Virtual Coordinate Measuring Machine Built Using Lasertracer System and Spherical Standard

Sładek, Jerzy; Gąska, Adam; Olszewska, Magdalena; Kupiec, Robert; Krawczyk, Marcin

doi:10.2478/mms-2013-0007

Cited by 15 publications

(8 citation statements)

References 12 publications

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“…Alternatively, laser tracer systems can be used, which are well known for the calibration of coordinate measuring machines. 20 These coordinate measurement calibration procedures are not yet considered in the present simulations since the intention was to investigate the basic effects and show the demands on the positioning. To achieve an uncertainty of 0.01 MTF units, simulations have shown that an accuracy of the axial detector position in the range of the step size of the through-focus curve (250 nm) seems to be sufficient for sample lens 2.…”

Section: Discussionmentioning

confidence: 99%

Effects of misalignments on the modulation transfer function measurement of camera lenses analyzed in optomechanical simulations

et al. 2020

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of misalignments on the modulation transfer function measurement of camera lenses analyzed in optomechanical simulations," Opt. Eng. 59(3), 034101 (2020), Abstract. The Physikalisch-Technische Bundesanstalt has developed a reference setup for measuring the modulation transfer function (MTF) of camera lenses with the goal of reaching an expanded measurement uncertainty of 0.01 (coverage probability of 95%) for various measurement configurations. We present optomechanical simulations of the setup behavior, which are used to investigate the influence of the combined mechanical misalignments on the MTF depending on the lens under test. The investigations are carried out as part of Monte Carlo studies for different sample lenses and field heights considering the correlations between the effects of different positioning errors on the MTF measured. The results of the sensitivity analyses have allowed appropriate alignment strategies to be identified that significantly reduce the uncertainty contribution of the positioning errors. By implementing these strategies, the target measurement uncertainty can be achieved for most of the desired measurement configurations. In addition, the comparison of three different sample lenses shows that the MTF sensitivity to misalignments strongly depends on the characteristics of the lens to be measured. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.Recent developments in the use of camera lenses-e.g., in smartphones, professional cine cameras, or cameras used in advanced driver-assistance systems-necessitate high-precision quality control procedures to ensure high performance, cost-effective production, and compliance with safety aspects. 1-3 Since the theory of optical transfer function was described and the first measuring devices were developed in the 1950s, 4-7 specifying the imaging performance of optical components by a modulation transfer function (MTF) became a widely used technique in optical design and quality testing. Although the MTF is commonly used to specify the quality of imaging systems, at present, there is a lack of services offering traceable MTF calibrations.Motivated by the increasing demand in the industry, the Physikalisch-Technische Bundesanstalt (PTB), in cooperation with an industrial partner, is developing an MTF reference setup for camera lenses with the aim of reaching an expanded measurement uncertainty of 0.01 (coverage probability of 95%) for various measurement configurations. The aims of the project are that an accredited laboratory for MTF calibrations of camera lenses is established and the traceability will be supported by this reference setup. 8 According to our knowledge, there is currently no commercial MTF measurement setup available offering the desired accuracy for different field heights (on-axis and off-axis).

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Section: Discussionmentioning

confidence: 99%

Effects of misalignments on the modulation transfer function measurement of camera lenses analyzed in optomechanical simulations

et al. 2020

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“…However, it is certainly possible to create an application which would automatically detect the optimal placement of a measured workpiece using the discussed model and additional data concerning the shape of the object. It could also be possible to combine this application with the module responsible for the simulation of probe head errors (like the one presented in [36]), which would allow to limit All values are given in mm measurement uncertainty even further by suggesting the optimal number of probing points and their distribution. In this way, it should be possible to definitely design the most optimal measurement strategy.…”

Section: Resultsmentioning

confidence: 99%

“…Further examples proving its possible application for this task can be found in [34,36]. The model could also be of use for determining the optimal position of a measured workpiece in the measuring volume of the machine.…”

Section: Modeling Of Kinematic System Residual Errorsmentioning

confidence: 99%

Modeling of the residual kinematic errors of coordinate measuring machines using LaserTracer system

Gąska

Krawczyk

Kupiec

et al. 2014

Int J Adv Manuf Technol

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The following article examines the methodology of identifying and modeling kinematic errors of coordinate measuring machines with the use of a modern and precise interferometric system-the LaserTracer. Since the kinematic errors of coordinate measuring machines (CMMs) are by far the most prevalent factor in measurement uncertainty, a specially developed model could be used for efficient uncertainty evaluation as an additional module of the virtual measuring machine responsible for simulation of the CMM kinematic errors. The model could also be of use for determining optimal measurement strategy, and would potentially improve the uncertainty of measurements performed.

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“…Usually, to verify vision-based system accuracy, measurements are also performed on more precise metrological devices, such as coordinate measuring machines [21,22] or Laser Tracker systems and then compared. The CMMs are widely used for industrial dimensional validation, but their measurement speed is too slow for 100% in-line inspection.…”

Section: Introductionmentioning

confidence: 99%

A structure's deflection measurement and monitoring system supported by a vision system

Kohut¹,

Gąska²,

Holak³

et al. 2014

Tm - Technisches Messen

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In this paper a vision-based method for measuring vertical deflection of large engineering structures under load is presented in example of crane working arm deflection measurements. The deflection is computed by means of a digital image correlation technique embedded in the vision-based system. The results of measurements performed on the vision system were compared with data obtained using a Leica Laser Tracker system. The comparison revealed proper functioning of the developed vision system in industrial conditions. Zusammenfassung: Dieser Beitrag präsentiert ein bildgestütztes Verfahren zur Messung der vertikalen Auslenkung großer technischer Strukturen unter Belastung am Beispiel von Auslenkungsmessungen eines Kranarms. Die Auslenkungsbestimmung basiert auf digitaler Bildkorrelation. Die mit dem Bildverarbeitungssystem erzielten Messergebnisse wurden mit Daten eines Leica-LasertrackerSystems verglichen. Der Vergleich zeigt die geeignete Funktionsweise des entwickelten Systems unter industriellen Bedingungen.

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Virtual Coordinate Measuring Machine Built Using Lasertracer System and Spherical Standard

Cited by 15 publications

References 12 publications

Effects of misalignments on the modulation transfer function measurement of camera lenses analyzed in optomechanical simulations

Effects of misalignments on the modulation transfer function measurement of camera lenses analyzed in optomechanical simulations

Modeling of the residual kinematic errors of coordinate measuring machines using LaserTracer system

A structure's deflection measurement and monitoring system supported by a vision system

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