Popularization of knowledge of fixed focus industrial lens parameters




With the rapid development of industrial automation in recent years, machine vision solutions have been used more and more in the fields of detection, positioning, feature recognition and data acquisition in various industries. Machine vision solutions consist of industrial cameras, industrial lenses, light sources, images The processing system and other components, suitable industrial cameras and lenses determine the quality of machine vision imaging. There are various categories of industrial lenses. This article mainly introduces the parameters of fixed focus industrial lenses to help better selection.



Detailed explanation of the parameters of the fixed focus industrial lens



Focal length: This parameter is the main parameter of the fixed-focus industrial lens, which is closely related to the working distance of the image acquisition system. The longer the focal length, the longer the required working distance. Generally speaking, the working distance depends on the installation space of the equipment.



Aperture range: Aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface of the fuselage. It is usually in the lens. For the lens that has been manufactured, we cannot arbitrarily change the lens of the lens, but it can be used in the lens. A polygon or circle is added inside the lens, and an aperture grating with a variable area is used to control the amount of light passing through the lens.



Resolution: Refers to the resolution of the lens, which is related to the imaging quality of the lens. In actual selection, you only need to choose a lens that is close to the resolution of an industrial camera.



Interface: refers to the connection method between the industrial camera and the lens, commonly used include C, CS, F, V, etc. The interface selection of the lens can be the same as that of the camera. For example, if the camera is a C-mount, then the lens should choose a C-mount. If the camera is a CS-mount, you can choose the CS-mount or convert it to a C-mount through the conversion ring.



Maximum sensor size: refers to the maximum sensor size of the industrial camera that can be adapted. When selecting, the optical size of the lens should be greater than or equal to the optical size of the industrial camera sensor.



Field of view: The field of view is the larger angle that light can pass through the lens. The longer the focal length, the smaller the field of view. When the same industrial lens is used with cameras with different sensor sizes, the field of view is different but The only thing is that we usually know the field of view range and working distance to be observed in the project. After determining the optical size of the industrial camera, we can calculate the field of view angle. When selecting an industrial lens, we only need to select a close field of view angle. That's it.



In the process of building a machine vision solution, the applicability of each component needs to be considered. For more information, you can consult Pomeas to provide you with a one-stop machine vision solution.



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