Article
Chemistry, Analytical
Na Zhao, Zhongkai Zhang, Qijing Lin, Kun Yao, Liangquan Zhu, Yi Chen, Libo Zhao, Bian Tian, Ping Yang, Zhuangde Jiang
Summary: In electrohydrostatic drive actuators, there is a need for temperature and pressure monitoring in complex environments. This paper proposes a gold-plated Fiber Bragg grating (FBG) sensor that has high sensitivity to both temperature and pressure, enabling simultaneous measurement of both parameters. Experimental results show that the temperature sensitivity of the gold-plated FBG is 3 times that of the quartz FBG, while the pressure response sensitivity is the same. Therefore, this sensor has great potential for health monitoring in complex environments with high temperature and high pressure.
Article
Optics
Jun Wu, Zhengying Li, Xuelei Fu, Minlang Fan, Xin Gui, Honghai Wang
Summary: A high dynamic range distributed acoustic sensing (DAS) system is demonstrated based on a dual-wavelength interferometric acoustic sensor array, achieving significantly enhanced dynamic range through 2λ linear regression phase unwrapping.
Article
Optics
Yang Sun, Yicun Yao, Huijuan Niu, Hao Zha, Liqiang Zhang, Zhen Tian, Nan-Kuang Chen, Yingying Ren
Summary: In this work, a novel fiber wavelength notch filter induced by femtosecond laser point-by-point technique is proposed. The filter, consisting of a pair of slightly shifted gratings around a fiber taper, exhibits similar properties as phase shifted Bragg grating but with a more facile fabrication process. Importantly, it allows for simultaneous modulation of peak position and bandwidth. The proposed fiber notch filter has potential applications in the areas of multi-parameter sensing and tunable fiber lasing.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Guozhen Yao, Yimeng Yin, Yongqian Li, Haonan Yi
Summary: Optical fiber sensing technology, specifically the demodulation of fiber Bragg grating (FBG) sensors, is crucial for the accuracy and stability of sensing in the Internet of Things. The proposed composite gas cell demodulation scheme based on spectrum correction and data fusion has successfully improved the demodulation performance of FBG sensors in terms of accuracy and stability, with significant results shown in experiments.
Article
Engineering, Electrical & Electronic
Dongpo Xu, Dequan Feng, Qiang Chen, Guoquan Liu, Xueguang Qiao
Summary: This paper presents a novel temperature and pressure sensor that is small in size but has a large measurement range, enabling accurate temperature and pressure measurement in oil and gas wells. The feasibility of the sensor is confirmed through theoretical calculations and simulations, and the relationship between the sensor structure and the wavelength of the fiber Bragg grating is established. The sensor structure is optimized through simulations to enhance its performance. Experimental results validate the sensor's ability to independently measure temperature and pressure, with a pressure range of 0-40 MPa, a sensitivity of 24.05 pm/MPa, a linearity of 0.9997, and a repeatability of 0.0038. The temperature measurement range is 25-200°C, with a sensitivity of 31.16 pm/°C. The sensor is packaged with solid glass particles, allowing for prolonged operation in high-temperature environments.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Analytical
Takhmina Ayupova, Madina Shaimerdenova, Daniele Tosi
Summary: In this work, a gold-coated shallow-tapered chirped fiber Bragg grating (stCFBG) for dual refractive index (RI) and temperature sensing is presented. The stCFBG demonstrates high sensitivity, low cross-talk values, and is suitable for biosensing and chemical analyte detection.
Article
Chemistry, Analytical
Shiuh-Chuan Her, Shin-Zhong Weng
Summary: The fiber Bragg grating sensor integrated with an epoxy diaphragm is used for measuring pressure and water level. The thickness of the epoxy diaphragm affects the sensitivity and accuracy of the sensor, with a decrease in sensitivity as the diaphragm thickness increases. Experimental results show a close agreement between the pressure measured by the FBG sensor and theoretical predictions.
