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

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Evaluation of Internal and External Starch Changes in Apples Using Hyper-Spectral Analyses in the NIR-SWIR

Evaluation of Internal and External Starch Changes in Apples...

引用

Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS

作者： A. K. Ruvalcaba Perez G. Siess N. Janunts V. Boehm A. Tuennermann Abbe Center of Photonics Institute of Applied Physics Friedrich Schiller University Jena German ams OSRAM Group Jena Germany Institute of Nutritional Sciences Friedrich Schiller University Jena Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

ISBN: (数字)9798331513139

ISBN: (纸本)9798331513146

Starch Pattern Index (SPI) is one of the most common parameters used to determine the degree of ripeness of fruits. To predict the degree of ripeness, SPI is combined with chemometric analysis. Nevertheless, the spectral correlation between external and internal starch changes has not been evaluated. This study evaluates the internal and external changes of starch in Gala apples during the 2024 season by covering the near-infrared (NIR) and short-wave infrared (SWIR) spectral ranges from 700nm to 2300nm. The evaluation consisted of a multispectral NIR-SWIR camera analysis and spectral measurements along the surface. Results revealed a pattern on the apple cortex similar to SPI without the use of iodine implementation of a false negative RGB image. Furthermore, the different SPIs were also distinguished by the spectral measurements along the surface, allowing a correlation in both instances with the same phenomenon.

关键词： Correlation Surface waves Conferences Signal processing Cameras Indexes Surface treatment Remote sensing Iodine Hyperspectral imaging

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Tuneable Spatially Entangled Photon-Pair Emission from a Nonlinear Metasurface

Tuneable Spatially Entangled Photon-Pair Emission from a Non...

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

作者： Weissflog, Maximilian A. Ma, Jinyong Zhang, Jihua Saravi, Sina Pertsch, Thomas Neshev, Dragomir N. Setzpfandt, Frank Sukhorukov, Andrey A. Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Jena07745 Germany Department of Electronic Materials Engineering Research School of Physics The Australian National University CanberraACT2601 Australia Fraunhofer Institute for Applied Optics and Precision Engineering Jena07745 Germany

ISBN: (纸本)9798350345995

Entangled photon-pairs generated through spontaneous parametric down-conversion (SPDC) have evolved into an indispensable resource for various quantum communication, imaging, sensing and computing schemes. While photon-pair sources are so far mostly based on bulk-optical nonlinear components, resonant nonlinear metasurfaces with sub-wavelength thickness have recently been demonstrated as a new platform for photon-pair generation [1-3]. Contrary to bulk and integrated nonlinear structures where phase matching steers the pair generation efficiency in different directions and wavelengths, nanostructures can control these properties via their optical resonances. However, the tunability of spatial photon emission in multiple directions remained an open challenge. © 2023 IEEE.

关键词： Phase matching

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Oxygen saturation estimation from near-infrared multispectral video data using 3D convolutional residual networks 3

Oxygen saturation estimation from near-infrared multispectra...

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Multimodal Sensing and Artificial Intelligence: Technologies and Applications III 2023

作者： Liao, Wang Zhang, Chen Sun, Xinyu Notni, Gunther Technische Universität Ilmenau Gustav-Kirchhoff-Platz 2 IlmenauD-98693 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 JenaD-07743 Germany

ISBN: (纸本)9781510664517

Non-contact methods can expand the application scenarios of blood oxygen measurement with better hygiene and comfort, but the traditional non-contact methods are usually less accurate. In this study a novel noncontact approach for measuring peripheral oxygen saturation (SpO2) using deep learning and near-infrared multispectral videos is proposed. After a series of data processing including shading correction, global detrending and spectral channel normalization to reduce the influences from illumination non-uniformity, ambient light, and skin tone, the preprocessed video data are split into half-second clips (30 frames) as input of the 3D convolutional residual network. In the experiment, multispectral videos in 25 channels of hand palms from 7 participants were captured. The experimental results show that the proposed approach can accurately estimate SpO2 from near-infrared multispectral videos, which demonstrates the agreement with commercial pulse oximeter. The study also evaluated the performance of the approach with different combinations of near-infrared channels. © 2023 SPIE.

