Simultaneous measurement of particle charge, distance and size using coaxial induction probe

Electrostatics 2015

物理学;数学

Murtomaa, M.^1 ; Salonen, J.^1

Department of Physics and Astronomy, University of Turku, Turku

20014, Finland^1

关键词: Charge measurements;    Comsol multiphysics;    Current-sensing circuits;    Function of time;    Induced charges;    Induction probes;    Simultaneous measurement;    Spherical objects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/646/1/012038/pdf
DOI  :  10.1088/1742-6596/646/1/012038

来源: IOP

【 摘 要 】

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.