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New instrument for tribocharge measurement due to single particle impacts
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View: Figures


Image of FIG. 1.
FIG. 1.

A schematic diagram of impact charging test rig. Dimensions of major parts are as follows: glass tube outer diameter (o.d.), in length; FC1 inner cylinder inner dimeter (i.d.), o.d. in length, outer cylinder o.d. at maximum, in length; FC2 inner cage o.d., in height, outer cylinder o.d., height; target is a triangular prism made of a stainless steel with an impact surface , for example, of impact angle 30°. PI stands for a pressure indicator, and the transducer is basically an analog-to-digital (A/D) converter, which digitize an analog output from the photodetector for the PC.

Image of FIG. 2.
FIG. 2.

A schematic circuit diagram of the preamplifier for the Faraday cages. For FC1, is and is . For FC2, is and is replaced by a CMOS analog switch.

Image of FIG. 3.
FIG. 3.

Typical signals from the Faraday cages recorded on an oscilloscope. (a) No target in FC2; (b) a stainless steel target in FC2.

Image of FIG. 4.
FIG. 4.

An example of the signals from the Faraday cages when a single -lactose particle impacts the stainless steel target.

Image of FIG. 5.
FIG. 5.

Example results of impact charging test with sugar granules (a) and glass beads (b): particle size is , vacuum is against atmospheric pressure, and impact angle is 30° with respect to a target surface.

Image of FIG. 6.
FIG. 6.

Schematic illustration of relationship between impact charge and initial charge based on the results of the sugar granules.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: New instrument for tribocharge measurement due to single particle impacts