DigitalTC FreyungBeitrag (Sammelband oder Tagungsband)
Anja Braehmer, Wolfgang Dorner
Museum Uploaded. Digitale Technologie für crossmediale grenzüberschreitende Museumskooperationen.
Online-Erweiterung zum Band 84 (2019) der Museumskunde
2020
Abstract anzeigen
Zusammen mit Projektpartnern entwickelt die TH Deggendorf digitale Technologien für eine neue stadtgeschichtliche Dauerausstellung im Stadtmuseum Deggendorf. Konkret handelt es sich hierbei um drei digitale Teilprojekte: ein Content Management System (CMS), das erlaubt die festinstallierten Medienstationen der Ausstellung zentral zu verwalten, einen digitalen Museumsbegleiter, der die Geschichten der Exponate erzählt und Zugang zu Vertiefungsebenen bietet und eine barrierefreie digitale Anwendung zur Verknüpfung von Museums-und Stadtraum.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Simon Killinger, Johannes Liebl, Rolf Rascher
First steps towards an automated polishing process chain using one robot
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2564840
Abstract anzeigen
Manufacturing precision optics is a complex process chain, which requires many operations on different machines. This is combined with operator-dependent steps such as manual cleaning, loading and measuring. In order to realize this process chain on a smaller shop area and to achieve a higher level of automation we build an operator-independent polishing cell. In this cell, an ABB robot serves as the actuator handling the workpiece. We positioned the robot in the center of the polishing cell to operate several workstations, so the whole process chain works with one single actuator. This arrangement allows a smaller and cheaper system, since no additional handling is required.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Michael Benisch, O. Fähnle, Rolf Rascher, Werner Bogner
Force and pressure analysis during overarm polishing
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2564903
Abstract anzeigen
The Preston-equation implies, that, besides the relative speed υrel and a specific constant KP, the pressure p plays a significant role for the removal rate when polishing an optical component. This paper demonstrates a possibility for a qualitative evaluation of the pressure distribution before the polishing process. A pressure-sensitive foil is used as a gauge for pressure measurement. The effectiveness of this measuring method is explained. Specific weaknesses and limitations in the use of these foils are discussed. A method for an integrated evaluation of the pressure on different spots of the polishing pad is proposed at the end of the paper.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
M. Pohl, R. Börret, Olga Kukso, Rolf Rascher
Mid spatial frequency error prevention strategies for the grinding process
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2565261
Abstract anzeigen
This research is focused on the link between manufacturing parameters and the resulting mid-spatial frequency error in the manufacturing process of precision optics. The goal is to understand the generation mechanisms of mid-spatial frequency errors and avoid their appearance in the manufacturing process. Also, a simulation which is able to predict the resulting mid spatial frequency error from a manufacturing process is desired.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Jessica Stelzl, Christine Wünsche, S. Höfer
Influencing factors for a continuous wave UV-laser component
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2564916
Abstract anzeigen
During the development of an optical system, one comes to the point where you have to build the optically active element into a mechanical device that becomes part of the system. At this point you come across the well-known question that it is not only necessary to consider and ensure the quality of the individual element. It is also important to look at the entire component in order to identify potential influencing factors on the performance of the optical system. At the beginning of a two-year project at Technologiecampus Teisnach the polishing process of a nonlinear crystal as the crucial component of the optical system was being explored. This system is designed to create continuous wave laser beams in the deep UV range. The crystal has to be embedded between two prisms. Roughness and shape of the crystal is ensured via the polishing process which alone has many influencing factors and was examined at the beginning of the project. The quality of the crystal can be as good as it can be, but if the contacting prisms do not fit, the whole prism-coupled device will become unusable in the overall optical laser system. The performance of the laser can only be achieved by harmonizing all elements of the PCD and the PCD itself into the laser set-up. In the current phase of the project this question will be dealt with. The prism-coupled device is split up into its individual parts, which are the nonlinear crystal, the prisms as optical auxiliary components, micro screws and mechanical support. Going through the requirements to the properties of the crystal and their limitations, the influence of the PCD on the optical performance of the crystal is presented. Here, the main focus is placed on the mode of fixing the crystal between the prisms and on putting the stack of crystal and prisms in the laser beam. The influencing factors between the crystal, the prisms and the method of fixing the PCD are described.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Michael Wagner, Gerald Fütterer
Computer-aided beam path generation and assessment for Stevick-Paul telescopes
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2564852
Abstract anzeigen
