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EN
This paper describes a cheap, portable coordinate system for measuring circular geometries. The developed software can measure diameters, circle center coordinates, and distances between them. The circle detector uses the Adaptive Hough Transform implemented in the OpenCV library. For image rectification, the system uses reference circle positions on the plane parallel to the plane of the measured ones. Pixel size is determined by the distances between the reference circle positions on the same plane. The mean measurement value from a series of photos was found efficient estimation of accurate value, significantly improving overall system accuracy.
2
Content available remote Nowoczesne systemy pomiarów obiektów wielkogabarytowych
PL
Początek XXI w. przyniósł wiele zmian w sposobie patrzenia na otaczającą nas rzeczywistość. Wyzwania związane ze zmianą klimatu i postępującą globalizacją wywierają wpływ na życie każdego człowieka, dotykając nawet najbardziej przyziemnych spraw.
PL
Zlecanie prac badawczych akredytowanym laboratoriom stanowi podstawę w procesie podejmowania decyzji oraz przy zarządzaniu ryzykiem. Badania prowadzone przez akredytowane laboratoria zapewniają wiarygodne wyniki, otrzymane zgodnie z najlepszą praktyką, co wpływa na ograniczenie liczby wadliwych wyrobów, obniża koszty kontroli i produkcji, a także umożliwia wdrażanie innowacyjnych rozwiązań. Jakość wyrobów potwierdzona przez akredytowane laboratoria umożliwia przedsiębiorstwom dostęp do rynków zewnętrznych zgodnie z zasadą „badany lub certyfikowany raz – wszędzie akceptowany”.
EN
Outsourcing of research to accredited laboratories is the basis for decision- making and risk management. Research conducted by accredited laboratories ensures reliable results, obtained in accordance with the best practice, which reduces the number of defective products, reduces inspection and production costs, and enables the implementation of innovative solutions. The proven quality of products confirmed by accredited laboratories enables companies to access external markets in accordance with the principle of „tested or certified once – accepted everywhere”.
PL
Konferencje, kongresy i wszelkiego rodzaju sympozja organizowane w świecie rzeczywistym mają różne cele i efekty. Oprócz niezaprzeczalnych wartości naukowych wynikających z prezentowanych dokonań i świadomości, w którą stronę zmierza nauka, są też doskonałą okazją do spotkań w mniejszym gronie, wymiany doświadczeń w rozmowach kuluarowych i burzy mózgów powodującej koncepcje nowych badań i projektów. A zatem cofnijmy się do 2019 roku, kiedy nikomu jeszcze nie śniło się o pandemii, i przywołajmy wspaniałą atmosferę VIII Kongresu Metrologii, zorganizowanego w Augustowie przez Politechnikę Białostocką.
EN
Conferences, congresses and all kinds symposia organized in the real world have different goals and effects. In addition to the undeniable scientific values resulting from the presented achievements and the awareness in which direction science is heading, they are also an excellent opportunity to meet in a smaller group, exchange experiences in unofficial conversations and brainstorm the concepts of new research and projects. So let’s go back to 2019, when no one even thought that a pandemic was possible, and recall the wonderful atmosphere of the 8th Metrology Congress, organized in Augustów by the Białystok University of Technology.
EN
The area of application of contactless measuring systems has been rapidly growing over the past two decades. Development of contactless measuring methods can also be observed in Coordinate Metrology. Due to the growing number of contactless systems found in industry, there is also a growing interest in the issue of their accuracy among research centres. The interesting new solution which can be applied in contactless measurements is the usage of fiducial markers in dimensional metrology. In this paper, the authors present a simple and cheap optical system and try to assess its accuracy. A calibration process of a reference plate is described as well. Research was conducted for basic measuring tasks met in Coordinate Measuring Technique. Markers are attached to the z-axis ram of Coordinate Measuring Machine which is used as a reference system. The article presents the results obtained for basic measuring tasks, which can be a basis for further research aimed at improving the accuracy of measurements performed using fiducial markers.
EN
Laser Tracking systems are commonly used in all branches of industry, which requires accurate large-scale measurements for instance aviation, space and shipbuilding industries. Laser Trackers belong to the group of non-Cartesian Coordinate Measuring Systems. Determination of the measured point coordinates involves the measurements of distance using laser beam and two angles recorded by horizontal and vertical encoders. Additionally, the environmental conditions are monitored and used for compensation of measured distance. The coordinates of single measured point are estimated using the results obtained from a series of samples taken in a short time period. The average value obtained from a sample is given as a result; additionally, the dispersion parameters are calculated which can be used to evaluate the probing process. This paper presents the research procedure which allows assessing the influence of chosen dispersion parameter related to the sample averaging on accuracy of the measurements performed with laser tracking devices. The procedure involves standard elements measurements during which the points with similar level of RMS parameter are used for the calculation of the measurement result. Such approach allows simulating the increasing dispersion of points taken into account during sample probing. The results presented in the article can be helpful to the operators of laser tracking systems to assess the influence of the probing process on the measurement accuracy.
EN
The qualification of probe heads before the measurements performed with their usage is now a standard procedure. It is used for correction of probe head’s and measuring tip systematic errors. The calibration sphere, which is used for this process, should have adequately small form errors. However, it is not always possible to use a highly accurate spheres and it is a common practice to use a sphere that was provided by the manufacturer of the CMM for a long time. This is why, the authors have tried to answer the question about the impact of the calibration sphere inaccuracies on the results of probe head qualification process.
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