The principle and choice of optical lenses

With the advent of Industry 4.0, machine vision systems are becoming more and more widely used in the field of intelligent manufacturing. Cameras and lenses are an important part of machine vision. Suitable cameras and lenses determine the quality of system applications. Therefore, it is very important to choose the purchase large size laser grade MgF2 optics and lens. This article mainly introduces how to choose the right optical lens and corresponding lens. Small hole imaging principle After a beam of light from source A passes through a small hole, a spot is left on the screen behind the hole. Similarly, the light source B will also form a spot on the screen. If A and B are far enough apart, their spots on the screen are also separated far apart, which gives a clearer image of the object AB. Convex lens imaging principle A beam of light emitted by the light source changes its direction and divergence after being refracted by the lens, forming a new intersection point, ie, an image point, on the image plane. [Optical Lens] Structure and Imaging Process The subject collects light through the lens, so that the photosensitive material inside the body (that is, the traditional film, or the ccd, cmos in the digital age) senses the light, and then the image is clearly left by the corresponding photoelectric or chemical reaction. The photosensitive material is stored on the memory card by photoelectric technology. After the light passes through the lens, there is a pentaprism in the fuselage. After the light is repeatedly refracted, the image is restored to positive. As shown below. Optical lens selection steps: Step one, you need to know the system accuracy requirements and purchasing laser grade optical prism resolution first; In step two, it is necessary to know the system speed requirement and the optical lens imaging speed; Step 3, the optical lens needs to be considered together with the image acquisition card, because this involves matching the two; Step four, the price comparison. What should I pay attention to when selecting [Optical Lens]? 1, depending on the application to decide whether you need to choose CCD or CMOS camera. CCD optical lenses are mainly used for image extraction of moving objects, such as placement machines. Of course, with the development of CMOS technology, many placement machines also use CMOS optical lenses. CCD optical lenses are generally used in programs or industries where visual auto-inspection is used. CMOS optical lenses are used more and more widely because of their low cost and low power consumption. 2. The choice of resolution, first consider the accuracy of the object to be observed or to be measured, and select the resolution according to the accuracy. Secondly, look at the output of the optical lens. If it is stereo observation or machine software analysis and recognition, high resolution is helpful; if it is VGA output or USB output, it is also dependent on the resolution of the display and the resolution of the optical lens if it is observed on the display. Higher, the resolution of the display is not enough, it is meaningless; using the memory card or camera function, the high resolution of the sale of custom optical prism assemblies is also helpful. 3. Matching with the lens, the size of the sensor chip needs to be less than or equal to the lens size, and the C or CS mount should also match (or increase the transfer interface); 4. Select the number of camera frames. When the measured object has motion requirements, select an optical lens with a high number of frames. But in general, the higher the resolution, the lower the number of frames.