3B Scientific Teltron Luminescence Tube S - Manual (Page 3)

3
5.3 Phosphorescence and quenching
• Remove all connecting leads from the tube
(refer to fig. 3).
• Set up a ultra-violet light source so that the
gun side of the screen can be illuminated.
• Set up a infra-red light source so that the
backside of the screen can be illuminated.
• Illuminate the phosphors with ultra-violet
light until the green phosphor has built up to
full intensity.
• Switch off the ultra-violet light source and im-
mediately switch on the infra-red light source.
The phosphorescence of the unprotected half of
the green phosphor is quenched while the other
half remains unaffected.
DC POWER SUPPLY 0 ... 5 kV
0
1
2 3
4
5
KV
0 ... 5 kV
U
F
U
A
Fig. 1 Excitation by cathode ray bombardment