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Design of a Thermal Battery Dummy with Integrated sensor Node 32

Design of a Thermal Battery Dummy with Integrated Sensor Nod...

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32nd IEEE International Symposium on Industrial Electronics, ISIE 2023

作者： Grubmuller, Michael Schweighofer, Bernhard Wegleiter, Hannes Graz University of Technology Institute of Electrical Measurement and Sensor Systems Graz Austria

ISBN: (纸本)9798350399714

High-performance Li-ion battery systems require sophisticated thermal management to ensure safe operation and long battery life. Testing such thermal management systems comes with some disadvantages and safety concerns. For this reason, the use of thermal battery dummies is advantageous. In this work, we present the design of a thermal battery dummy with 26650 cylindrical cell geometry with an integrated sensor node. The control of the heating power and the temperature measurement is done inside the dummy cell. Power supply and communication with a test bench computer are done through the supply lines. Thus, the only cell connections are the battery terminals, resulting in a dummy cell with geometric characteristics equivalent to a real Li-ion cylindrical cell. This and an addressing-based communication protocol allows parallel operation of multiple battery dummies in a dummy pack compound. The design of the thermal parameters is based on preceding thermal measurements on a real battery cell;in the following we explain the concept of the thermal dummy and go into more detail on the main electronic circuits. With final measurements on a prototype we show the achieved properties of the thermal dummy. © 2023 IEEE.

关键词： sensor nodes

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Evaluation of low-cost sensing fibers in a fiber optic current sensor used for DC measurements in the power grid

Evaluation of low-cost sensing fibers in a fiber optic curre...

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Optica Sensing Congress 2023, AIS, FTS, HISE, sensors, ES 2023 - Part of Optical sensors and Sensing Congress 2023

作者： Mandl, Johannes Trampitsch, Philipp Klambauer, Reinhard Bergmann, Alexander Institute of Electric Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33 Graz8010 Austria

Two types of low-cost sensing fiber are evaluated in an inline fiber optic current sensor designated for use in the power grid. The fibers are investigated in terms of linear current response and sensitivity. © 2... 详细信息

ISBN: (纸本)9781957171241

关键词： Costs

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Evaluation of the Durability of Fiber Bragg Grating sensors in Lithium-Ion Pouch Cells Over Six Months

Evaluation of the Durability of Fiber Bragg Grating Sensors ...

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Optica Sensing Congress 2023, AIS, FTS, HISE, sensors, ES 2023 - Part of Optical sensors and Sensing Congress 2023

作者： Unterkofler, Johanna Klambauer, Reinhard Bergmann, Alexander Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33/I Graz8010 Austria

ISBN: (纸本)9781957171241

Temperature monitoring of lithium-ion batteries is very important because aging is temperature dependent. In this work, we integrated fiber B ragg g rating (FBG) sensors into a pouch cell and evaluated the stability of the sensitivity over a period of six months. The FBGs were calibrated once a month. Good stability of the fibers was found. © 2023 The Author (s).

关键词： Fiber Bragg gratings

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Long-Term Stability Study of Fiber Bragg Grating sensors Integrated into a Lithium-Ion Pouch Cell

Long-Term Stability Study of Fiber Bragg Grating Sensors Int...

引用

2023 European Workshop on Optical Fibre sensors, EWOFS 2023

作者： Unterkofler, Johanna Klambauer, Reinhard Bergmann, Alexander Institut of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33/I Graz8010 Austria

ISBN: (纸本)9781510665002

Monitoring the temperature of lithium-ion batteries (LiB) is crucial for safe operation. The degradation of a LiB is highly dependent on temperature. It is desirable to keep the LiB within a temperature window between 15 ◦C and 35 ◦C. Otherwise, enhanced degradation will take place. So far, only the surface temperature of a LiB at a single point is measured, but the internal temperature can be significantly higher during operation. In this work, we integrated fiber Bragg grating (FBG) temperature sensors into lithium-ion pouch cells and evaluated the stability of the sensitivity of the FBG sensors over four months. Two prototype pouch cells were manufactured each with two fibers. Each fiber has three FBGs inscribed, hence there are six temperature measurement points per pouch cell. The FBG temperature sensors comprise a polyimide-coated fiber with the three inscribed FBGs and a polyimide-coated fused silica capillary. The capillary mitigates the influence of external strain on the FBGs because the fiber can move freely in the capillary due to the single mounting point on one side of the capillary. The sensitivity was measured once a month for a period of four months. Although, the Bragg wavelength changed over time, and baseline correction is required for reliable temperature calculation. The measurements show comparable stability of sensitivity over time with another publication. © 2023 SPIE.

