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27th International Conference on Optical Fiber sensors, OFS 2022

作者： Unterkofler, Johanna Glanz, Gregor Koller, Markus Klambauer, Reinhard Bergmann, Alexander Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33/I Graz8010 Austria Center for Low-Emission Transport AIT Austrian Institute of Technology GmbH Giefinggasse 2 Vienna1210 Austria

We study a fiber Bragg grating (FBG) sensor array inside lithium-ion pouch cells to measure the temperature. A comparison of the sensor response before and after embedding in a cell is performed. Several adverse effec... 详细信息

ISBN: (纸本)9781957171142

关键词： Fiber Bragg gratings

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Lattice vibrations and energy landscape of the isoelectronic semiconductor series CuBr, ZnSe, GaAs, and Ge: The special case of CuBr and its d-level chemistry

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Physical Review B 2023年第19期108卷 195202-195202页

作者： Joseph C. Woicik Eric Cockayne Eric L. Shirley Igor Levin Conan Weiland Bruce Ravel A. M. Milinda Abeykoon Materials Measurement Science Division Material Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Sensor Science Division Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland 20899 USA National Synchrotron Light Source II Brookhaven National Laboratory Upton New York 11973 USA

We have examined the lattice vibrations and the energy landscape of the isoelectronic diamond and zincblende semiconductor series CuBr, ZnSe, GaAs, and Ge. Vibrations are found to be an increasing function of ionicity, with the cation sublattice always vibrating more strongly than the anion sublattice. These findings are consistent with density functional theory (DFT) calculations of the energy landscape and temperature-dependent molecular dynamics simulations of the atomic-position fluctuations. For CuBr, inclusion of the Cu 3d Hubbard U term is found necessary to stabilize the zincblende structure and to bring its vibrational amplitudes into agreement with experiment. In addition, vibrations are found to strongly affect the CuBr near-edge x-ray absorption fine structure that we have successfully modeled by including displacements in our theoretical Bethe-Salpeter equation calculations. Reverse Monte Carlo structural refinements using large atomic configurations to simultaneously fit x-ray absorption and x-ray total-scattering data support these conclusions, and they reveal strong Cu-Br first-neighbor correlations and asymmetric distributions of interatomic distances in the temperature ranges of both negative and positive thermal expansion. Delineation of the CuBr valence band photoelectron spectrum into its Cu 3d and Br 4p states uniquely reveals their covalent mixing and further supports the DFT results.

关键词： Lattice dynamics Semiconductors First-principles calculations X-ray absorption spectroscopy

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Dynamic force generation capabilities in the PB2 Planck-Balance

Dynamic force generation capabilities in the PB2 Planck-Bala...

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Conference on Precision Electromagnetic measurements (CPEM)

作者： Norbert Rogge Marco-Tulio Perez-Sulbaran Suren Vasilyan Christian Rothleitner Yin Hsien Fung Georg Hein Thomas Fröhlich Institute of Process Measurement and Sensor Technology TU Ilmenau Ilmenau Germany Physikalisch-Technische Bundesanstalt (PTB) Braunschweig Germany Measurement Standards Laboratory of New Zealand Lower Hutt New Zealand

This contribution presents the generation of dynamic force in a table top Kibble balance. The inertial force of a mass standard that is moved in an oscillatory motion is determined in a dynamic force mode and serves a... 详细信息

ISBN: (数字)9798350361049

ISBN: (纸本)9798350361056

关键词： Coils Actuators Uncertainty Force measurement Electromagnetic measurements Force Dynamics

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Flexsensor: Automated measurement Software for Rapid Photonic Circuits Capturing

SSRN

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SSRN 2024年

作者： Schmidt, Christoph Hinum-Wagner, Jakob Wilhelm Klambauer, Reinhard Bergmann, Alexander Graz University of Technology Institute of Electrical Measurement and Sensor Systems Graz Austria ams-OSRAM AG Tobelbaderstraße 30 Premstaetten Austria

