Electronic Amplification and Control Circuits.
Video Chain.
The IR energy (Figure 2-30) from the afocal/cover assembly is scanned
by the mechanical scanner.
The scanner provides the scan and
interlace circuit with position and speed information. The IR energy
is reflected from the scan mirror, and is focused on the cooler-
detector assembly.
The cooler-detector assembly detects variations
in IR energy and generates low-level video signals that are amplified
by video preamplifiers.
Video from the preamplifiers is applied to
video postamplifier control drivers and to postamplifiers in the
postamplifier assembly.
Output signals from the postamplifiers are
applied to the missile guidance set.
Video from the video
postamplifier control drivers is applied to an LED array.
The LED
array produces visible light which is transmitted to the mechanical
scanner; it is transmitted then to the eyepiece for viewing by the
operator.
Contrast (CTRS) and brightness (BRT) controls adjust the video gain
and level.
The video auxiliary control generates two gain commands
and a video gate and level control signal to the video postamplifier
control drivers.
Figure 2-30.
Video Chain.
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MM4812
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