Article
Engineering, Electrical & Electronic
Dongtao Hu, Shanke Lv, Yongxing Guo, Huagang He, Jiayi Liu
Summary: The article presents a fiber Bragg grating (FBG) force sensor with enhanced sensitivity using a strain-reinforcing mechanism, achieving high sensitivity and good performance, demonstrating potential for superior structural health monitoring.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Abdollah Malakzadeh, Mohsen Mansoursamaei, Rasoul Pashaie
Summary: This study proposes a new method for simultaneous measurement of temperature and strain using a single uniform FBG, based on peak power changes and Bragg wavelength shifts. The peak power and Bragg wavelength of the FBG are sensitive to strain changes and temperature, allowing for accurate measurement of both parameters.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Wenjie Dang, Zeren Li, Jinxiao Dan, Pengyu Nan, Guoguo Xin, Kok -Sing Lim, Harith Ahmad, Hangzhou Yang
Summary: A fiber Bragg grating (FBG) based sensor is proposed for measuring gas pressure under extreme temperature conditions. The FBG sensors show low sensitivity to pressure changes at room temperature, but higher sensitivity at higher temperatures. An interesting approach based on a 2 x 2 characteristics matrix is demonstrated for discriminative measurement of pressure and temperature.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Bing Lv, Wentao Zhang, Wenzhu Huang, Fang Li
Summary: This study demonstrates a switchable dual-wavelength random fiber laser (DW-RFL) with a compact structure and a low-threshold. A Fabry-Perot interferometer consisting of a pair of fiber Bragg gratings is used as a filter in the DW-RFL to select two lasing wavelengths. By utilizing a random Bragg grating array (RBGA) instead of long-distance single mode fiber, the threshold is reduced and the stability is improved. Wavelength selection and switching can be achieved by tuning the pump power. The proposed DW-RFL has potential applications in microwave or terahertz generation systems, optical sensing, coherent communication, and high-resolution measurements.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Yuriy S. Borisov, Azat M. Nizametdinov, Oleg Ivanov, Aleksey A. Chertoriyskiy
Summary: In this study, we demonstrate the feasibility of measuring reflection spectra of fiber Bragg gratings by tuning the wavelength of a commercially available laser diode. Two tuning methods, temperature and current tuning, are investigated. Both methods achieve a wavelength resolution of 2 pm, and it is shown that current tuning allows interrogation of fiber Bragg gratings at frequencies up to 100 kHz. Using the proposed methods, the shift of the reflection spectra of a fiber Bragg grating upon heating has been measured.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Zonglun Che, Pan Xu, Chunyan Cao, XiJia Gu, Lina Ma, Jing Zhu, Jun Wang
Summary: A multi sub-grating two-dimensional optical fiber grating based on a 2D spatially encoded phase mask is designed in this study, which allows for multi-wavelength output and provides a new idea for multi-wavelength multiplexing.
Article
Instruments & Instrumentation
Xuefeng Mao, Xiao Zhou, Hao Ye, Yuting Tan, Yuan Luo
Summary: A fast and real-time demodulation scheme for dynamic fiber Bragg grating (FBG) based on a swept laser is proposed in this study. The algorithm utilizes a neighborhood average algorithm to achieve high resolution and stability in Bragg wavelength interrogation. Experimental results show that the proposed algorithm achieves a Bragg wavelength resolution of 0.11 pm at a laser scanning frequency of 40 kHz. Compared with Buneman wavelength estimation algorithm and other commonly used FBG peak search algorithms, the proposed algorithm demonstrates low computational cost, high sensitivity, and stability.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Yifan Shi, Yan Mao, Xiaoqiang Xu, Jialong Xia
Summary: This article presents a flexible sensor based on fiber Bragg gratings and a spiral surrounding structure design. By using a convolutional neural network and machine learning techniques, the sensor can achieve high-precision angle recognition. Experimental results demonstrate that this sensing system can meet the application requirements of biomimetic robots and clinical surgical operations.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yanning Xu, Wei Fan, Hong Gao, Xueguang Qiao
Summary: A low-frequency accelerometer based on Fiber Bragg Grating (FBG) and spring structure is proposed to meet the needs of seismic wave monitoring in low-frequency oil exploration. The experimental results show that the accelerometer has high sensitivity, sufficient operating range, and is expected to be suitable for low-frequency oil exploration.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Wenlei Li, Ruping Lin, Guangwei Chen, Gaoli Geng, Peng Xu, Yining Yang, Xinliang Wang, Jian Xu
