Facts about the Night Sight.
The AN/TAS-4A Night Sight (Figure 2-1) consists of an afocal
telescope, scanning mirror, detector/Dewar assembly, visible light
optics, and electronic amplification, and control circuits.
When
incorporated into the TOW2 launcher system, the night sight provides
the dual function of a missile-tracking sensor and a gunner's night
sight.
The night sight is an electro-optical system that includes both IR
and visible light optics.
The afocal assembly optics gathers IR
energy and focuses it onto the scan mirror.
Either of two
magnifications may be used.
The IR imager optics (optical imager)
focuses the IR energy from the scan mirror into infrared detectors in
the detector/Dewar.
The detectors convert IR energy to video
signals.
The video signals are processed by the video electronics.
The video is converted to visible light by an emitter assembly (LED
array). The collimator transfers the visible light from the emitter
assembly onto a scan mirror. The objective lens/roof mirror assembly
optics directs this light onto the display reticle for viewing
through the eyepiece optics.
Figure 2-1.
Night Sight Block Diagram.
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