This paper introduces the automation measurement software Flexsensor for capturing resonant spectra, an innovative and extensible software program developed explicitly for measuring and evaluating Silicon Photonic (SiPh) circuits. Wafer-level Wafer-level Silicon Photonics allows the integration of numerous optical components and structures on a single wafer. However, researchers and engineers need precise and repeatable measurements to characterize them and face significant challenges when dealing with large numbers of complex systems on a single wafer. A toolchain gap hampers the measuring of such highly integrated photonic structures: While the setup necessitates the integration of an optimized hardware and software toolchain, there is neither software nor a standardized way to implement a reproducible measurement routine for a massive set of measurements. Flexsensor allows integration and control of external hardware (tunable lasers, analog-digital converters) and supports measurement data storage and evaluation. The software enables researchers and engineers to efficiently analyze the spectral response of photonic structures and facilitate rapid measuring. © 2024, The Authors. All rights reserved.

关键词： Silicon photonics

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Secret Key Generation in Multi-Mode Fiber Channels: Channel measurements and Achievable Rates

Secret Key Generation in Multi-Mode Fiber Channels: Channel ...

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IEEE International Conference on Communications (ICC)

作者： Pin-Hsun Lin Paul Nowitzki Eduard A. Jorswieck Dennis Pohle Juergen Czarske Institute for Communications Technology Technische Universität Braunschweig Germany Laboratory of Measurement and Sensor System Technique Technische Universität Dresden Germany

ISBN: (数字)9781728190549

ISBN: (纸本)9781728190556

Secret keys play a critical role in secure data transmission, and an efficient secret key generation scheme will enhance the secure transmission rate. However, the secret key is a scarce resource for classical encryption schemes like the Rivest-Shamir-Adleman (RSA) cryptosystem and its counterpart in quantum applications, and we should extract it from all possible random sources to maximize the key rate. In this paper, we investigate the achievable rate of the secret key generation (SKG)-channel-model based on an actual measured multi-mode fiber (MMF) channel, where there is an additional public discussion channel between the legitimate parties, which the adversary can perfectly overhear. In particular, we measure the fiber transmission matrix by digital holography. Based on the real measurements, we show that for 55-mode MMF, we can achieve a positive secret key rate at 51.3 bit/channel use with mode-dependent loss (MDL) at 1 dB and transmit power at 20 dBm. This demonstrates the feasibility of SKG in MMF.

关键词： Power measurement Atmospheric measurements Power transmission Holography Particle measurements Propagation losses Optical fiber communication

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PORTABLE ELECTROCHEMICAL sensor BASED ON MOLECULARLY IMPRINTED POLYMER FOR OXYTETRACYCLINE DETECTION 10

PORTABLE ELECTROCHEMICAL SENSOR BASED ON MOLECULARLY IMPRINT...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Tang, Yuxin Hu, Jingfang Wang, Linzhe Wei, Wensong Song, Yu Li, Yansheng Gao, Guowei Beijing key Laboratory of sensor Beijing Information Science & Technology University Beijing100101 China Key Laboratory of Agricultural Product Processing Ministry of Agriculture Institute of Food Science and Technology Chinese Academy of Agricultural Sciences Beijing100193 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science & Technology Unive rsity Beijing100192 China Zibo Institute for Digital Agriculture and Rural Research Zibo255051 China

ISBN: (纸本)9781837242672

Reduced graphene oxide (rGO) plays a critical role in enhancing the performance of electrochemical sensors through its excellent electrical conductivity, large surface area, ease of functionalization, chemical stability, and synergy with other nanomaterials. In this paper, A novel electrochemical sensor was developed based on rGO and molecularly imprinted polymer (MIP) for detection of trace oxytetracycline (OTC) in water. The MIP/rGO composites are synthesized by in-situ electrochemical modification on a disposable screen-printed electrode (SPE). Due to the large surface area and good electron transport rate of rGO, as well as the specific recognition for TC of MIP, the sensitive determination of trace TC at MIP/rGO/SPE was realized. Linear sweep voltammetry (LSV) was performed on the sensor for the electrochemical analysis of OTC. Under optimized conditions, the peak current of MIP/rGO/SPE exhibited a good linear correlation with OTC concentration in a wide linear range (1-25 (j,mol/L), possessed a detection limit of 0.34 (j,mol/L. Spiked detection of OTC was applied for the sensor in actual water samples, with relative standard deviations (RSDs) of 93.2%-108.7%. These results indicate that the proposed MIP/rGO/SPE sensor has the ability to accurately, rapidly and selectively detect OTC in water samples. © The Institution of Engineering & technology 2024.

