Article
Engineering, Electrical & Electronic
Song Gao, Zengrun Wen, Haiyang Wang, Chams Baker, Liang Chen, Yangjian Cai, Xiaoyi Bao
Summary: Stimulated Brillouin scattering and the longitudinal strain performance based on BOTDA in a nonuniform As2Se3-PMMA tapered fiber areinvestigated. The strain performance of the BGS frequency shift and the BGS linewidth change under the imposed longitudinal strain are analyzed. A strain-insensitive BGS linewidth is achieved by selecting the fiber gain section along the nonuniform As2Se3-PMMA tapered fiber.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Review
Chemistry, Analytical
Zengrun Wen, Ziqing Guan, Jingru Dong, Hongxin Li, Yangjian Cai, Song Gao
Summary: This paper summarizes the methods of sensitivity enhancement in interferometer-based fiber optic sensors, and derives the five parameters related to sensitivity using the modal coupling interferometer as an example. The research papers modulating these parameters to enhance sensing sensitivity are reviewed in the literature.
Article
Optics
Ce Bian, Minxuan Li, Wei Cao, Manli Hu, Zhiqin Chu, Ruohui Wang
Summary: In this study, a robust method for integrating nanodiamonds with nitrogen-vacancy (NV) centers into optical fiber was developed and experimentally demonstrated for all-optical thermometry application. The efficiency of NV fluorescence can be enhanced by adjusting the thickness of UV adhesive film and additional aluminum film deposition, paving the way for developing fiber-based quantum thermometry and magnetometry.
CHINESE OPTICS LETTERS
(2021)
Article
Medicine, General & Internal
Edem Allado, Mathias Poussel, Justine Renno, Anthony Moussu, Oriane Hily, Margaux Temperelli, Eliane Albuisson, Bruno Chenuel
Summary: The study evaluated the accuracy of remote photoplethysmography imaging in measuring respiratory rate and found good agreement with standard measurement methods, allowing for clinical use.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Optics
Kejun Shang, Ming Lei, Haowei Li, Tianqi Zhang, Xiaozhi Yu, Qiang Xiang, Yonglin Na, Lizhe Zhang
Summary: This study presents a novel interferometric fiber optic gyroscope (IFOG) utilizing an integrated optical chip, application-specific integrated circuit, and small-diameter sensing coil. The prototype has an overall size of 30 mm x 30 mm x 30 mm and weighs 68 g, making it the smallest closed-loop IFOG currently known. Static experiments demonstrate that the bias stability of the integrated IFOG closely matches the theoretical accuracy limit determined by the fiber coil, meeting the requirements of near-navigation-grade compact inertial navigation systems.
CHINESE OPTICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Philip Mehrgardt, Matloob Khushi, Simon Poon, Anusha Withana
Summary: This study introduces a multimodal heart rate and phase sensing device, along with a deep learning model that can accurately derive heart rate by fusing multi-channel data. Experimental results demonstrate improved accuracy in heart rate measurements under different activities like stationary, walking, and running.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Kaiming Yang, Bonan Liu, Changrui Liao, Yongxue Wang, Zhihao Cai, Jian Tang, Yatao Yang, Yiping Wang
Summary: The sensor proposed in this study is based on PBP-FBG and utilizes spectrum loss, Bragg dip shifts, and cut-off mode shift to measure surrounding liquid level, temperature, and refractive index respectively. It provides a simple and reliable method for accurate measurements in hazardous environments.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Qing Wang, Yi Zhang, Guannan Chen, Zhihao Chen, Hwan Ing Hee
Summary: A novel optical fiber sensor utilizing a deep learning model was developed to measure perioperative heart rate and respiratory rate signals. The model outperformed traditional algorithms and showed potential for future clinical applications in monitoring non-stationary vibration signals like HR and RR.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Analytical
Olli-Pekka Nuuttila, Elisa Korhonen, Jari Laukkanen, Heikki Kyrolainen
Summary: This study examined the validity of the wrist-based photoplethysmography (PPG) method to measure heart rate (HR) and heart rate variability (HRV) at rest. The results showed that PPG was able to measure HR and HRV with adequate accuracy in recreational athletes. However, systematic overestimation should be acknowledged in certain cases.
