It is said that infrared rays can see through, but the night view of the infrared camera I saw in the dark was nothing. Why?

Ha ha. Just kidding. What do you want to see through infrared perspective? Just kidding.

Let's get down to business.

In order to realize the perspective function, an infrared camera needs to install an infrared filter in front of the lens. There are many infrared filters on sale. Average price 100 yuan or so.

But if you want to realize the perspective function, you need to modify your camera. In order to prevent the perspective from being used by people with ulterior motives, a low-pass filter is installed in front of the CCD. CMOS) camera or video camera. It can be said that the low-pass filter weakens the sensitivity of the photosensitive element. Because the photoreceptor of photographic equipment can sense the color of light that our eyes can't see. With the low-pass filter, we can achieve the goal of shooting. After all, the photos are for us to see. However, criminals can use it on curved roads without installing a low-pass filter. Like seeing through women's clothes or something.

Let me tell you the function of these parts.

Infrared ray: Infrared ray is the invisible light for our eyes. But this kind of light is very penetrating. Clothes that can penetrate certain fabrics.

Photoreceptor: I don't need to say that it is photographic equipment that processes pictures after exposure.

Infrared filter: filter the color of light that our eyes can see. Let infrared light pass through.

Working principle:

Infrared rays penetrate people's clothes. The photosensitive element receives objects transmitted by infrared rays. The infrared filter realizes the conversion of colors invisible to our eyes into colors visible to our eyes. Human skin is firm. Unless strong medical infrared rays are used, it is impossible to penetrate human skin. So the infrared rays emitted by the camera can't penetrate people's skin. Nature can only see the skin. Photosensitive elements capture human skin directly with the help of infrared filters. This is the process of perspective.

Ordinary infrared cameras can see through more or less without disassembling the low-pass filter. But very, very weak. Because the low-pass filter basically filters out colors that our eyes can't see. You can realize the perspective function if you want. You can disassemble the low-pass filter in front of the camera. This is very difficult. Maybe your camera will be scrapped. Think about it.