Noncontact charge measurement of moving microparticles contacting dielectric surfaces.
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.
German Cancer Research Center, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.
Alexander
A
Nesterov
Felix
F
Löffler
Kai
K
König
Ulrich
U
Trunk
Klaus
K
Leibe
Thomas
T
Felgenhauer
Volker
V
Stadler
Ralf
R
Bischoff
Frank
F
Breitling
Volker
V
Lindenstruth
Michael
M
Hausmann
D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods; D008863:Microspheres; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055672:Static Electricity; D013499:Surface Properties