关键词： Fiber Bragg gratings

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Photothermal Gas Sensing with a Custom-Made, Fiber-Coupled Fabry-Pérot Etalon 5

Photothermal Gas Sensing with a Custom-Made, Fiber-Coupled F...

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Applied Optical Metrology V 2023

作者： Tanzer, M. Lang, B. Bergmann, A. Graz University of Technology Institute of Electrical Measurement and Sensor Systems Inffeldgasse 33I Graz8010 Austria

ISBN: (纸本)9781510665583

Growing awareness of the adverse health effects of nitrogen oxides has increased the demand for reliable, sensitive and mass-producible sensor systems. Photothermal interferometry has shown great promise towards sensitive, selective and miniaturized sensor solutions. This work describes the development of a macroscopic photothermal sensor system with a sensor head consisting of a low-cost, custom-made and fiber-coupled Fabry-Pérot etalon. The sensor was tested with NO2, achieving a 3σ limit of detection of 2.5 ppmv (1 s). Exhibiting little drift, a limit of detection of 100 ppbv is achievable for 200 s integration time. Compensating for the low excitation power, the normalized noise equivalent absorption was calculated to be 2.2 × 10-8 cm-1W/√Hz. The sensor system is not limited to NO2, but can be used for any gas or aerosol species, by exchanging the excitation laser source. © 2023 SPIE. All rights reserved.

关键词： Nitrogen oxides

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DC measurement in HVAC-systems: Status Quo and Recent Developments 58

DC Measurement in HVAC-Systems: Status Quo and Recent Develo...

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58th International Universities Power Engineering Conference, UPEC 2023

作者： Schachinger, Philipp Albert, Dennis Frohlich, Alexander Renner, Herwig Mandl, Johannes Trampitsch, Philipp Klambauer, Reinhard Bergmann, Alexander Schoffer, Werner Institute of Electrical Power Systems Graz University of Technology Graz Austria Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria Artemes GmbH Eibiswald Austria

ISBN: (纸本)9798350316834

The measurement of small direct currents in presence of high AC currents on high voltage potential is a challenging task. Inductive current transducers (CT) are not able to measure DC and other non-conventional CTs are also not designed for DC. Therefore, DC measurements are done in transformer neutral points on ground potential. In this work, the state of the art on DC measurements in the high-voltage transmission grid is given, including the measurement in the transformer neutral point, the indirect measurement with the differential magnetometer method, and the indirect method of measuring a compensating current. In addition an optical current measurement system under development is presented. © 2023 IEEE.

关键词： DC transformers

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A 4 Bit Segmented Current-Steering Harmonic-Cancelling Digital-to-Analog Converter for High Frequency Sine-Wave Synthesis

A 4 Bit Segmented Current-Steering Harmonic-Cancelling Digit...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Maximilian Scherzer Mario Auer Institute of Electrical Measurement and Sensor Systems Graz University of Technology

ISBN: (数字)9798350378771

ISBN: (纸本)9798350378788

Sinusoidal signal generators are critical in various integrated circuit systems, such as mixed-signal BIST applications, RF communication systems, and electrochemical impedance spectroscopy. Digital-to-analog converters, which only need to generate a sinusoidal signal, can be realized using digital harmonic-cancelling sine wave synthesizers (DHSS). The sine wave is obtained by adding weighted and shifted square waves, resulting in a staircase approximation of the sinusoid. However, due to mismatch, the weights have some variation, resulting in decreased performance. Dynamic element matching (DEM) techniques are possible, but existing implementations require a large number of unit elements. This paper presents a segmented harmonic-cancelling digital-to-analog converter (HC-DAC) that achieves comparable performance in terms of signal quality, but with a greatly decreased number of unit elements, thereby lowering the circuit complexity. Implemented in a 180 nm CMOS technology, the 4-bit segmented HC-DAC achieves an SDR of 77 dB at 2 MHz with a power consumption of $254 \mu \mathrm{~W}$ and minimal area usage. Simulation results validate the effectiveness of the proposed design, demonstrating significant performance improvements over existing sine wave synthesizers.

