When used with firearms, an IR laser sight is often mounted to the user's weapon. Night vision devices can be handheld but many are head-mounted and attach to helmets. Night vision devices may be passive, relying solely on ambient light, or may be active, using an IR (infrared) illuminator to better visualize the environment. The image produced by an NVD is typically monochrome green, as green was considered to be the easiest color to look at for prolonged periods in the dark. objective lens) on NVDs to protect the latter from damage by environmental hazards and some can incorporate telescopic lenses. Many NVDs also include a protective sacrificial lens, mounted over the front lens (ie. A night vision device usually consists of an image intensifier tube, a protective housing, and may have some type of mounting system. By comparison, viewing of infrared thermal radiation is referred to as thermal imaging and operates in a different section of the infrared spectrum. The device enhances ambient visible light and converts near-infrared light into visible light which can be seen by the user this is known as I 2 ( image intensification). Note that in addition to the image intensifier, the NVD gathers much more light by its much larger aperture A 1PN51-2 night-vision reticle with markings for range estimation First person view through night-vision goggles of the FBI Hostage Rescue Team using an airboat.Ī night-vision device ( NVD), also known as a night optical/observation device ( NOD), night-vision goggle ( NVG), is an optoelectronic device that allows visualization of images in low levels of light, improving the user's night vision. The effect on the natural night vision of the eye is evident A standard telescopic sight augmented with a night-vision device in front on the M110.
( October 2021) ( Learn how and when to remove this template message)Ī US Navy aviator uses a pair of helmet-mounted AN/AVS-6 vision goggles. Please help improve this article if you can. The specific problem is: Likely more organized to weave US generation classification with non-US technological analogues, as done on the Russian Wikipedia page. This article may require cleanup to meet Wikipedia's quality standards.
0 kommentar(er)
