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Sign discriminating field mill |
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| Institution: | 1. Centro en Laseres y Aplicaciones (CEILAP) CITEDEF and UNIDEF (MINDEF-CONICET), Vicente Lopez, Buenos Aires, Argentina;2. CNRS – IRD – CONICET – UBA, Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (IRL 3351 IFAECI), Ciudad Autonoma de Buenos Aires, Argentina;3. CONICET – Universidad de Buenos Aires, Centro de Investigaciones del Mar y la Atmosfera (CIMA), Ciudad Autonoma de Buenos Aires, Argentina;4. Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autonoma de Buenos Aires, Argentina;5. Direccion de Redes de Observacion del SMN C1425GBE, Ciudad Autonoma de Buenos Aires, Argentina;1. Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, 453552, India;2. Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India |
| Abstract: | The construction and analysis of a symmetric rotating field mill is described. Theoretical modelling of the mill's operation successfully predicts the experimentally observed features of the mill output. A pick-up phase signal generated by the mill rotor blades cutting field lines of a permanent magnet was used as a sampling pulse in a sample-and-hold electronic arrangement to determine both magnitude and direction of an impressed electric field. The mill's output voltage regressed on the electric field gave a correlation coefficient of 0.998. The sensitivity of the mill could be set arbitrarily and field changes of 0.5 V/m could be measured routinely. The time constant of 0.3 s makes the mill ideal for studies of the fair-weather field as well as of other phenomena with relatively long time constants. Special steps were incorporated in the mill construction to reduce effectively the damaging effects of water condensation on the performance of the mill. |
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