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1,964 Results Found

  • Article
  • Open Access
3 Citations
966 Views
20 Pages

21 June 2025

With the advent of 6G technologies, satellite communication networks are in urgent need of innovative bearer technologies to meet the demands of government and enterprise private lines as well as computing power networks. We propose optical service u...

  • Proceeding Paper
  • Open Access
1 Citations
1,681 Views
6 Pages

In traditional passive optical network (PON) neighboring, optical network units (ONUs) cannot communicate directly but through optical line terminals, resulting in propagation delays, security hazards and unnecessary use of upstream and downstream ba...

  • Article
  • Open Access
10 Citations
3,099 Views
28 Pages

24 December 2019

Optical methods are frequently used as a routine method to obtain the elementary sampling unit (ESU) leaf area index (LAI) of forests. However, few studies have attempted to evaluate whether the ESU LAI obtained from optical methods matches the accur...

  • Article
  • Open Access
6 Citations
4,989 Views
18 Pages

Automated Chemical Sensing Unit Integration for Parallel Optical Interrogation

  • Ana L Hernandez,
  • Fabian Dortu,
  • Theo Veenstra,
  • Paula Ciaurriz,
  • Rafael Casquel,
  • Iñaki Cornago,
  • Hendrik V Horsten,
  • Edurne Tellechea,
  • María V Maigler and
  • Miguel Holgado
  • + 1 author

20 February 2019

We report the integration of an automated chemical optical sensing unit for the parallel interrogation of 12 BICELLs in a sensing chip. The work was accomplished under the European Project Enviguard (FP7-OCEAN-2013-614057) with the aim of demonstrati...

  • Article
  • Open Access
795 Views
22 Pages

16 October 2025

For large-scale measurement of microbubble parameters on the ocean surface beneath breaking waves, a buoy-type bubble sensor (BBS) is proposed. This sensor integrates a panoramic bubble imaging sub-sensor with a circular array fiber-optic sub-sensor....

  • Article
  • Open Access
19 Citations
3,197 Views
14 Pages

Non-Invasive Acoustic Monitoring of Gas Turbine Units by Fiber Optic Sensors

  • Konstantin V. Stepanov,
  • Andrey A. Zhirnov,
  • Stanislav G. Sazonkin,
  • Alexey B. Pnev,
  • Alexander N. Bobrov and
  • Dmitriy A. Yagodnikov

24 June 2022

In this article, we study the possibility of gas turbine unit (GTU) monitoring using interferometric fiber optic sensors. We used the Mach–Zehnder interferometer (MZI) scheme, which can be easily implemented and simply installed on the turbine,...

  • Article
  • Open Access
1,447 Views
15 Pages

10 November 2024

Metasurfaces composed of silicon nanogap units have a variety of optical resonances, including bound states in the continuum (BIC). We show comprehensive numerical results on metasurfaces of Si-nanogap units, analyze the optical resonances, and clari...

  • Review
  • Open Access
8 Citations
6,820 Views
18 Pages

It is 21 years since the first passive optical network (PON) was standardized as an asynchronous transfer mode passive optical network (APON) with same optical distribution network scheme as we know in current networks. A lot of PON networks were sta...

  • Article
  • Open Access
1 Citations
1,682 Views
12 Pages

Stiffness Analysis and Verification of Hydraulic Supporting Units for In-Situ Optical Testing of a 500 mm-Diameter Mirror

  • Deyi Dong,
  • Di Zhou,
  • Yuhan Jiang,
  • Lianqiang Wang,
  • Chao Li,
  • Haifei Hu,
  • Yingjun Guan and
  • Minghui Gao

21 September 2022

A hydraulic in-situ support system is commonly used in the optical testing of mirrors, since it is convenient to unload the gravity of a mirror to be measured without the risk of being turned over or moved to another place. The existing supporting st...

  • Article
  • Open Access
3 Citations
3,350 Views
37 Pages

A Novel Underwater Wireless Optical Communication Optical Receiver Decision Unit Strategy Based on a Convolutional Neural Network

  • Intesar F. El Ramley,
  • Nada M. Bedaiwi,
  • Yas Al-Hadeethi,
  • Abeer Z. Barasheed,
  • Saleha Al-Zhrani and
  • Mingguang Chen

10 September 2024

Underwater wireless optical communication (UWOC) systems face challenges due to the significant temporal dispersion caused by the combined effects of scattering, absorption, refractive index variations, optical turbulence, and bio-optical properties....

  • Article
  • Open Access
10 Citations
5,394 Views
24 Pages

5 January 2023

With advances in the Internet of Things, patients in intensive care units are constantly monitored to expedite emergencies. Due to the COVID-19 pandemic, non-face-to-face monitoring has been required for the safety of patients and medical staff. A co...

