Jahr | Name |
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2022 |
Methods— A Simple Method to Measure In-Plane Electrical Resistance of PEM Fuel Cell and Electrolyzer Catalyst LayersL. Bohn, M. von Holst, E. Cruz Ortiz, M. Breitwieser, S. Vierrath, C. Klose J. Electrochem. Soc., 169 (5), 054518, doi: 10.1149/1945-7111/ac6e09 |
2022 |
Fully Hydrocarbon Membrane Electrode Assemblies for Proton Exchange Membrane Fuel Cells and Electrolyzers: An Engineering PerspectiveH. Nguyen, C. Klose, L. Metzler, S. Vierrath, M. Breitwieser Adv. Energy Mater. 2022, 2103559, doi: 10.1002/aenm.202103559 |
2021 |
Development and Construction of a Parameterizable Condition Classification System for Electromagnetic Proportional Valves using Neuronal Networks (Nemoh / Neuromorphe Hardware für Anwendungen mit KI)D. Rossbach, M. Rüb, M. Kuderer, Y. Manoli MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany Kurzfassung einblendenIn this paper the development of a compact condition classification system for electromagnetic proportional valves is shown. It allows the generation of training data as well as a fast testing and comparison of different trained neuronal networks. By using quantization and pruning, a neuronal network with drastically reduced complexity has been created, so an FPGA implementation was possible. The developed and implemented network shows a very high classification rate and can distinguish 12 different error reasons of the valves. The system requires the measurement of the supply current only, which allows a simple integration of such a false detection circuitry into existing systems. In the future, the system can be modified easily, e.g. to use and test a hardware based AI accelerator instead of the FPGA implementation.
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2021 |
Entwurf einer CMOS-integrierten, rauscharmen Stromausleseschaltung mit niedriger Eingangskapazität für die medizinische Diagnostik via biologischer NanoporenM. Amayreh, S. Elsaegh, N. Butz, M. Kuderer, Y. Manoli MikroSystemTechnik Kongress 2021, 08.11.2021 - 10.11.2021, Stuttgart-Ludwigsburg, Deutschland |
2021 |
Delta-Kodierung zur Reduzierung der Datenrate in neuronalen Sonden mit In-Situ Delta-Sigma Analog-Digital-Wandler Front-EndD. Wendler, J. Koerber, D. De Dorigo, R. Willaredt, Y. Manoli MikroSystemTechnik Kongress, 08.-10. November 2021, Ludwigsburg |
2021 |
A 0.00378mm2 Scalable Neural Recording Front-End for Fully Immersible Neural Probes Based on a Two-Step Incremental Delta-Sigma Converter with Extended Counting and Hardware ReuseD. Wendler, D. De Dorigo, M. Amayreh, A. Bleitner, M. Marx, Y. Manoli IEEE International Solid- State Circuits Conference (ISSCC), 13.-22. Februar 2021, San Francisco, CA, USA |
2021 |
Active Charge Balancer With Adaptive 3.3 V to 38 V Supply Compliance for Neural StimulatorsN. Butz, U. Kalita, Y. Manoli IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 68, issue 10, Electronic ISSN: 1558-0806, DOI: 10.1109/TCSI.2021.3101550 |
2021 |
Vapor HF Etching Based Surface Micromachining Process for Fabricating a Micromechanical Sterilization Cycle CounterR. Vora, I. Spies, D. Hoffmann, H. Trautner, C. Blattert, A. Dehé MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany Kurzfassung einblendenIt is mandatory for manufacturers of reusable medical devices to specify the maximum of allowed sterilization cycles. This work focuses on the fabrication of an autonomous sterilization cycle counter in MEMS technology. Surface microm-achining is applied utilizing vapor HF (vHF) etching and subsequent polymer anti-stiction coating as an efficient tech-nique to remove sacrificial buried oxide layers and to release micro structure without stiction. The vHF etching process has been optimized and reaches etch rates of 900 nm/min for the buried oxide with a uniformity of more than 95 % across a 100 mm wafer. Based on this process a compatible design with perforated structures is implemented. Finally, devices of the sterilization cycle counter are successfully tested by a simulated sterilization cycle temperature test.
