The working principle of the infrared camera is that when the light is dark, the infrared light is turned on by the photosensitive device, and the light emitted by the infrared light is reflected by the object and then the object is imaged. Therefore, when selecting the infrared camera, the infrared distance must be selected. . Now some manufacturers of infrared cameras can be used for daytime image effects, but after the evening, a white aperture will appear in the center of the monitored image, and the objects in the middle are almost invisible. The main reason for this problem I personally think is the reflection of the infrared lamp itself. However, backlight compensation is also an internal reason. Therefore, as long as the production process and technology more research, strict product quality, the problem can be solved.
A white aperture appears in the center of the infrared camera screen. It is the angle of the LED that does not match the lens. The 4 mm lens with a narrow angle LED is sure to have a white circle in the center. If you pack it with high power and big particles, it will appear sweet. Circle effect, because most of the infrared camera, infrared camera board is bought, even if they do, it is also done in accordance with the program to buy, adjust the backlight compensation, AGC, AES settings will not, also Some of them are even ready to buy LED panels, no one knows how many angles, how to collaborate with the camera, and some even when the machine is not equipped with a dark room, even the test did not go out.
If the infrared camera is normal during the day and the whole day is white at night, the problem is even greater. It is because of overheating. If the CCD exceeds 80 degrees Celsius, the dark current will start to increase, and the white background will be pulled up. White, otherwise it is grayscale is not normal, looks like a ghost film effect, and then go hot, CCD hanging point, especially the so-called outdoor long-range infrared camera, after a few months, it is easy to be a white night Awkward. If the sun shield is too convex and a wide-angle LED is used, the infrared light that is thrown out is bounced back by the sun shield and white fog will be produced. Even with special infrared waterproof glass. And lens processing is also useless, and if the lens casing just find a rubber trap, it will leak light, white fog and ran out. When it comes to moisture, the lens is blurred, how can the picture be clear? Add a dry bag, or fill with nitrogen, not too much to support a month. In short, infrared cameras, too easy to do, want to do good and too difficult.