Öö nägemine spetsifikatsioonid
As elektronid läbi läbi toru, the aatomid in the tube release similar electrons in numbers that are a factor of the original number of of electrons multiplied by a factor of one (about a few thousand times), and this is accomplished using microchannel plates (MCPs) inside the tube. The MCP is a miniatuur klaas ketas sisaldav miljonid mikroskoopilised poorid (mikrokanalid) made us kiud optika tehnoloogia. Mikrokanal plaat is in a vaakum koos metall elektroodid monteeritud peal mõlemad küljed of ketas. Iga mikrokanal on umbes 45 korda as pikk as see on lai ja töötab nagu an elektroonika võimendi.
When electrons from the photocathode strike the first electrode on the microchannel plate, the electrons are accelerated through the glass microchannels under a high voltage of 5000 volts between the two electrodes. The passage of electrons through the microchannel causes thousands of electrons to be released from the channel, a process known as cascade secondary emission. In short, the original electrons hit the side of the microchannel, and then the excited atoms release more electrons. These new electrons also hit other atoms, creating a chain reaction that results in a handful of electrons entering the microchannel and thousands leaving it. It is interesting to note that the microchannels on the MCP have a slight tilt angle (~5-8 degree ), both to enable electron collisions and to reduce ionic and direct optical feedback from the phosphorescent plasma layer at the output.
At the end of the image intensifier tube, electrons hit a screen with a phophor coating. Need elektronid säilitavad nende suhtelised positsioonid as nad läbivad the mikrokanalid, mis tagab et pilt jääb puutumata sest elektronid on joondatud in the same way as the footonid olid algselt joondatud. The energy carried by these electrons causes the phosphorescent material to reach an exexd state and release footonid. Need fosforid toodavad a roheline pilt on the screen, mis on muutub a eriline funktsioon of öö nägemine seadmed. The green phosphorescent image can viewed through another lens called an okulaar, mis saab kasutada suurendada the image or adjust the focus. NVD saab olla ühendatud to an elektrooniline ekraan seade, selline nagu a monitor, või pilt saab olla vaadata otse läbi okulaar.
