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

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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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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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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Microscale Electromagnetic Tracking Using a Second-Generation Quantum sensor 17

Microscale Electromagnetic Tracking Using a Second-Generatio...

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17th International Workshop on Impedance Spectroscopy, IWIS 2024

作者： Thuilot, Thomas Simoneit, Marc Brodmann, Jonas Schafer, Michael Hennig, Andreas Kanoun, Olfa Institute for Measurement Engineering and Sensor Technology Ruhr West University of Applied Sciences Mülheim a. d. Ruhr Germany Institute of Computer Science Ruhr West University of Applied Sciences Bottrop Germany Measurement and SensorTechnology Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9798331507626

This study demonstrates the application of second-generation quantum sensors in one-dimensional tracking. Due to their compact size, these magnetic field-sensitive sensors are particularly advantageous for medical and industrial settings where conventional sensors may be too large or vulnerable to electromagnetic interference. The proposed sensor setup achieves an average resolution of 1.22 mV/mm for tracking within a 100 mm range. The study also explores the nature and impact of various noise sources and discusses potential future techniques for mitigating these interferences. © 2024 IEEE.

关键词： Magnetometry

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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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Analytical Description of Transversally Symmetric Hinges with Semicircular Contours 16th

Analytical Description of Transversally Symmetric Hinges wi...

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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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Investigating the kinematic performance of a positioning device with subatomic resolution 23

Investigating the kinematic performance of a positioning dev...

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23rd International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2023

作者： Hebenstreit, Roman Oertel, Erik Thier, Daniel Manske, Eberhard Theska, René Technische Universität Ilmenau Department of Mechanical Engineering Institute for Design and Precision Engineering Precision Engineering Group Germany Technische Universität Ilmenau Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Germany

ISBN: (纸本)9781998999132

This paper is a follow-up to the conceptual design [1] and the prototype introduction [2] of a linear positioning device with subatomic resolution. This device is designed as a monolithic system. The linear guiding is realized by a mechanism with concentrated compliances. The position measurement is performed by tip-based scanning of the surface of a scale fixed at the moving table. Considering this setup, it becomes clear that the strongest sensitivity for kinematic deviations exists for displacements collinear to the probing axis of the tip as well as corresponding tilting motions. Deviations from an ideal straight guiding axis are mainly a result of manufacturing-related geometric deviations in the guiding mechanism. These error motions are investigated and characterised for prototype devices using an optical focus sensor in combination with a nanomeasuring machine NMM-1. To distinguish dynamic influences and static contributions to error motion, a quasi-static sequence of varying positions of the system has been performed during the measurement procedure. The determined error motions are highly reproducible due to the monolithic design from monocrystalline silicon. Consequently, the systematic error contribution of manufacturing deviations to the kinematic accuracy of the positioning device can be subsequently corrected. © 2023 Euspen Headquarters.

关键词： Compliant mechanisms

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Phase manipulating Fresnel lenses for wide-field quantitative phase imaging

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Optics Letters 2025年第8期50卷 2683-2686页

作者： Wang, Shengjia Dong, Bo Xiong, Jianxuan Liu, Lei Shan, Mingguang Koch, Alexander W. Gao, Shuai Key Laboratory of Photonic Materials and Device Physics for Oceanic Applications Ministry of Industry and Information Technology Harbin Engineering University Harbin150001 China Department of Physics Politecnico di Milano Piazza Leonardo Da Vinci 32 Milano20133 Italy College of Information and Communication Engineering Harbin Engineering University Harbin150001 China Institute for Measurement Systems and Sensor Technology Technical University of Munich Arcisstr. 21 Munich80333 Germany

