Tino Hausotte - Academia.edu (original) (raw)
Papers by Tino Hausotte
Measurement Science and Technology, 2011
... in 1986 by Binnig, Quate and Gerber [2], the AFM has emerged along with SEM as an ... Afterca... more ... in 1986 by Binnig, Quate and Gerber [2], the AFM has emerged along with SEM as an ... Aftercalibration, the orthogonality error will be compensated by the mAFM controller. ... Every second, the real-time computer interrogates the weather station through the network using a RS232 ...
tm - Technisches Messen, 2019
This article presents a new tilting atomic force microscope (AFM) with an adjustable probe direct... more This article presents a new tilting atomic force microscope (AFM) with an adjustable probe direction and piezoresistive cantilever operated in tapping-mode. The AFM is based on two rotational axes, which enable the adjustment of the probe direction to cover a complete hemisphere. The whole setup is integrated into a nano measuring machine (NMM-1) and the metrological traceability of the piezoresistive cantilever is warranted by in situ calibration on the NMM-1. To demonstrate the capabilities of the tilting AFM, measurements were conducted on a step height standard.
Journal of Sensors and Sensor Systems, Aug 1, 2022
Due to the complex physical and technical relationships in dimensional X-ray computed tomography ... more Due to the complex physical and technical relationships in dimensional X-ray computed tomography measurement technology, the precise influences on the measurement result are still not fully understood. A deeper understanding of these influences is essential in order to improve the measurement accuracy and economy of computed tomographic measurement systems. In addition, this enables better numerical determination of measurement uncertainties, which is also a topic of current research. Two factors that have a significant influence on the lead times are the scan mode and the number of projections per measurement. In this article, these factors are investigated experimentally using a calibrated workpiece, and the influence of the workpiece position on the measurement result is also examined. It can be shown that the workpiece position has a considerable influence on the quality of the measurement, especially in the case of a continuous scan. The results show a vast potential for application-dependent reduction of lead times.
tm - Technisches Messen
Zusammenfassung Unter dem Begriff der Auflösung wird für gewöhnlich das kleinste messbare Merkmal... more Zusammenfassung Unter dem Begriff der Auflösung wird für gewöhnlich das kleinste messbare Merkmal eines Messsystems verstanden. In der dimensionellen Computertomografie hingegen haben sich in den vergangenen Jahren mehrere Auflösungskonzepte etabliert, die aufgrund der fehlenden Normung zueinander im Kontrast stehen. In diesem Beitrag werden die drei häufigsten Konzepte, die Voxelgröße, die Ortsauflösung und die metrologische Strukturauflösung in Kürze vorgestellt. Anschließend wird eine Abgrenzung zwischen den Konzepten getroffen und ein Integration der bestehenden Konzepte in ein gemeinsames Amplituden-Wellenlängen Diagramm diskutiert.
tm - Technisches Messen
Zusammenfassung Die Erkennbarkeit von Rissen und geometrischen Qualitätskennwerten von Fügeverbin... more Zusammenfassung Die Erkennbarkeit von Rissen und geometrischen Qualitätskennwerten von Fügeverbindungen mittels Computertomografie ist von der Interfacestrukturauflösung abhängig, welche mittels geeigneter Prüfkörper untersucht wird. Die Reduktion von Abbildungsartefakten im Bereich von Bauteilzwischenräumen und -oberflächen verbessert deren dimensionelle Erfassbarkeit.
tm - Technisches Messen, 2018
Zusammenfassung In diesem Artikel wird ein neues Messverfahren zur Oberflächenmessung bei gleichz... more Zusammenfassung In diesem Artikel wird ein neues Messverfahren zur Oberflächenmessung bei gleichzeitiger axialer Regelung des Arbeitsabstandes eines hochfrequent fokusabstandsmodulierten, fasergekoppelten, konfokalen Punktsensors in einem Nanokoordinatenmessgerät (NMM- 1) [4] vorgestellt. Während bei diesem Verfahren alle bekannten Vorteile der Konfokaltechnik beibehalten werden, stellt die innovative Kombination einer fasergekoppelten Beleuchtung und Detektion mit einer akustisch getriebenen, modulierbaren Flüssigkeitsgradientenlinse (engl. tunable, acoustically driven gradient-index fluid lens, Abk. TAG-Linse) [10] zur hochfrequenten Abstandmodulation des Fokus zusammen mit einer neuartigen Signalverarbeitung auf Basis einer Lock-in-Verstärkung eine wesentliche Verbesserung dar. Durch die Anordnung und Auswertung ergibt sich im Gegensatz zu konventionellen konfokalen Punktsensoren eine nahezu lineare Kennlinie, wobei die Richtung der Abweichung der Messobjektoberfläche relativ zur...
