Nachtsichtgeräte sammeln und verstärken vorhandenes Licht
durch ihr Objektiv, welches dann durch die Verstärkerröhre bzw. den Bildwandler
geleitet wird. In der Verstärkerröhre wird eine Fotokathode durch das Licht
angeregt und wandelt die Photonen-Energie in Elektronen um. Diese Elektronen
werden innerhalb der Röhre über einem elektrostatischen Feld beschleunigt und
durch eine phosphorisierte Glasfläche geleitet (ähnlich einem monochromen,
grünen TV-Bildschirm) auf der das Bild schließlich erzeugt und abgebildet wird.
1. Front Lens
4. High Voltage Power Supply
2. Photocathode
5. Phosphorus Screen
3. Microchannel plate
6. Eyepiece
WORIN UNTERSCHEIDEN SICH DIE
NACHTSICHT-GENERATIONEN?
Das Hauptunterscheidungsmerkmal von Nachtsichtgeräten ist die Technologie der
Verstärkerröhre bzw. des Bildwandlers.
Generation 1 Geräte der Generation 1
verwenden eine Verstärkerröhre, die vorhandenes Licht verstärkt, in dem Sie
Elektronen beschleunigt und durch eine phosphorisierte Oberfläche leitet,
ähnlich einem Fernsehgerät. Generation 1 Geräte erzeugen eine
Lichtverstärkung, die ideal ist für die meisten Freizeit- und Sportaktivitäten
und ausreichend für viele professionelle
Anwendungsbereiche.
Generation
2 Bildwandler der Generation 2 arbeiten zusätzlich mit einer
Mikrokanal-Platte, welche die Anzahl der Elektronen in der Verstärkerröhre
multipliziert bevor sie auf die Phosphor-Scheibe treffen. Dadurch wird die
Verstärkungsleistung erhöht.
Generation
3 Verstärkerröhren in Generation 3 Geräten erreichen eine
noch höhere Verstärkung durch eine integrierte Galliumarsenid-Fotokathode, die
wesentlich mehr Elektronen erzeugt, als Generation 2 Geräte.
INFRA-RED ILUMINATORS
All Starlight scopes need
some light to amplify. This means that if you were in complete darkness you
could not see. Due to this we have a built in infra-red illuminator (IRI) on all
of our scopes. Basically what an IRI does is throw out a beam of infra-red light
that is near invisible to the naked eye but your NVD can see it. This allows you
to use your scope even in total darkness. The IRI works like a flashlight and
the distance you can see with it will be limited. We do use the most powerful
eye-safe illuminator on the market. This allows our IRI to extend out to 100
yards However, because of the power at a short distance the IRI may cover only
40-60% of the viewing area.
HOW FAR CAN YOU SEE
There are many different
variables that can effect the distance that you can see with a Night Vision
device. First, what are you trying to see? Are you looking for another boat on
the water or are you looking for a rabbit in the woods? The larger the object
the easier it is too see. Plus, are you trying to see details (what we call
recognition range) or are you just trying to see if something is there or maybe
you will just see movement but won't be able to 100% determine who or what it
is. This is called detection range. Second. Another variable is lighting
conditions. The more ambient light you have (starlight, moonlight, infrared
light) the better and further you will be able to see You can always see further
on a night where the moon and stars are out then if it is cloudy and overcast.
We typically state that you can tell the difference between a male and a female
or a dog and a deer at about 75 to 100 yards. However, if you were looking
across an open field and there was a half moon out you could see a barn or a
house 500 yards away. Remember, that the purpose of an NVD is to see in the
dark not necessarily a long ways like a binocular.
BLACK SPOTS ON THE SCREEN
As you look through a night
vision device you may notice black spots on the screen. A NVD is similar to a
television screen and attracts dust and dirt. Typically these spots can be
cleaned. However, this may also be a spot in the tube itself. This is normal.
Most tubes will have some spots in them. These black spots will not affect the
performance or reliability of the night vision device.
Generation
2
Generation
3
All Starlight scopes need
some light to amplify. This means that if you were in complete darkness you
could not see. Due to this we have a built in infra-red illuminator (IRI) on all
of our scopes. Basically what an IRI does is throw out a beam of infra-red light
that is near invisible to the naked eye but your NVD can see it. This allows you
to use your scope even in total darkness. The IRI works like a flashlight and
the distance you can see with it will be limited. We do use the most powerful
eye-safe illuminator on the market. This allows our IRI to extend out to 100
yards However, because of the power at a short distance the IRI may cover only
40-60% of the viewing area. 
There are many different
variables that can effect the distance that you can see with a Night Vision
device. First, what are you trying to see? Are you looking for another boat on
the water or are you looking for a rabbit in the woods? The larger the object
the easier it is too see. Plus, are you trying to see details (what we call
recognition range) or are you just trying to see if something is there or maybe
you will just see movement but won't be able to 100% determine who or what it
is. This is called detection range. Second. Another variable is lighting
conditions. The more ambient light you have (starlight, moonlight, infrared
light) the better and further you will be able to see You can always see further
on a night where the moon and stars are out then if it is cloudy and overcast.
We typically state that you can tell the difference between a male and a female
or a dog and a deer at about 75 to 100 yards. However, if you were looking
across an open field and there was a half moon out you could see a barn or a
house 500 yards away. 
As you look through a night
vision device you may notice black spots on the screen. A NVD is similar to a
television screen and attracts dust and dirt. Typically these spots can be
cleaned. However, this may also be a spot in the tube itself. This is normal.
Most tubes will have some spots in them. These black spots will not affect the
performance or reliability of the night vision device.