Neon principle: In a closed glass tube, it is filled with gas such as helium, neon or argon. The two ends of the tube are equipped with two metal electrodes. The electrodes are usually made of copper material. The electrode leads are connected to the power circuit and equipped with a high voltage transformer. , a voltage of 10-15 kV is applied to the electrodes.
Since the gas in the tube is composed of a myriad of molecules, the molecule and the atom are neutral under normal conditions.
Under the action of high voltage, a small amount of free electrons move toward the anode, and the sharp free excitation of the gas molecules accelerates the movement of the electrons, making the gas inside the tube conductive and emitting a color glow (also known as rainbow light). The color of the neon principle is related to the color of the gas used in the tube and the color of the tube; the neon principle will produce golden light if it is filled with helium in a light yellow tube. If it is filled in a colorless transparent tube, it will emit yellow-white light. . The neon principle is to produce different colors of light, it is necessary to use a number of different colors of light tubes or to load different gases into the neon tube.