关键词： Convolution

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High-performance EUV Ptychography at 13.5 nm

High-performance EUV Ptychography at 13.5 nm

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2023 Computational Optical Sensing and Imaging, COSI 2023 in Optica Imaging Congress - Part of Imaging and applied optics Congress 2023

作者： Eschen, W. Liu, C. Penagos Molina, D.S. Klas, R. Limpert, J. Rothhardt, J. Helmholtz Institute Jena Fröbelstieg 3 Jena07743 Germany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 1 Darmstadt64291 Germany Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-University Jena Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany

We present table-top high-speed EUV ptychography at 13.5 nm. Employing a novel sCMOS detector enables 5x faster wide-field imaging with an imaging speed of 4.6 Mpix/h. Further, Hertz-scale high-resolution EUV wavefron... 详细信息

ISBN: (纸本)9781957171289

关键词： Biomedical imaging Complementary metal oxide semiconductors High harmonic generation Ptychography Refractive index Wave front sensing

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Spontaneous Parametric Down-Conversion in Transition Metal Dichalcogenides

Spontaneous Parametric Down-Conversion in Transition Metal D...

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

作者： Weissflog, Maximilian A. Fedotova, Anna Tang, Yilin Laudert, Benjamin Abtahi, Fatemeh Shradha, Sai Shinde, Saniya Saravi, Sina Staude, Isabelle Pertsch, Thomas Setzpfandt, Frank Lu, Yuerui Eilenberger, Falk Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Jena07745 Germany Institute of Solid State Physics Friedrich Schiller University Jena Jena07743 Germany School of Engineering College of Science and Computer Science The Australian National University CanberraACT2601 Australia Institute for Condensed Matter Physics Technical University of Darmstadt Darmstadt64289 Germany Fraunhofer-Institute for Applied Optics and Precision Engineering IOF Jena07745 Germany

ISBN: (纸本)9798350345995

Transition metal dichalcogenides (TMDCs) thinned-down to the monolayer level allow the realisation of very broad-band, phase-matching free nonlinear devices. A particularly interesting application would be the generation of entangled photon-pairs, which form the backbone of many recent implementations in quantum optics. However, the limited absolute efficiency of monolayers has so far only allowed seeded parametric amplification [1], experimental evidence for the generation of entangled photon-pairs through spontaneous parametric down-conversion (SPDC) remained elusive up to now [2]. A promising route for the realization of broad-band photon-pair sources in van der Waals materials are moderately thicker, yet still phase-matching free layer stacks with preserved noncentrosymmetry [3, 4]. Here, we close the gap of a missing entangled photon-pair source in TMDCs and demonstrate, for the first time to our knowledge, pair generation via SPDC in 3R-MoS2 © 2023 IEEE.

关键词： Transition metals

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Experimental Demonstration of High-Dimensional Hyperentagled Quantum States

Experimental Demonstration of High-Dimensional Hyperentagled...

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

作者： Gonzalez-Martin del Campo, Luis J. Tangarife, Nicolás Sharma, Sakshi Spiess, Christopher Sondenheimer, René Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Strasse 7 Jena07745 Germany Friedrich Schiller University Jena Abbe Center of Photonics Albert-Einstein-Strasse 6 Jena07745 Germany

ISBN: (纸本)9798350345995

In this work we demonstrate experimentally the realization and characterization of high-dimensional hyperentangled quantum states of light in the time-energy and polarization degree of freedom. For this goal we use an ultra-bright Sagnac-type source to generate entangled photon in the telecommunication band by means of spontaneous parametric down-conversion (SPDC). To project the time-energy entanglement to a 4-dimensional space we implemented a 4-arm interferometer, consisting of a cascade array of 2-arm unbalanced Mach-Zehnder interferometers (UMZI). For the case of the projection of the entangled quantum states in the polarization degree of freedom (DoF) a compact, stable and robust polarization analysis module (PAM) was implemented to project polarization correlations in two non-orthogonal basis. © 2023 IEEE.

关键词： Interferometers

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Surface second harmonic generation from AB-type stacks of dielectric nanolaminates

Surface second harmonic generation from AB-type stacks of di...

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

作者： Abtahi, Fatemeh Paul, Pallabi Kuppadakkath, Athira Pakhomov, Anton Szeghalmi, Adriana Setzpfandt, Frank Eilenberger, Falk Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Str. 15 Jena07745 Germany Franhofer-Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Straße7 Jena07745 Germany Max Plank School of Photonics Jena Germany

ISBN: (纸本)9798350345995

Surface Second Harmonic Generation (SHG) is a second order nonlinear process that can only be observed in materials with broken inversion symmetry. However, due to the discontinuity of the medium and the large electric field gradient at a surfaces, the inversion is broken and SHG can be generated there, too [1]. *** and et al [2] theoretically studied the surface SHG from ultrathin stacks of TiO2/SiO2. There many surfaces contribute to SHG in a subwavelength arrangement. They have predicted SHG enhancement from superimposing the signals from each surfaces with transfer matrix method. © 2023 IEEE.

