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How do Night Vision Goggles Work?

time2022/03/22

Night vision devices allow you to see in the dark. With premium night vision goggles and scopes, you can see people, animals and objects up to 1,000 yards away in the dark of night. So how does night vision work?

Night vision devices allow you to see in the dark. With premium night vision goggles and scopes, you can see people, animals, and objects up to 1,000 yards away in the dark of night. Night vision monocular cameras allow you to take photos and videos of things that are invisible to the naked eye in the dark.

There are actually two similar technologies used in night vision devices. Traditional night vision devices use photoelectric image enhancement technology, which works by sensing a small amount of infrared light reflected from an object and then amplifying that photoelectric into a characteristic glowing green image. Newer technology is a digital image enhancement, which captures available light on a digital image sensor and then digitally enhances the image in a full-color display.

Photoelectric image enhancement

Older night vision devices use photoelectric image enhancement technology. The technology uses a series of optical lenses and special electronic vacuum tubes to capture and amplify visible and infrared light reflected by nearby objects.

The first lens in the system is called the objective lens, and it captures the faint visible light reflected from the object, as well as some light from the lower end of the infrared spectrum. This light, like all light, consists of small particles called photons.

These photons enter the image intensifier tube through the objective lens. This is a special electronic vacuum tube, powered by a small AA or N-cell battery, consisting of two components.

The first part of the tube is called the photocathode. This component converts incoming photons into electrons. You may recall from science class that photons, neutrons, and electrons are all very small particles that make up the constituents of atoms. Photons and neutrons combine to form atomic nuclei - electrons that rotate around the nucleus and carry an electric charge.

The newly created electrons flow into the second part of the vacuum tube, called the microchannel plate (MCP). An MCP is a small glass disk
with millions of tiny holes that multiply the number of electrons, thereby amplifying electrical signals thousands of times.

As the electrons leave the end of the image intensifier tube, they hit the phosphor-coated screen. The phosphors on the screen light up when hit, creating a green image that's much brighter than the dim light that initially entered the objective. You can view the phosphor image through the eyepiece, which allows you to focus and magnify the image if necessary.

Why isn't this traditional night vision image in color? It has to do with converting photons into electrons, which strip the color information from the image and convert the raw colored light into a black and white image. Green phosphors were chosen because green is the easiest color to observe in the dark for extended periods of time.

Digital image enhancement

Today, most night vision devices use digital versions of traditional electro-optical image enhancement techniques. Digital image enhancement technology has led to smaller, lighter, and more versatile night vision devices.

With digital night vision, light entering the objective is converted into a digital signal by a complementary metal-oxide-semiconductor (CMOS) sensor, just like the sensors used in digital video cameras. The digital image is then electronically enhanced and magnified several times before being sent to an LCD display for viewing. The larger the CMOS sensor, the higher the resolution of the image you see. Many current digital night vision devices display and record full 1080p HD video.

In addition to direct viewing through an LCD screen, many digital night vision devices can be connected to other devices, such as stills or cameras, for remote viewing. Digital night vision signals can also be stored digitally on an SD card, USB drive, or another storage device. Some digital night vision devices are Wi-Fi capable, making it easy to share and live stream video and images to smartphones, computers, and other devices.

Digital technology has revolutionized the night vision industry. Each generation of CMOS sensors has produced better images at a lower cost. While images from early digital night vision devices are not as detailed as traditional optical images, current-generation devices produce extremely high-resolution displays. Many high-end digital night vision devices can even reproduce color images instead of the old-fashioned glowing green ones.

Application of night vision technology

Night vision technology is used in many types of devices, all designed to enhance viewing in dark or low-light environments.

A scope is a telescopic sighting device used to observe distant objects. Scopes can be freestanding (handheld) or mounted on certain types of firearms, such as rifles. Night vision goggles can be monocular (single eyepiece) or binocular (two eyepieces for stereoscopic images).

Night vision goggles are also popular. Think of these goggles as a pair of binoculars incorporated into a headband or helmet. Because goggles are worn rather than held, they free up your hands for other purposes. They are very suitable for search and rescue generally at night or in dark places, and many static and video cameras use digital night vision technology for night shooting. Night vision cameras are often used for surveillance purposes, especially around the unlit perimeter of buildings.


The use of night vision goggles is now more and more widespread. With the upgrade of technology, everyone is not limited to only wanting to see in the dark environment but also hope to see clearly and keep pace with the times. Welcome to consult us.

Thermeye is a professional thermal imaging camera supplier and manufacturer with more than ten years of experience in researching and manufacturing thermal cores and thermal imaging cameras. We have a strong R&D team, professional technical engineers, and a thoughtful service sales department, from product development, sample production, functional testing to equipment packaging, we are 100% focused on providing products with high satisfaction. Our products are specially developed and produced for different application scenarios. We emphasize product quality, performance, reliability, and make sure everything is safe. Our goal is to make the world a safer place.