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Analytical Description of Transversally Symmetric Hinges with Semicircular Contours 16th

Analytical Description of Transversally Symmetric Hinges wi...

引用

16th International Federation of Theory of Machines and Mechanisms World Congress, IFToMM WC 2023

作者： Jahn, Hannes Fröhlich, Thomas Zentner, Lena TU Ilmenau Department of Mechanical Engineering Mechanics of Compliant Systems Group Ilmenau98693 Germany TU Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Ilmenau98693 Germany

ISBN: (纸本)9783031457081

Compliant mechanisms are becoming increasingly important, especially in force measurement and weighing technology, due to their zero backlash, wear resistance, and zero friction. Their deformation under external forces can be analyzed well with analytical calculations and FEM simulations. Analytically, only mechanisms with symmetrical and longitudinally symmetrical hinges are described. This paper presents a method that allows transversally symmetric hinges to be described analytically. The model must be computed numerically due to the built neutral fiber and the nonlinearities in the used calculation method. The developed method is then compared with FEM calculations in a parameter study and considered to be validated. Finally, outlooks are formulated on how the created method can for instance be used to develop load cells for later calculations. Moreover, it is shown to what extent it is possible to implement this method for general calculations of compliant mechanisms. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Hinges

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Excitation Period Optimization of Photothermal Signals for Gas Sensing

Excitation Period Optimization of Photothermal Signals for G...

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Applied Industrial Optics: Spectroscopy, Imaging and Metrology, AIO 2022

作者： Radeschnnig, Ulrich Lang, Benjamin Bergmann, Alexander Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33/I Graz8010 Austria

Photothermal spectroscopy is a promising technique for monitoring gas concentrations. We provide an approach to signal enhancement relying upon the ratio between excitation frequency and gas flow velocity. Our stateme... 详细信息

ISBN: (纸本)9781957171081

关键词： Flow velocity

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Loss-engineering of a bimodal waveguide interferometer: An optimized silicon nitride platform for chemical and biological sensing 13

Loss-engineering of a bimodal waveguide interferometer: An o...

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Optical Modeling and Performance Predictions XIII 2023

作者： Hörmann, Samuel M. Hinum-Wagner, Jakob W. Bergmann, Alexander ams-OSRAM AG Tobelbaderstraße 30 Premstaetten8141 Austria Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33 Graz8010 Austria

ISBN: (纸本)9781510665422

Integrated photonic sensors are promising devices to detect the presence of biological and chemical substances. Especially, silicon photonics features scalable, compact, and robust applications in, inter alia, the medical, pharmaceutical, and chemical industries for decentralized, real-time sensing. In an effort to continuously lower the limit of detection and build ultra precise devices, their sensitivity is steadily increased. The optical loss, however, is often neglected. This reduces the available intensity in the transmission spectrum and, thus, restricts the achievable limit of detection. We optimize a bimodal waveguide interferometer for environmental sensing based on a silicon nitride platform. Thereby, we combine considerations regarding the sensitivity, optical loss, and coupling into a figure of merit to design the single-mode and the bimodal platforms. To that end, we utilize a recently developed model of surface-roughness-induced scattering to include the estimated propagation loss in the design process. This model uses the simulated modes and measured autocovariance in the surface roughness for an estimation of the propagation loss in the real platform. We observe that considering the optical loss favors platforms of medium height for a quasi-transverse-electric polarization. In consequence, we demonstrate drastic changes in the design choices compared to pure sensitivity-focused waveguide platforms. Thus, we show that a holistic design process is essential to fully utilize the potential of integrated photonic devices. Ultimately, we are convinced that this methodology will be beneficial in making integrated photonic sensors more sensitive. © 2023 SPIE.

关键词： Surface roughness

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CART-based optimization of core and cladding layers in silicon nitride photonic integrated circuits towards propagation and bend loss minimization 4

CART-based optimization of core and cladding layers in silic...

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Emerging Applications in Silicon Photonics IV 2023

作者： Hinum-Wagner, Jakob Wilhelm Scheibelhofer, Peter Hörmann, Samuel Marko Schmidt, Christoph Feigl, Gandolf Kraft, Jochen Bergmann, Alexander Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33 Graz8010 Austria Ams-OSRAM Ag Tobelbaderstra e 30 Premstaetten8141 Austria

