VL Series


High-performance and Cost-effective Line Scan Cameras


Comparison of the spectral quality of three Cubert hyperspectral video cameras. For each camera the spectra of the red, green and yellow samples are shown along with the respective noise indicating standard deviation (left). Image comparison of the three hyperspectral video cameras Firefleye~Q285, Buttefleye~X2 und Ultris~Q20. For each camera an RGB image (true colour) and two vegetation indices (hNDVI and RedEdge) are shown (right)


C Each lens element must be free of imaging


errors and aberrations, to guarantee signal quality. Finally, it must transmit a high proportion of the light that enters. ‘In pushbroom imaging applications objects are moving quite fast,’ Lange said. ‘You’ve got to be able to pick up a lot of light. You have to have a high transmission, high speed lens, with an f number around f/2 or f/2.8.’


Industrial imagers Systems that can deliver such capabilities can see and identify chemically different materials and objects, echoed Timo Hyvärinen, co-founder and sales manager at Specim Spectral Imaging in Oulu, Finland. He believes hyperspectral imaging is becoming a key vision technology in applications solving global challenges. Tese include recycling and waste management processes, reduction of food waste and monitoring the environment. But spectral signatures can appear in different spectral regions. Colour is obviously visible, but vegetation stress and species identification happen in the visible-near infrared and chemical imaging in near and longer infrared. Hyvärinen said: ‘As a hyperspectral


imager should optimally operate across a large spectral range, its optical design benefits and can be simplified by clever use of different optical materials and combination of refractive and reflective components. High performance across a broad spectral range is a key criterion for anti-reflection coatings, and in the case of


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reflective optics, for protective coatings, too.’ Optical design for different spectral


regions also requires tailored optical materials and coatings, added Hyvärinen. ‘As another example, optical design for industrial and drone-based cameras is more cost critical than design for high resolution aerial mapping,’ he said. Optical design and choice of detector


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array are key areas in hyperspectral imaging, Hyvärinen said. ‘Tere are more optical performance parameters to be optimised than in traditional red/green/blue or greyscale imaging,’ he said. ‘Optical design influences light transmission and collection efficiency, image sharpness, uniformity and aberrations that need to be maximised or optimised across the broad spectral region typically targeted in a hyperspectral imager.’ Specim produces hyperspectral


pushbroom line scan cameras. ‘Tose designed primarily for industrial on- line applications run at hundreds to a thousand line images per second with full or configured spectral band sets and a very high light collection efficiency of f/1.7,’ Hyvärinen said. His company matches optical design to the detector pixel size by meeting the Nyquist sampling criteria, specifying that the optical spot is twice the size of the detector. Tis minimises internal aberrations to sub-pixel level, which don’t need to be corrected for in data processing. In this way, Specim’s FX series


hyperspectral cameras were the first to meet industrial machine vision requirements for performance, compact rugged construction


g vision@vieworks.com


Vieworks’ VL Series, first launched in 2014, has been reintroduced in 2020 to meet customers’ needs for more powerful fea- tures but still at an affordable price. The two models, VL-8K and VL-16K, each presents high reso- lution of 8k and 16k; fast speed of up to 80kHz and 40kHz, respectively. The cameras are applicable for flat panel display inspection, printed circuit board inspection, and docu- ment scanning. Please meet our new VL Series right now at vision.vieworks.com.


VL-8K / VL-16K


Cubert


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