Article
Engineering, Electrical & Electronic
Fengyi Chen, Xingyong Li, Ruohui Wang, Xueguang Qiao
Summary: A method for improving the sensitivity of FBG accelerometers by using a shorter FBG inscribed in single mode fiber with thinner cladding was proposed and demonstrated. Experimental results showed a 5-fold sensitivity enhancement compared to traditional 125-mu m-diameter fiber, with a working frequency bandwidth from 0.5 Hz to 30 Hz.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Kirill Tomyshev, Egor I. Dolzhenko, Alexandra D. Vasilyeva, Lyubov V. Yurina, Oleg V. Butov
Summary: This paper reports on the development of tilted fiber Bragg grating-assisted selective biosensors. The sensors utilize the dependence of optical evanescent field parameters on the composition of the medium under study. Antibodies against fibrinogen and D-dimer are used as functional coatings to enable selective sensitivity to specific proteins. The study demonstrates this selectivity by simultaneous measurements using a pair of sensors functionalized with different antibodies.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Review
Engineering, Electrical & Electronic
Chen Zhu, Yiyang Zhuang, Bo Liu, Jie Huang
Summary: Fiber optic displacement sensors play a significant role in various scientific and engineering fields, and significant advancements have been made in the past two decades. This article provides a comprehensive review of different types of fiber optic displacement sensing techniques and discusses the challenges and prospects for future research.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Biochemical Research Methods
Catia Tavares, Catia Leitao, Daniela Lo Presti, M. F. Domingues, Nelia Alberto, Hugo Silva, Paulo Antunes
Summary: This study proposes a 3D-printed sensor based on fiber Bragg grating (FBG) technology for monitoring respiratory rate (RR) and heart rate (HR). The selected sensor demonstrates high reproducibility and sensitivity to chest wall deformations caused by breathing and heartbeats, making it a valuable solution for easy fabrication.
BIOMEDICAL OPTICS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
H. Suma, Vikram Ramanan, S. R. Chakravarthy, Balaji Srinivasan
Summary: This article introduces the development and testing of compact and field-deployable optical fiber-based modules for sensing chemiluminescence and pressure variations in the combustor. The data-driven method based on symbolic time series analysis is found to be robust in predicting instability. The fiber optic sensor modules compare favorably with conventional sensors, providing a new pathway for field-deployable solutions to monitor thermo-acoustic instability in combustors.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Damian Harasim
Summary: This paper presents a method to improve the reliability of liquid solution refractive index measurement using tilted fiber Bragg gratings (TFBGs), by employing a specialized setup of cascaded TFBGs to enhance the stability of cladding resonances under various light polarizations. Experimental results demonstrate the effectiveness of this approach.
Article
Engineering, Electrical & Electronic
Vincenzo Romano Marrazzo, Francesco Fienga, Dario Laezza, Michele Riccio, Andrea Irace, Salvatore Buontempo, Giovanni Breglio
Summary: Fiber Optic Sensors (FOS) are widely used in many applications, but not extensively in industrial process monitoring due to cost and complexity. The read-out system in this document overcomes limitations of commonly used FOS interrogation systems and extends areas of FOS applications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Boyuan Wang, Zhenyu Yuan, Yue Li, Yudong Li, Fanli Meng
Summary: Fast and accurate detection of pipeline leaks is crucial for reducing economic losses and ensuring personnel safety. This article presents an innovative optical fiber detection method using double fiber Bragg gratings to effectively detect both the leakage location and rate simultaneously, addressing this challenge.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Simon Pevec, Denis Donlagic
Summary: This paper presents an improved selective etching method for manufacturing nano-strain resolution fiber-optic Fabry-Perot sensors. The sensors demonstrate high spectral sensitivity, low intrinsic temperature response, and small size, comparable to conventional Fiber Bragg gratings. Additionally, they can be read-out using cost-efficient VIS/NIR spectrometers and LEDs commonly used in lighting/automotive applications. High-end FBG signal interrogator achieved a strain resolution of 1 ne, while a cost-efficient VIS spectrometer still obtained a resolution of about 20-70 ne. Absolute measurements within the nano-strain range are achievable with suitable temperature compensation.
Article
Chemistry, Analytical
Bastien Van Esbeen, Cyrille Finet, Robin Vandebrouck, Damien Kinet, Kevin Boelen, Corentin Guyot, Georges Kouroussis, Christophe Caucheteur
Summary: There is sufficient evidence to show that fiber Bragg gratings (FBGs) distributed along a railway track can provide reliable axle counting and bring numerous benefits compared to other technologies. This study introduces two innovations, including a study of strain distribution in the rail cross-section to determine sensitivity, and the deployment of FBGs along the rail track as a smart object.
