Objetivo The project achieved its aim of measuring interference from equipment used below ground and thus providing insights into the interference sources and their effects on other items of plant. The investigation covered electromagnetic interference fields, and in particular guided and non-guided radiation.Interference fields are becoming more frequent underground, due in some measure to increased use of thyristor controls. These not only cause disturbance in operational fields such as locomotive radio, telecommunication and remote control, but increasingly affect electronic circuits. This also occurs because high-performance intrinsically safe systems comprise highly integrated electronic units or microprocessors requiring less energy than ever before for switching and storing signals; this means that not only do they respond more quickly to new interference levels, they can now be activated by existing levels which earlier would have had no effect. Our investigations into the behaviour of electromagnetic radio waves have already shown that their properties underground differ from those on the surface, e.g. there may be highly frequency-selective attenuation, and the shape of the worwing, strata composition and the coal itself strongly influence the range of interference fields. The same thing is likely to apply to the interference fields themselves.The aim of this research project is therefore to find out more about these interference fields, their propagation and their possible effects on electronic circuits, particularly those which have a bearing on safety. It is hoped the findings will enable circuits to be specifically designed to resist the type of interference encountered underground, this contributing to the formulation of practical new harmonized European standards to be applicable, in all Member States of the European Community. Programa(s) ECSC-WORKSAFE C - First joint research programme (ECSC) "Safety in the European Coal and Steel Community industries", 1989-1993 Tema(s) 2.4 - Monitoring, telemetry, data presentation, remote control, automation and communication Convocatoria de propuestas Data not available Régimen de financiación Data not available Coordinador DMT-GESELLSCHAFT FUER FORSCHUNG UND PRUEFUNG mbH Aportación de la UE Sin datos Dirección Franz-Fischer-Weg 61 45307 Essen Alemania Ver en el mapa Coste total Sin datos