关键词： Reduced Graphene Oxide

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Thermal fluids field reconstruction with Bayesian inference for forced convection system 13

Thermal fluids field reconstruction with Bayesian inference ...

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13th Nuclear Plant Instrumentation, Control and Human-Machine Interface Technologies, NPIC and HMIT 2023

作者： Kim, Haeseong Cetiner, Sacit Bucci, Matteo Nuclear Science and Technology Department Massachusetts Institute of Technology CambridgeMA United States INL MIT Center for Reactor Instrumentation Cambridge and Sensor MAPhysics MIT Nuclear Reactor Laboratory United States Measurement Sciences Laboratory Idaho National Laboratory Idaho FallID United States

ISBN: (纸本)9780894487910

In many nuclear applications, there is a need to extract as much information as possible within the constraints of instrumenting a process, structure, component, or system. We applied Bayesian inference to reconstruct variables of interest in thermal-fluid problems: distribution of heat flux boundary condition from the limited number of point-wise temperature measurements at the wall in a forced convection problem. We show that it is possible to efficiently reconstruct a steady-state heat flux boundary using a physics-based mapping with an appropriate prior distribution of the boundary condition. The inferencing problem includes the source of uncertainty: noisy temperature measurement and inadequately characterized physics model (wall function and turbulent diffusivity) while using the Reynolds-averaged Navier-Stokes (RANS) turbulence model. We compared the result against flow experiments on single-phase turbulent flow in a rectangular channel visualized with infrared thermometry. The advanced high-resolution diagnostic provides temperature distribution and heat flux profile at the heat transfer interface. The measurements are used to validate the proposed reconstruction methodology. When put in suitable locations, the reconstruction gives reasonable accuracy with a small number of sensors. The established Bayesian inference method will be applied to more extensive flow conditions in the near future to understand its usefulness and applicability. The method presented here can potentially support the advancement of nuclear digital twin technology, where we expect new modes of operation and decision-making processes with less human intervention, remote monitoring, and, ultimately, autonomous operation. © 2023 American Nuclear Society, Incorporated.

关键词： Temperature measurement

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Compact Inverse-Designed Metalens for Millimeter-Wave Field Enhancement

Compact Inverse-Designed Metalens for Millimeter-Wave Field ...

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2024 IEEE Photonics Conference, IPC 2024

作者： Schmidt, Christoph Töfferl, Michael Schossmann, Alexander Banzer, Peter Bergmann, Alexander Graz University of Technology Institute for Measurement and Sensor Systems Inffeldgasse 33/I Graz8010 Austria Christian Doppler Laboratory for Structured Matter Based Sensing Inffeldgasse 33 and Universitätsplatz 5 Graz8010 Austria University of Graz Department of Physics Universitätsplatz 5 Graz8010 Austria

ISBN: (纸本)9798350361957

Enhancing fields is an important task in millimeter-wave applications, such as nondestructive microwave inspection, metamaterial sensing applications, or millimeter-wave imaging. This demand for compact yet high-performance devices for field enhancement operating in the millimeter-wave regime has led to innovative approaches regarding lens design. State-of-the-art lens designs in this wavelength regime tend to be bulky and operate in the far field, making them unsuitable for small form factor applications. In this context, formulating the required functionality and algorithmically looking for the desired material topology is an inversion of the standard approach. This paper presents an inverse-designed field-amplifying metalens operating in the near field of a 60GHz patch antenna. With a size of about three times the wave length, the given structure promises good performance while maintaining a smaller form factor than conventional solutions. It yields an enhancement of the power amplitude by over 7dB. © 2024 IEEE.

关键词： Inverse problems

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Ab-initio modeling of bend-losses in silicon nitride waveguides from visible to near-infrared 13

Ab-initio modeling of bend-losses in silicon nitride wavegui...

