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10. ट्यूब लाइट की प्रक्रिया
ट्यूब लाइट में किस प्रकार प्रकाश पैदा किया जाता है, इस विषय में इंटरनेट से उपलब्ध सामग्री को यहां मूल अंग्रेजी में प्रस्तुत किया जा रहा है तथा इसका अनुवाद दिया है । इसी के साथ फ्लोरेसेंट लाइट, निओन लाइट आदि में क्या अन्तर है, यह भी स्पष्ट हो रहा है।
"A neon light is the sort of light you see used in advertising signs. These signs are made of long, narrow glass tubes, and these tubes are often bent into all sorts of shapes. The tube of a neon light can spell out a word, for example. These tubes emit light in different colours. A fluorescent light, on the other hand, is most often a long, straight tube that produces white light. You see fluorescent lights in offices, stores and some home fixtures. The idea behind a neon light is simple. Inside the glass tube there is a gas like neon, argon or krypton at low pressure. At both ends of the tube there are metal electrodes. When you apply a high voltage to the electrodes, the neon gas ionizes and electrons flow through the gas." These electrons excite the neon atoms and cause them to emit light that we can see. Neon emits red light when energized in this way. Other gases emit
other colours.
A fluorescent light works on a similar idea but it has an extra step. Inside a fluorescent light is low-pressure mercury Vapour. When ionized, mercury Vapour emits ultraviolet light. Human eyes are not sensitive to ultraviolet light (although human skin is - see How Sunburns and Sun Tans Work). Therefore, the inside of a fluorescent light is coated with a phosphor. A phosphor is a substance that can accept energy in one form (for example, energy from a high-speed electron as in a TV tube How Television Works) and emit the energy in the form of visible light. In a fluorescent lamp, the phosphor accepts the energy of ultraviolet photons and emits visible photons.
- see
The light we see from a fluorescent tube is the light given off by the phosphor that coats the inside of the tube (the phosphor fluoresces when energized, hence the name). The light of a neon tube is the coloured light that the neon atoms give off directly."
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