More black technology than four-eye night vision device - AN/PVS-21 low light level night vision

When the US military night vision device is mentioned, the first thing that people think of may be the GPNVG-18 four-eye night vision device used by the seals in the action of the Poseidon. And almost everyone thinks that GPNVG-18 is the top-level low-light night vision device of the US military. In fact, the price of GPNVG-18 is the most expensive, but the technical content is also AV/PVS-21.

PVS-21

The Evolution of The PVS-21
The low-light night vision device has evolved from the first generation to the fourth generation. Basically, in addition to imaging clarity, there has not been much progress, especially in the two critical issues of depth of field and field of view. GPNVG-18 mainly solves the problem of field of view through the superposition of 4 night vision devices, but compared with GPNVG-18, AN/PVS-21 low-light night vision device has achieved both depth of field and field of view. Laser holographic projection.

The AN/PVS-21 folding night vision goggles

The PVS-21 is 79 mm long and 200 mm wide, giving a fairly flat feel. Viewed from the front, there are three optical sensors on the left and right, and A is the objective lens. The focal length can be quickly adjusted, and it can be quickly transferred from the observation mode to the melee mode. B is an infrared light-emitting diode, and as an illumination device in the absence of light, there are two energy options, high and low. C is a night vision eyepiece. D turns the close knob for the night vision function. The entire night vision goggles weighed 760 grams, although heavier than the PVS-14 (650 grams), but the soldiers felt lighter than it was installed. In addition, the helmet has a low center of gravity when installed, reducing the burden on the wearer's neck. The AN/PVS-21 also features unique visibility, and soldiers or helicopter pilots can view the scene in front with a direct-view optical system while viewing enhanced images, which are superimposed.

And there are some details about the PVS-21:

• An open state of AN/PVS-21. The objective lens on the left and right sides can be adjusted separately
• The state of the AN/PVS-21 when used: the transparent field of view is +15 degrees to -80 degrees vertically, the level is 165 degrees, and the field of view of the low-light image is 40 degrees. This will ensure observation of the surrounding situation
• The AN/PVS-21 night vision goggles are 79 mm long and front, including the knob portion that protrudes in the middle, and the lens portion is 60 mm long. Shortened the length of the night vision goggles thanks to the use of a folding optical system.
• At the Eurosatory show in June 2012, STS exhibited the AN/PVS21 demonstration of its connection to Raytheon's AN/PAS13C thermal imager with video output port to provide a complete thermal image and micro Light image enhancement overlap effect diagram