Examinando por Materia "Measurement methods"
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Ítem Instrumented study of the wheel-Rail interaction(JVE International, 2015-01-01) Zóltowski, B.; Castaneda, L.; Zóltowski, M.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)This article describes a measurement method whit strain gages, which allows measure the vertical force independently of the lateral force in the wheel - Track interface of a railway. It also shows the obtained results from the implementation of this method to measure the forces in a commercial railway of the railway system. © JVE International Ltd.Ítem Performance characterization of an xy-stage applied to micrometric laser direct writing lithography(MDPI AG, 2017-02-01) Jaramillo J; Zarzycki A; Galeano J; Sandoz P; Universidad EAFIT. Departamento de Ciencias Básicas; Electromagnetismo Aplicado (Gema)This article concerns the characterization of the stability and performance of a motorized stage used in laser direct writing lithography. The system was built from commercial components and commanded by G-code. Measurements use a pseudo-periodic-pattern (PPP) observed by a camera and image processing is based on Fourier transform and phase measurement methods. The results report that the built system has a stability against vibrations determined by peak-valley deviations of 65 nm and 26 nm in the x and y directions, respectively, with a standard deviation of 10 nm in both directions. When the xy-stage is in movement, it works with a resolution of 0.36 µm, which is an acceptable value for most of research and development (R and D) microtechnology developments in which the typical feature size used is in the micrometer range. © 2017 by the authors; licensee MDPI, Basel, Switzerland.