A tubular coil is the most common type of plasma lamp used in museums, nightclubs, movie sets, and other apps where the looks may be interesting for entertainment. Such a device consists of a double walled glass tube with a hollow center. The cavity between the inner and outer glass tubes is filled with thousands of small phosphor coated glass beads. The 5-14 kV transformer sends very low power, high-frequency electrostatic discharge into the manic cavity, producing light filaments that simulate lightning. The coil tube gets their name not because of the sound they produce but because of the appearance of their internal behavior. The "lightning" (filament or ribbon) is forced around and between phosphor coated glass beads, due to the dielectric nature of the beads'. Thus, phosphorus is attracted by electrical energy and fluoresces to produce visible light. Like a plasma ball, the crackle tube responds to touch; the filaments appear to "gravitate" toward the point of contact and usually become brighter (brighter) because of the electricity on the ground. The tubes are also filled with noble gases like neon, argon, or xenon which act as the electron transfer medium of the cavity. Gas is usually kept only slightly above atmospheric pressure.
Typically, crackle tubes are cylinders in geometry, however, they can be made into almost any solid shape, even flat plates (trademarks under the name "Luminglas"). Filaments can also be made for any color by combining various chemicals with alkaline phosphors. The chemicals used to produce blue filaments are also responsive to ultraviolet light. UV light may have something to do with how phosphorus is attracted by the ESF (electrostatic field). The filaments themselves can change color as they progress along the tube. These effects are made by using glass beads with different chemical coatings on them, and the color of the filaments changes with the ESD transition from one color layer to another. The chemical layer can also be incorporated into a single layer, allowing the crackle tube to have multiple simultaneous filaments of several different colors.
The crackle tube looks white when viewed in a dead state under normal lighting conditions. Their luminosity, or light intensity, depends on several factors, but generally the crackle tube is not too bright when compared to fluorescent light or incandescent lamps. However, they are quite bright compared to similar devices. However, they are best seen in the dark. Their transformers can also be connected to an acoustic modulator, allowing the tube to 'respond' to music or environmental noise.
Video Crackle tube
See also
- Plasma (physics)
- List of light sources
- Plasma ball
Maps Crackle tube
References
Source of the article : Wikipedia
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