Article
Engineering, Civil
Ewa M. Nowara, Tim K. Marks, Hassan Mansour, Ashok Veeraraghavan
Summary: Imaging photoplethysmography (iPPG) has the potential to enhance driver safety systems by detecting driver fatigue and early heart failure in a non-invasive manner. However, iPPG faces challenges in the driving context due to illumination and motion. This paper proposes two innovations to overcome these challenges: using narrow-band near-infrared video recordings to reduce illumination variations, and introducing a novel optimization algorithm called AutoSparsePPG that improves performance compared to existing methods.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Instruments & Instrumentation
Changrui Liao, Tianhang Yang, Jinli Han
Summary: Fabrication of silica microfiber Bragg grating using femtosecond laser point-by-point inscription has significantly reduced the time constant to around 21ms, one order of magnitude lower than traditional single-mode fiber Bragg grating. The temporal thermal response was measured using CO2 laser thermal excitation method.
Review
Chemistry, Analytical
Erik Vavrinsky, Niloofar Ebrahimzadeh Esfahani, Michal Hausner, Anton Kuzma, Vratislav Rezo, Martin Donoval, Helena Kosnacova
Summary: Optical sensors are increasingly important in medical diagnostic devices, offering excellent metrological properties, immunity to electromagnetic interference, and electrical safety. Their use enables better continuous diagnostics and the development of telemedicine.
Article
Multidisciplinary Sciences
Stefan Borik, Simon Lyra, Volker Perlitz, Micha Keller, Steffen Leonhardt, Vladimir Blazek
Summary: Distributed cutaneous tissue blood volume oscillations provide information on autonomic nervous system regulation and thermoregulation. We present a method for evaluating phase shifts in forehead cutaneous perfusion using photoplethysmography imaging. Time waveforms became increasingly desynchronized throughout measurements, and the cold pressure test triggered an increase in phase shifts.
SCIENTIFIC REPORTS
(2022)
Article
Medicine, General & Internal
Edem Allado, Mathias Poussel, Anthony Moussu, Oriane Hily, Margaux Temperelli, Asma Cherifi, Veronique Saunier, Yohann Bernard, Eliane Albuisson, Bruno Chenuel
Summary: The study evaluated the accuracy of remote photoplethysmography imaging (rPPGc) system in measuring heart rate compared to contact point measurement methods. Results showed a good correlation and accuracy between the rPPGc system and the gold standard, paving the way for more precise care through telemedicine.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Multidisciplinary Sciences
Bin Lin, Jing Tao, Jingjing Xu, Liang He, Nenrong Liu, Xianzeng Zhang
Summary: Continuous monitoring of vital signs is a hot topic in healthcare, and a dual-path estimation method based on video magnification and deep learning is proposed to address common issues in remote photoplethysmography. The method shows promise for potential clinical applications.
Article
Engineering, Electrical & Electronic
Omar Teran-Jimenez, Grissel Rodriguez-Roldan, Daniel Hernandez-Rivera, Ernesto Suaste-Gomez
IEEE SENSORS JOURNAL
(2017)
Article
Chemistry, Analytical
Daniel Hernandez-Rivera, Grissel Rodriguez-Roldan, Rodrigo Mora-Martinez, Ernesto Suaste-Gomez
Article
Engineering, Electrical & Electronic
Ernesto Suaste-Gomez, Daniel Hernandez-Rivera, Nataly A. Garcia-Morales, Geovanny Palomino-Roldan, Hector Reyes-Cruz
IEEE TRANSACTIONS ON MAGNETICS
(2020)
Article
Physics, Condensed Matter
Nataly Asul Garcia-Morales, Jose de Jesus Agustin Flores-Cuautle, Carlos Omar Gonzalez Moran, Daniel Hernandez Rivera, Ernesto Suaste-Gomez
Summary: This study compares the dielectric constant and hysteresis loops of BaTiO3 ceramics with and without Pt implants to investigate the effect of the implant on ceramic behavior. The results show that the metallic implant alters the ceramic's coercive field, remanent polarization, and dielectric constant, as well as the internal structure and ferroelectric properties of the material.
FERROELECTRICS LETTERS SECTION
(2023)
Article
Chemistry, Multidisciplinary
Daniel Hernandez-Rivera, Simei Darinel Torres-Landa, Miriam Rangel-Ayala, Vivechana Agarwal
Summary: This study introduces a novel method for evaluating the UVA protection capacity of commercial sunscreens using PVDF-based films doped with plant derived photoluminescent carbon dots. The method is simple and effective in identifying sunscreens with limited UVA protection. The study also explores the potential use of PVDF/CD material in the fabrication of cool light emitting WLEDs.