ISBN: (纸本)9781510668416

In the burgeoning field of sensing, Photonic Integrated Circuits (PICs) are essential tools for precise, high-speed detection of biological markers and particles. The performance of these biosensors is intricately linked to the losses of PICs, which is largely determined by the configuration of their core and cladding layers. Recognizing this, the present study ventures into the optimization of these layers in Silicon Nitride (Si3N4) PICs, employing an innovative approach using Classification and Regression Trees (CART). The study identifies propagation and bend losses, two critical factors affecting PIC performance, as response variables. In contrast, the physical characteristics of the core and cladding layers are considered as input variables. To ensure the robustness and completeness of the study, an appropriate Design of Experiments (DOE) is implemented, meticulously exploring possible combinations of layer configurations. Following the DOE, the CART algorithm is then applied to this design space, whereas the losses act as response variables. The algorithm functions by partitioning the design space into regions associated with specific layer configurations and iteratively refines these partitions based on their corresponding impact on propagation and bend losses. The end results of this process is the statistical information about the layer stacks which come with significantly low propagation and bend losses, thereby enhancing PIC performance. This improvement in performance directly translates to heightened sensitivity and specificity in biosensors. Further, the application of the CART methodology has demonstrated its potential to streamline the PIC design process, enhancing its robustness, an aspect critical for practical implementation in fabrication environments. © 2023 SPIE.

关键词： Design of experiments

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Integrated interferometer design for zero cross-sensitivity to matrix perturbations 26

Integrated interferometer design for zero cross-sensitivity ...

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Novel Optical systems, Methods, and Applications XXVI 2023

作者： Hörmann, Samuel M. Hinum-Wagner, Jakob W. Bergmann, Alexander ams OSRAM Group Tobelbader Strasse 30 Premstaetten8141 Austria Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33 Graz8010 Austria

ISBN: (纸本)9781510665446

Integrated photonic biosensors constitute an important technology for the growing point-of-care paradigm. Due to their high sensitivity and ample design freedom, interferometric sensors are an attractive embodiment for this application. In an effort to continuously lower the limit of detection and build ultra-precise devices, the sensitivity is steadily increased. Thereby, the limiting factors are optical loss, noise, and cross-sensitivities to external perturbations. We present a novel design method for integrated interferometers to inherently compensate for the cross-sensitivity to bulk perturbations in the matrix’s refractive index. We exploit that the analyte induces a localized effect when binding to the bioreceptors. By using different guided modes with engineered phase signals in the interferometer, we distinguish between analyte binding and bulk perturbations. To first order, their optical path may be designed such that the relative change due to bulk perturbations vanishes while sensitivity to the analyte is retained. We demonstrate this methodology via simulations of a Mach-Zehnder-interferometer for an immunosensor based on a silicon nitride platform. We show that this design may be easily incorporated in most conventional layouts, due to an excess of degrees of freedom, and could further be applied in fiber-based devices. In this manner, interferometers utilizing guided modes could compensate cross-talk for perturbations in the matrix’s temperature, pH, or general chemical composition. We believe that eliminating these limiting external impacts could help integrated photonic biosensors to overcome current issues with reliability and robustness. © 2023 SPIE.

关键词： Refractive index

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State of Charge-Dependent Changes in Spectral Composition of Guided Lamb Waves in Lithium-Ion Batteries

State of Charge-Dependent Changes in Spectral Composition of...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Swaschnig, Patrick Klambauer, Reinhard Kofler, Johannes Bergmann, Alexander Graz University of Technology Institute of Electrical Measurement and Sensor Systems Graz Austria Tdk Electronics GmbH & Co Og European R&d Center Deutschlandsberg Austria

ISBN: (纸本)9798350346459

This study investigates symmetrical Lamb wave behavior across varying state-of-charge levels in lithium-ion batteries. Utilizing piezoelectric transducers, the research focuses on inducing and detecting Lamb waves in lithium-ion batteries. The outcomes uncover correlations between Lamb wave characteristics and state-of-charge variations, revealing insights into the potential of Lamb waves as indicators of internal changes in battery structures. Furthermore, the influence of chemomechanical alterations within battery structures on Lamb wave properties is explored. The insights gained offer valuable implications for understanding battery performance dynamics and internal transformations. © 2023 IEEE.

关键词： Surface waves

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Automated Charging of Battery Electric Vehicles on Trains to Accelerate the Mobility Revolution

Automated Charging of Battery Electric Vehicles on Trains to...

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2024 IEEE International Conference on Green Energy and Smart systems, GESS 2024

作者： Buchroithner, Armin Birgel, Christof Bertignoll, Timon Mitter, Tobias Wellenzohn, Simon Schimanofsky, Alexander Brunnhofer, Peter Demuth, Sebastian Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria SSC Railtec GmbH Graz Austria Easelink GmbH Graz Austria RCC Railway Competence and Certification GmbH Graz Austria Institute of Structural Durability and Railway Technology Graz University of Technology Graz Austria

ISBN: (纸本)9798350379617

The decarbonization of the transport sector, covering cargo as well as passenger mobility, plays a key role in the context of the energy revolution as it contributes to 24% of the global CO2 emissions. Battery electric vehicles (BEVs) are part of the solution, especially if their specific drawbacks, such as limited range and availability of charging infrastructure, are mitigated by combining them with electrified rail transport. This paper describes the implementation of partially automated BEV charging capabilities into rail wagons (motorail), with an emphasis on electric power flow from the overhead catenary system to the BEVs. First, a requirement profile is determined based on different use cases, leading to several design variants relying on different power electronics modules. Subsequently, an automated underbody charging interface for the BEV is discussed in depth supported by actual test rig data. © 2024 IEEE.

