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Engineering Department, University of Almería, Ctra. de Sacramento s-n, La Cañada 04120, Spain





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Academic Editor: Vittorio M. N. Passaro

Abstract Most experimental fields of science and engineering require the use of data acquisition systems DAQ, devices in charge of sampling and converting electrical signals into digital data and, typically, performing all of the required signal preconditioning. Since commercial DAQ systems are normally focused on specific types of sensors and actuators, systems engineers may need to employ mutually-incompatible hardware from different manufacturers in applications demanding heterogeneous inputs and outputs, such as small-signal analog inputs, differential quadrature rotatory encoders or variable current outputs. A common undesirable side effect of heterogeneous DAQ hardware is the lack of an accurate synchronization between samples captured by each device. To solve such a problem with low-cost hardware, we present a novel modular DAQ architecture comprising a base board and a set of interchangeable modules. Our main design goal is the ability to sample all sources at predictable, fixed sampling frequencies, with a reduced synchronization mismatch <1 µs between heterogeneous signal sources. We present experiments in the field of mechanical engineering, illustrating vibration spectrum analyses from piezoelectric accelerometers and, as a novelty in these kinds of experiments, the spectrum of quadrature encoder signals. Part of the design and software will be publicly released online. View Full-Text

Keywords: accelerometers; impact tests; firmware design; microcontroller; open source; quadrature encoders; vibration analysis accelerometers; impact tests; firmware design; microcontroller; open source; quadrature encoders; vibration analysis





Autor: José Luis Blanco-Claraco * , Javier López-Martínez, José Luis Torres-Moreno and Antonio Giménez-Fernández

Fuente: http://mdpi.com/



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