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检索条件"机构=Fraunhofer-Institute for Applied Optics and Precision Engineering IOF"

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Silicon Photonic Biosensors for Label-Free Detection of Small Biomolecules 16

Silicon Photonic Biosensors for Label-Free Detection of Smal...

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16th Pacific Rim Conference on Lasers and Electro-optics, CLEO-PR 2024

作者： Costache, Florenta Wang, Ziyu Stoll, Andreas Smith, David Reichelt, Hendrik Kölsch, Andreas Lakshmireddy, Aarya Lu, Zhiqiu Fraunhofer Institute fur Photonic Microsystems IPMS Dresden Germany Fraunhofer Center Fze Erfurt Germany Fraunhofer Institute for Cell Therapy and Immunology IZI Leipzig Germany Fraunhofer Institute for Applied Optics and Precision Engineering Iof Jena Germany

A regenerable, multiplexed, and scalable photonic biosensor platform was developed to enable detection of small molecules such as miRNA biomarkers. Research involved design and fabrication of Si3N4 waveguide-based sen... 详细信息

ISBN: (纸本)9798350372076

关键词： Silicon photonics

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Analysis of the measurement accuracy of a thermal 3D sensor for transparent objects

Analysis of the measurement accuracy of a thermal 3D sensor ...

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作者： Speck, Henri Landmann, Martin Ramm, Roland Heist, Stefan Kühmstedt, Peter Notni, Gunther Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany Ilmenau University of Technology Department of Mechanical Engineering Ilmenau Germany

Transparent, translucent, jet-black, or reflective surfaces are non-cooperative for 3D measurements using pattern projection in the visible or near-infrared spectrum. They either require additional object preparation like spraying or cannot be measured at all. Previous studies have demonstrated that “shape from heating” is an appropriate technique to capture such non-cooperative surfaces. Patterns are projected with long-wave infrared radiation which is absorbed on the surface and generates a heat pattern. The re-emitted thermal radiation can be recorded in the mid-wave infrared by a stereo camera setup. In this contribution, we present the experimental implementation of a thermal 3D sensor based on sequential fringe projection. We performed a sensor characterisation in terms of measurement accuracy and speed following the VDI/VDE guideline 2634 part 2. Furthermore, we developed a test specimen which allows for comparing our thermal 3D sensor with alternative 3D measurement techniques. © 2024

关键词： 3D surface measurement Infrared cameras Non-cooperative objects Sensor characterisation Thermal sequential fringe projection Transparent objects

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Modulated Entangled Photon Source for Quantum Secret Sharing

Modulated Entangled Photon Source for Quantum Secret Sharing

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2023 Conference on Lasers and Electro-optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Ancsin, Philippe Ponce, Meritxell Cabrejo Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Emerging Technologies Department Albert-Einstein-Str. 7 Jena07745 Germany

ISBN: (纸本)9798350345995

Passive entangled photon sources, in which only one state is optimized for are suitable for two-party quantum key distribution (QKD). However, quantum based protocols that involve more participants require a more flexible photon source. In particular, quantum secret sharing (QSS) can be implemented using two-photon states only, whereby the source acts as an active participant [1]. © 2023 IEEE.

关键词： Quantum cryptography

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Improving and Benchmarking Photon-Number-Resolving Capabilities of Superconducting Nanowire Detectors

Improving and Benchmarking Photon-Number-Resolving Capabilit...

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Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Sauer, Gregor Kolarczik, Mirco Kohout, Oskar Gomez, Rodrigo Conrad, Johanna Steinlechner, Fabian Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena07745 Germany Swabian Instruments GmbH Stuttgart70435 Germany

We show how ultra-high-resolution timing measurements of the rising and falling edges of electrical pulses generated from conventional superconducting nanowire detectors enable to distinguish photon numbers of up to 9... 详细信息

ISBN: (纸本)9781557525185

关键词： Nanowires

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Wavelength-Selective Switch for Space-Division Multiplex Systems 24

Wavelength-Selective Switch for Space-Division Multiplex Sys...

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24. VDE ITG-Fachtagung Photonische Netze - 24th VDE ITG Symposium on Photonic Networks

作者： Rapp, Lutz Spinty, Florian Abélard, Clément Trautmann, Steffen Engel, Philip Kilian, Sarah Olaya, Jean-Christophe Kirchner, David Eiselt, Michael ADVA Optical Networking SE Meiningen Germany HOLOEYE Photonics AG Berlin Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

ISBN: (纸本)9783800760787

—The development of a wavelength selective switch (WSS) for space-division multiplexing (SDM) applications is discussed, covering system aspects and applicability of an SDM-WSS in an optical network as well as the development of the free-space optics and of the Liquid-Crystal-on-Silicon (LCoS) Spatial Light Modulator (SLM), including the flexible driving solution. © VDE Verlag GmbH.

关键词： Light modulators

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One-way clock synchronization with single photons

One-way clock synchronization with single photons

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CLEO: Applications and Technology, A and T 2022

作者： Spiess, Christopher Töpfer, Sebastian Rieländer, Daniel Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany

Quantum communication systems can be synchronized using data patterns, precise oscillators, or pulsed lasers. We demonstrate an alternative approach that uses time-bin quanta as a reference for synchronizing low-cost ... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781957171050

关键词： Synchronization

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Transverse Mode Instabilities in kW-class Tm-doped Fiber Amplifier

Transverse Mode Instabilities in kW-class Tm-doped Fiber Amp...

