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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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Modeling of Microwave Label-Free Microfluidic Biosensors for Cell Analysis 21

Modeling of Microwave Label-Free Microfluidic Biosensors for...

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21st International Multi-Conference on Systems, Signals and Devices, SSD 2024

作者： Rezeg, Marwa Zairi, Hassen Al-Hamry, Ammar Talbi, Malak Anurag, Adiraju Kanoun, Olfa National Engineering School of Carthage University of Carthage Research Laboratory SE & ICT Tunis Tunisia Chemnitz University of Technology Measurement and Sensor Technology Laboratory Chemnitz Germany

ISBN: (纸本)9798350374131

This paper proposes biosensors designed specifically for dielectric spectroscopy on biological cells while they are in their liquid culture medium, covering the microwave frequency spectrum from 10 GHz to 50 GHz. This frequency range is suitable for measurements with very low concentrations of cells. The biosensors are designed by integrating an inter-digitated capacitor (IDC) with a microfluidic system onto the radio frequency (RF) circuit. Microfluidic systems, on the other hand, provide device reliability prevent potential fluid leakage, and enhance transport for controlling the flow conditions. In this way, noninvasive and contactless analysis of biological cells with a 10 μm diameter was conducted using microwave technology. The in-liquid microwave simulation of fewer than 8 cells going to one cell is successfully performed. In the case of low cell concentration, the response of our biosensor is directly proportional to the number of cells present on the interdigitated capacitor (IDC). This feature enables the quantification of cells using microwave sensing techniques. The described bio-detection method is outlined, demonstrating the enhancements made to improve the accuracy and repeatability of simulations, leading to the achievement of adequate results. © 2024 IEEE.

关键词： Microfluidics

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Permanent tracebility of a Nanopositioning and Nanomeasuring Machine

Permanent tracebility of a Nanopositioning and Nanomeasuring...

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2023 ASPE Winter Topical Meeting: Precision Optical Metrology Workshop

作者： Manske, E. Blumröder, U. Köchert, P. Fröhlich, T. Kissinger, T. Ortlepp, I. Gerhardt, U. Mastylov, R. Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology Ilmenau Germany Precision Engineering Division Braunschweig Germany Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology Gustav-Kirchhoff-Str. 1 Ilmenau98693 Germany

ISBN: (纸本)9781713870876

Due to the frequency stabilization of He-Ne-lasers directly to a frequency comb controlled by a GPS atomic clock disciplined oscillator and their direct coupling with a Nanopositioning and Nanomeasuring Machine, directly traceable measurements are demonstrated. © (2023) by American Society for Precision Engineering (ASPE) All rights reserved.

关键词： Precision engineering

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Securing Data in Multimode Fibers by Exploiting Mode-Dependent Light Propagation Effects

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Research 2023年第3期2023卷 669-682页

作者： Stefan Rothe Karl-Ludwig Besser David Krause Robert Kuschmierz Nektarios Koukourakis Eduard Jorswieck Jürgen W.Czarske TU Dresden Faculty of Electrical and Computer EngineeringLaboratory of Measurement and Sensor System Technique01062 DresdenGermany TU Braunschweig Faculty of Electrical EngineeringInformation TechnologyPhysicsInstitute for Communications Technology38106 BraunschweigGermany TU Dresden Faculty of Physics01062 DresdenGermany

Multimode fibers hold great promise to advance data rates in optical communications but come with the challenge to compensate for modal crosstalk and mode-dependent losses,resulting in strong *** holographic measurement of the transmission matrix enables not only correcting distortions but also harnessing these effects for creating a confidential data connection between legitimate communication parties,Alice and *** feasibility of this physical-layer-security-based approach is demonstrated experimentally for the first time on a multimode fiber link to which the eavesdropper Eve is physically *** the proper structured light field is launched at Alice’s side,the message can be delivered to Bob,and,simultaneously,the decipherment for an illegitimate wiretapper Eve is *** a real communication scenario,we implement wiretap codes and demonstrate confidentiality by quantifying the level of *** to an uncoded data transmission,the amount of securely exchanged data is enhanced by a factor of *** complex light transportation phenomena that have long been considered limiting and have restricted the widespread use of multimode fiber are exploited for opening new perspectives on information security in spatial multiplexing communication systems.

关键词： distortion destroyed holographic

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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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Hybrid Multi-Layer Composites for Enhanced Dynamic-Static Force Sensing

Hybrid Multi-Layer Composites for Enhanced Dynamic-Static Fo...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Mohamed Dhia Ayadi Jawhar Aloulou Mingyang Yu Olfa Kanoun Chair for Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9798331542726

ISBN: (纸本)9798331542733

This study presents the piezoelectric and piezoresistive properties of a multilayer composite system consisting of PDMS-CNT and PDMS-BTO layers designed for dynamic and static sensing applications. The carbon nanotube (CNT) piezoresistive layer enhances the electrical conductivity and mechanical response of the composite, while the barium titanate (BTO) piezoelectric layer provides high dielectric performance and efficient voltage generation. This unique combination exploits the complementary properties of each layer to achieve a synergistic effect that surpasses traditional single-material systems. The 15% BTO-0.3% CNT configuration demonstrated optimal performance, delivering a voltage output of 2.1 V, a power density of 1.41 µW/m 3 , and a noticeable change in impedance under mechanical stress. The results highlight the dual sensing capabilities of the composite, its mechanical robustness and its potential for energy harvesting, pressure sensing and structural health monitoring. This work highlights the potential of CNT-BTO composites as a platform for advancing next-generation sensing and energy systems, balancing innovation with practicality in multifunctional material design.