  • Article
  • Open Access
528 Views
16 Pages

1 December 2025

Optical encoders are high-precision positioning sensors based on the principle of grating diffraction. However, harmonic distortion remains a critical factor limiting the further improvement of measurement accuracy. In response to this challenge, thi...

  • Article
  • Open Access
1 Citations
1,623 Views
12 Pages

17 February 2025

Background/Objectives: Cerebrovascular events (CVEs) are a leading cause of intensive care unit (ICU) admissions from the emergency department, often associated with high morbidity and mortality rates. Identifying reliable, non-invasive predictors of...

  • Article
  • Open Access
7 Citations
3,408 Views
16 Pages

6 August 2024

This paper proposes a unique configuration for an all-optical D Flip Flop (D-FF) utilizing a quasi-square ring resonator (RR) and T-Splitter, as well as NOT and OR logic gates within a 2-dimensional square lattice photonic crystal (PC) structure. The...

  • Feature Paper
  • Article
  • Open Access
21 Citations
6,843 Views
21 Pages

A Comparative Study of Markerless Systems Based on Color-Depth Cameras, Polymer Optical Fiber Curvature Sensors, and Inertial Measurement Units: Towards Increasing the Accuracy in Joint Angle Estimation

  • Nicolas Valencia-Jimenez,
  • Arnaldo Leal-Junior,
  • Leticia Avellar,
  • Laura Vargas-Valencia,
  • Pablo Caicedo-Rodríguez,
  • Andrés A. Ramírez-Duque,
  • Mariana Lyra,
  • Carlos Marques,
  • Teodiano Bastos and
  • Anselmo Frizera

This paper presents a comparison between a multiple red green blue-depth (RGB-D) vision system, an intensity variation-based polymer optical fiber (POF) sensor, and inertial measurement units (IMUs) for human joint angle estimation and movement analy...

  • Article
  • Open Access
9 Citations
3,095 Views
10 Pages

Design of Positioning Mechanism Fit Clearances Based on On-Orbit Re-Orientation Accuracy

  • Qingya Li,
  • Libao Yang,
  • Weiguo Zhao,
  • Zhen Shi and
  • Zhenyu Liu

5 November 2019

The factors affecting the re-orientation accuracy of the on-orbit replaceable optical unit were studied, and the mathematical models of the relationships between fit clearances of positioning mechanisms and the limits of rotation angles were deduced....

  • Article
  • Open Access
326 Views
27 Pages

23 January 2026

Salient object detection in optical remote sensing images has attracted extensive research interest in recent years. However, CNN-based methods are generally limited by local receptive fields, while ViT-based methods suffer from common defects in noi...

  • Article
  • Open Access
34 Citations
8,616 Views
10 Pages

Ultra-Fast Displaying Spectral Domain Optical Doppler Tomography System Using a Graphics Processing Unit

  • Hyosang Jeong,
  • Nam Hyun Cho,
  • Unsang Jung,
  • Changho Lee,
  • Jeong-Yeon Kim and
  • Jeehyun Kim

25 May 2012

We demonstrate an ultrafast displaying Spectral Domain Optical Doppler Tomography system using Graphics Processing Unit (GPU) computing. The calculation of FFT and the Doppler frequency shift is accelerated by the GPU. Our system can display processe...

  • Article
  • Open Access
1 Citations
2,262 Views
21 Pages

Countermeasuring MITM Attacks in Solar-Powered PON-Based FiWi Access Networks

  • Polyxeni Tsompanoglou,
  • Antonios Iliadis,
  • Konstantinos Kantelis,
  • Sophia Petridou and
  • Petros Nicopolitidis

20 February 2023

Solar power (SP) passive optical network (PON)-based fiber-wireless (FiWi) access systems are becoming increasingly popular as they provide coverage to rural and urban areas where no power grid exists. Secure operation of such networks which includes...

  • Article
  • Open Access
1 Citations
2,863 Views
16 Pages

Measuring Setup for Experimental Research of Two-Coordinate Fiber-Optic Acceleration Sensors with Cylindrical Lenses

  • Elena Badeeva,
  • Tatiana Murashkina,
  • Andrey Motin,
  • Saygid Uvaysov,
  • Ainur Kozbakova and
  • Daniel Sawicki

1 February 2022

The article presents the possibilities of using fiber-optic acceleration (FOC) sensors on products of rocket-space and aviation technology as part of information-measuring systems. A special measuring device has been developed for experimental confir...

