Miguel León-Rodríguez

The kinematic assessment of the upper limbs in breast cancer (BC) survivors is one of the most common procedures to determine the recovery process after BC surgery. However, the methodology used is heterogeneous, finding various evaluation methods, which makes it difficult to compare results between studies. The objective of this review was to iden...

The objective of this study was to analyze the footprint morphology and obtain the Chippaux-Smirak Index in a Mexican population to identify the type of feet and its prevalence. A database of images of the soles of both feet was analyzed. The database contained images of 1,014 persons between 2 and 73 years old from Guanajuato state, Mexico. Moreov...

The two-dimensional phase unwrapping problem (PHUP) has been solved with discrete Fourier transforms (FTs) and many other techniques traditionally. Nevertheless, a formal way of solving the continuous Poisson equation for the PHUP, with the use of continuous FT and based on distribution theory, has not been reported yet, to our knowledge. The well-...

Visualizing two variables in the fluid flow requires a complex optical system to fulfill such a purpose. Furthermore, in these applications, measuring the temperature fields of the fluid is sometimes necessary. In this work, we use a color digital camera to record in one snapshot shadowgraph and two direction sensitivity Schlieren images. Furthermo...

Residual stresses' magnitude generated by deposition, quenching stress, thermal stress operation temperature, and infiltration in the thermal barrier coating (TBC) of gas turbines was determined. A thermal barrier coating was manufactured by the deposition of two layers, CoNiCrAlY and yttria-stabilized zirconia (YSZ), on an AISI 304 stainless steel...

The inclusion of the Internet of Things (IoT) in greenhouses has become a fundamental tool for improving cultivation systems, offering information relevant to the greenhouse manager for decision making in search of optimum yield. This article presents a monitoring system applied to an aeroponic greenhouse based on an IoT architecture that provides...

In recent years, the automotive industry has had remarkable technological growth. Organizations strive to have in their processes more advanced technologies that allow them to create a competitive advantage over others within the same field. The spline rolling and the threading process have evolved in line with the significant demand for quali...

Publicaciones DYNA SL-c) Mazarredo nº69-2º-48009-BILBAO (SPAIN) Tel +34 944 237 566-www.revistadyna.com-ABSTRACT In recent years, the automotive industry has had remarkable technological growth. Organizations strive to have in their processes more advanced technologies that allow them to create a competitive advantage over others within the same fi...

technological growth. Organizations strive to have in their processes more advanced technologies that allow them to create a competitive advantage over others within the same field. The spline rolling and the threading process have evolved in line with the significant demand for quality products from major automakers in the automotive industry...

After breast cancer surgery, women might develop musculoskeletal impairments that affect movements of the upper limbs and reduce the quality of life. The objective of this research was to analyze the effect of the unilateral breast cancer surgery on the kinematics of the shoulder and the electrical activity of the upper trapezius, middle deltoid an...

After mastectomy, women might lose mobility and develop kinematic changes in the shoulder. The objective of this research was to compare the kinematics of the glenohumeral joint in women, before and after unilateral breast cancer surgery. This was a longitudinal study with a pre- and post-evaluation design; in total, 15 Mexican women who had a mast...

Citation: García-Espinosa, D.A.; León-Rodríguez, M.; Yañez-Contreras, P.; Miguel-Andrés, I.; Padilla-Medina, J.A.; Cruz-Bernal, A.; Ibarra-Torres, P. Digital Holographic Microscopy as Identifier of Ultrafine Particles Emitted during Fused Deposition Modelling. Appl. Sci. 2022, 12, 65. https://doi.

The fringe projection technique is considered one of the most reliable solutions for structured light technology, developed for non-contact three-dimensional (3D) data acquisition. When working with this technique, applying it on a microscopic scale, one often encounters some problems such as the limited depth of field of the projected fringe patte...

In this work, we present a panoramic digital holographic system for the first time capable of obtaining 3D information of a quasi-cylindrical object by using a conical mirror. The proposed panoramic digital holographic system is able to scan the entire surface of the object to determine the amplitude and phase simultaneously. This paper demonstrate...

Dedicated to Prof Pramod Kumar Rastogi for his outstanding contributions to Optical Metrology This paper presents a panoramic holographic reconstruction of a cylindrical object with a conical mirror. This panoramic holographic system has the advantage to obtain 3D information for 360 degrees view in one-shot. We use the phase-shifting method to det...

In this work, we present the effect of the amount of CMAS infiltration into YSZ of Thermal barrier coatings (TBC) on the magnitude of residual stresses. The (TBC) were deposited by thermal spraying of CoNiCrAlY (Bond Coat-BC) and YSZ (Top Coat-TC) powders. The deposition of the BC was through the high velocity oxygen fuel (HVOF) system. The TC was...

Materiales Metalúrgicos Avanzados Publicaciones DYNA SL-c) Mazarredo nº69-4º-48009-BILBAO (SPAIN) Tel +34 944 237 566-www.revistadyna.com-Thermal barrier coatings (TBC) are commonly employed in the hot sections of gas turbines to provide protection against hot corrosion and oxidation of critical components [1] and consist of by two layers of differ...

Abstract Introduction and objective. Previous studies have suggested that differences in the structure of the feet might affect the behaviour of plantar pressure distribution, this might increase the probability of getting injured. The objective of this work was to determine the effect of the morphology of the soles of the feet on plantar pressure...

