Research Center e Innovacion Tecnologica

Santa Catarina Mechoacán, Mexico

Research Center e Innovacion Tecnologica

Santa Catarina Mechoacán, Mexico
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Perez-Sanchez G.G.,Metropolitan Autonomous University | Perez-Torres J.R.,Tecnologico de Estudios Superiores de Coacalco | Flores-Bravo J.A.,Research Center e Innovacion Tecnologica | Alvarez-Chavez J.A.,Research Center e Innovacion Tecnologica | Martinez-Pi'on F.,Research Center e Innovacion Tecnologica
Journal of Physics: Conference Series | Year: 2017

Gravimeters are devices that can be used in a wide range of applications, such as mining, seismology, geodesy, archeology, geophysics and many others. These devices have great sensibility, which makes them susceptible to external vibrations like electromagnetic waves. There are several technologies regarding gravimeters that are of use in industrial metrology. Optical fiber is immune to electromagnetic interference, and together with long period gratings can form high sensibility sensors of small size, offering advantages over other systems with different technologies. This paper shows the development of an optical fiber gravimeter doped with Erbium that was characterized optically for loads going from 1 to 10 kg in a bandwidth between 1590nm to 1960nm, displaying a weight linear response against power. Later on this paper, the experimental results show that the previous described behavior can be modeled as characteristic function of the sensor. © Published under licence by IOP Publishing Ltd.


Sanchez-Lara R.,Research Center e Innovacion Tecnologica | Alvarez-Chavez J.A.,Research Center e Innovacion Tecnologica | De La Cruz-May L.,Autonomous University of Carmen | Mendez Martinez F.,Autonomous University of Carmen
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

There are basically five nonlinear phenomena that occur in the optical fiber which limits the power or distort the signal in the data transmission. One of the most important is the phenomenon called Stimulated Brillouin Scattering (SBS) as it only requires relatively low pump power for affecting signal power in single and multiwavelength transmission in DWDM systems, for instance. There are numerous studies of this phenomenon that deal with power threshold determination which represents the limit on the transmit power but many of them are very complex and not very clear. In this work we propose a simple algorithm for the analysis and simulation of Brillouin power threshold by choosing a set-point. The results are obtained via solving the proposed set of coupled differential equations which then are compared to experimental results for Brillouin and Rayleigh scattering and forward power, i.e. residual pump. © 2014 SPIE.


Pulido-Navarro M.G.,Research Center e Innovacion Tecnologica | Alvarez-Chavez J.A.,Research Center e Innovacion Tecnologica | Escamilla-Ambrosio P.J.,National Polytechnic Institute of Mexico
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Lately, there has been a huge demand for smart structures. In particular the interest has growth in those structures able to detect deterioration conditions and possible failure. Failure prevention requires an appropriate monitoring and maintenance system. Currently, there are available several types of sensors capable of detecting problems in structures, among them, sensors based on optical fibers have been proposed as they represent a non-invasive technique. Some optical fiber sensors are based on Bragg gratings. A grating is a periodical index perturbation of the fiber core which is most commonly achieved through UV radiation. Another technique used to fabricate the gratings, which has not been studied extensively, is electric arc. Therefore, in this work we propose the use of this technique to fabricate fiber optical sensors based on Long Period Fiber Gratings (LPFG). Manufacturing LPFG through electric arc has the advantage of being quite flexible, inexpensive, present very high temperature stability and can be applied to any type of optical fiber. LPFG with a period of 500 microns and 20 mm of length were fabricated through electric arc on standard monomode fibers with the help of a fusion machine and its spectrum was observed by an Optical Spectrum Analyzer (OSA). This type of LPFG is tunable by changing the fabrication parameters of the electric arc which in turns will vary its sensitivity to measure strain on structures when it is used as a sensor. Also, in this paper a theoretical and analytical examination of arc induced LPFG is presented. Mathematical analysis and simulation of the sensor based on LPFG were carried out using the software MATLAB. © 2014 SPIE.


Lopez-Baez I.,National Polytechnic Institute of Mexico | Martinez-Franco E.,Research Center e Innovacion Tecnologica | Zoz H.,Zoz GmbH | Trapaga-Martinez L.G.,National Polytechnic Institute of Mexico
Revista Mexicana de Fisica | Year: 2011

The ball milling (BM) of blended Ni and Cr elemental powders was carried out in a Simoloyer performing on high-energy scale mode at maximum production to obtain a nanostructured Ni-20Cr alloy. The phase transformations and structural changes occurring during mechanical alloying were investigated by X-ray diffraction (XRD) and optical microscopy (OM). A gradual solid solubility of Cr and the subsequent formation of crystalline metastable solid solutions described in terms of the Avrami-Erofe'ev kinetics model were calculated. The XRD analysis of the structure indicates that cumulative lattice strain contributes to the driving force for solid solution between Ni and Cr during BM. Microstructure evolution has shown, additionally to the lamellar length refinement commonly observed, the folding of lamellae in the final processing stage. OM observations revealed that the lamellar spacing of Ni rich zones reaches a steady value near 500 nm and almost disappears after 30 h of milling.


