Imaging through highly scattering media using Fresnel zone plate scanning holography

The Fresnel zone plate scanning holography is applied in the imaging through highly scattering media. The background noise of the reconstructed image is resulted from the nonnegative coded function. A method of constructing composite hologram for reducing the background noise is proposed. The reconstructions with good-quality signal-to-noise ratio and contrast ratio are obtained in experiments. The system point spread function (PSF) is designed to be similar to the Dirac delta function. The experimental results and the theoretical calculation of the PSF are in accordance. The experiments on absorbers embedded in the intralipid solution with the concentration of 1% and the depth of 1.7 cm are implemented. The results demonstrate that the reconstructions of the metal ring with the diameter of 6 mm and the metal wire with the diameter of 0.4 mm are clear. The reconstruction of the black plastic ball with the diameter of 2.5 mm is also satisfied.