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Noncontact charge measurement of moving microparticles contacting dielectric surfaces
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10.1063/1.2756629
/content/aip/journal/rsi/78/7/10.1063/1.2756629
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/7/10.1063/1.2756629
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic representation of measuring principle: A grounded probe is located at the distance in the electric field of a particle with a charge that is moving with a constant velocity . (b) Qualitative dependency of the induced current on the time of flight for positively or negatively charged particles passing the probe. The change in the sign of marks the time at which the particle position shows the closest approximation to the probe.

Image of FIG. 2.
FIG. 2.

Top: schematic representation of the applied experimental geometry for laser printer toner particles moving in a straight hose. Left column: experimentally determined induced currents. Right column: simulated curves assuming a two particle model with . (a) ; ; ; (b) ; ; .

Image of FIG. 3.
FIG. 3.

Top: schematic representation of the applied experimental geometry for laser printer toner particles moving in a bent hose with two probes. The induced currents at probe 1 in the bend and at probe 2 in the straight region of the hose are shown (left column: experimental data; right column: corresponding simulations). Both model curves were simulated with and the same relative charges and delays of the particles. For and the following approximations were derived from the experimental data: ; .

Image of FIG. 4.
FIG. 4.

Top: schematic representation of the applied experimental geometry for laser printer toner particles reflected at a dielectric wall. The experimentally measured curve of the induced current (left) and the corresponding simulation curve (right) were obtained for a collision of laser printer toner particles with an acrylic glass surface (parameters applied for the simulation: ; ; ; ).

Image of FIG. 5.
FIG. 5.

The induced current at a wire probe experimentally determined during particle motion in a conical tube (left), and corresponding simulated curve (right). The simulated induced current (“resulting current”) is the sum of the induced current of the moving charge (right, normal line) and the induced current resulting from triboelectric charging (right, dashed line).

Image of FIG. 6.
FIG. 6.

Top: schematic representation of the applied experimental geometry for laser printer toner particles moving on a helical path in a cylinder. The data show the measured induced current at the probe for particle movement in an acrylic glass cyclone.

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/content/aip/journal/rsi/78/7/10.1063/1.2756629
2007-07-17
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Noncontact charge measurement of moving microparticles contacting dielectric surfaces
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/7/10.1063/1.2756629
10.1063/1.2756629
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