Perez-Sanchez G.G.,Research Center e Innovacion Tecnologica | Pinzon-Escobar E.,National Autonomous University of Mexico | Alvarez-Chavez J.A.,Research Center e Innovacion Tecnologica
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

We present results based on theoretical analysis on how fiber sources doped with Er3+ and Er3+/Yb3+ operate in the amplified spontaneous emission (ASE) regime. Results of the model such as pump response, output in the forward and backward directions along the length of the fiber and output efficiency are presented. After more development, these sources could be used in DWDM systems to generate a number of signals around the 1550nm window. © 2012 SPIE.


Rojas-Chavez H.,Research Center e Innovacion Tecnologica | Reyes-Carmona F.,National Autonomous University of Mexico | Plascencia G.,Research Center e Innovacion Tecnologica | Jaramillo-Vigueras D.,Research Center e Innovacion Tecnologica
Materials Science Forum | Year: 2010

Synthesis of intermetallic PbSe induced by high-energy ball milling has been studied. Systematic analysis of transformation in the resulting phases of milling from 0 to 10 h has been traced by characterizing the microstructures in terms of morphology, crystallite size, and percentages of phases formed as a function of milling time. Results reveal the formation of two phases. Where the system of PbO-Se transforms gradually to PbSe. Complete transformation is achieved after 10 h of milling time. Study of particle structure by the Rietveld Method further corroborates the value of the nano-order crystallite diameters as evaluated from the microscopic studies. © (2010) Trans Tech Publications.


Rojas-Chavez H.,Research Center e Innovacion Tecnologica | Rojas-Chavez H.,Research Center en Ciencia Aplicada y Tecnologia Avanzada | Reyes-Carmona F.,National Autonomous University of Mexico | Jaramillo-Vigueras D.,Research Center e Innovacion Tecnologica
Materials Research Bulletin | Year: 2011

Both solid-solid and gas-solid reactions have been traced during high-energy milling of Se and PbO powders under vial (P, T) conditions in order to synthesize the PbSe phase. Chemical and thermodynamic arguments are postulated to discern the high-energy milling mechanism to transform PbO-Se micropowders onto PbSe-nanocrystals. A set of reactions were evaluated at around room temperature. Therefore an experimental campaign was designed to test the nature of reactions in the PbO-Se system during high-energy milling. © 2011 Elsevier Ltd. All rights reserved.


Perez-Sanchez G.,Research Center e Innovacion Tecnologica | Alvarez-Chavez J.A.,Research Center e Innovacion Tecnologica
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

There are a few semi-conductor, multiple-wavelength, high-performance sources already available for ITU-T channel generation in DWDM systems. The 200 Ghz barrier has imposed a limitation to such sources. An option for overcoming such a limitation is a super-continuum, all fibre source working in the amplified spontaneous emission regime. Furthermore, in this work we propose an Er-doped fiber based Mach-Zehnder interferometer, made with mechanicallyinduced, long-period fiber gratings, which generate a fringe pattern ranging from 1450 to 1650 nm. These characteristics are of great interest for the development of all-fiber devices that could produce and even select a few channels in the 1550nm region, the transmission window of interest for ultra-long haul optical communication systems. A full set of optical characterization and results will be included in the presentation. © 2013 SPIE.


Barron M.A.,Metropolitan Autonomous University | Hilerio I.,Metropolitan Autonomous University | Plascencia G.,Research Center e Innovacion Tecnologica
Advances in Mechanical Engineering | Year: 2012

The emergence of the oscillation death phenomenon in a ring of four coupled self-excited elastic beams is numerically explored in this work. The beams are mathematically represented through partial differential equations which are solved by means of the finite differences method. A coupling scheme based on shared boundary conditions at the roots of the beams is assumed, and as initial conditions, zero velocity of the first beam and three normal vibration modes of a linear elastic beam are employed. The influence of the self-exciting constant on the ring dynamics is analyzed. It is observed that oscillation death arises as result of the singularity of the coupling matrix. Copyright © 2012 Miguel A. Barron et al.


Rojas-Chavez H.,Tláhuac Institute of Technology | Rojas-Chavez H.,Research Center en Ciencia Aplicada y Tecnologia Avanzada | Reyes-Carmona F.,National Autonomous University of Mexico | Garibay-Febles V.,Mexican Institute of Petroleum | Jaramillo-Vigueras D.,Research Center e Innovacion Tecnologica
Journal of Nanoparticle Research | Year: 2013

Transformations from precursors to nanoparticles by high-energy milling are promoted by two major driving forces, namely physical and/or chemical. While the former has been difficult to trace since stress, strain and recovery may occur almost simultaneously during milling, the latter has been sequentially followed as an evolution from precursors to intermediate phases and thereof to high purity nanocrystals. The specific objective of this work is to discern how solid-solid and partially solid-gas reactions manifest themselves correspondingly as a short-range diffusion through an interface or how vapor species, as a subliming phenomenon, grows as a different phase on an active local surface. These series of changes were traced by sub-cooling the as-milled powders extracted during a milling cycle. Through this experimental technique, samples were electron microscopically analyzed and where it was required, selected area electron diffraction images were obtained. High-resolution transmission electron microscopy results, unambiguously, confirm that nanocrystals in the last stage show a cubic morphology which average size distributions are around 17 nm. © 2013 Springer Science+Business Media Dordrecht.

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