Resumen-En este trabajo de investigación se desarrolló la mejora en el rendimiento de una cremallera de rolado de envolvente, ya que se tenía problemas de bajo rendimiento comparado con cremalleras similares que se tienen trabajando en la empresa de autopartes GKN Driveline Celaya. El objetivo mínimo de rendimiento de la cremallera fue de 25,000 pi...

When recovering smooth phases by phase unwrapping algorithms, many non-iterative algorithms are available. However, normally those algorithms offer approximations of the current phase that cannot be accurate enough. This is because the majority of them are based on global approaches, instead of local ones. Although the smooth estimations are not of...

A method for measuring planar temperature fields of fluid flows is proposed. The focusing schlieren technique together with a calibration procedure to fulfill such a purpose is used. The focusing schlieren technique uses an off-axis circular illumination to reduce the depth of focus of the optical system. The calibration procedure is based on the r...

This work is part of an Inter-Institutional project to understand the problem of degradation suffered by thermal barrier coatings of gas turbines. Thermal barrier coatings (TBC) were manufactured by deposition of two layers of different chemical composition, namely CoNiCrAlY and yttria-stabilized zirconia (YSZ) on an AISI 304 stainless steel substr...

In this work, we propose a method to measure planar temperature fields of fluids flow. We used a focusing schlieren technique together with a calibration procedure to fulfill such purpose. The focusing schlieren technique uses an off-axis circular illumination to reduce the depth of focus of the optical system. The calibration procedure is based on...

In order to recover the holographic object information, a method based on the recording of two digital holograms, not only at different planes but also in a slightly off-axis scheme, is presented. By introducing a π-phase shift in the reference wave, the zero-order diffracted term and the twin image are removed in the frequency domain during the pr...

A simple strategy based on wavefront propagation in Fresnel regime to reduce ringing effect by using an ideal filter in off-axis digital holography is presented. In addition, we demonstrate a better focusing capacity by using this ideal filter than Butterworth and Gaussian. The reconstructed and enhanced image is obtained from the averaging operati...

3D shape recovery systems, based on structured light projection, allow recovering three-dimensional shape from complex opaque surfaces. Particularly, when a fringe pattern with sinusoidal profile is projected on a surface and algorithms for recovering optical phase are performed for its demodulation, sub-micrometer resolutions can be obtained. The...

In the schlieren method, the deflection of light by the presence of an inhomogeneous medium is proportional to the gradient of its refractive index. Such deflection, in a schlieren system, is represented by light intensity variations on the observation plane. Then, for a digital camera, the intensity level registered by each pixel depends mainly on...

We show how a sinusoidal fringe pattern can be obtained by using a single cube beam splitter based on the Gates' interferometer configuration. When an expanded and collimated laser beam hits the binding edge of a nonpolarizing cube beam splitter parallel to the splitter coating, it generates interference fringes at the exit due to the internal refl...

The refocusing capacity is a unique feature of digital holography. In this chapter, we show the capability of reconstructing digital holograms at different planes for different purposes. One of such purposes is to increase the focus depth of the microscope system. First, we show experimental results of the feasibility to perform digital holographic...

In the Hartmann test, a wave aberration function $W$ is estimated from the information of the spot diagram drawn in an observation plane. The distance from a reference plane to the observation plane, the Hartmann-plane distance, is typically chosen as $z=f$, where $f$ is the radius of a reference sphere. The function $W$ and the transversal aberrat...

In the schlieren method, the deflection of light by the presence of an inhomogeneous medium is proportional to the gradient of its refractive index. In the presence of temperature variations in a fluid flow, the refraction index is related to the gas density by the Gladstone-Dale constant, which depends on the nature of the gas and the wavelength o...

A simple strategy based on wavefront propagation in the Fresnel regime to reduce a ringing effect by using an ideal filter in off-axis digital holography (DH) is presented. In addition, we demonstrate a better focusing capacity by using this ideal filter than Butterworth and Gaussian methods. It also provides a way to increase the visibility of the...

DHF allowed us to retrieve whole field maps of the refraction index of cuticles isolated from the abaxial surface of leaves; these were in turn sampled from an apple tree (Malus domestica).

In this work, we propose a dual-wavelength in-line digital holographic microscopy (DHM) configuration in order to eliminate the conjugate image and reach the maximum resolution of CCD. By using this configuration, two holograms are acquired in one shot. Our method is based not only on the recordings of two holograms at slightly different planes, bu...

Digital Holographic Microscopy (DHM) typically uses either Michelson or Mach–Zehnder interferometers as interferometric tools to attain digital holograms. These interferometers need not only good optical alignment in order to compensate the spherical aberration, but also a special optical path difference compensation system when a low coherence ill...

In this work, we present a new method to reduce the shot noise in phase imaging of digital holograms. A spatial averaging process of phase images reconstructed at different reconstruction distances is performed, with the reconstruction distance range being specified by the numerical focus depth of the optical system. An improved phase image is atta...

In this paper we present a method to get the complex amplitude of a digital hologram obtained through phase shifting transmission digital holographic microscopy. This is based on the angular spectrum method as a reconstruction algorithm employing an in–line experimental setup. The reconstruction technique automatically eliminates the zero order and...