How neon lights work
When the external power circuit is turned on, the output of the transformer will generate a high voltage of several thousand volts or even tens of thousands of volts. When this high voltage is applied to the electrodes at both ends of the neon tube, the charged particles in the neon tube are accelerated in the high-voltage electric field and fly to the electrodes, which can excite a large number of electrons. These excited electrons are accelerated in a high-voltage electric field and collide with the gas atoms in the lamp tube. When the energy of these electrons colliding with the free gas atoms is large enough, the gas atoms can be ionized to become positive ions and electrons. This is the gas ionization phenomenon. When the charged particles collide with the gas atoms, the excess energy is emitted in the form of photons, which completes the entire process of the neon light.
① Most neon lights use cold cathode glow discharge. When the cold cathode is working, the whole lamp basically does not generate heat, and the efficiency of converting electric energy into light energy is high. Its life span is much longer than that of ordinary fluorescent lamps. For example, the quality can be guaranteed from materials, processing to installation. The life span of neon tubes can be as high as 2ooooh -3ooooh, which is not lower than zaooha cold cathode discharge lamps in my country’s local standards. A great advantage is that the number of switching times basically does not affect its life, so it is especially suitable for advertising lamps that need to be switched on and off frequently.
②It relies on positive ions bombarding the cathode to make the cathode emit secondary electrons to maintain the discharge. Therefore, a certain cathode potential drop is required to provide energy for the acceleration of the positive ions.
③In order to ensure the discharge in the normal glow discharge area and no large cathode sputtering occurs during operation, the cathode needs to have a large enough area, otherwise the cathode current density will exceed the cathode position due to the large current flowing. Decrease and increase, become abnormal glow discharge, aggravate the cathode sputtering and shorten the life of the lamp tube.
④When possible, the neon tube should be as long as possible, with a smaller inner diameter, and try to increase the ratio of the pressure drop in the positive column area to the total pressure drop of the tube to improve the light efficiency.
⑤In order to ignite the neon tube smoothly and work stably at a lower voltage, a high-voltage transformer must be equipped (mostly magnetic leakage type, but because it is bulky and consumes a lot of power, it will gradually be replaced by electronic type) and make reasonable matching to save engineering cost .
⑥ The neon lamp uses alternating current to work, so the two electrodes alternately serve as the cathode and the anode, and the area distribution of its glow discharge also alternates in sequence direction. Due to the persistence of human vision, it can be seen that the glow is evenly distributed throughout the tube. The luminous effect is much more ideal than using direct current. Therefore, the two electrodes should be as consistent as possible from material to processing.
⑦Because the neon lamp is a vacuum electric light source, it is necessary to pay attention to vacuum hygiene during the whole production process. The materials and production are strictly in accordance with the technical requirements of electric vacuum, so as to ensure the quality.
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