Note: at any picture you can click and magnify to 1024 x 768 pix
I was make corona test for three liquid: bidistiled water, tap water, and ethylene glycol.
All conditions are same: repetition rate (17 pps), equal amount of liquid (which mean equal "thickness"
of liquid dielectric in metal test container (pizza cooking tray), distance between anode and liquid surface.
For prevent error in results, I was make all test twice.
Before you look at results, I need to show how simple can be setup, deepness measurement etc.:
 |
 |
| This is whole setup. :o) |
Measuring deepness with 1 mm
drill
tools. :o) |
 |
 |
| Distance of electrode above
liquid is not equal along electrode, but it is obviously at pictures of
results as variations in lightness by looking at pictures. (note: this
is for all tests equal) |
Measuring of equal volume of
liquid for all tests. :o) |
Results of various liquid's corona lightness:
| Bidistiled
water |
Tap water |
Ethylene
Glycol (fluorescence green) |
|
 |
 |
 |
Only corona light |
 |
 |
 |
Piece of photocopier fluorescence paper close to electrode |
 |
 |
 |
Piece of photocopier fluorescence paper far from electrode |
Only by looking at all pictures , you can make evidence that bidistilled water "wins",
which mean, it makes more corona lights than either tap water or ethylene glycol.