关键词： Integrated circuits Power demand Synthesizers Digital-analog conversion Simulation Layout DH-HEMTs Signal generators Complexity theory High frequency

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Towards an Enhanced Metrology Analysis Procedure for Assessing Position Accuracy of Edge-Emitting Lasers to Photonic Integrated Circuits

Towards an Enhanced Metrology Analysis Procedure for Assessi...

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2024 IEEE Photonics Conference, IPC 2024

作者： Hinum-Wagner, Jakob Wilhelm Kraft, Jochen Sidorov, Victor Hoermann, Samuel Feigl, Gandolf Bergmann, Alexander Ams Osram Group Tobelbaderstraße 30 Premstaetten8054 Austria Graz University of Technology Institute of Electrical Measurement and Sensor Systems Inffeldgasse 33 Graz8010 Austria

ISBN: (纸本)9798350361957

Advanced photonic integrated systems require precise light source coupling, especially with edge-emitting lasers. This paper discusses how passive 2D alignment achieves below-micron accuracy. It introduces a metrology procedure for consistent analysis of the positioning process in manufacturing, ensuring optimal performance and reliable failure analysis. © 2024 IEEE.

关键词： Photonic integrated circuits

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Fiber Optic Current sensor Prototype for Low DC measurements in the Power Grid 13

Fiber Optic Current Sensor Prototype for Low DC Measurements...

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13th IEEE International Workshop on Applied measurements for Power systems, AMPS 2023

作者： Mandl, Johannes Trampitsch, Philipp Schachinger, Philipp Albert, Dennis Klambauer, Reinhard Bergmann, Alexander Institute of Electrical Measurement and Sensor Systems Graz University of Technology Graz Austria Institute of Electrical Power Systems Graz University of Technology Graz Austria OMICRON Electronics GmbH Graz University of Technology Graz Austria

ISBN: (纸本)9798350312409

Our society is dependent on a continuous supply of electrical energy. Therefore, it is essential to closely monitor all occurring signals in the transmission grid to assess their effect on the grid's components and security of supply. In particular, the time course and distribution of direct currents such as geomagnetically induced currents is of great interest. In this paper, we report progress on the development of a fiber optic current sensor intended to observe direct currents on all three phases of a high-voltage power grid. The device exploiting the Faraday effect can be described in a theoretical model using Jones formalism. We calculated the sensor scale factor when using twisted single-mode and spun HiBi fiber as the sensing head, giving implications on the applicability of those fibers for a highly sensitive fiber optic current sensor. Laboratory results of the sensor prototype show a linear current relationship for currents below 1 A. © 2023 IEEE.

关键词： Fibers

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Telemetric position sensing using resonant frequency parametrization of a millimeter-wave metamaterial

Telemetric position sensing using resonant frequency paramet...

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sensors and Communication Technologies in the 1 GHz to 10 THz Band 2024

作者： Töfferl, Michael Schossmann, A. Schmidt, C. Banzer, P. Bergmann, A. Graz University of Technology Department of Electrical Measurement and Sensor Systems Inffeldgasse 33/I GrazA-8010 Austria University of Graz Department of Physics Universitätsplatz 5 GrazA-8010 Austria

ISBN: (纸本)9781510681149

Due to its ability to meet requirements such as e.g. telemetry, millimeter-wave transceiver technology has gained research interest for various sensor applications, including the automotive and consumer sector. This work presents a resonant metamaterial for millimeter-waves that enables telemetric position sensing. The concept is based on a resonant unit cell that can be tuned to enable position encoding. A 2D metamaterial design was developed to parametrize the resonance frequency via a geometric parameter of the structure. The tuneable range of the metamaterial was estimated using a finite element method (FEM) simulation. This allowed for a unique mapping of resonance frequency and the geometric parameter, where a linear range for the sensor effect was selected. The resonance frequency shift encodes the absolute position via the geometry parameter of the metamaterial. A linear position encoded bar was fabricated using well-known PCB manufacturing techniques for position determination. The position encoded metamaterial was successfully tested with a vector network analyser under lab conditions. This telemetric position sensor concept offers a compact and contactless readout without mechanical interference with the moving object. The metamaterial is completely passive, resulting in low maintenance and failure issues. The overall sensor concept includes a state-of-the-art radar chip as millimeter-wave transceiver which is currently under development. © 2024 SPIE.

关键词： metamaterial millimeter-wave position sensing

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