Analiza merilne negotovosti tridimenzionalnega skenerja Photoneo PhoXi 3D

SUSMAN PODJED, JURE (author), Agrež, Dušan (mentor)

Delo obravnava analizo merilne negotovosti tridimenzionalnega skenerja Photoneo PhoXi 3D. Ker je skener med drugim lahko uporabljen kot merilni sistem, je pomembno zavedanje o njegovi merilni negotovosti. V delu je tako za namen izpeljave analize predstavljen elektromehanski sistem za izvedbo potrebnih meritev. Opisani so posamezni gradniki sistema, ki poleg elektromehanskega dela zajema tudi programski del. Za izvedbo analize je predlagan postopek z linearnim pomikanjem skenerja in uporabo linearnega dajalnika pomika kot referenčnega merilnega instrumenta. Analiza merilne negotovosti temelji na uporabi kalibracijskega vzorca, šahovnice, za določitev karakterističnih točk v oblaku točk, na mestu katerih so izvedene meritve. Na podlagi rezultatov analize smo ugotovili, da merilna negotovost ob pomiku skenerja proti koncu merilnega območja narašča. Vse bolj je očiten raztros meritev od srednje vrednosti. Kljub temu vrednost merilne negotovosti ostaja znotraj meja v specifikacijah podane globinske ločljivosti skenerja.

• Language: Slovenian
• Keywords: merilna negotovost, tridimenzionalni skener, strukturirana svetloba, oblak točk, strojni vid, kalibracijski vzorec, linearni dajalnik pomika
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2019
• PID: 20.500.12556/RUL-108180
• Publication date in RUL: 20.06.2019

Secondary language

• Language: English
• Title: Analysis of the measurement uncertainty of the three-dimensional scanner Photoneo PhoXi 3D

Abstract

The thesis presents an analysis of measurement uncertainty of a three-dimensional scanner Photoneo PhoXi 3D. Awareness of the measurement uncertainty is important as the scanner can also be used as a measuring system. We present an electromechanical system which is utilized to conduct necessary measurements. We also describe individual elements of the system, including software parts. For the analysis, we propose a process with linear movements of the scanner and usage of a linear displacement encoder as a reference measuring instrument. The analysis of the measurement uncertainty is based on the usage of a calibration pattern, chessboard, to determine locations of characteristic points in a point cloud. Based on the results of our analysis we can conclude that the measurement uncertainty rises when the scanner approaches the end of its measurement range. We also observe the scattering of measurements around their mean value. Despite that, the measurement uncertainty remains within the specified limits of the scanner's depth resolution.

• Keywords: measurement uncertainty, three-dimensional scanner, structured light, point cloud, machine vision, calibration pattern, linear encoder