We developed simultaneous phase-shifting system based on a Mach-Zehnder interferometer and a replicating system integrated by a Michelson configuration and a cube beam splitter. The system is capable to obtain four simultaneous interferograms in a single capture, and the phase shifts are controlled by placing a linear polarizer in each replica obtained. The system retrieves four interferograms with a relative phase shift of π/2 and the optical phase map is calculated using the four-step algorithm. In addition, the configuration presents potential capabilities for generating spiral interference patterns. To show the advantage of the technique, experimental results are presented for static and dynamic samples.
Using a 4f optical system, the Hilbert transform [1] of the projections of the object slice is implemented to reconstruct its edge enhancement using the parallel projection tomography. The projection going out of the object is considered as the entrance to the 4f optical system, the filter employed in the Fourier plane consisting of a phase step of π radians, in the image plane, as it is well known, the output function is given by the convolution of the impulse response and the input function, then in the image plane the Hilbert transform of the projection is obtained. We show that the reconstruction in this case is the Hilbert transform in vertical direction of the slice function, which is a special case. Also study in detail the synthesis of the filter in order to obtain the reconstruction the edge enhanced in an arbitrary direction, which is general case.
Se llevó acabo la síntesis de micropartículas de cobre (CuMP) por el método de reducción química asistida por microondas y se caracterizaron con las técnicas de SEM, XRD y EDS. Las CuMP obtenidas por este método presentaron morfologías poliédricas muy definidas (cubos, icosaedros, prismas hexagonales) y su tamaño de partícula fue del orden micrométrico (≤ 10 μm). Estas propiedades, le confieren una prometedora aplicación como agente antimicrobiano y fueron evaluadas con sepas de dos diferentes bacterias E. Coli y S Aureus. Las partículas se soportaron sobre una membrana polimérica biodegradable a base de poli-ácido láctico (PLA) y poli-vinilalcohol (PVA) suspendiendo las CuMP´s en uno de los polímeros. Las membranas fueron hechas por la técnica de electro-hilado y caracterizadas por las técnicas de SEM y EDS.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.