At Deggendorf Institute of Technology a student project is currently under way to build a Stevick-Paul telescope for astrophotography. An important step in the overall development procedure of each telescope is the design of a beam-path and ensuring its suitability under optical and engineering aspects. The students performed this process in a sequential manner by using several different computer programs (e.g. MATLAB, Zemax, Creo Parametric). To accelerate the beam path design process, a Python program to automate the major part of the design process with minimum human supervision was created. The input data of the python program consists of ranges of the desired characteristics of the Stevick-Paul telescope, such as focal lengths, primary mirror diameters and tilts etc., mirror thickness and mount geometries, as well as the specific type of camera. After setting the input, the program creates 2D cross-sections of beam paths according to the formulas of D. Stevick and may introduce a flat fold mirror to reduce the overall system size as well as improve the accessibility of the focus plane. The subsequent assessment routine checks against the susceptibility for stray light and performs a complex analysis of the available installation space to ensure sufficient mechanical tolerances. In this way, collisions between mirrors, mounts and cameras are avoided and obstructions of the beam path are prevented. At any stage, the program can produce graphical representations of the beam paths. In this paper the computer-aided design of a telescope beam path with a focal length of 2400 mm is demonstrated. During development of the software, a subset of folded Stevick-Paul telescopes, in which certain components are parallel, was found. This subset may be useful to simplify the alignment procedure. In conclusion, further refinement of the software is necessary, although the program is already a useful aid for certain aspects when creating a beam path design.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Olga Kukso, Rolf Rascher, M. Pohl, R. Börret
On the metrology and analysis of MSF error
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2566251
Abstract anzeigen
The aim of our research was to study middle spatial frequency errors (MSFE) on optical surfaces. We investigate the surfaces after manufacturing processes to find out the main affecting factors and to choose the proper processing parameters to minimize the size of the errors. To find an appropriate parameter window we have to be able not only to define the factors, which lead to MSFE, but also to analyze the change of the error after next following production steps.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
M. Jung, Christian J. Trum, Beate Schmidbauer, E. Willenborg, Rolf Rascher
Non-ablative removal of sub surface damages in ground optical glass substrates by controlled melting of thin surface layers using CO2-laser radiation
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2564801
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The form generation of optical surfaces by grinding and mechanical polishing results in small sub surface damages in the form of micro cracks that conventionally have to be removed by further removal of the damaged surface layers. In order to reduce process time and material cost non-ablative methods for removal of micro cracks are desired. Utilising the low optical penetration depths of less than 10 μm for CO2-laser radiation in glass, the laser energy can be used to heat up and melt thin surface layers. Using a 1.5 kW CO2-laser, a quasi-line focus formed by a scanner unit and a constant feed speed, it is possible to close all micro cracks present in the rough grinded test surfaces (max. SSD-depth ~ 63 μm), while achieving a process time of less than 2 seconds for a Ø 30 mm N-BK7 lens, respectively 7.5 seconds for fused silica. With a Sa as low as 50 nm and low distortion from the original shape the surfaces can directly be conventionally polished, further reducing the process chain complexity.
DigitalAngewandte WirtschaftswissenschaftenTC GrafenauBeitrag (Sammelband oder Tagungsband)
Sebastian Wilhelm, Dietmar Jakob, Diane Ahrens
Human Presence Detection by monitoring the indoor CO2 concentration
Tagungsband zur Konferenz Mensch und Computer 2020 (06.-09.09.2020; Magdeburg)
2020
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Presence detection systems are becoming more and more important and are used in smart home environments in the Ambient Assisted Living (AAL) domain or in surveillance technology. Common systems focus on using motion sensors or cameras which have only a limited viewing angle and therefore monitoring gaps can easily occur within a room. Humans produce carbon dioxide (CO2) through their respiration which is distributed in rooms. As a result if one (or more) persons are in a room a significant increase in CO2 concentration in the room can be noted. With this work we investigate an approach to detect the presence or absence of people indoors by monitoring the CO2 concentration in the ambient air.
DigitalAngewandte WirtschaftswissenschaftenTC GrafenauBeitrag (Sammelband oder Tagungsband)
Sebastian Wilhelm, Dietmar Jakob, Jakob Kasbauer, Melanie Dietmeier
Organizational, Technical, Ethical and Legal Requirements of Capturing Household Electricity Data for Use as an AAL System
Proceedings of the Fifth International Congress on Information and Communication Technology (ICPCCI 2019) [20-21 February 2020; London, UK]
2020
DOI: 10.1007/978-981-15-5856-6_38
Abstract anzeigen
Due to demographic change elderly care is one of the major challenges for society in near future fostering new services to support and enhance the life quality of the elderly generation. A particular aspect is the desire to live in one’s homes instead of hospitals and retirement homes as long as possible. Therefore it is essential to monitor the health status i.e. the activity of the individual. In our data-driven society data is collected at an increasing rate enabling personalized services for our daily life using machine-learning and data mining technologies. However the lack of labeled datasets from a realistic environment hampers research for training and evaluating algorithms. In the project BLADL we use data mining technologies to gauge the health status of elderly people. Within this work we discuss the challenges and caveats both from a technical and ethical perspectives to create such a dataset.
