Focus offset problem This article refers to the address: http:// Due to the different wavelengths of visible light and infrared light, the imaging focus is not on a plane, resulting in clear images under visible light conditions during the day, and blurred under nighttime infrared light conditions, or clear images under nighttime infrared light conditions, and blurred images under visible light conditions during the day. It can be solved in three ways. First, the use of auto-focus integrated camera; second, the use of IR-specific focus does not shift the lens; third, the use of professional adjustment tools, can also achieve non-offset under the existing lens conditions. Color problem All black and white cameras are infrared sensitive. Infrared light is a stray light for color cameras under visible light conditions, which reduces the sharpness and color reproduction of color cameras. The color camera's filters prevent infrared rays from participating in imaging. There are two ways to make the color camera sense infrared. First, switch the filter to block the infrared light from entering under visible light. Remove the filter and let the infrared light enter without visible light. Image quality is good, but the cost is high and the switching mechanism can cause a certain failure rate. Second, opening a specific infrared channel on the filter allows infrared light of the same wavelength as the infrared light to come in. This method does not increase the cost, but the color reproduction is slightly worse. Sensitivity problem Camera sensitivity is a core part of infrared night vision monitoring. The better the sensitivity, the stronger the ability to sense infrared light. Of course, the better the sensitivity, the more expensive the camera is. Generally speaking, the infrared night vision system within 50 meters is better than the camera with 0.1 lux; the night vision system in the range of 50 meters to 100 meters should use the camera of 0.01 lux; the night vision system of 100 meters or more should use 0.001 lux. Above camera. Of course, as the sensitivity increases, the price of the camera will increase significantly. Of course, like many other products, the phenomenon of camera imaginary indicators is particularly serious. I have compared a 0.1 lux camera to a camera with a nominal 0.0001 lux, which is not as good as the former. More camera manufacturers artificially increase the signal strength, the sensitivity is very good, but the signal-to-noise ratio is very poor, resulting in a lot of nighttime image "snowflakes". Distance problem One hundred people will have a hundred infrared night vision distance standards for infrared products. I think it should be based on the customer's application effect. What are the customer's standards? It is to see people! What "visible distance", "discovery distance", these uncertain statements are ambiguous. The matching between cameras and lenses of different grades may be different for the light sensitivity of the same infrared light, and the visual distance may be quite different. Therefore, it is not scientific to say how many meters of a certain infrared light is specifically determined. The distance of the infrared light can only be matched with the camera and lens of certain quality to determine the working distance. Also, because the environment of the application is different, the effect will be very different, and it is best to leave a certain margin. Yageo Capacitors,Yageo Smd Capacitor,Chip Capacitors,Yageo Ceramic Chip Capacitors JINGGANGSHAN MEICHENG ELECTRONIC TRADING CO.,LTD , https://www.meicheng-tra.com
January 02, 2020