FUNCTIONING OF AN/PAS-6
b. The front screen of the image tube converts
the infrared image into a pattern of emitted elec-
trons. The electrons are accelerated and focused
The light source is basically an infrared flash-
on a phosphor layer on the rear screen of the
light. Two 1.5 volt batteries supply power for
tube. The phosphor screen then converts the elec-
the lamp. Light from the lamp is formed into
tron image into a visible image.
a beam by the reflector. The infrared filter
blocks the visible light and passes only the in-
c. The eyepiece magnifies the visible image
displayed on the rear screen of the image tube.
d. The housing contains the corrector lens
which provides uniform focusing of the objec-
The metascope consists of an objective lens, im-
tive lens by correcting for the curved surface of
age tube, eyepiece, housing (containing the cor-
the image tube front screen.
rector lens), and a high voltage power supply,
e. The high voltage power supply converts the
a. The objective lens focuses an infrared im-
1.34 volt battery output to 12,000 bolts dc to be
age of the scene being viewed on the front screen
of the image tube.
used as accelerating voltage for the image tube.