op92oppi
Dołączył: 16 Lut 2011
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 Wysłany: Pią 4:29, 11 Mar 2011 Temat postu: Photoelectric Technology Radiation Protection |
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Radiation Protection
Photoelectric Technology
Photoelectric technology smoke alarms use a T-shaped chamber fitted with a light-emitting diode (LED) and a photocell. The LED sends a beam of light across the horizontal bar of the chamber. The photocell sits at the bottom of the vertical portion of the chamber. The photo cell will generate a current, when exposed to light.
The diagram below illustrates how the technology works. Under normal, smoke-free conditions, the LED beam moves in a straight line, through the chamber without striking the photo cell. When smoke enters the chamber,[link widoczny dla zalogowanych], smoke particles deflect some of the light rays, scattering them in all directions. Some of it reaches the photocell. When enough light rays hit the photocell, they activate it. The activated photocell generates a current. The current powers the alarm, and the smoke alarm has done its job.
Photoelectric Smoke Alarm Technology smoke free chamber
light beam travels straight through; smoke particles in chamber
deflect some light rays light
emitting
diode
activated
photocell
powers alarm no light reaches photoelectric cell deflected light rays
activate photocell
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