Interference and Measurements
João Carlos Pinheiro Beck, PUCRS, Faculdade de Engenharia, Dep. de Engenharia Mecanica e Mecatrônica, Porto Alegre, RS, Brasil
ABSTRACT In the measure of deformations by the use of strain gauges, in a general manner these electrical measurements are made in areas where we have present electric and magnetic fields. These fields generally produce noise and inexactitude because the interferences when measurements are made in the interest electrical signal. The identification of these fields the forms of appear and interference characteristics have a great importance for to reduce, to prevent or to eliminate their atuation in the measure equipment. In this work we describe the way through the exterior noise are induced in the circuits. It is necessary first to understand the types and characteristics of electrical noise, as well as the sources of such noise. This paper identifies some of the more common noise sources, and describes the way by which the interference is induced. The identification and study these phenomena are the extra ordinary importance and significance for those realize experimental measurements.
Publication Source: NDTISS '99 - International Symposium on NDT Contribution to the Infrastructure Safety Systems, Nov 1999 in Tores Brazil.
Publisher: Center of Tecnology, Federal University of Santa Maria (UFSM) - [Homepage]
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