Abstract
This paper discribes a new method to change luminons color of a positive column ofa low pressure Hg-Ne discharge lamp.
Pulses of triangle wave form, whose width, rise time and recurrence frequency had been changed widely, mere applied to discharge lamps of 10 cm in interelectrode distance and from 1 cm to 5 cm in diameter.
The color of the positive column could be controlled electronically from blue to red by varying pulse rise time only, heving kept pulse voltage, pulse width and pulse recurrence frequency constant.
In general, when the pulse rise time is shorter than 10 μs, the color is red and, on the contrary, it is blue when the rise time is longer than 150 μs.
The optimun recurrence frequency, at which the change of color from red to blue and vice versa is favorable by varying only the pulse rise time, has such a relation with diameter of discharge lamp that f =210/ (2R) Hz and is insensitive to change of the pulse width.