Journal of Sensors and Sensor Systems
Acceptance and reverification testing for industrial X-ray computed tomography (CT) is described ... more Acceptance and reverification testing for industrial X-ray computed tomography (CT) is described in different standards (
Metrology, 2022
The article presents the determination of the topographic spatial resolution of an optical point ... more The article presents the determination of the topographic spatial resolution of an optical point sensor. It is quantified by the lateral period limit DLIM measured on a type ASG material measure, also called (topographic) Siemens star, with a confocal sensor following both a radial measurement and evaluation, as proposed by ISO 25178-70, and the measurement and subsequent evaluation of two line scans, proposed by the NPL Good Practice Guide. As will be shown, for the latter, an only slightly misidentified target centre of the Siemens star leads to quite significant errors of the determined DLIM. Remarkably, a misidentified target centre does not necessarily result in an overestimation of DLIM, but lower values might also be obtained. Therefore, a modified Good Practice Guide is proposed to determine DLIM more accurately, as it includes a thorough determination of the centre of the Siemens star as well. While the measurement and evaluation effort is increased slightly compared to the...
For providing holistic and complete dataset of sheet bulk metal-formed parts, an optical detectio... more For providing holistic and complete dataset of sheet bulk metal-formed parts, an optical detection with a fringe projection system is useful. By combining several sensors with varying measuring ranges, the workpiece is captured with adapted spatial resolution depending on the forming zone and geometric requirements. The sensors are registered by a two-dimensional point calibration and registration process. The registration process has already been shown in.1 In this article, the calibration procedure is transferred to the measurement setup with three fringe projection sensors with different measurement resolution. A calibration plate with dot patterns is applied to the positioning unit, which is a high precision hexapod in this set-up. This extended calibration plate allows a continuous control of the registration quality as the sensors are able to capture the calibration plate at any time. For determining the positioning accuracy of the hexapod, a procedure following the DIN EN ISO...
Part of the optimization steps for additive manufacturing is related to the correct understanding... more Part of the optimization steps for additive manufacturing is related to the correct understanding of the mechanical behavior of the powder used in the process. Obtain this understanding based purely on experiments might be a difficult and sometimes prohibitive task. A particle-based numerical tool can provide critical information for correct understanding of powder deposition process. Numerical simulations through the Discrete Element Method (DEM) provide a useful mean to investigate the additive manufacturing process, given the possibility to study particle-scale information that are difficult to access experimentally. The characteristics of the recoated powder bed are investigated in the packed bed region and onto the manufactured part using PA12 commercial powder. Particle size distribution, contact and non-contact cohesive forces are incorporated in the numerical model. Furthermore, the non-spherical shape of real particles is taken explicitly into account in numerical simulatio...
Measurement Science and Technology, 2021
Industrial x-ray computed tomography (CT) represents an established measurement technique in the ... more Industrial x-ray computed tomography (CT) represents an established measurement technique in the field of nondestructive testing and dimensional metrology. However, the measurement accuracy is sometimes limited by measurement artifacts that cannot be avoided using a standard circular scan trajectory. This problem can be addressed with the aid of flexible 3D trajectories, but up to date, the application of these is mainly restricted to special CT devices using robot arms. In this paper, we present results using a hexapod as an additional positioning system in a commercial industrial CT scanner. In addition to the 360∘ rotation, task-specific tilting of the part during the scan is possible in this way. We used and adapted geometry calibration procedures based on a multi-sphere reference object to enable reconstruction with high accuracy. Using a demonstrator test fixture with high absorbing elements, we show that severe metal and truncation artifacts can be avoided for a region-of-int...
