Noncontact charge measurement of moving microparticles contacting dielectric surfaces

Journal
Review of scientific instruments  
Volume
78
Issue
7
Article Number
075111
Citation
Review of Scientific Instruments 78 (7): 075111 (2007)
Publisher DOI
10.1063/1.2756629
Scopus ID
2-s2.0-34547557655
ISSN
00346748
In this study examples for a noncontact procedure that allow the description of instant electric charging of moving microparticles that contact dielectric surfaces, for instance, of a flow hose are presented. The described principle is based on the measurement of induced currents in grounded metal wire probes, as moving particles pass close to the probe. The feasibility of the approach was tested with laser printer toner particles of a given size for different basic particle flow and charging conditions. An analytic description for the induced currents was developed and compared to observed effects in order to interpret the results qualitatively. The implementation of the presented procedure can be applied to transparent and nontransparent particle containers and flow lines of complex geometry which can be composed from the presented basic flow stream configurations. © 2007 American Institute of Physics.
DDC Class
600: Technology