A4 Refereed article in a conference publication
Simultaneous measurement of particle charge, distance and size using coaxial induction probe
Authors: M Murtomaa, J Salonen
Conference name: Electrostatics
Publication year: 2015
Journal: Institute of physics conference series
Series title: Journal of Physics: Conference Series
Volume: 646
First page : 121
Last page: 127
Number of pages: 4
ISSN: 0951-3248
DOI: https://doi.org/10.1088/1742-6596/646/1/012038(external)
Web address : http://iopscience.iop.org/article/10.1088/1742-6596/646/1/012038/meta(external)
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/2305988(external)
A novel probe for charge measurements was simulated, designed and tested. It consisted of two coaxial induction probes which were grounded via a current sensing circuit. As a charged spherical object passed the probe, data was collected and analyzed using a PC running a program compiled with LabVIEW. Two simultaneous current signals were integrated to obtain induced charges as a function of time. Then, Gaussian curves were fitted to the data and widths and amplitudes were collected for further processing. According to simulations performed with Comsol MultiPhysics, object charge, distance from the probe and size could be calculated using the above mentioned Gaussian peak parameters. The probe was calibrated and tested using induction charged water droplets and frictionally charged insulating spheres.
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