关键词： Harmonic generation

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Alignment of Multi-Camera Spectral Images Using Wavelet Transform

Alignment of Multi-Camera Spectral Images Using Wavelet Tran...

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IEEE Instrumentation and Measurement Technology Conference

作者： Martin Richter Raik Illmann Maik Rosenberger Gunther Notni Department of Mechanical Engineering Technische Universität Ilmenau Germany Fraunhofer Institute for Applied Optics and Precision Engineering Jena Jena Germany

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

Multispectral imaging is a valuable tool for monitoring plant health in agriculture and forestry. These methods are based on the calculation of different vegetation indices consisting of at least two spectral channels. In order to obtain accurate results, these two images must perfectly overlap. For cost-effective multispectral monitoring of plants with several single-channel cameras, we propose an image alignment technique that utilizes the structure of the scene itself and edge detection by means of wavelet transform. By transforming the spectral images into the frequency domain, we can calculate the average displacements of the scene by determining the distance between the peak amplitudes of the two spectral channels for each image line and axis. Originally, we used the haar wavelet function to extract the frequency domain, which yielded initial good results for vegetation and structures. Other wavelet functions were tested, which allowed further improvements. However, compared to edge extraction with the non-wavelet Sobel operator, only the rbio3.1 wavelet showed improved capabilities in merging the spectral channels, requiring on average one iteration of the proposed algorithm, while maintaining the success rate of Sobel.

关键词： Wavelet transforms Wavelet domain Frequency-domain analysis Image edge detection Plants (biology) Vegetation mapping Solids

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Tailored Apodization of Femtosecond Written Fiber Bragg Gratings by Aperture Shaping

Tailored Apodization of Femtosecond Written Fiber Bragg Grat...

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Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, BGPP 2022

作者： Krämer, Ria G. Schmittner, Christian P. Goebel, Thorsten A. Siems, Malte P. Ullsperger, Tobias Imogore, Timothy O. Richter, Daniel Nolte, Stefan Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Str. 15 JenaD-07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Str. 7 JenaD-07745 Germany

We present the realization of tailored apodization profiles of femtosecond written FBGs using phase mask scanning technique with aperture shaping. By controlling the cross-sectional dimension of the refractive index m... 详细信息

ISBN: (纸本)9781957171166

关键词： Fiber Bragg gratings

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A lightweight investigation on automated visual SMD-PCB inspection based on multimodal one-class novelty detection

A lightweight investigation on automated visual SMD-PCB insp...

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作者： Liu, Zheng Notni, Gunther Technische Universität Ilmenau Gustav-Kirchhoff-Platz 2 Ilmenau D-98693 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 Jena D-07743 Germany

In recent years, with the research and development of deep learning, it has been more widely used in various fields, becoming an important productivity tool. In electronic manufacturing, an adaptive automatic optical inspection (AOI) system is proposed for defect detection of printed circuit board components (SMD-PCB), a key part of the industry chain. It is a combination of AOI based on traditional computer vision and multimodal imaging and PatchCore, a one-class novelty detection method based on deep learning. It aims to utilize one-class novelty detection method to detect and avoid defect missing due to different and variable objects and defects that require a lot of manpower to eliminate in normal AOI. Due to the unique characteristics of industrial applications, it is important to ensure inspection quality while controlling hardware and time costs. Therefore, in this adaptive AOI system, the reduction of time and hardware consumption of deep learning-based PatchCore during the training and inference process becomes an important part of putting it into practical application. In this work, we investigate the lightweighting of the PatchCore method, whose core idea is to use deep convolutional neural networks (CNN) for feature extraction to construct a feature memory bank, and then retrieve the feature memory bank to determine the novelty of the samples to be tested. According to this principle, we mainly lighten the PatchCore method in two directions: lightning the structure of the feature extractor and selecting the main features of feature memory bank, and then compare its performance with the original version. The experimental results show an order of magnitude reduction in hardware and time consumption reduction, while the performance remains almost the same. © 2025

关键词： Deep learning Industrial defect detection Lightweighting Multimodal imaging data One-class novelty detection SMD-PCB inspection

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