tm - Technisches Messen, 2021
Zusammenfassung Bei der taktilen Erfassung einer Oberfläche lässt sich eine Beeinflussung des Mes... more Zusammenfassung Bei der taktilen Erfassung einer Oberfläche lässt sich eine Beeinflussung des Messergebnisses durch die morphologische Filterung infolge der endlichen Größe des Antastelementes und die Wirkung der mechanischen Antastkraft nicht vermeiden. Durch die Simulation dieser Filterung und der zusätzlichen Berücksichtigung der elastischen Abplattung können Modelle für die Simulation von taktilen Koordinatenmessungen bereitgestellt werden. Zur Simulation der Abplattung werden die Oberflächenprofile in die einzelnen Wellen- bzw. Ortsfrequenzbestandteile zerlegt. Jede Wellenamplitude wird entsprechend ihres Anteils an der Verformung reduziert. Das daraus resultierende Profil wird hinsichtlich verschiedener Oberflächenparameter analysiert. Bei der Auswertung der Welligkeit und der Geradheitsabweichungen lassen sich unterschiedliche Effekte für verschiedenen Simulationsparameter und Auswertebedingungen erkennen. Der Einfluss der elastischen Abplattung auf das Ergebnis steht in Abhä...
Surface Topography: Metrology and Properties, 2016
High-precision metrology has emerged as an enabling technology for modern key technologies. There... more High-precision metrology has emerged as an enabling technology for modern key technologies. Therefore, at the Technische Universitat Ilmenau, a new nanopositioning and nanomeasuring machine NPMM-200 with a measuring range of 200 mm × 200 mm × 25 mm, and a resolution of 0.02 nm was developed. The machine represents the great improvement of the extended three-dimensional Abbe comparator principle to achieve nanometre accuracy. All six degrees of freedom of the mirror plate with the measuring object are measured by fibre-coupled laser interferometers, the signals of which are then used together with the probe system signals for a high-precision position and orientation control and surface and coordinate measurements. This paper presents the metrological concept, the realized design as well as the metrological parameters.
Measurement Science Review, 2013
The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic ... more The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic systems and also the fundament of measurement uncertainty evaluation in the GUM. Many powerful algorithms have been derived and applied to numerous problems. The most widely used algorithms are the broad family of Kalman filters (KFs), the grid-based filters and the more recent particle filters (PFs). Over the last 15 years, especially PFs are increasingly the subject of researches and engineering applications such as dynamic coordinate measurements, estimating signals from noisy measurements and measurement uncertainty evaluation. This is rooted in their ability to handle arbitrary nonlinear and/or non-Gaussian systems as well as in their easy coding. They are sampling-based sequential Monte-Carlo methods, which generate a set of samples to compute an approximation of the Bayesian posterior probability density function. Thus, the PF faces the problem of high computational burden, since ...
International Journal of Nanomanufacturing, 2011
The paper describes traceable nanometrology based on a nanomeasuring machine. The high performanc... more The paper describes traceable nanometrology based on a nanomeasuring machine. The high performance of the machine is explained with a metrological analysis. This analysis shows some of today's limits of the nanopositioning and nanomeasuring engineering. The limits are based, for instance, on the metre definition as redefined in 1983 as well as on the comparison between an iodine-stabilised helium-neon laser and a stabilised helium-neon laser to be stabilised and on the influence of the refractive index of the air. In addition to the stability of the machine's metrological frame, the realisation of the Abbe comparator principle plays a fundamental role in machine design and represents a significant challenge when being applied in all axes simultaneously. There are various machines for positioning and measuring samples which are based on different working modes: scanning probe mode, mixed scanning mode and sample scanning mode. These modes are analysed with respect to first-and second-order Abbe errors.
Key Engineering Materials, 2015
The technology of sheet-bulk metal forming enables the production of complex workpieces with fili... more The technology of sheet-bulk metal forming enables the production of complex workpieces with filigree surface structures in only a few forming steps. In order to provide a rapid and production-related workpiece inspection of not only large workpiece features, but also small features in an appropriate quality, a multi-sensor optical measurement system with different resolutions is required. Workpiece features of medium size can be measured by two types of fringe projection sensors. With a structured approach according to Six Sigma, which is based on the five phases design, measure, analyze, improve and control complex tasks are divided into smaller individual problems. In each phase the Six Sigma method recommends tools for solving the individual problems effectively. With the support of the Six Sigma guideline an exemplary sheet-bulk metal forming workpiece feature is used in order to qualify the two measuring systems for a production-related measurement. After defining the explicit...
