Phantoms simulate optical characteristics of tissues. Phantoms use to mimic light distributions in living tissue. Several
Phantoms compositions made of silicone, polyester, polyurethane, and epoxy resin have been described in the literature.
These kinds of phantoms have the problem of long time preservation. In this work, we describe the fabrication and
characterization of phantoms with low concentrations of synthetic lipid using Raman spectroscopy. We fabricate four
phantoms made of Polydimethylsiloxane (PDMS). These phantoms have synthetic lipid content of cholesterol and
The size of our phantoms is 1 x 1 cm and 5 mm of thickness.We used the point-to-point mapping technique. Finally, we
compared advantages and performance of made PDMS and gelatin phantoms.
In this paper we propose the fabrication, implementation, and testing of a novel fiber optic sensor based on Multimode
Interference (MMI) effects for independent measurement of curvature and temperature. The development of fiber based
MMI devices is relatively new and since they exhibit a band-pass filter response they can be used in different
applications. The operating mechanism of our sensor is based on the self-imaging phenomena that occur in multimode
fibers (MMF), which is related to the interference of the propagating modes and their accumulated phase. We
demonstrate that the peak wavelength shifts with temperature variations as a result of changes in the accumulated phase
through thermo-optics effects, while the intensity of the peak wavelength is reduced as the curvature increases since we
start to loss higher order modes. In this way both measurements are obtained independently with a single fiber device.
Compared to other fiber-optic sensors, our sensor features an extremely simple structure and fabrication process, and
hence cost effectiveness.
We study practical opportunities of characterizing the angular or frequency bandwidth as well as the number of
resolvable elements (spots) within a two-phonon light scattering in optically and acoustically anisotropic tellurium
dioxide crystal when the efficiency of acousto-optical interaction is small enough to consider these problems in the
first-order approximation. Then, an approach based on the transfer function technique is applied to estimating the
angular bandwidth inherent in acousto-optical cell operating in a two-phonon light scattering regime. The obtained
result is compared with the data related to a one-phonon regime of light scattering in isotropic medium. Finally, the
number of resolvable elements is estimated for a two-phonon light scattering regime. In so doing, the combined
diagram illustrating joint effect of a triplet of such factors as the geometric limitations and the acoustic attenuation,
which restrict the number of spots just in the regime under consideration, has been created for the first time.