Article
Engineering, Electrical & Electronic
Heming Wei, Zhe Gong, Wenjing Wu, Jiawei Che, Liang Zhang, Fufei Pang, Tingyun Wang
Summary: A broadband fiber-optic acoustic sensing system is proposed and demonstrated, which can detect acoustic waves with frequencies from tens of hertz to hundreds of kilohertz, showing great potential for acoustic emission detection in real applications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Kuikui Guo, Jun He, He Li, Baijie Xu, Shengzhen Lu, Shen Liu, Xizhen Xu, Gaixia Xu, Yiping Wang
Summary: This study introduces a method for fabricating ultra-short Type II FBGs using femtosecond laser technology, which can be used for high temperature sensing and precise temperature field distribution measurements with high spatial resolution, showing promising applications in a large-scale fiber sensor network.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Haoyan Zang, Shuiquan Pang, Benliang Zhu, Hongchuan Zhang, Hai Li, Sergej Fatikow, Xianmin Zhang
Summary: This article presents a cantilever-type fiber Bragg grating (FBG)-based microforce sensor with micro-Newton resolution, which is essential for the detection of micro-forces in the micro-/nanomanipulation process. The sensor has a resolution of 7 μN force in the range of 10 mN, and it is successfully applied in the mechanical property test of the zebrafish embryo.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Xiao-Yu Yan, Xian-Feng Wang, Guo-Ping Ding, Lei Feng, Yan-Juan Wang
Summary: This study investigates a life assessment method for carbon fiber-reinforced plastic upper frames using fiber Bragg grating sensors. A measuring system based on optical fiber sensing technology is developed for fatigue life monitoring, and the effectiveness of the system is verified through analysis of fatigue simulation results and measured data. Experimental results show that the system designed by optical fiber sensing technology accurately detects the fatigue life of the carbon fiber composite upper arm.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Edson A. Souza, Leandro C. Macedo, Anselmo Frizera, Carlos Marques, Arnaldo Leal-Junior
Summary: This paper presents the development, analysis, and application of a fiber Bragg grating (FBG) array for 2D shape reconstruction in a cantilever beam. The authors used the finite element method to numerically analyze the strain distribution in the structural elements made of Pinus wood and Nylon 6.0 under constant loading. They also proposed a temperature compensation method to decouple the temperature cross-sensitivity in the deflection analysis.
Article
Water Resources
L. F. Murillo-Bermudez, A. L. S. Salustiano-Martim, C. Poleto, J. G. Dalfre Filho
Summary: Measurements of suspended sediment discharge play a significant role in assessing the impacts of the process and formulating management actions. Substitute technologies, such as turbidity measurements, are employed for monitoring watersheds where direct hydrosedimentological data is not easily obtainable. This study designed an adaptation of turbidimetric data for the verification and secondary use of a drinking water treatment company's data. Empirical correlations between suspended sediments concentration and turbidity were established using direct measurements and particle size distribution evaluations. The study validated the objective of reusing secondary data for hydrosedimentological purposes and highlighted the potential applications of this method where in situ turbidity equipment is not available.
INTERNATIONAL JOURNAL OF RIVER BASIN MANAGEMENT
(2023)
Article
Optics
Darcy L. Smith, Linh Nguyen, David J. Ottaway, Thiago D. Cabral, Eric Fujiwara, Cristiano M. B. Cordeiro, Stephen C. Warren-Smith
Summary: In this paper, we demonstrate that deep learning improves the analysis of fiber specklegrams for sensing, and apply it to measurements of air temperature and water immersion length. We compare deep neural networks (DNNs) including a convolutional neural network and a multi-layer perceptron network with a traditional correlation technique using data from a multimode fiber exposed-core fiber. We also show the ability of the DNNs to be trained against random noise sources like specklegram translations.
Article
Engineering, Electrical & Electronic
Thiago D. Cabral, Douglas F. Franco, Eric Fujiwara, Marcelo Nalin, Cristiano M. B. Cordeiro
Summary: We report on optical fiber specklegram sensors (FSSs) for magnetic field measurements. The compact probes consist of no-core fibers doped with terbium oxide (Tb4O7), significantly improving the Verdet constant and enhancing the modulation of the output specklegram. By using a simple setup with a He-Ne laser and inexpensive CCD camera, comparable results to fiber sensors based on more complex setups were obtained.
IEEE SENSORS JOURNAL
(2023)
Article
Environmental Sciences
Luiz Souza Costa Filho, Jose Gilberto Dalfre Filho, Paulo Vatavuk, Edevar Luvizotto Junior
Summary: Valves are commonly used in building installations, such as shower control valves, and advancements in technology have led to improved performance and reduced water and energy consumption. This study presents a new model of hydraulic valve for building installations, designed to decrease head loss, increase controllability, and eliminate external parts. Through simulations, it was found that the new valve geometry achieved a significant reduction in pressure drop coefficient compared to traditional globe valves. This resulted in lower power requirements and improved controllability, making it an environmentally-friendly choice for large-scale applications.