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Optical Modeling and Performance Predictions XIII 2023

作者： Hinum-Wagner, Jakob W. Hoermann, Samuel M. Sattelkow, Jürgen Buchberger, Anton Schörner, Christian Janka, Stephan Rossbach, Georg Rist, Desiree Kraft, Jochen Bergmann, Alexander Institute of Electrical Measurement and Sensor Systems Graz University of Technology Inffeldgasse 33 Graz8010 Austria ams-OSRAM AG Tobelbaderstraße 30 Premstaetten8141 Austria ams-OSRAM International GmbH Leibnitzstraße 4 Regensburg93055 Germany

ISBN: (纸本)9781510665422

Integrated photonics features applications in high-speed telecommunication, computing, and sensing. These devices are ultimately limited by the optical loss occurring in the waveguide structures. One of its primary sources is surface-roughness- induced scattering and bend-losses. Surface roughness is unavoidably introduced during deposition, mainly during etching and lithographic steps. In photonic integrated circuits, tight bends enable a compact footprint yet increase the mode mismatch loss, radiation loss and scattering loss. Previously, the bend losses were estimated from a parametric model. However, it lacks flexibility w.r.t. the waveguide platform. We apply a recently developed model of the surface-roughness-induced scattering in guided-mode systems to substantiate the dependence of the scattering loss on the bend-radius for waveguides based on a silicon nitride platform. The model incorporates the surface roughness via its autocorrelation. Further, it inherently considers the overlap of the modes with the roughness. As waveguide material, we used both plasma-enhanced CVD silicon nitride as a low-temperature, back-end-compatible process, and low-pressure CVD silicon nitride, as a high-temperature frontend process. As bottom and top cladding, we deposited high-density plasma (HDP) and sputtered silicon oxide, respectively. The latter offers flexibility to adapt the platform for sensing purposes. We evaluate different waveguide widths, bend radii, and wavelengths in the visible and near-infrared ranges. We set the observed propagation losses into context with estimated absorption, scattering, and mode-overlap loss sources and point to their shifting importance at the measured wavelengths. We believe that this model allows to increase our knowledge about the various aspects of loss in guided mode systems and predict the propagation loss based on foregoing absorption and roughness measurements. © 2023 SPIE.

关键词： Surface roughness

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Wearable Ballistocardiography for Unobtrusive Respiratory and Heart Rate Monitoring

Wearable Ballistocardiography for Unobtrusive Respiratory an...

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IEEE sensorS

作者： Bastian Latsch Alexander A. Altmann Omar Ben Dali Romol Chadda Niklas Schäfer Kilian Schäfer Muhammad Bilal Khan Jan Helge Dörsam Felix Herbst Sven Suppelt Oliver Gutfleisch Mario Kupnik Measurement and Sensor Technology Group Technische Universität Darmstadt Germany Functional Materials Institute of Materials Science Technische Universität Darmstadt Germany

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

Respiratory and heart rate are accessible physiological signatures of human vitality. Unobtrusive insole ballistocardiography using highly sensitive piezoelectric sensors promises a wearable measurement system to monitor health throughout the day. In this work, the 3D-printed ferroelectret insole is worn by three participants while standing in upright posture. The beat-to-beat detection implements a continuous wavelet transform to filter the main frequency bands (6 to 8 Hz) in the time-frequency domain, offering accurate heartbeat timings. Amplitude and frequency variabilities in the heartbeat signal are evaluated separately to reveal the underlying respiration. Both instantaneous characteristics can be fused to obtain a robust breath-to-breath measurement, mitigating body movements and non-respiratory arrhythmia. The measured heart rate aligns well with the reference from a commercial chest strap, and the heart rate variability with ± 4 beats per minute is consistent with the literature values of respiratory sinus arrhythmia. In conclusion, the wearable insole concept with the presented signal processing chain qualifies for remote health monitoring.

关键词： Weight measurement Time-frequency analysis Accuracy Wavelet domain Arrhythmia Signal processing Biomedical monitoring Heart rate variability Monitoring Wearable sensors

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