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2021 |
Optimization of a High-g Acceleration Sensor for Crash-test ApplicationA. Srivastava, J. Rockstroh, A. Dehé MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany Kurzfassung einblendenPiezoresistive accelerometers are a popular and widely used method of acceleration sensing due to their simplicity in fabrication, packaging and inherent ruggedness. These devices usually have simpler electronics for example compared to capacitive sensors. There are products available without ASICs as well. [1] This work takes an existing high-g piezoresistive accelerometer as a reference sensor and works on optimizing this design. The work delves into different design and optimization techniques to deliver novel high-performance piezoresistive acceleration sensor prototypes. These techniques exploit the device physics and mechanics to point towards the new designs. The sensor is designed and optimized to have higher bandwidth. The adaptation of SOI wafers instead of currently used epitaxial wafers, results in smaller chip size, enabling more chips/wafer and reducing the sensor cost. Extra emphasis has been laid to maintain high sensitivity, for specified doping of the piezoresistors, while still not compromising much on the resonance frequency. Finite element analysis with ANSYS Workbench offers insights into the device performance and helps in the determination of some key sensor parameters for the new designs. It also helps to establish trends and this provides an idea for the successive models. After several iterations and incorporating different optimization techniques, new models are achieved.
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2021 |
Development of a hybrid microsystem for acquisition of sterilization cyclesD. Hoffmann, H. Trautner, S. Spieth, S. Herrlich, K. Pagel, A. Dehé MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany Kurzfassung einblendenIn this paper we present a hybrid microsystem for acquisition and counting of sterilisation cycles. The device includes a micromechanical counter mechanism and a thermal actuator based on a shape memory alloy (SMA). The device is designed to count 100 sterilization cycles. The basic functionality is investigated on a hotplate using a thermal temperature profile with a peak temperature of 135 deg C. In this manner, counting of thermal cycles is demonstrated.
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2021 |
A Non-Linear Lumped Model for the Electro-Mechanical Coupling in Capacitive MEMS MicrophonesS. Anzinger, C. Bretthauer, D. Tumpold, A. Dehé Journal of Microelectromechanical Systems 30 (3), 360-368, doi: 10.1109/JMEMS.2021.3065129 Kurzfassung einblendenThis work provides an analytical non-linear model for the capacitive transduction in MEMS transducers with perforated counter-electrodes, especially applicable to capacitive MEMS microphones. Starting from an electrostatic description of a perforated unit cell of the transducer, analytical formulations of the variable capacitance and electrostatic forces are derived, accounting for the deflection profile of a clamped circular plate. A lumped implementation into conventional circuit simulations tools is enabled via behavioral modeling based on hardware description languages, such as Verilog-A. Therefore, the analytical model is approximated via Taylor series expansions, allowing for a stable and non-linear behavioral implementation. The resulting model finally enables both a small- and large-signal analysis of capacitive MEMS microphones, precisely accounting for non-linearities in the capacitive transduction. This allows to simulate the harmonic distortion of the microphone's output signal and to account for electrostatic spring-softening in simulations of its bias voltage dependent sensitivity.
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2021 |
Development of A Z-Axis Out of Plane MEMS AccelerometerA. Basavanna, M. Dienger, J. Rockstroh, S. Keller, A. Dehé 2021 IEEE 34th International Conference on Micro Electro Mechanical Systems (MEMS), 25-29 Jan. 2021, Gainesville, USA Kurzfassung einblendenMEMS are minute electro-mechanical systems that are able to sense small changes in the environment and are responsible for a large chunk of the sensor market. MEMS inertial sensors such as gyroscopes and accelerometers have helped in realizing new products across a multitude of fields. One of the next aspects of MEMS Inertial sensors is the Internet of Things [IOT] and Industry 4.0. Hence, the following work depicts a sensor element design for vibration detection in Out Of Plane [OOP] axis (z-axis) proposed for closed loop control considering a system bandwidth of 20 kHz. The current work highlights the concept of an "anti-phase" design type sensor element developed considering either top or bottom electrodes allowing for the possibility of closed loop control. The translational motion of the sensor element along with the larger mass elements provides higher performance and lower noise. The analysis indicates a sensor element with size 1mm*1mm showcasing a specific open loop sensor sensitivity per area of 1.12 nF/g/m 2 with resonance frequency of 10.5 kHz and can be considered as a viable alternative to see-saw design type.
