Machine vision is a dynamic field: STEMMER IMAGING and our suppliers are the world´s leading manufacturers for machine vision components and solutions, introducing many brand new developments several times a year.
Ruggedised versions of the MPW2 series of C-mount 5 Mpixel ultra-low distortion machine vision lenses have been introduced by Computar. The new MPW2-R Series of lenses is designed specifically to withstand strong shocks, vibrations and huge variations in temperatures in demanding factory automation environments.
The new Dimension range of lenses from Zeiss has been designed for precise high-end applications, where distortion, vignetting and colouring issues must be minimised. Developed specifically for C-mount cameras, these new lenses provide high contrast, razor-sharp images, even at maximum aperture. They are virtually distortion-free across the entire area of sensors up to 4/3” and can resolve pixel sizes down to 2 μm.
A new, wide angle lens with a focal length of 25 mm has been added to the Zeiss Interlock range of compact, lightweight lenses. These are designed for use with large format area and line scan cameras. The full metal housing, locking screws for focus and aperture and their resilience to dust, water and vibration make these lenses ideally suited to use in very harsh industrial environments.
High accuracy machine vision applications are dependent on the production of reproducible, high quality images, whether for inspection or measurement purposes. This means that the images must have sufficient resolution and proper definition of the areas of interest for the inspection or measurement to take place. Each element of a machine vision system has an important role to play in the overall outcome, but the optical system is a critical component since it forms the image of the object on the camera sensor.
The versatile Vico DTCM series of bi-telecentric lenses are designed for high accuracy machine vision measurements. The modular design allows object side and image side lens components to be combined into more than 200 specific lenses to meet an enormous range of imaging requirements.
All machine vision systems rely on the production of an image of sufficient quality to allow the required measurements to be made. Clearly the lens or lens combinations used in the vision system play a crucial role in determining the quality of the image produced. It has an impact on many other factors as well: These include the speed that can be achieved, measuring accuracy, and the reproducibility and reliability of the downstream analysis. Although fixed focus lenses are available, most lenses for machine vision applications are manufactured with metal housings and focus mechanisms.
Optics and illumination play a critical role in optimising the imaging conditions for machine vision measurement. Even the seemingly simple act of adjusting the iris (aperture) of a lens affects several parameters in the imaging system. There are a number of ways of adjusting the iris, but the Precise-iris (or P-iris) method offers significant benefits.
Tamron has introduced a range of compact (29 mm diameter) fixed focal length lenses that support 5 Mpixel resolution for 1/1.2” image sensors. The small diameter makes these lenses ideally suited to use with the latest ultra-compact cameras in situations where space is limited. The excellent resistance to shock and vibration as well as their metal mounts and components offer the ruggedness required in factory automation applications.