2013 International Conference on Computing, Management and Telecommunications (ComManTel), 2013
The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic ... more The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic systems. The algorithmic implementations of the recursive Bayesian estimation for arbitrary systems are the particle filters (PFs). They are sampling-based sequential Monte-Carlo methods, which generate, a set of samples to compute an approximation of the Bayesian posterior probability density function. Thus, the PF faces the problem of high computational burden, since it converges to the true posterior when number of particles Np → ∞. In order to solve these computational problems a highly parallelized C++ library, called Parallel Bayesian Toolbox (PBT), for implementing Bayes filters (BFs) was developed and released as open-source software, for the first time [1]. It features a high level language interface for numerical calculations and very efficient usage of available central processing units (CPUs) and graphics processing units (GPUs). This significantly increases the computational throughput without the need of special hardware such as application-specific integrated circuits (ASICs) or field-programmable gate arrays (FPGAs).
Key Engineering Materials, 2012
Sheet bulk metal forming is a new forming technology, currently developed by several companies an... more Sheet bulk metal forming is a new forming technology, currently developed by several companies and research institutes. It creates high demands on the inspection of parts and tools, especially in the field of in-situ abrasion detection of the forming tool and its impacts on the work piece. This manuscript introduces two optical testing methods for fulfilling these inspection tasks: On the one hand the endoscopic fringe projection as a flexible small scale optical measurement principal with high depth of focus and accuracy for the acquisition of filigree form elements for a continuous abrasion determination and one the other hand the multi-scaled fringe projection for a holistic one shot measurement of the work piece for an adapted, multiscale deviation analysis. The development and advantages of both systems for the sheet bulk metal forming process are shown as well as potentials of the combination of the both systems close to the proposed application next to the production line.
Measurement Science and Technology, 2011
... in 1986 by Binnig, Quate and Gerber [2], the AFM has emerged along with SEM as an ... Afterca... more ... in 1986 by Binnig, Quate and Gerber [2], the AFM has emerged along with SEM as an ... Aftercalibration, the orthogonality error will be compensated by the mAFM controller. ... Every second, the real-time computer interrogates the weather station through the network using a RS232 ...
tm - Technisches Messen, 2019
This article presents a new tilting atomic force microscope (AFM) with an adjustable probe direct... more This article presents a new tilting atomic force microscope (AFM) with an adjustable probe direction and piezoresistive cantilever operated in tapping-mode. The AFM is based on two rotational axes, which enable the adjustment of the probe direction to cover a complete hemisphere. The whole setup is integrated into a nano measuring machine (NMM-1) and the metrological traceability of the piezoresistive cantilever is warranted by in situ calibration on the NMM-1. To demonstrate the capabilities of the tilting AFM, measurements were conducted on a step height standard.
Journal of Sensors and Sensor Systems, Aug 1, 2022
Due to the complex physical and technical relationships in dimensional X-ray computed tomography ... more Due to the complex physical and technical relationships in dimensional X-ray computed tomography measurement technology, the precise influences on the measurement result are still not fully understood. A deeper understanding of these influences is essential in order to improve the measurement accuracy and economy of computed tomographic measurement systems. In addition, this enables better numerical determination of measurement uncertainties, which is also a topic of current research. Two factors that have a significant influence on the lead times are the scan mode and the number of projections per measurement. In this article, these factors are investigated experimentally using a calibrated workpiece, and the influence of the workpiece position on the measurement result is also examined. It can be shown that the workpiece position has a considerable influence on the quality of the measurement, especially in the case of a continuous scan. The results show a vast potential for application-dependent reduction of lead times.
