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Adaptive Hough Transform Circle Detection Application in Developed 2D Coordinate Measuring System

Zięba Przemysław, Gąska Adam, Harmatys Wiktor, Krawczyk Marcin

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 6

185--191

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

Simple Optical Coordinate Measuring System, Based on Fiducial Markers Detection, and its Accuracy Assessment

Gąska Piotr, Harmatys Wiktor, Gruza Maciej, Gąska Adam, Sładek Jerzy

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 4

213--219

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.

3

Assessment of Influence of Sample Averaging on Accuracy of Point Coordinates Measurement Performed Using Laser Tracking Systems

Gruza Maciej, Gąska Piotr, Gąska Adam, Harmatys Wiktor, Jedynak Michał, Kobiela Konrad

Advances in Science and Technology. Research Journal

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2019

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Vol. 13, no 4

94--99

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.

4

Determination of the influence of calibration sphere parameters on the results of articulating probe head qualification

Gruza Maciej, Gąska Adam, Gąska Piotr, Harmatys Wiktor, Sładek Jerzy

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 2

252--259

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.