The difference between 3D scanner light sources

[olivel]

Hello everyone, this is my first time posting on the forum, and of course I hope to get your professional opinions and help here~
I am a student and currently paying attention to the research direction of 3D vision. I see that the market application demand for 3D technology is also gradually expanding. More and more 3D manufacturers have launched a variety of 3D scanning equipment suitable for different scenarios. This seems to cause some trouble for everyone's purchase.
Recently, I also searched and learned about this aspect. At the same time, I bought a 3D scanner（

https://www.revopoint3d.com）

myself to experience it. I learned that the working principle of 3D scanner mainly includes structured light scanning and laser scanning. The former is suitable for scanning close-range, small and medium-sized objects, and can calculate the depth information of the object surface by observing the deformation of structured light. The latter is suitable for scanning long-distance and large-sized objects, and can calculate the depth information of the object surface by measuring the flight time of light.

Secondly, I have observed that the light sources of 3D scanners on the market include infrared light, blue light, white light, etc. I want to understand the differences between different light sources and their impact on actual scanning, and how to choose the appropriate one based on specific application requirements and the characteristics of the scanned object. light source. I hope you can help me, thank you~

 

[IRstuff]

As with all designs, there are tradeoffs between cost and performance. Blue light has the lowest wavelength, so it hypothetically results in the best Rayleigh criteria for any lens, proportional to lambda*f_number, but blue light is expensive, while white light is much cheaper, but has lots of fatter wavelengths.

There may be other tradeoffs not evident, but ambient light interference would certainly be a reason for using infrared, since that can be filtered out and the ambient doesn't necessarily have much infrared, relative to visible wavelengths.

TTFN (ta ta for now)
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[drawoh]

olivel,

I have spent a good part of my career working with LiDAR bathymeters that measure water depth. The laser is frequency doubled, putting out 532nm (green) and 1064nm (near infra-red). The infra-red laser reflects off the water surface. Much of the green laser penetrates the water and reflects off the bottom.

--
JHG