The working principle of night vision equipment

When you see the word night vision, what comes to mind first? Perhaps you may wonder, are these things really useful, can you really see the target in the dark?

The answer is yes. With appropriate equipment, you can see targets 200 yards away in the dark, providing you with light in the dark.

Today we will take you through various types of night vision devices and applications.

At present, night vision devices are mainly divided into three categories, namely active infrared night vision devices, thermal imaging infrared devices, and low light night vision devices.

The working principle of an active infrared night vision device is to use photoelectric conversion technology to illuminate the emitted infrared beam towards the target, and then convert the infrared image reflected by the target into a visible light image.

Although it is pitch black at night, there is still weak light. Infrared night vision devices can convert these unclear lights into clearer and richer images, which are often used in military, customs, border defense, and night patrols.

Thermal imaging infrared instrument is also known as infrared instrument. The working principle of a thermal imager is to convert the infrared radiation from an untitled surface into a visible image by the temperature difference between the heat emitted by the untitled surface and the background. Hesitation thermal imagers also have the function of temperature measurement, which can use the characteristics of surface temperature distribution of objects to pseudocolor code grayscale images. Simply put, it converts the invisible infrared energy emitted by objects into visible thermal images.

Different colors represent different temperatures of the tested object, and the thermal imager is not affected by obstacles such as smoke and trees, making it the most advanced night vision observation device currently mastered by humans. Due to the high cost of thermal imagers, they are currently only commonly used in military applications.

The "low light" in the low light night vision instrument, also known as night sky light, is the natural light in nature, and its imaging mainly relies on components like enhancers. When weak natural light shines on the surface of the target, an image intensifier can enhance the weak target, and the enhancement ability can even be magnified to hundreds of thousands of times. In other words, a low light night vision instrument is a special telescope with its own intensifier. Nowadays, they are the most courageous in fields such as military criminal investigation and night surveillance.