thermal photography imaging theory for night vision equipment
The thermal imaging night vision device can produce realistic and clear thermal images in total darkness, mist and smoke. It can be seamlessly connected with wide-screen navigation system and multi-function navigation system. The camera lens can freely rotate 360 degrees horizontally and tilt up and down ±90 degrees, allowing you to experience the sensory enjoyment and security brought by military technology.
Designed to enhance driver vision. The system can output a clear thermal image of the road ahead in severe weather such as dark night, fog and haze, and low human visibility such as headlight glare, effectively improving the driver's visual range.
At the same time, only pedestrian recognition and front vehicle collision alarm functions can detect pedestrians, vehicles and obstacles in advance, greatly improving driving safety.
Thermal imaging night vision device principle:
Thermal imaging is passive infrared, which is based on receiving infrared rays emitted by the temperature (heat energy) of an object. After receiving, it is processed into an image and displayed. Generally, images are gray and white images no matter day or night.
Thermal imaging is not active infrared. The thermal imaging night vision device itself does not send out infrared rays, but only receives infrared rays from the outside world. Therefore, it is easy to conclude that as long as thermal imaging can receive infrared rays emitted by objects, there will be image output. , Conversely, if it cannot receive infrared rays, it cannot reflect the image of the object we want to see.
So now some of the questions we all ask, such as: whether thermal imaging can see through, pass through walls, see people and objects in the car, pass through glass, etc., have certain results.
If you pass through a wall or glass, the wall blocks the infrared rays, and the thermal imaging night vision device cannot receive infrared rays at all, and cannot detect objects on the other side of the wall and glass. That is to say, if there is an image to come out, there must not be all sealed objects that block all the infrared rays, otherwise the infrared imaging will definitely not be received.
In some environments such as trees and grass, because the infrared is not completely blocked, thermal imaging can still find objects with a higher temperature than plants behind. For example, there are people and animals behind the grass and trees. Obviously, there is a temperature difference. Things with high temperature will be brighter, and objects with low temperature will be darker.
Thermal imaging is actually temperature difference imaging. Objects with high temperatures emit stronger infrared rays, while objects with lower temperatures emit relatively weaker infrared rays.
When people walk behind the glass, they cannot see the image of the person. That is because the glass blocks the infrared rays of the people outside. The thermal imaging night vision device cannot receive infrared rays, so it cannot show the person in the image.
2 people stand inside, there are people in the image, and there are people on the glass, that is because the human infrared is received by human thermal imaging, and there are people on the glass because the human infrared is emitted to all sides, and the infrared emitted by the glass It was reflected by the glass and received by the thermal imaging night vision device, so we can see the image of someone on the glass.
When people wear clothes, most of the infrared is blocked by the clothes. The body part is darker because the temperature of the clothes is much lower than that of the human head. The head with high temperature is brighter, and the clothes with low temperature are darker.
At this time, someone put 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 there was the temperature of the palms. In seconds, the palm prints disappeared. It was because the temperature of the palms on the clothes slowly dissipated and disappeared.
