Ramsey Electronics PG13 Manual de Instruções descarregar pdf (Página 9)

IG7 Page 9

The diagram below shows a conductive tear-shaped object with a high volt-

age field around it. The lines are called equipotential lines and they indicate

our voltage gradient potential as we mentioned before. A rounded tip will dis-

perse the gradient over a larger area than that of a sharp tip. Notice below that

the gradient on a rounded tip isn’t very steep while the sharper tip is. In actual-

ity, the sharper the tip the steeper the gradient is; also the distortion in the gra-

dient lines makes it easier to “bleed” off ions into the air. The bleeding off of

ions is called the corona effect.

Rounded Tip Gradient Sharp Tip Gradient

To estimate how concentrated and electrical field will be around a given

shape and determine how good of an insulator or conductor to the air it is in-

volves a little geometry. You can draw tangents to the curved surface at inter-

vals of say 10 degrees of arc. Remember what a tangent to an arc is? It is a

line that only intersects at one point on the arc and is at an exact right angle to

a line drawn from the center of the arc to the tangent (also called the ray). A

slow smooth arc, like the right hand side of the diagram, involves very few tan-

gents at 10 degree intervals. A sharp point would need many. If you look at

the previous diagram, you can see that the sharp points’ angle looks to be

around 315 degrees from the outside when we figure the metal is 45 degrees

of angle or so. This would take 315 / 10 = 31.5 tangential lines to reproduce.

The entire rest of the surface would only need the remaining 45 degrees or

45 / 10 or 4.5 tangents.

If you went in microscopically and looked at a well sharpened tip, it would

not appear to be as sharp as you may think. Ideally you would like to have a

perfectly sharp tip, but that is unlikely. When we make our ion wind generator,

you will be able to see the effect of a very sharp tip vs. a dull one rather well.

Air Ions and their effects

Ions have always been touted as being one of the best methods of cleaning

the air of dust and pollen as well as stimulating the cilia in your lungs to accel-

erate the removal of foreign debris. This tends to be a little more complicated

than simply generating ions.

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Ramsey Electronics PG13 Manual de Instruções Página 9