tm - Technisches Messen
Zusammenfassung Unter dem Begriff der Auflösung wird für gewöhnlich das kleinste messbare Merkmal... more Zusammenfassung Unter dem Begriff der Auflösung wird für gewöhnlich das kleinste messbare Merkmal eines Messsystems verstanden. In der dimensionellen Computertomografie hingegen haben sich in den vergangenen Jahren mehrere Auflösungskonzepte etabliert, die aufgrund der fehlenden Normung zueinander im Kontrast stehen. In diesem Beitrag werden die drei häufigsten Konzepte, die Voxelgröße, die Ortsauflösung und die metrologische Strukturauflösung in Kürze vorgestellt. Anschließend wird eine Abgrenzung zwischen den Konzepten getroffen und ein Integration der bestehenden Konzepte in ein gemeinsames Amplituden-Wellenlängen Diagramm diskutiert.
tm - Technisches Messen
Zusammenfassung Die Erkennbarkeit von Rissen und geometrischen Qualitätskennwerten von Fügeverbin... more Zusammenfassung Die Erkennbarkeit von Rissen und geometrischen Qualitätskennwerten von Fügeverbindungen mittels Computertomografie ist von der Interfacestrukturauflösung abhängig, welche mittels geeigneter Prüfkörper untersucht wird. Die Reduktion von Abbildungsartefakten im Bereich von Bauteilzwischenräumen und -oberflächen verbessert deren dimensionelle Erfassbarkeit.
tm - Technisches Messen, 2018
Zusammenfassung In diesem Artikel wird ein neues Messverfahren zur Oberflächenmessung bei gleichz... more Zusammenfassung In diesem Artikel wird ein neues Messverfahren zur Oberflächenmessung bei gleichzeitiger axialer Regelung des Arbeitsabstandes eines hochfrequent fokusabstandsmodulierten, fasergekoppelten, konfokalen Punktsensors in einem Nanokoordinatenmessgerät (NMM- 1) [4] vorgestellt. Während bei diesem Verfahren alle bekannten Vorteile der Konfokaltechnik beibehalten werden, stellt die innovative Kombination einer fasergekoppelten Beleuchtung und Detektion mit einer akustisch getriebenen, modulierbaren Flüssigkeitsgradientenlinse (engl. tunable, acoustically driven gradient-index fluid lens, Abk. TAG-Linse) [10] zur hochfrequenten Abstandmodulation des Fokus zusammen mit einer neuartigen Signalverarbeitung auf Basis einer Lock-in-Verstärkung eine wesentliche Verbesserung dar. Durch die Anordnung und Auswertung ergibt sich im Gegensatz zu konventionellen konfokalen Punktsensoren eine nahezu lineare Kennlinie, wobei die Richtung der Abweichung der Messobjektoberfläche relativ zur...
Journal of Sensors and Sensor Systems
Acceptance and reverification testing for industrial X-ray computed tomography (CT) is described ... more Acceptance and reverification testing for industrial X-ray computed tomography (CT) is described in different standards (
Metrology, 2022
The article presents the determination of the topographic spatial resolution of an optical point ... more The article presents the determination of the topographic spatial resolution of an optical point sensor. It is quantified by the lateral period limit DLIM measured on a type ASG material measure, also called (topographic) Siemens star, with a confocal sensor following both a radial measurement and evaluation, as proposed by ISO 25178-70, and the measurement and subsequent evaluation of two line scans, proposed by the NPL Good Practice Guide. As will be shown, for the latter, an only slightly misidentified target centre of the Siemens star leads to quite significant errors of the determined DLIM. Remarkably, a misidentified target centre does not necessarily result in an overestimation of DLIM, but lower values might also be obtained. Therefore, a modified Good Practice Guide is proposed to determine DLIM more accurately, as it includes a thorough determination of the centre of the Siemens star as well. While the measurement and evaluation effort is increased slightly compared to the...
For providing holistic and complete dataset of sheet bulk metal-formed parts, an optical detectio... more For providing holistic and complete dataset of sheet bulk metal-formed parts, an optical detection with a fringe projection system is useful. By combining several sensors with varying measuring ranges, the workpiece is captured with adapted spatial resolution depending on the forming zone and geometric requirements. The sensors are registered by a two-dimensional point calibration and registration process. The registration process has already been shown in.1 In this article, the calibration procedure is transferred to the measurement setup with three fringe projection sensors with different measurement resolution. A calibration plate with dot patterns is applied to the positioning unit, which is a high precision hexapod in this set-up. This extended calibration plate allows a continuous control of the registration quality as the sensors are able to capture the calibration plate at any time. For determining the positioning accuracy of the hexapod, a procedure following the DIN EN ISO...
