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Principle and Application of Optical Cylindrical Lens products
Optical Cylindrical Lens products should be very familiar to those in the machine vision industry, as lenses are an integral part of machine vision inspection systems. We should also have some understanding of the principle of the lens, and there may also be some observed image deformities in some of our lenses. Let's find out together.
In the machine vision system, the optical Cylindrical Lens products are equivalent to the human eye, and its main function is to focus the optical image of the target on the photosensitive area array of the image sensor (camera). All image information processed by the vision system is obtained through the lens, and the quality of the lens directly affects the overall performance of the vision system. Once the information has been severely lost in the imaging system, it is very difficult to try to recover it in later stages. Selecting an industrial lens and designing an imaging optical path is one of the key technologies of a vision system.
There are many types of optical Cylindrical Lens products, which can be classified into short focal length, medium focal length, long focal length and zoom lens in terms of focal length; in terms of the size of the field of view, they can be divided into wide-angle, standard and telephoto lenses; in terms of structure Classification, can also be divided into fixed aperture fixed focus lens, manual aperture fixed focus lens, automatic aperture fixed focus lens, manual zoom lens, automatic aperture electric zoom lens, electric three variable lens (aperture, focal length, focus these three can be ) and other types.
Optical Cylindrical Lens products have more or less distortion in imaging. Larger distortion will bring great trouble to the visual system, and detailed consideration should be given to this in the imaging design, including selecting a lens with small distortion, and taking only the central field of view with less distortion in the effective field of view. Another characteristic of the lens is its spectral characteristic, which is mainly affected by the interference characteristic of the lens coating and the absorption characteristic of the material. It is required that the light with the highest resolution of the lens should match the light wavelength and the wavelength accepted by the CCD device, and the transmittance of the optical Cylindrical Lens products for this wavelength should be improved as much as possible. Some special effects can be achieved by selecting appropriate filters in the imaging system. In addition, the design of the imaging optical path also needs to pay attention to the influence of various stray light.