For well-magnified imaging systems that satisfy the Nyquist criterion, camera pixels resolve the fine details provided by the objective lens. However, the mismatch in a space-bandwidth product (SBP) between the objective lenses and digital cameras leads to major sacrifices in the optical field of view (FOV). This Letter presents a framework of phase manipulating Fresnel lenses (PMFL) to bridge this SBP gap in quantitative phase imaging (QPI) modality. This framework breaks through the conventional design paradigm of interferometric QPI, converting it from the combination of individual optical elements to a direct phase transform of the optical field. The wide-field QPI is implemented by a single dynamic PMFL mask, which conducts differential interference and scans the opticalFOVacross the camera sensor. We built a microscopic platform equipped with the PMFL module to image both natural and artificial samples and expanded the FOV for a given camera by factors of 3×3, 2×2, and 4×1, respectively. © 2025 Optica Publishing Group.

关键词： Digital cameras

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Vulnerabilities and Challenges in the Development of PUF-Based Authentication Protocols on FPGAs: A Brief Review 7

Vulnerabilities and Challenges in the Development of PUF-Bas...

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7th IEEE Conference on Dependable and Secure Computing, DSC 2024

作者： Yavuz, Sinan Naroska, Edwin Daniel, Kai University of Siegen Department of Electrical Engineering and Computer Science Siegen Germany Niederrhein University of Applied Sciences Department of Electrical Engineering and Computer Science Krefeld Germany Institute of Measurement and Sensor Technology University of Applied Sciences Ruhr West Mülheim Germany

ISBN: (纸本)9798331540289

The security of IoT (Internet of Things) devices and the protection of sensitive information processed by these devices such as personal data, sensor values, process-related information is an important and difficult challenge. A major task in IoT communication is secure identification of devices. Unfortunately, traditional cryptographic methods are often not suitable for IoT devices due to their limited hardware resources. However, typical methods are computationally intensive, require a large amount of memory, and have a high-power consumption. On the other hand, Physical Unclonable Functions (PUFs) are low-cost and lightweight hardware-based primitives that can be used as a security component to protect data against third parties and thus increase security of a device. In this paper, the challenges and vulnerabilities in the development of PUF-based authentication protocols are presented. To this end, a security analysis of different approaches known from literature are discussed. Furthermore, possible attack vectors and prevention techniques are also considered. © 2024 IEEE.

关键词： Authentication Protocol

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Data Protection Regulation Compliant Dataset Generation for LiDAR-Based People Detection Using Neural Networks

Data Protection Regulation Compliant Dataset Generation for ...

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2024 IEEE International Conferences of AI, Science, engineering, and technology, AIxSET 2024

作者： Haas, Lukas Zedelmeier, Johann Bindges, Florian Kuba, Matthias Zeh, Thomas Jakobi, Martin Koch, Alexander W. Institute for Driver Assistance Systems and Connected Mobility Kempten University of Applied Sciences Germany Institute for Measurement Systems and Sensor Technology Technical University of Munich Germany Blickfeld GmbH Munich Germany Kempten University of Applied Sciences Faculty of Electrical Engineering Germany

ISBN: (纸本)9798350390995

The use of LiDAR sensor technology for people detection offers a significant advantage in terms of data pro-tection. In LiDAR point clouds, unlike camera images, people can be detected but not identified without further information. LiDAR sensors are, therefore, particularly suitable for detecting people in publicly accessible places and reacting accordingly to the number of people, for example, with on demand services at airports. Due to the anonymity of people in LiDAR point clouds, personal data is protected, and approval for implementing such a detection system is simpler than that of comparable camera systems. In this paper, we present a measurement setup that covers the configuration of the sensor setup, the creation of a dataset for training neural networks for object detection, and the object detection itself. The measurement setup generates an average of 2408 automatically labeled point clouds per sensor, per hour. The SECOND network trained with this dataset achieves average precision for the intersection over union of the 2D view with a threshold of 0.5 of 87.67 %, the PV-RCNN of 85.74 % and an average precision for the average orientation similarity with a threshold of 0.5 of 89.56 %, and for the PV-RCNN of 87.81 %. © 2024 IEEE.

关键词： Anonymity

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