DigitalAngewandte WirtschaftswissenschaftenTC GrafenauBeitrag (Sammelband oder Tagungsband)
Dietmar Jakob, Sebastian Wilhelm
Amazon Echo: A Benchmarking Model Review
Proceedings of the 14th International Conference on Interfaces and Human Computer Interaction (23-25 July 2020; Zagreb, Croatia)
2020
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Smart speakers are becoming increasingly popular. The market leader for smart speakers are the products of the Echo family from Amazon. There are currently 9 different models with different technical specifications available in Germany. With this paper, the models was benchmarked against each other in terms of (i) speech recognition reliability, (ii) output sound pressure and (iii) power consumption in a laboratory experiment. Previous works in this area has only considered individual models of the product family. Significant differences in speech recognition accuracy, output sound pressure and power consumption were identified between the models. In general it was observed, that the Echo Show 8 model was the most efficient in terms of the above criterias.
DigitalAngewandte WirtschaftswissenschaftenTC GrafenauBeitrag (Sammelband oder Tagungsband)
Dietmar Jakob, Sebastian Wilhelm, A. Gerl
Data Privacy Management (DPM) - A Private Household Smart Metering Use Case
[Accepted for publication]
Tagungsband zum 6. Usable Security und Privacy Workshop im Rahmen der Konferenz Mensch und Computer 2020 (06.-09.09.2020; Magdeburg)
2020
Abstract anzeigen
The automated collection of real life data in private households places special requirements on a Data Privacy Management (DPM) concept. The development and implementation of a DPM concept for use in a scientific environment is demonstrated according to a successful use case – the project BLADL. The intention of this paper is to provide a guideline for ethical and privacy-preserving data collection and management in research projects in the EU.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Sebastian Sitzberger, Johannes Liebl, Christian J. Trum, Rolf Rascher
Concept of a two-part clamping system for lenses in optical metrology
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2566547
Abstract anzeigen
The developed concept represents a universally applicable clamping system designed to fit in any measuring machine with
any measuring principle. The design ensures that, as long as the lens remains clamped, the measurement results are
reproducible. Form errors due to tension remain constant across all measuring and processing steps. The version presented
in this paper was developed especially for small lenses in the diameter range up to 40 mm. On the one hand, the design
allows for fast measurement of loose lenses. On the other hand, the device can also be used for measurement comparisons,
since lenses can also be mounted permanently. In the following, the concept and first results of measurement tests are
presented.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH TeisnachBeitrag (Sammelband oder Tagungsband)
Armin Reif, Sebastian Sitzberger, Rolf Rascher
Cutting high-performance materials with ultrasonically modulated cutting speed
Proceedings of SPIE 11478 (Seventh European Seminar on Precision Optics Manufacturing [8 July 2020; Teisnach]), Bellingham, WA, USA
2020
DOI: 10.1117/12.2565757
Abstract anzeigen
The continuing trend towards lightweight construction and the associated machining rates of up to 95 % lead to an
increased use of high-performance materials. The ever growing demands on the strength and quality of components and
the associated use of materials which are hard to machine require the further development of new, economical machining
techniques. In ultrasonic-assisted machining, an additional high-frequency vibration is superimposed on the conventional
machining process. The vibration of the tool is usually excited axially or longitudinally to the workpiece, i.e. vertical to
the cutting direction. An additional vibration overlay around the rotation axis (torsional) of the tool is also possible. This
generates a vibration overlay in the cutting direction. The vibration initiation causes vibration amplitudes in the range of a
few micrometers at the tool cutting edge. This leads in turn to a high-frequency change in the cutting speed or feed rate.
Overall, an additional torsional vibration overlap can further reduce cutting forces, increase tool life and improve
workpiece quality.
In order for a grinding tool to generate a torsional vibration, a special tool was required that had to be designed by
simulation. The formation of a torsional vibration was achieved by helical slots in the sonotrode. Depending on the angle
of rotation and the length of the slots, a part of the axial vibration is converted into a torsional vibration by an axial
excitation of the sonotrode. The aim in designing the slots was to achieve the highest possible vibration amplitude.
Following the simulation, the slots were inserted into the tool in the corresponding optimum geometric position.
Afterwards, the specially designed grinding tool was validated by machining the brittle-hard glass-ceramic material
Zerodur. The first test results with the torsionally vibrating tool are presented in the following.
Version: 2.1.2-qf2