  • Article
  • Open Access
1,245 Views
13 Pages

5 March 2025

This research introduces a novel physical-layer encryption technique for metropolitan-optimized optical transport networks (M-OTNs) that integrates real-time optical signal time-domain scrambling/descrambling with decoy-state quantum key distribution...

  • Article
  • Open Access
6 Citations
2,851 Views
11 Pages

15 December 2020

We investigated the application of a semiconductor optical amplifier (SOA) and an SOA electro-absorption modulator (SOA-EAM) as attractive, low-cost solutions in passive optical networks (PONs). The main characteristics of an SOA with optimal perform...

  • Article
  • Open Access
22 Citations
5,784 Views
12 Pages

31 January 2019

Inertial measurement units are commonly used to estimate the orientation of sections of sections of human body in inertial navigation systems. Most of the algorithms used for orientation estimation are computationally expensive and it is difficult to...

  • Article
  • Open Access
3 Citations
2,944 Views
12 Pages

Silicon-Based Metastructure Optical Scattering Multiply–Accumulate Computation Chip

  • Xu Liu,
  • Xudong Zhu,
  • Chunqing Wang,
  • Yifan Cao,
  • Baihang Wang,
  • Hanwen Ou,
  • Yizheng Wu,
  • Qixun Mei,
  • Jialong Zhang and
  • Rentao Liu
  • + 1 author

21 June 2022

Optical neural networks (ONN) have become the most promising solution to replacing electronic neural networks, which have the advantages of large bandwidth, low energy consumption, strong parallel processing ability, and super high speed. Silicon-bas...

  • Article
  • Open Access
4 Citations
2,997 Views
24 Pages

19 February 2025

All-optical computing is an emerging information processing technology. As a cutting-edge technology in the field of photonics, it effectively leverages the unique advantages of photons to achieve rapid computation. However, the lack of a fully funct...

  • Article
  • Open Access
436 Views
31 Pages

An Advantage Actor–Critic-Based Quality of Service-Aware Routing Optimization Mechanism for Optical Satellite Network

  • Wei Zhou,
  • Bingli Guo,
  • Xiaodong Liang,
  • Qingsong Luo,
  • Boying Cao,
  • Zongxiang Xie,
  • Ligen Qiu,
  • Xinjie Shen and
  • Bitao Pan

22 November 2025

To support the 6G vision of seamless “space–air–ground-integrated” global coverage, optical satellite networks must enable high-speed, low-latency, and intelligent data transmission. However, conventional inter-satellite laser...

  • Article
  • Open Access
24 Citations
3,026 Views
16 Pages

High-Capacity Free Space Optics-Based Passive Optical Network for 5G Front-Haul Deployment

  • Rahat Ullah,
  • Sibghat Ullah,
  • Waqas A. Imtiaz,
  • Jahangir Khan,
  • Peer Meher Ali Shah,
  • Muhammad Kamran,
  • Jianxin Ren and
  • Shuaidong Chen

24 September 2023

With the expansion of Information and Communication Technology, it is important to develop a communication network that can provide high-capacity ubiquitous connectivity. This work proposes an energy-efficient passive optical network (PON) using orth...

  • Article
  • Open Access
6 Citations
3,229 Views
23 Pages

Improved thermal storage capacity and reduced building energy consumption can be attained by utilizing phase-change materials (PCM) in glass enclosure structures, which can effectively utilize solar energy to improve the building’s thermal performanc...

  • Article
  • Open Access
16 Citations
6,647 Views
16 Pages

26 October 2023

Augmented reality heads-up displays (AR-HUDs) have a much richer display than traditional heads-up displays. An ideal AR-HUD requires two or more focal planes to display basic and interactive driving information to the car driver separately. We prese...

  • Article
  • Open Access
13 Citations
3,940 Views
20 Pages

Integrated Sensor-Optics Communication System Using Bidirectional Fiber and FSO Channels and Hybrid Deep Learning Techniques

  • Amare Mulatie Dehnaw,
  • Yibeltal Chanie Manie,
  • Li-Yuan Du,
  • Cheng-Kai Yao,
  • Jun-Wei Jiang,
  • Bing-Xian Liu and
  • Peng-Chun Peng

13 October 2023

This paper introduces a new bidirectional integration approach that combines fiber sensor/free space optics (FSO) communication using an intensity and wavelength division multiplexer (IWDM) techniques-based long-distance fiber Bragg grating (FBG) sen...

