The imaging principle of a thermal night vision device
Thermal imaging night vision devices can produce realistic and clear thermal images in all black, thin fog, and smoke conditions. It can seamlessly connect with widescreen navigation systems and multifunctional navigation systems. The camera lens can freely rotate 360 degrees horizontally and pitch up and down ± 90 degrees, allowing you to experience the sensory enjoyment and safety guarantee brought by military technology.
Designed to enhance the driver's visual ability. The system can output clear thermal images of the road conditions ahead in harsh weather conditions such as all black nights, haze, and low visibility due to glare from headlights, effectively improving the driver's visual range.
At the same time, the pedestrian recognition and front vehicle collision warning functions can detect pedestrians, vehicles, and obstacles in advance, greatly improving driving safety.
Principle of thermal imaging night vision device:
Thermal imaging is passive infrared, which relies on receiving the infrared radiation emitted by the temperature (thermal energy) of an object. After receiving it, it is processed into an image for display. Generally, the image is grayish white regardless of day or night.
Thermal imaging is not active infrared. The thermal imaging night vision device itself does not emit infrared rays, but only receives a specific range of infrared rays. Therefore, it is easy to draw the conclusion that as long as the thermal imaging can receive the infrared rays emitted by the object, there will be an image output. Conversely, if the infrared rays cannot be received, it cannot reflect the image of the object we want to see.
So the questions we are all asking now, such as whether thermal imaging can provide perspective, penetrate walls, view people and objects inside the car, and penetrate glass, have yielded certain results.
If you pass through walls or glass, the wall blocks the infrared rays, and the thermal imaging night vision device cannot receive the infrared rays at all, unable to detect objects on the other side of the wall and glass. That is to say, if there is an image, it must not be completely blocked by sealed objects, otherwise infrared imaging will definitely not be received.
In environments such as trees and grass, thermal imaging can still detect objects behind them that are hotter than plants due to not completely blocking the infrared radiation. If there are people and animals behind the grass and trees, it is obvious that there is a temperature difference. Objects with high temperatures will light up, while objects with low temperatures will be darker.
Thermal imaging is actually temperature difference imaging. Objects with high temperatures emit stronger infrared radiation, while objects with low temperatures emit relatively weaker infrared radiation.
When a person walks behind the glass, they cannot see the image of the person because the glass blocks the infrared rays of the person outside, and the thermal imaging night vision device cannot receive the infrared rays, so it cannot display the person in the image.
Two people stand inside, with a person in the image and a person on top of the glass. This is because the infrared of the person is received by human thermal imaging. In addition, there is a person on the glass because human infrared is emitted in all directions, and the infrared emitted on the glass is reflected back by the glass and received by the thermal imaging night vision device. Therefore, we can see the image of a person on the glass.
When a person is wearing clothes, most of the infrared rays are blocked by the clothes, and the body parts are relatively black because the temperature of the clothes is much lower than that of the head. The head with higher temperature is brighter, while the clothes with lower temperature are darker.
At this point, someone placed two palms on the clothes for 2 seconds, and we found that there were two palms printed on the clothes. That is, the temperature of the palms was transmitted to the clothes, and the temperature of the palms slowly disappeared after 2 to 3 seconds. That is, the temperature of the palms on the clothes slowly dispersed and disappeared.