Summary: We present experimental findings of three types of bound solitons in Erbium-doped fiber lasers using black phosphorus saturable absorber. The passively mode-locked laser generates stretched-pulse state, double-pulse, and four-pulse bound states with sech2-shaped pulse profile. By adjusting the polarization state, the laser can also achieve Lorentzian autocorrelation trace with a duration of approximately 562 fs and deliver Lorentzian double-pulse bound state with pulse separations of approximately 5.04 ps. This research demonstrates the possibility of obtaining different types of bound state pulses in the same fiber laser and provides a foundation for further studies on bound state pulses.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Weizong Zheng, Mingyue Wang, Yingxuan Liu, Caihong Cheng, Ya-nan Zhang
Summary: A method for preparing PDMS-based fiber structure and its performance for VOC gas sensing were reported in this paper. The sensor demonstrated good sensitivity and excellent characteristics.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Ali Golmohammadi, Navid Hasheminejad, David Hernando, Steve Vanlanduit, Wim Van den Bergh
Summary: In recent years, the use of Fiber Bragg Grating (FBG) sensor technology has become increasingly popular in various engineering applications, especially for structural health monitoring purposes. FBG sensors have advantages such as small size, immunity to electromagnetic interference, resistance to corrosion, and high accuracy and sensitivity. However, the presence of noise in FBG sensor signals affects measurement precision, making denoising an important aspect of FBG sensor systems. This study evaluated the performance of discretized wavelet transform (DWT) for denoising FBG signals using strain data collected from FBG sensors embedded in a road section. The results showed successful denoising of FBG signals and preservation of low amplitude strains without any loss of valuable data.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
P. J. Reyes-Iglesias, A. Ortega-Monux, D. Izquierdo, I. Garces, I. Molina-Fernandez
Summary: The study proposes a novel experimental setup and a signal-to-noise ratio expression to simplify the experimental characterization of high-performance colorless coherent receivers.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Liwen Xiong, Haihua Zhong, Shengpeng Wan, Junsong Yu
Summary: This study utilized a monitoring system based on a single-point curved fiber pulse sensor to collect pulse wave signals from a human radial artery. The features of the signals were used to estimate pulse wave transit time and blood pressure values, and the results met the criteria set by the Advancement of Medical Instrumentation. This real-time monitoring system shows potential in predicting human physiological signals.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Yuanfei Gong, Benli Yu, Jinhui Shi, Dong Guang, Mingyuan Zhou, Shengquan Mu, Chongxu Fang, Xuqiang Wu, Cheng Zuo, Shili Li
Summary: This paper proposes an improved algorithm that uses fast Fourier transform (FFT) to eliminate carrier phase delay in fiber optic interferometer sensors in real-time. The algorithm improves the accuracy and stability of demodulation and expands the application range.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Chuanju Hu, Changning Liu, Chao Jiang, Simei Sun
Summary: This work proposes and prepares a high-sensitive fiber optic gas pressure sensor based on the first harmonic vernier effect (FHVE). The sensor has two parallel Fabry-Perot interferometers (FPI) made of single-mode fibers and capillary tubes. The end face of the sensing cavity is cut with a femtosecond laser pulse to enhance gas pressure sensitivity. The sensor achieves a high gas pressure sensitivity and is temperature insensitive, making it suitable for monitoring pressure in extreme conditions.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Fan Yang, Chenglin Bai, Xinyu Chi, Ruohui Zhang, Qi Qi, Zukai Sun, Hengying Xu, Lishan Yang, Wanxiang Bi, Yu Zhang
Summary: In this paper, a novel joint monitoring scheme utilizing Hough transform images combined with multi-task residual neural network is proposed for elastic optical network (EON). The scheme can simultaneously achieve monitoring and estimation of multiple parameters. By optimizing the skip connections, the issue of information loss caused by impaired optical signals is effectively resolved. Experimental results demonstrate excellent performance and tolerance of the scheme.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Tetsushi Matsuda, Satoshi Kitaoka, Kenji Nakahira, Taishi Ito, Takeharu Kato, Junzo Kasahara
Summary: DFOS devices deployed in geothermal boreholes require optical fibers that can withstand high temperatures and understanding the deterioration behavior at these temperatures is crucial for predicting device lifetimes.
OPTICAL FIBER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Punithavathi M. Thirunavakkarasu, Abdul Ali Khan, Ahmad Shukri Muhammad Noor, Norazlina bte Saidin, Nawaf Waqas
Summary: There has been a growing demand for reliable ethanol sensors in the pharmaceutical and food industries. This study introduces a new fiber optic sensor coated with gold to improve its sensitivity and uses Surface Plasmon Resonance (SPR). The sensor's performance was evaluated by analyzing wavelength shifts caused by varying ethanol concentration.
OPTICAL FIBER TECHNOLOGY
(2024)
