3D VISION
Spectral and MEMS takes 3D in new directions
Greg Blackman speaks to two young companies with some novel 3D imaging approaches
A
blessing and a curse of 3D imaging is that there are so many ways to do it. Triangulation, stereovision,
structured light, time-of-flight, the list goes on, with numerous variations on those themes. Tis means there’s normally a 3D vision technique that will meet the application requirements – if 3D is necessary in the first place – but that choosing the right method requires a certain degree of knowledge. Using 3D vision can actually simplify
inspection if implemented correctly, as noted by vision experts in the article on page 24, and there are now self-contained sensors designed to make using 3D vision easier. Tis doesn’t mean though that all applications can be solved with the existing solutions, or that there’s no room for innovation in 3D vision. Two new techniques entering the market
are technology from Israeli firm, Saccade Vision, and French spin-off Tridimeo. Saccade Vision has developed a MEMS- based 3D triangulation profiler. Te MEMS- based laser illumination module can scan in multiple directions, and the device is able to create selective resolution and locally optimised scanning. Tridimeo’s device, meanwhile, is a
high-speed and multispectral 3D camera. Te core technology is called a spectrally- coded-light 3D scanner. It is based on a projector that can encode data directly on the spectrum of the projected light beam. Te beam makes it possible to probe both the shape and the optical spectrum of the object in the scene. Saccade Vision is working on pilot
Both Saccade Vision and Tridimeo are targeting the automotive sector with their 3D vision cameras
projects with customers at the moment, both in production and as integration projects. A power electronics manufacturer is working with the system – currently as a stand-alone system – to give critical measurements of injection-moulded parts. ‘Tis is a difficult part to measure,’ explains Alex Shulman, co-founder and chief executive of Saccade Vision. ‘It’s black, it has thin walls, so a regular profiler can have issues with under-sampling. In our case, we can optimise the scan for different regions,
20 IMAGING AND MACHINE VISION EUROPE AUGUST/SEPTEMBER 2021
so if we’re scanning a thin wall we can do it more accurately.’ Te next step is to integrate the system on
an injection moulding machine to make the measurements directly. ‘Instead of doing a manual inspection with callipers every two hours, which is how these parts are normally checked, the customer wants to do it automatically with high sampling rates,’ Shulman says. Te system can make a pre-scan of the entire part at low resolution to align it. It can
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