In a machine vision system, a good lens is equivalent to having a good eye. A good lens has a good reflection in terms of resolution, sharpness, depth of field, etc. It is also better for correcting various aberrations, but at the same time its price will increase several times or even hundreds of times.
If you master some rules and experience, you will avoid some losses when you set up the system to purchase the lens, so that the system can achieve better results. The following is a brief introduction to the interaction between the parameters of the machine vision lens:
1. The effect of the focal length:
• The smaller the focal length, the greater the depth of field;
• The smaller the focal length, the greater the distortion;
• The smaller the focal length, the more severe the vignetting phenomenon, which reduces the illumination at the edge of the aberration;
2. Effect of aperture size:
• The larger the aperture, the higher the brightness of the image;
• The larger the aperture, the smaller the depth of field;
• The larger the aperture, the higher the resolution;
3. Image center and edge:
• Generally, the image center has a higher resolution than the edge;
• Generally, the image center has higher illumination than the edge light field;
4. Effect of light wave length:
Under the same camera and lens parameters, the shorter the wavelength of the light source of the illumination source, the higher the resolution of the resulting image. Therefore, in a vision system that requires precise size and position measurement, short-wavelength monochromatic light is used as an illumination source as much as possible, which has a great effect on improving system accuracy.
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