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Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Friedrich Möller Tilman Lühder Benjamin Yildiz Christian Schmittner Till Walbaum Thomas Schreiber Fraunhofer Institute for Applied Optics and Precision Engineering IOF Germany

ISBN: (纸本)9798350345995

Transverse Mode Instabilities (TMI) are a thermally-induced nonlinear effect that results in a fluctuating output beam profile unsuited for most applications. Since their first observation in Yb-doped amplifiers [1], TMI have manifested as major limitation in scaling the average output power of high-power fiber lasers. In 2021, TMI have been observed in Tm-doped fiber amplifiers as well [2], [3]. Recently, Anderson et al. presented 1.1 kW at 1950 nm [3] and 905 W at 2040 nm [4] in Tm-doped fiber amplifiers in 20/400μm geometry, both pumped with diode lasers of a wavelength around 794 nm. Their experiments with 25/400μm Tm-doped fibers were TMI-limited around 600 – 700 W [4] and dependencies on the active fiber length were investigated [4]. In our contribution we will present the dependence of the TMI-threshold on the pump wavelength, as has been done for Yb amplifiers [5]. Furthermore, we will show that Tm-doped fiber amplifiers in 25/400μm geometry can be scaled TMI-free beyond 700 W.

关键词： Diode pumped lasers High power fiber lasers Instabilities Modes Nonlinear effects Thulium-doped fiber amplifiers

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Multimodal RGB-D-T-scanning for interactive robot teaching 5

Multimodal RGB-D-T-scanning for interactive robot teaching

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Automated Visual Inspection and Machine Vision V 2023

作者： Zhang, Yan Notni, Gunther Group for Quality Assurance and Industrial Image Processing Technische Universität Ilmenau Ilmenau Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Jena Germany

ISBN: (数字)9781510664562

ISBN: (纸本)9781510664555

In this paper, we introduce an interactive multimodal vision-based robot teaching method. Here, a multimodal 3D image (color (RGB), thermal (T) and point cloud (3D)) was used to capture the temperature, texture and geometry information required to analyze human action. By our method, we only need to move our finger on an object surface, and then the heat traces left by the finger on the object surface will be recorded by the multimodal 3D sensor. By analyzing the multimodal point cloud dynamically, the accurate finger trace on the object is recognized. A robot trajectory is computed using this finger trace. © 2023 SPIE.

关键词： Textures

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A review of different multispectral indices for monitoring plant health in mid-mountain sites 10

A review of different multispectral indices for monitoring p...

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Image Sensing Technologies: Materials, Devices, Systems, and Applications X 2023

作者： Richter, Martin Rosenberger, Maik Meister, Janek Illmann, Raik Notni, Gunther Technische Universität Ilmenau Department of Mechanical Engineering Group for Quality Assurance and Industrial Image Processing Ilmenau Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

ISBN: (数字)9781510661431

ISBN: (纸本)9781510661424

The effects of climate change, such as drought and pest infestation, will pose new challenges for forest management in the coming years to ensure the preservation of biodiversity and vegetation balance. A combination of various sensor technologies enables early detection of changes and initiation of necessary mitigation steps. Here, hyperspectral cameras provide direct measurement of the health status on the plants themselves. The achievable spatial and spectral resolutions have been steadily increasing due to the use of drones instead of airplanes and satellites. Nevertheless, only canopy measurement is possible in this case. The measurement below the tree canopy can grant new insights and increase the resolution up to the level of the leaf. The aim of this work is to define the basic requirements for a spectral system suitable for this purpose. For these high-resolution spectral images of typical plants of the mid-mountain range during desiccation were acquired. On the basis of these, various vegetation indices were calculated and the influence of filter properties such as the half-width were simulated. During this investigation, a clear reaction to desiccation was observed in all samples after a brief period of time. Different vegetation indices show a comparable behavior despite the application of different wavelengths. © 2023 SPIE.

关键词： Forestry

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3D geometric features based real-time American sign language recognition using PointNet and MLP with MediaPipe hand skeleton detection

3D geometric features based real-time American sign language...

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This paper presents a robust and fast hand gesture recognition method. Utilizing the 21 hand key points predicted by MediaPipe developed by Google, we calculate additional 3D geometric features, including the angles of each finger joint. These geometric features are then subjected to deeper feature extraction using a Multilayer Perceptron (MLP). Simultaneously, these hand key points are normalized in 3D spatial space, and the finger and palm regions are interpolated to generate a point cloud representing the hand skeleton. Subsequently, PointNet is employed for feature extraction from this point cloud. The features extracted by MLP and PointNet are fused, and a classifier is employed to output the probability distribution of hand gestures for each frame of a 3D video stream. Furthermore, a probability machine is designed to analyze the probability sequence, providing the overall gesture prediction. In the experimental phase, we trained a model to classify American Sign Language (English letters and numbers 0 to 9). The results demonstrate an overall accuracy of 99.81 %. The entire method operates in less than 10 milliseconds (using an NVIDIA 2080Ti graphics card), showcasing its real-time detection capabilities. © 2024

关键词： ASL recognition Hand gesture Human recognition Human robot interaction Multimodal imaging Point cloud processing

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