Article
Chemistry, Multidisciplinary
Yu Tzu Wu, Eric Fujiwara, Carlos Kenichi Suzuki
Summary: This work aims to identify the indexing radical of a hanzi from a picture through a convolutional neural network model with two layers and 15 classes. The model was validated for three calligraphy styles and achieved an average F-score of around 95.7% for classifying 15 radicals within the known styles. In unknown fonts, the F-score varied and reached around 83.0% for the best scenario. Subsequently, the model was evaluated on five ancient Chinese poems, resulting in average F-scores of around 86.0% and around 61.4%, disregarding and regarding the unknown indexing radicals, respectively.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Marco C. P. Soares, Michele Cacioppo, Francesco Amato, Thiago D. Cabral, Marcelo N. P. Carreno, Ines Pereyra, Carlos A. S. Ramos, Manuel Cid, Gilson S. Goveia, Jose F. D. Chubaci, Eric Fujiwara, Julio R. Bartoli
Summary: Fluorescent PMMA-CDs optical films were fabricated using nitrogen-doped carbon nanodots, citric acid-derived carbon nanodots, and silica-Cdots hybrids. The occlusion of nanoparticles enhances the conversion from UV to visible light, improving the efficiency of solar energy concentrators and generators. Photovoltaic cells coated with doped PMMA films showed an 11.3% increase in cell efficiency, demonstrating the feasibility and potential of these low-cost environmentally friendly materials.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Jonas H. Osorio, Thiago D. Cabral, Eric Fujiwara, Marcos A. R. Franco, Foued Amrani, Frederic Delahaye, Frederic Gerome, Fetah Benabid, Cristiano M. B. Cordeiro
Summary: The research on high-performance hollow-core photonic crystal fibers has achieved impressive progress, making it a common strategy for building various optical systems. This paper proposes and demonstrates a speckle-based displacement sensor using a large-core tubular-lattice fiber, which has been inserted with and suitably displaced a single-mode fiber. Both simulation and experimental studies have been conducted, showing a displacement resolution of 0.7 μm. This investigation identifies a new opportunity for the application of large-core hollow fibers in the sensing framework, expanding the range of applications for this fiber family.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Eric Fujiwara, Lidia O. Rosa, Hiromasa Oku, Cristiano M. B. Cordeiro
Summary: Biodegradable optical waveguides made of agar show great potential for light delivery and sensing in biomedical and environmental applications. We propose an all-optical, biodegradable electric current sensor utilizing agar's thermal effect and refractive index modulation. By connecting the optical device to a DC voltage source and exciting the agar sample with coherent light, we can measure the input amperage based on the motion of speckle fields.
SCIENTIFIC REPORTS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Juan Felipe Serighelli, Eric Fujiwara, Cristiano M. B. Cordeiro
Summary: This study reports on the quantitative biospeckle measurements in tomatoes at different ripening stages by using a low-cost webcam and a correlation method. The 543 and 633 nm lasers were used as light sources similar or complementary to the tomato color. A new metric based on the ratio of biospeckle activity at two wavelengths was proposed to differentiate biological samples at different stages.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Marco Soares, Francesco Amato, Thiago Cabral, Michele Cacioppo, Marcelo Carreno, Ines Pereyra, Carlos Ramos, Manuel Cid, Gilson Goveia, Jose Chubaci, Maurizio Prato, Julio Bartoli, Eric Fujiwara
Summary: Nitrogen-doped carbon nanodots synthesized from L-arginine and ethylenediamine (NCNDs) were combined with PMMA to obtain fluorescent nanocomposites. Coating photovoltaic cells with these materials showed a promising 11.3% increase in cell efficiency, demonstrating the feasibility and potential for application of these environmentally friendly materials.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Yu Tzu Wu, Eric Fujiwara
Summary: This paper presents a simple piano-inspired interface using an optical fiber specklegram quasi-distributed sensor to play a full C major scale. Users input musical notes via foam pads connected to a multimode optical fiber, which is then correlated with reference specklegrams to retrieve the note input. The interface achieves a precision of approximately 0.94% for eight musical notes and a neutral state, independent of the input order.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Jonas H. Osorio, Thiago D. Cabral, Eric Fujiwara, Marcos A. R. Franco, Foued Amrani, Frederic Delahaye, Frederic Gerome, Fetah Benabid, Cristiano M. B. Cordeiro
Summary: In this study, we investigated the use of a large-core hollow fiber as a platform for displacement sensing. By inserting and moving a single-mode fiber in the hollow core, we were able to achieve a speckled intensity profile at the output of the hollow fiber. Our results suggest that this approach holds promise for exploring the multimode characteristics of hollow fibers in sensing applications.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Matheus S. Rodrigues, Eric Fujiwara
Summary: This paper presents a straightforward and low-cost method for assessing the deflection of flexible elements in the field of soft robotics. The sensor, composed of an optical fiber specklegram transducer coupled to a cantilever-type manipulator, achieves absolute sensitivities of 0.37 N-1 and 0.05 cm(-1) for force and deflection measurements, respectively, with good agreement between simulation and experimental validation.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Lidia O. Rosa, Eduarda F. Morais, Cristiano M. B. Cordeiro, Eric Fujiwara
Summary: This work presents the method for fabricating agar ball lenses and highlights their biodegradable, edible, and renewable properties. The study demonstrates the feasibility of agar lenses for imaging and suggests potential applications.
2023 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS, OMN AND SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, SBFOTON IOPC
(2023)