  • Article
  • Open Access
1,079 Views
13 Pages

Enhanced Nonlinear Optical Absorption in Fused-Ring Aromatic Donor–Acceptor–Donor Core Units of Y6 Derivatives

  • Xingyuan Wen,
  • Tianyang Dong,
  • Xingzhi Wu,
  • Jiabei Xu,
  • Xiaofeng Shi,
  • Yinglin Song,
  • Chunru Wang and
  • Li Jiang

26 June 2025

This fundamental understanding of molecular structure–NLO property relationships provides critical design principles for next-generation optical limiting materials, quantum photonic devices, and ultrafast nonlinear optical switches, addressing...

  • Article
  • Open Access
7 Citations
3,268 Views
22 Pages

30 January 2023

A redundant rotational inertial navigation system (RRINS) comprises a redundant inertial measurement unit (RIMU) and a turntable for improving reliability and navigation accuracy. Because of the multi-sensor configuration, the RIMU has a more complex...

  • Article
  • Open Access
738 Citations
64,159 Views
19 Pages

IMU-Based Joint Angle Measurement for Gait Analysis

  • Thomas Seel,
  • Jörg Raisch and
  • Thomas Schauer

16 April 2014

This contribution is concerned with joint angle calculation based on inertial measurement data in the context of human motion analysis. Unlike most robotic devices, the human body lacks even surfaces and right angles. Therefore, we focus on methods t...

  • Article
  • Open Access
8 Citations
7,245 Views
18 Pages

Improved Optical Flow Estimation Method for Deepfake Videos

  • Ali Bou Nassif,
  • Qassim Nasir,
  • Manar Abu Talib and
  • Omar Mohamed Gouda

24 March 2022

Creating deepfake multimedia, and especially deepfake videos, has become much easier these days due to the availability of deepfake tools and the virtually unlimited numbers of face images found online. Research and industry communities have dedicate...

  • Article
  • Open Access
7 Citations
5,044 Views
10 Pages

25 February 2020

Validation testing is a necessary step for inertial measurement unit (IMU) motion analysis for research and clinical use. Optical tracking systems utilize marker models which must be precise in measurement and mitigate skin artifacts. Prosthesis wear...

  • Article
  • Open Access
10 Citations
4,921 Views
11 Pages

A Portable Fluorescent Lateral Flow Immunoassay Platform for Rapid Detection of FluA

  • Xu Chen,
  • Xuhui Huang,
  • Saima Kanwal,
  • Jian Wang,
  • Jing Wen and
  • Dawei Zhang

21 May 2024

The spread of the FluA virus poses significant public health concerns worldwide. Fluorescent lateral flow immunoassay (LFIA) test strips have emerged as vital tools for the early detection and monitoring of influenza infections. However, existing qua...

  • Article
  • Open Access
12 Citations
7,001 Views
12 Pages

Split-And-Delay Unit for FEL Interferometry in the XUV Spectral Range

  • Sergey Usenko,
  • Andreas Przystawik,
  • Leslie Lamberto Lazzarino,
  • Markus Alexander Jakob,
  • Florian Jacobs,
  • Christoph Becker,
  • Christian Haunhorst,
  • Detlef Kip and
  • Tim Laarmann

25 May 2017

In this work we present a reflective split-and-delay unit (SDU) developed for interferometric time-resolved experiments utilizing an (extreme ultraviolet) XUV pump–XUV probe scheme with focused free-electron laser beams. The developed SDU overcomes l...

  • Article
  • Open Access
47 Citations
7,425 Views
9 Pages

29 February 2020

Inertial measurement unit systems are wearable sensors that can measure the movement of a human in real-time with relatively little space and high portability. The purpose of this study was to investigate the accuracy of the inertial measurement unit...

  • Feature Paper
  • Article
  • Open Access
17 Citations
6,042 Views
13 Pages

Validity and Reliability of Inertial Measurement Unit (IMU)-Derived 3D Joint Kinematics in Persons Wearing Transtibial Prosthesis

  • Jutima Rattanakoch,
  • Manunchaya Samala,
  • Weerawat Limroongreungrat,
  • Gary Guerra,
  • Kittichai Tharawadeepimuk,
  • Ampika Nanbancha,
  • Wisavaporn Niamsang,
  • Pichitpol Kerdsomnuek and
  • Sarit Suwanmana

3 February 2023

Background: A validity and reliability assessment of inertial measurement unit (IMU)-derived joint angular kinematics during walking is a necessary step for motion analysis in the lower extremity prosthesis user population. This study aimed to assess...

  • Review
  • Open Access
2 Citations
1,655 Views
12 Pages

Movement Sensing Opportunities for Monitoring Dynamic Cognitive States

  • Tad T. Brunyé,
  • James McIntyre,
  • Gregory I. Hughes and
  • Eric L. Miller

25 November 2024

In occupational domains such as sports, healthcare, driving, and military, both individuals and small groups are expected to perform challenging tasks under adverse conditions that induce transient cognitive states such as stress, workload, and uncer...

