spatial Filter

Lihong Wang, Andreas H. Hielscher, Steven L. Jacques, Dawn V. Stephens, and Frank K. Tittel

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Abstract

A buried object inside a turbid medium was imaged using a continuous-wave laser of 5-mW output power and a spatial filter. The spatial filter consists of a lens of 4-cm focal length and a pinhole of 10-μm diameter. A lock-in amplifier was used to reduce the noise. An absorbing rod of 2-mm diameter was buried in the center of a 5-cm thick cuvette filled with polystyrene spheres solution. The object was detected with a contrast of 99% when the turbid medium was 20 mean free path thick, and 10% when 30 mean free path thick.

© 1994 Optical Society of America

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