Part of the optimization steps for additive manufacturing is related to the correct understanding... more Part of the optimization steps for additive manufacturing is related to the correct understanding of the mechanical behavior of the powder used in the process. Obtain this understanding based purely on experiments might be a difficult and sometimes prohibitive task. A particle-based numerical tool can provide critical information for correct understanding of powder deposition process. Numerical simulations through the Discrete Element Method (DEM) provide a useful mean to investigate the additive manufacturing process, given the possibility to study particle-scale information that are difficult to access experimentally. The characteristics of the recoated powder bed are investigated in the packed bed region and onto the manufactured part using PA12 commercial powder. Particle size distribution, contact and non-contact cohesive forces are incorporated in the numerical model. Furthermore, the non-spherical shape of real particles is taken explicitly into account in numerical simulatio...
Measurement Science and Technology, 2021
Industrial x-ray computed tomography (CT) represents an established measurement technique in the ... more Industrial x-ray computed tomography (CT) represents an established measurement technique in the field of nondestructive testing and dimensional metrology. However, the measurement accuracy is sometimes limited by measurement artifacts that cannot be avoided using a standard circular scan trajectory. This problem can be addressed with the aid of flexible 3D trajectories, but up to date, the application of these is mainly restricted to special CT devices using robot arms. In this paper, we present results using a hexapod as an additional positioning system in a commercial industrial CT scanner. In addition to the 360∘ rotation, task-specific tilting of the part during the scan is possible in this way. We used and adapted geometry calibration procedures based on a multi-sphere reference object to enable reconstruction with high accuracy. Using a demonstrator test fixture with high absorbing elements, we show that severe metal and truncation artifacts can be avoided for a region-of-int...
tm - Technisches Messen, 2021
Zusammenfassung Bei der taktilen Erfassung einer Oberfläche lässt sich eine Beeinflussung des Mes... more Zusammenfassung Bei der taktilen Erfassung einer Oberfläche lässt sich eine Beeinflussung des Messergebnisses durch die morphologische Filterung infolge der endlichen Größe des Antastelementes und die Wirkung der mechanischen Antastkraft nicht vermeiden. Durch die Simulation dieser Filterung und der zusätzlichen Berücksichtigung der elastischen Abplattung können Modelle für die Simulation von taktilen Koordinatenmessungen bereitgestellt werden. Zur Simulation der Abplattung werden die Oberflächenprofile in die einzelnen Wellen- bzw. Ortsfrequenzbestandteile zerlegt. Jede Wellenamplitude wird entsprechend ihres Anteils an der Verformung reduziert. Das daraus resultierende Profil wird hinsichtlich verschiedener Oberflächenparameter analysiert. Bei der Auswertung der Welligkeit und der Geradheitsabweichungen lassen sich unterschiedliche Effekte für verschiedenen Simulationsparameter und Auswertebedingungen erkennen. Der Einfluss der elastischen Abplattung auf das Ergebnis steht in Abhä...
Surface Topography: Metrology and Properties, 2016
High-precision metrology has emerged as an enabling technology for modern key technologies. There... more High-precision metrology has emerged as an enabling technology for modern key technologies. Therefore, at the Technische Universitat Ilmenau, a new nanopositioning and nanomeasuring machine NPMM-200 with a measuring range of 200 mm × 200 mm × 25 mm, and a resolution of 0.02 nm was developed. The machine represents the great improvement of the extended three-dimensional Abbe comparator principle to achieve nanometre accuracy. All six degrees of freedom of the mirror plate with the measuring object are measured by fibre-coupled laser interferometers, the signals of which are then used together with the probe system signals for a high-precision position and orientation control and surface and coordinate measurements. This paper presents the metrological concept, the realized design as well as the metrological parameters.