  • Article
  • Open Access
25 Citations
6,237 Views
17 Pages

12 October 2015

The goal of this presented study was to determine the optimum parameters of secondary optical elements (SOEs) for concentrated photovoltaic (CPV) units with flat Fresnel lenses. Three types of SOEs are under consideration in the design process, inclu...

  • Article
  • Open Access
1 Citations
3,556 Views
14 Pages

Functionalization of Rhodamine Platforms with 3-Hydroxy-4-pyridinone Chelating Units and Its Fluorescence Behavior towards Fe(III)

  • Carla Queirós,
  • Sílvia Vinhas,
  • Jéssica Oliveira,
  • Andreia Leite,
  • Ana M. G. Silva and
  • Maria Rangel

26 February 2022

Functionalization of xanthene fluorophores with specific receptor units is an important topic of research aiming for the development of new analytical tools for biological sciences, clinical diagnosis, food and environmental monitoring. Herein, we re...

  • Article
  • Open Access
306 Views
18 Pages

11 February 2026

This study contains a combination of a review and a related individual case study, which discusses the possibility of predicting the success of enantiomers’ optical separation using fractional crystallization of diastereomeric salts. The key id...

  • Article
  • Open Access
11 Citations
4,072 Views
24 Pages

Fuzzy Protoform for Hyperactive Behaviour Detection Based on Commercial Devices

  • Antonio-Pedro Albín-Rodríguez,
  • Adrián-Jesús Ricoy-Cano,
  • Yolanda-María de-la-Fuente-Robles and
  • Macarena Espinilla-Estévez

Hyperactive behaviour refers to a person making more movement than expected for his or her age and development, acting impulsively, and being easily distracted. There is a need to encourage early and reliable detection through the proposal of new met...

  • Article
  • Open Access
1,055 Views
22 Pages

Low-Cost AI-Enabled Optoelectronic Wearable for Gait and Breathing Monitoring: Design, Validation, and Applications

  • Samilly Morau,
  • Leandro Macedo,
  • Eliton Morais,
  • Rafael Menegardo,
  • Jan Nedoma,
  • Radek Martinek and
  • Arnaldo Leal-Junior

16 September 2025

This paper presents the development of an optoelectronic wearable sensor system for portable monitoring of the movement and physiological parameters of patients. The sensor system is based on a low-cost inertial measurement unit (IMU) and an optical...

  • Article
  • Open Access
41 Citations
9,844 Views
26 Pages

Accuracy and Acceptability of Wearable Motion Tracking for Inpatient Monitoring Using Smartwatches

  • Chaiyawan Auepanwiriyakul,
  • Sigourney Waibel,
  • Joanna Songa,
  • Paul Bentley and
  • A. Aldo Faisal

19 December 2020

Inertial Measurement Units (IMUs) within an everyday consumer smartwatch offer a convenient and low-cost method to monitor the natural behaviour of hospital patients. However, their accuracy at quantifying limb motion, and clinical acceptability, hav...

  • Article
  • Open Access
14 Citations
5,595 Views
19 Pages

Machine Learning for Optical Motion Capture-Driven Musculoskeletal Modelling from Inertial Motion Capture Data

  • Abhishek Dasgupta,
  • Rahul Sharma,
  • Challenger Mishra and
  • Vikranth Harthikote Nagaraja

Marker-based Optical Motion Capture (OMC) systems and associated musculoskeletal (MSK) modelling predictions offer non-invasively obtainable insights into muscle and joint loading at an in vivo level, aiding clinical decision-making. However, an OMC...

  • Article
  • Open Access
9 Citations
3,957 Views
12 Pages

2 June 2022

Inertial Measurement Units (IMUs) have gained popularity in gait analysis and human motion tracking, and they provide certain advantages over stationary line-of-sight-dependent Optical Motion Capture (OMC) systems. IMUs appear as an appropriate alter...

  • Article
  • Open Access
15 Citations
3,756 Views
10 Pages

11 October 2018

Recently developed graded photonic super-crystals show an enhanced light absorption and light extraction efficiency if they are integrated with a solar cell and an organic light emitting device, respectively. In this paper, we present the holographic...

  • Review
  • Open Access
81 Citations
15,538 Views
28 Pages

29 January 2022

As an important application in remote sensing, landcover classification remains one of the most challenging tasks in very-high-resolution (VHR) image analysis. As the rapidly increasing number of Deep Learning (DL) based landcover methods and trainin...

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