3D vision for the measurement of eccentricity of pipes

The aim of this project has been to design, to implement and to characterize a system for the 3D measurement of eccentricity of pipes.

This system was originally based on four laser slits, suitable oriented with respect to the pipe to acquire the external and the internal semi-profiles. In order to develop a compact version of the instrument, we studied a new optical layout, which halves the number of the cameras.

Related Publications

Sansoni, G.; Bellandi, P.; Docchio, F. “Design and development of a 3D system for the measurement of tube eccentricity“, Measurement Science and Technology, Vol. 22, no. 7. 2011

Sansoni, G.; Bellandi, P.; Docchio, F. “3D system for the measurement of tube eccentricity: an improved, rugged, easy to calibrate layout“, Measurement Science and Technology, Vol. 24, no. 3. 2013


Development of Laser Slits: Student Projects

The development of systems based on the projecttion of laser stripes is very interesting under the education point of view. Students must learn about active triangulation principlesimaging techniquesprogramming techniques, and metrology.

In addition, computer vision is required for the calibration of the camera projector pair. This article reports examples of this type of projects.

The first one is the development of a laser slit system for the measurement of the central profile of small buttons. The system has been completely developed in LabView.

The students are Emanuele Ferrari and Paolo Bellandi. In this presentation one can learn how they worked for the development of the demonstrator.

The demonstrator developed by the students for the project.

The second project deals with the development of a system based on the projection of two laser stripes and the use of a single camera. The aim is to add redundancy to decrease the influence of shadow, which inherently decrease the performances of the measurement. 

Two Ph. D. students are being working at this project: Paolo Bellandi and Gianluca Cavagnini. The first results are available in the presentation.

The demonstrator developed so far by the Ph. D. students.