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2021 |
Printed low-voltage crossbar-puf for identificationA. Scholz, L. Zimmermann, A. Sikora, M. B. Tahoori, J. Aghassi-Hagmann 2021 IEEE International Flexible Electronics Technology Conference (IFETC), pp. 62-66, 08. - 11. August 2021 |
2021 |
Classification of cow behaviour for sensor assisted alpine milk productionT. Peikenkamp, D. Plaia, T. Hehn, D. Gaida, M. Hoenen, A. Ule 72nd Annual Meeting of the European Federation of Animal Science (EAAP), p. 387, 30.08. - 03.09.2021, Davos, Schweiz |
2021 |
SESAM sensor technology for milk producersL. Dale, Z. Vassilev, J. Bieger, K. Droessler, F. J. Auer, M. Erhart, T. Hehn, T. Peikenkamp, M. Klopcic, A. Werner, M. Hoenen 72nd Annual Meeting of the European Federation of Animal Science (EAAP), p. 386, 30.08. - 03.09.2021, Davos, Schweiz |
2021 |
Telemetrische Verformungsmessung mit einem CMOS-integrierten SensorchipT. Hehn, H. Rietsche Sensor und Test 2021, 04. - 06. Mai 2021, Online |
2021 |
Joystick mit mehrachsigem MiniaturkraftsensorT. Hehn Innovationstag des Bundesministeriums für Wirtschaft und Energie (BMWi), 17.06.2021, Online |
2021 |
Multi-Axis Micro Force Sensor Based on a CMOS Integrated ChipB. Folkmer, T. Hehn, M. Köhler, A. Willmann, D. Landler-Gärtner, A. Dehé Mikrosystemtechnik-Kongress 2021, 9. - 10. November 2021, Ludwigsburg |
2021 |
A performance-based tabular approach for joint systematic improvent of risk control and resilience applied to telecommunication grid, gas network, and ultrasound localization system (MERLIN)I.Häring, M. Fehling-Kaschek, N. Miller, K. Faist, S. Ganter, K. Srivastava, A.K. Jain, G. Fischer, J. Finger, A. Stolz, T. Leismann, S. Hiermaier, M. Carli, F. Battisti, R. Makri, G. Celozzi, M. Belesioti, E. Sfakianakis, E. Agrafioti, A. Chalkidou, G. Papadakis, C. Fuggini, F. Bolletta, A. Neri, G. Giunta, H. Scheithauer, F. Höflinger, D.J. Schott, C. Schindelhauer, S. Köhler, I. Linkov Springer nature, Environment Systems and Decisions 41, 286–329 (2021) Kurzfassung einblendenOrganizational and technical approaches have proven successful in increasing the performance and preventing risks at socio-technical systems at all scales. Nevertheless, damaging events are often unavoidable due to a wide and dynamic threat landscape and enabled by the increasing complexity of modern systems. For overall performance and risk control at the system level, resilience can be a versatile option, in particular for reducing resources needed for system development, maintenance, reuse, or disposal. This paper presents a framework for a resilience assessment and management process that builds on existing risk management practice before, during, and after potential and real events. It leverages tabular and matrix correlation methods similar as standardized in the field or risk analysis to fulfill the step-wise resilience assessment and management for critical functions of complex systems. We present data needs for the method implementation and output generation, in particular regarding the assessment of threats and the effects of counter measures. Also included is a discussion of how the results contribute to the advancement of functional risk control and resilience enhancement at system level as well as related practical implications for its efficient implementation. The approach is applied in the domains telecommunication, gas networks, and indoor localization systems. Results and implications are further discussed.
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2021 |
Characterization of hermetically sealed metallic feedthroughs through injection-molded epoxy-molding compoundsMehmet Haybat, Thomas Guenther, Romit Kulkarni, Serhat Sahakalkan, Tobias Grözinger, Thilo Rothermel, Sascha Weser and André Zimmermann Applied Mechanics, MPDI Kurzfassung einblendenElectronic devices and the associated sensors are exposed to increasing mechanical, ther- 12 mal and chemical stress in modern applications. In many areas of application, the electronics are 13 completely encapsulated with thermosets in a single process step using the injection molding tech- 14 nology, especially with epoxy molding compounds (EMC). The implementation of the connection 15 of complete systems for electrical access through a thermoset encapsulation is of particular im- 16 portance. In practice, metal pin contacts are used for this purpose, which are encapsulated together 17 with the complete system in a single injection molding process step. However, this procedure con- 18 tains also challenges because the interface between the metallic pins and the plastic represents a 19 weak point for reliability. In order to investigate the reliability of the interface, metallic pin contacts 20 made of copper-nickel-tin alloy (CuNiSn) and bronze (CuSn6) are encapsulated with standard EMC 21 materials within the scope of this study. The metal surfaces made of CuNiSn are further coated with 22 silver (Ag) and tin (Sn). An injection molding tool to produce test specimens is designed and man- 23 ufactured according to the design rules of EMC processing. The reliability of the metal-plastic in- 24 terfaces are investigated by means of shear and leak tests. The results of the investigations show 25 that the reliability of the metal-plastic joints can be increased by using different material combina- 26 tions. |