关键词： Power system measurements Electric potential Voltage Nonhomogeneous media sensors Dielectrics Energy harvesting Impedance Piezoresistance Stress

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Highly Efficient IPT Transmitter Circuit Based on a Novel Enhanced Class B Amplifier for Consumer Applications

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IEEE Transactions on Consumer Electronics 2025年

作者： Adawy, Abdallah Bouattour, Ghada Ibbini, Mohammed Kanoun, Olfa Technische Universität Chemnitz Professorship Measurement and Sensor Technology Chemnitz Germany Leuphana University of Lüneburg Measurement and Sensor Technology in Production Engineering Lüneburg Germany Jordan University of Science and Technology Irbid Jordan

Designing an efficient Inductive Power Transfer (IPT) system involves significant challenges. On the transmitter side, it is essential to provide the transmitter coil with an alternating current (AC) operating within the kHz-MHz frequency range, which is generally generated by inverters linked to an intermediate direct current (DC) bus. While methods such as Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) can effectively minimize losses, they frequently lead to increased design complexity and voltage distortion. This paper introduces a compact and highly efficient transmitter circuit, with dimensions of 40 x 60 mm, utilizing an enhanced Class B AC-AC amplifier. This amplifier incorporates an operational amplifier with adjustable gain to deliver a trapezoidal waveform to the gates of the connected MOSFETs. The specific waveform effectively reduces crossover distortion and enhances the overall efficiency of the converter. Experimental results indicate that the efficiency of the proposed circuit surpasses 98%, which is suitable for powering small to medium load levels. © 1975-2011 IEEE.

关键词： Operational amplifiers

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CENTRE OF GRAVITY MEASURING DEVICE 24

CENTRE OF GRAVITY MEASURING DEVICE

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24th IMEKO TC3 Conference on measurement of Force, Mass and Torque 2022, Together with the 14th TC5 Conference on the measurement of Hardness, the 6th TC16 Conference on Pressure and Vacuum measurement, and the 5th TC22 Conference on Vibration measurement

作者： Pabst, M. Fröhlich, T. Technical University of Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Process Measurement Technology Group Ilmenau Germany

ISBN: (纸本)9781713870203

This paper describes a new method to measure the height of the centre of gravity of high-sensitive mass artefacts. A measuring device is presented and tested with mass samples of various shapes and densities. The results of the measurements are compared to the geometrical estimated heights of the centre of gravity and further developments of the new instrument are presented. © 2023 *** All Rights Reserved.

关键词： Comparators (optical)

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Double-pass modulated differential confocal microscopy for closed-loop axial control of direct laser writing 13

Double-pass modulated differential confocal microscopy for c...

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Optical measurement Systems for Industrial Inspection XIII 2023

作者： Belkner, Johannes Stauffenberg, Jaqueline Tenorio, Christian Görner Ortlepp, Ingo Manske, Eberhard Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology Max-Planck-Ring 12 Ilmenau98693 Germany

ISBN: (数字)9781510664463

ISBN: (纸本)9781510664456

Direct laser writing is a popular method for mask-less lithography that already achieved commercial grade. However, it is still challenging to realize homogeneously exposed structures on 3D-shaped substrates. A common source of the variation in exposure is a changing distance of the substrate surface with the photoresist towards the plane of the narrowest waist of the exposure beam. To tackle this issue, we propose a differential confocal probe that employs a spatially modulated pinhole. This phase-modulated lock-in principle enables highly resolved depth sensing without ambiguity about the direction of the deviation from the focal plane. However, the modulation contrast must be high enough to achieve this, which is why the measuring beam passes the pinhole twice. This probe is integrated into the nanopositioning and nanomeasuring machine via a position-based controller. We demonstrate the capability to follow 10◦ inclined substrates. © 2023 SPIE.

关键词： Confocal microscopy

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Long-term wavelength stabilisation of widely modulated lasers 13

Long-term wavelength stabilisation of widely modulated laser...

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Optical measurement Systems for Industrial Inspection XIII 2023

作者： Wiseman, Kieran B. Kissinger, Thomas Tatam, Ralph P. Centre for Engineering Photonics Cranfield University United Kingdom Institute of Process Measurement and Sensor Technology Technical University of Ilmenau Germany

ISBN: (数字)9781510664463

ISBN: (纸本)9781510664456

In this paper, we present a novel technique for stabilisation of widely wavelength modulated lasers (>100pm) over long time scales, where modulation depths exceed the spectral width of standard reference features, such as gas absorption lines, by over an order of magnitude. The technique operates by controlling the temporal separation between successive appearances of a gas absorption line on the up and down sweeps of a sinusoidal laser wavelength modulation waveform. The influence of the signal distortions introduced by the laser intensity modulation that are associated with laser diode injection current modulation are also addressed. The technique is applied to a range-resolved interferometric system interrogating a Mach-Zehnder interferometer operating in thermally stable conditions, using an absorption feature from a fibre-coupled gas cell as a reference. Proof-of-principle measurement results achieved using this technique are presented, demonstrating a notional fractional stability of 3.9×10−7 without further correction. © 2023 SPIE.

关键词： Stabilization

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