How to realize day and night conversion of athermal infrared lens

The athermalized infrared lens heads on the Chinese market mainly use infrared filters to achieve day-to-night conversion, that is, open the filter during the day to block infrared rays from entering the CCD, so that the CCD can only sense visible light; night vision or lighting conditions are not In a good state, the filter stops working and no longer blocks infrared rays from entering the CCD. After being reflected by the object, the infrared rays enter the lens for imaging. However, in practice, infrared cameras often have clear images during the day, but the images become blurry under infrared light conditions. This is because the wavelengths of visible light and infrared light (IR light) are different, and the difference in wavelength will cause the focal position of the image to be different, resulting in virtual focus and blurred images. The IR lens uses new optical design methods, special optical glass materials, and advanced technologies such as special films and materials to eliminate the focal plane shift of visible light and infrared light. The special optical glass material solves the problem of clear imaging of the infrared camera, so that the light from the visible light area to the infrared light area can be imaged at the same focal plane position to achieve a clear image; the special film technology allows the infrared light to be exhausted. Possible to pass through; Multi-layer coating can also suppress the occurrence of ghosts and flashes under backlight conditions to the greatest extent. Even under adverse conditions such as backlighting, it is possible to obtain relatively high-contrast superior images.