Tech Talk: The Advantages of <br>Laser Triangulation

Tech Talk: The Advantages of
Laser Triangulation

In our previous blog we talked about all technical properties of laser triangulation. We use laser triangulation as measurement technique with our val-IT Smart. Laser triangulation has a few major advantages over other optical 3D techniques:

  • You can easily inspect large surfaces with lasers, the laser doesn’t come with any limitations about size. When it comes to size, the only thing you need to take in consideration is the length of the linear axis on which the object or scanner is mounted on.
  • Highspeed cameras and industrial (high powered) lasers become ‘commodity’, which reflects in a lowering of the price.
  • In theory, you can obtain high accurate and precise point clouds, but in practice it heavily depends on material properties. Laser triangulations knows its way around these challenges.
  • Laser triangulation is not really computationally complex, meaning that you can get large point clouds in a short amount of time. A scan including feedback about the results is done in less than half a minute.
  • Lasers have a long a very long lifetime and can take up to 8000 hours before replacement is needed.

In conclusion we can say that the use of laser triangulation comes with a whole lot of advantages. But of course there are, just like with other techniques, a few limitations that need to be noted. Fortunately, at senseIT we’ve found our ways to minimize those limitations. Nevertheless, we should pay some attention to the disadvantages of using laser triangulation:

  • Lasers are dangerous for the human eye, so proper precaution (like the use of protection glasses) should be taken to ensure safe operation. All of our 3D inspection cells are fully closed off and the lasers can only be activated if there is no one in the cell.
  • Laser light has a very high intensity and is not suitable for all materials. Most of the time your application is very optimized, but for one specific material only. This is the reason you can’t just switch between products of different materials whenever you want.
  • It is complex to control motion. 3D vision measurements are sensitive for vibration, vibrations will impact the accuracy of the results. Motion is a problematic variable that we see a lot in big manufactories, think for example about big machines with high power that causes the whole floor to shake. Also the wear and tear of the linear axis where the laser is mounted on, can have an impact on the accuracy because it causes little bumps during the measurement.
    We solve this problem by building the housing of the val-IT Smart with heavy steel, which we minimally connect to the floor of the manufactory. This way vibrations cause hardly any effect during the measurements. Also, the val-IT Smart consists of one steady frame where all essential measuring parts are mounted to. The small amount of vibration that does get through, effects all parts the same way.