2-DIMENSIONAL IMAGING THROUGH TURBID MEDIA USING A CONTINUOUS-WAVE LIGHT-SOURCE

We introduce here a scheme for two-dimensional imaging of an object hi dden in a turbid medium using a low power continuous wave source and r eport its practical implementation. As already known, periodic polaris ation modulation of an input continuous wave and subsequent polarisati on discrimination enables the separation of the ballistic signal from the diffuse light. In the present work, this is achieved by modulating the input polarisation, recording a sequence of spatially filtered im ages using a CCD camera, and Fourier transforming the time sequence to extract the periodic ballistic signal. With this technique we have ac hieved sub-millimeter resolution imaging in scattering media that are more than 30 transport mean free paths thick. (C) 1998 Published by El sevier Science B.V. All rights reserved.