关键词： Charging stations

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Shielding of Eddy Current Displacement sensors with a Single Backside Shield

Shielding of Eddy Current Displacement Sensors with a Single...

引用

IEEE sensorS

作者： G. Gruber M. Neumayer B. Schweighofer H. Wegleiter Christian Doppler Laboratory for Measurement Systems for Harsh Operating Conditions Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

Eddy current displacement sensors (ECDS) are essential for accurate position measurement in heavy industries. For instance, in steel plants, position sensor systems often need to measure large displacements and withstand high temperatures, dirt, and dust exposure. Various protective measures, such as metal shields or chain curtains, create a restricted environment for such sensors and cause interference. Shielding techniques must be used to reduce this interference. However, due to spatial restrictions, established shielding techniques cannot always be applied. This study presents a design approach for a single-coil ECDS that reduces the effects of metal objects on the measurement signal by using a single backside shield. The accuracy of the proposed measurement system is improved by integrating shielding measures and selecting a suitable measurement frequency. This improvement is demonstrated through the lab measurements. The measures provide a basis for reliable position measurement with ECDS in harsh environments.

关键词： Temperature measurement Temperature sensors Coils Current measurement Metals Interference Position measurement sensors Frequency measurement Eddy currents

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Deciphering Anion Exchange Membrane Water Electrolysis: A Distribution of Relaxation Times Approach

Deciphering Anion Exchange Membrane Water Electrolysis: A Di...

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24th Symposium on Polymer Electrolyte Fuel Cells and Water Electrolyzers, PEFC and WE 2024, held at the PRiME 2024 Meeting

作者： Ranz, M. Grabner, B. Schweighofer, B. Wegleiter, H. Trattner, A. HyCentA Research GmbH Inffeldgasse 15 Graz8010 Austria Graz University of Technology Institute of Electrical Measurement and Sensor Systems Inffeldgasse 23 Graz8010 Austria Graz University of Technology Institute of Thermodynamics and Sustainable Propulsion Systems Inffeldgasse 19 Graz8010 Austria

ISBN: (纸本)9781623326630

Anion exchange membrane water electrolysis (AEM-WE) is a promising method for hydrogen production, offering advantages over proton exchange membrane water electrolysis (PEM-WE), such as the use of nonprecious metal catalysts and pertluoro sulfonic acid free membranes. Despite achieving impressive current densities, challenges in efficiency and stability remain. This study employs electrochemical impedance spectroscopy (EIS), the equivalent circuit model (ECM) and distribution of relaxation times (DRT) analysis to investigate AEM-WE cells. DRT analysis identifies and quantifies five loss mechanisms within the AEM-WE system, including hydrogen and oxygen evolution reactions and ionic transport losses. Long-term experiments reveal catalyst degradation and its impact on performance, providing insights for targeted optimisation. The findings enhance understanding of the electrochemical processes in AEM-WE, offering pathways to improve stability and efficiency. © The Electrochemical Society.

关键词： Nafion membranes

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A Wiener Filter Based Band-Pass FIR Differentiator with Zero Delay

A Wiener Filter Based Band-Pass FIR Differentiator with Zero...

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IEEE Instrumentation and measurement technology Conference

作者： M. Neumayer H. Wegleiter T. Bretterklieber Christian Doppler Laboratory for Measurement Systems for Harsh Operating Conditions Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

The calculation of signal derivatives is a sensitive operation in digital signal processing. This is due to the high pass nature of the derivative operation and the subsequent noise amplification. Bandlimited differentiator designs based on FIR approximations are therefore commonly used. Another prominent technique is Savitzky-Golay-filtering to design FIR differentiators. However, all of these techniques introduce a temporal shift by the (constant) group delay of the odd FIR filters. In this work we present a FIR differentiator design for band-pass signals based on a Wiener filter approach. Therefore, the differentiation task is treated as a signal estimation problem, which leads to a delay free FIR differentiator. The design specifications for the filter, e.g. the bandwidth, are formulated in the frequency range. The properties and performance of the approach are presented by means of comparative simulation studies.

关键词： Band-pass filters Wiener filters Finite impulse response filters Simulation Frequency-domain analysis Noise Delays

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