In machine vision, industrial cameras are an important accessory. In industrial cameras, the image sensor is the most critical and core thing. The size of the target surface of the image sensor is often directly related to the imaging quality. Generally speaking, the imaging quality of an image is directly proportional to the size of the pixel. This also means that the higher the resolution of the image sensor of the same size, the smaller the pixel size and the worse the image quality.

Just like the industrial 1/2.3’ CMOS sensor, the resolution is usually only at the level of 5 million pixels, while the civilian 1/2.3’ CMOS sensor can achieve a resolution of 16 million pixels or higher. Therefore, the imaging quality of industrial cameras is often better than that of civilian cameras; at the same time, if the camera with the same resolution has a larger sensor area, the larger the area per pixel and the better the imaging quality. For the same 5-megapixel camera, the image quality of a 2/3’ sensor is better than that of 1/2’.

The size of the target surface of an industrial camera, if the requirements are not too strict, you can directly calculate it according to the formula. Usually the manufacturer will tell you how many inches the sensor is, then you can directly use the 16mmX’ sensor to get the diagonal length of the image sensor of the industrial camera. The reason for using 16mm to represent 1 inch instead of 25mm is for historical reasons. You can view related historical documents. In this way, the diagonal of the 1/2' sensor is 8mm. If the aspect ratio of the general sensor is 4:3, then it corresponds to the Pythagorean theorem. The length and width resolution of the 1/2' sensor is 6.4mm and 4.8mm. . In fact, the manufacturer will also tell you the size and resolution of the pixel. The target surface size of the sensor can also be calculated. For example, if a camera has a resolution of 25881940 and 5 million pixels, and the pixel size is 2.2um, the sensor size is 25882.2= 5694um=5.694mm, the width direction is 19402.2=4268um=4.268mm, which is a 1/.25' sensor. Of course, the current sensor pixels are generally square pixels. If they are rectangular pixels, the length of the pixel length resolution and the width of the pixel width resolution can be used respectively. The target surface size calculated according to the latter pixel*resolution is definitely accurate.

Usually, for the sake of trouble and not to calculate, the sizes of several commonly used sensors will be directly remembered. The commonly used sensor sizes are 2/3', 1/2', 1/2.5', 1/1.8', 1/3', 1/4' etc.