Measurement Science Review, 2013
The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic ... more The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic systems and also the fundament of measurement uncertainty evaluation in the GUM. Many powerful algorithms have been derived and applied to numerous problems. The most widely used algorithms are the broad family of Kalman filters (KFs), the grid-based filters and the more recent particle filters (PFs). Over the last 15 years, especially PFs are increasingly the subject of researches and engineering applications such as dynamic coordinate measurements, estimating signals from noisy measurements and measurement uncertainty evaluation. This is rooted in their ability to handle arbitrary nonlinear and/or non-Gaussian systems as well as in their easy coding. They are sampling-based sequential Monte-Carlo methods, which generate a set of samples to compute an approximation of the Bayesian posterior probability density function. Thus, the PF faces the problem of high computational burden, since ...
International Journal of Nanomanufacturing, 2011
The paper describes traceable nanometrology based on a nanomeasuring machine. The high performanc... more The paper describes traceable nanometrology based on a nanomeasuring machine. The high performance of the machine is explained with a metrological analysis. This analysis shows some of today's limits of the nanopositioning and nanomeasuring engineering. The limits are based, for instance, on the metre definition as redefined in 1983 as well as on the comparison between an iodine-stabilised helium-neon laser and a stabilised helium-neon laser to be stabilised and on the influence of the refractive index of the air. In addition to the stability of the machine's metrological frame, the realisation of the Abbe comparator principle plays a fundamental role in machine design and represents a significant challenge when being applied in all axes simultaneously. There are various machines for positioning and measuring samples which are based on different working modes: scanning probe mode, mixed scanning mode and sample scanning mode. These modes are analysed with respect to first-and second-order Abbe errors.
Key Engineering Materials, 2015
The technology of sheet-bulk metal forming enables the production of complex workpieces with fili... more The technology of sheet-bulk metal forming enables the production of complex workpieces with filigree surface structures in only a few forming steps. In order to provide a rapid and production-related workpiece inspection of not only large workpiece features, but also small features in an appropriate quality, a multi-sensor optical measurement system with different resolutions is required. Workpiece features of medium size can be measured by two types of fringe projection sensors. With a structured approach according to Six Sigma, which is based on the five phases design, measure, analyze, improve and control complex tasks are divided into smaller individual problems. In each phase the Six Sigma method recommends tools for solving the individual problems effectively. With the support of the Six Sigma guideline an exemplary sheet-bulk metal forming workpiece feature is used in order to qualify the two measuring systems for a production-related measurement. After defining the explicit...
2013 International Conference on Computing, Management and Telecommunications (ComManTel), 2013
The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic ... more The Bayesian theorem is the most used instrument for stochastic inferencing in nonlinear dynamic systems. The algorithmic implementations of the recursive Bayesian estimation for arbitrary systems are the particle filters (PFs). They are sampling-based sequential Monte-Carlo methods, which generate, a set of samples to compute an approximation of the Bayesian posterior probability density function. Thus, the PF faces the problem of high computational burden, since it converges to the true posterior when number of particles Np → ∞. In order to solve these computational problems a highly parallelized C++ library, called Parallel Bayesian Toolbox (PBT), for implementing Bayes filters (BFs) was developed and released as open-source software, for the first time [1]. It features a high level language interface for numerical calculations and very efficient usage of available central processing units (CPUs) and graphics processing units (GPUs). This significantly increases the computational throughput without the need of special hardware such as application-specific integrated circuits (ASICs) or field-programmable gate arrays (FPGAs).
Key Engineering Materials, 2012
Sheet bulk metal forming is a new forming technology, currently developed by several companies an... more Sheet bulk metal forming is a new forming technology, currently developed by several companies and research institutes. It creates high demands on the inspection of parts and tools, especially in the field of in-situ abrasion detection of the forming tool and its impacts on the work piece. This manuscript introduces two optical testing methods for fulfilling these inspection tasks: On the one hand the endoscopic fringe projection as a flexible small scale optical measurement principal with high depth of focus and accuracy for the acquisition of filigree form elements for a continuous abrasion determination and one the other hand the multi-scaled fringe projection for a holistic one shot measurement of the work piece for an adapted, multiscale deviation analysis. The development and advantages of both systems for the sheet bulk metal forming process are shown as well as potentials of the combination of the both systems close to the proposed application next to the production line.