Photonic Sensors

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Optical fiber grating vibration sensor for vibration monitoring of hydraulic pump
Photonic Sensors - Tập 7 - Trang 140-147 - 2017
Zhengyi Zhang, Chuntong Liu, Hongcai Li, Zhenxin He, Xiaofeng Zhao
In view of the existing electrical vibration monitoring traditional hydraulic pump vibration sensor, the high false alarm rate is susceptible to electromagnetic interference and is not easy to achieve long-term reliable monitoring, based on the design of a beam of the uniform strength structure of the fiber Bragg grating (FBG) vibration sensor. In this paper, based on the analysis of the vibration...... hiện toàn bộ
Wide absorption spectrum measuring methods by DFB-LDs in water vapor detection system
Photonic Sensors - Tập 4 - Trang 230-235 - 2013
Y. N. Liu, J. Chang, J. Lian, Q. Wang, G. P. Lv, W. J. Wang, Z. Liu, X. Z. Liu, S. S. Zhang, Z. L. Wang, S. Jiang, C. G. Zhu, W. Wei, B. N. Sun
Two measuring methods of the wide absorption spectrum by distributed feedback laser diodes (DFB-LDs) are presented in detecting the water vapor absorption line. One is the subsection scanning method, and it takes advantage of the wide spectrum tuning range by the temperature modulation and fast spectrum tuning speed by current modulation. Specifically, this method is realized by dividing a target ...... hiện toàn bộ
Study on influence of crack on the blade status using FBGs
Photonic Sensors - Tập 8 - Trang 63-69 - 2017
Gang Xu, Lei Liang, Jianzhi Li, Huaping Mei, Hongli Li, Yijun Liu
The status detection for rotating parts is difficult since the sensor is influenced by the rotation in the inflammable, explosive, and strong magnetic environment. Based on the fiber Bragg grating sensing technology, this paper studies the influence of the natural frequency and deformation of a rotor blade affected by the size of crack in the blade. Test results show that the speed of the equipmen...... hiện toàn bộ
Crack Detection by Optical Voice Recorder Based on Digital Holography
Photonic Sensors - - 2019
Gülhan Ustabaş Kaya, Zehra Saraç
Các tiến bộ và ứng dụng mới sử dụng hiệu ứng quang âm trong sợi quang Dịch bởi AI
Photonic Sensors - Tập 3 - Trang 1-25 - 2013
Alexandre A. P. Pohl, Roberson A. Oliveira, Ricardo E. Da Silva, Carlos A. F. Marques, Paulo de Tarso Neves, Kevin Cook, John Canning, Rogério N. Nogueira
Nghiên cứu này trình bày một cái nhìn tổng quan ngắn gọn về các nghiên cứu hiện tại liên quan đến cơ chế quang âm áp dụng cho sợi quang. Vai trò của phần tử áp điện và bộ điều chế quang âm trong việc kích thích các chế độ sóng âm uốn cong và sóng âm dọc trong dải tần số lên tới 1,2 MHz được nhấn mạnh. Một sự kết hợp giữa phương pháp phần tử hữu hạn và phương pháp ma trận truyền được sử dụng để mô ...... hiện toàn bộ
#quang âm #sợi quang #bộ điều chế quang âm #lưới Bragg #lưới dài #cảm biến độ nhớt
Optical Rotation Detection for Atomic Spin Precession Using a Superluminescent Diode
Photonic Sensors - Tập 9 - Trang 135-141 - 2019
Xuejing Liu, Yang Li, Hongwei Cai, Ming Ding, Jiancheng Fang, Wei Jin
A superluminescent diode (SLD) as an alternative of laser is used to detect optical rotation for atomic spin precession. A more uniform Gauss configuration without additional beam shaping and a relatively high power of the SLD have a potential for atomic magnetometers, which is demonstrated in theory and experiments. In addition, the robustness and compactness enable a more practical way for optic...... hiện toàn bộ
Study of Ф-OTDR stability for dynamic strain measurement in piezoelectric vibration
Photonic Sensors - Tập 6 Số 3 - Trang 199-208 - 2016
Meiqi Ren, Ping Lu, Liang Chen, Xiaoyi Bao
Abstract In a phase-sensitive optical-time domain reflectometry (Φ-OTDR) system, the challenge for dynamic strain measurement lies in large intensity fluctuations from trace to trace. The intensity fluctuation caused by stochastic characteristics of Rayleigh backscattering sets detection limit for the minimum strength of vibration measurement and causes t...... hiện toàn bộ
High-Sensitivity Early Detection Biomedical Sensor for Tuberculosis With Low Losses in the Terahertz Regime Based on Photonic Crystal Fiber Technology
Photonic Sensors - Tập 13 - Trang 1-16 - 2023
Nazmi A. Mohammed, Omar E. Khedr, El-Sayed M. El-Rabaie, Ashraf A. M. Khalaf
Tuberculosis is one of the most contagious and lethal illnesses in the world, according to the World Health Organization. Tuberculosis had the leading mortality rate as a result of a single infection, ranking above HIV/AIDS. Early detection is an essential factor in patient treatment and can improve the survival rate. Detection methods should have high mobility, high accuracy, fast detection, and ...... hiện toàn bộ
Sensing properties of femtosecond laser-inscribed long period gratings in photonic crystal fiber
Photonic Sensors - Tập 1 - Trang 228-233 - 2011
Kyriacos Kalli, Tom Allsop, Kaimin Zhou, Graham Smith, Michael Komodromos, David Webb, Ian Bennion
The use of near infrared, high intensity femtosecond laser pulses for the inscription of long period fiber gratings in photonic crystal fiber is reported. The formation of grating structures in photonic crystal fiber is complicated by the fiber structure that allows wave-guidance but that impairs and scatters the femtosecond inscription beam. The effects of symmetric and asymmetric femtosecond las...... hiện toàn bộ
Parametric Analysis of NO2 Gas Sensor Based on Carbon Nanotubes
Photonic Sensors - Tập 6 - Trang 153-157 - 2016
Asama N. Naje, Russul R. Ibraheem, Fuad T. Ibrahim
Two types of carbon nanotubes [single walled nanotubes (SWCNTs) and multi walled carbon nanotubes (MWCNTs)] are deposited on porous silicon by the drop casting technique. Upon exposure to test gas mixing ratio 3% NO2, the sensitivity response results show that the SWCNTs’ sensitivity reaches to 79.8%, where MWCNTs’ is 59.6%. The study shows that sensitivity response of the films increases with an ...... hiện toàn bộ
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