Article
Physics, Multidisciplinary
Ling Liu, Xiaoyan Wu, Guodong Liu, Tigang Ning, Jian Xu, Haidong You
Summary: This article proposes and demonstrates a Michelson interferometer interrogation system based on an optoelectronic oscillator. The system shows high temperature sensitivity and interrogation resolution, enabling wavelength-to-frequency mapping.
Article
Optics
Aleksandr Markvart, Alexander Petrov, Sergei Tataurtshikov, Leonid Liokumovich, Nikolai Ushakov
Summary: This study reports on a pulse wave optical fiber sensor interrogated by a smartphone, and evaluates its performance in terms of signal to noise ratio, repeatability of demodulated signal, and suitability for extracting information about direct and reflected waves.
Article
Optics
Naihan Zhang, Muguang Wang, Beilei Wu, Mengyao Han, Jing Zhang, Yan Liu, Guofang Fan
Summary: The proposed FOCS utilizes OEO and MPF technologies to convert the magneto-optic phase shift induced by the current into a phase difference, allowing for high precision measurement. This method improves interrogation speed and accuracy significantly.
Article
Chemistry, Analytical
Churou Huang, Guoxuan Zhu, Zhiyong Bai, Jiayan Chen, Zheng Huang, Rui Liu, Luping Wu, Shen Liu, Cailing Fu, Yiping Wang
Summary: A novel optical fiber sensing technology based on intensity distribution change in orbital angular momentum (OAM) mode is proposed in this study. The technology utilizes a chiral long-period fiber grating (CLPFG) to directly excite the 1st-order OAM (OAM(1)) mode and tracks the intensity changes in the coherent superposition state between the fundamental mode and the OAM(1) mode at the non-resonant wavelength of the CLPFG to sense external parameters. When applied to temperature measurement, the intensity distribution change has a good linear relationship with temperature in the range of 30°C to 100°C. The sensitivity and resolution can be further improved by changing the area of the collected image.
Article
Engineering, Civil
Ruba A. M. Mohamed, Chris Gabrielli, John S. Selker, Frank Selker, Scott C. Brooks, Tanzila Ahmed, Kenneth C. Carroll
Summary: Measuring surface water temperature spatial variability is crucial for various purposes. FO-DTS is effective but challenging in certain stream conditions. Comparing FO-DTS with the towed transect method in East Fork Poplar Creek showed strong correlation, with differences near stream banks attributed to shallower water and lower data density. Individual temperature sensors can be a practical alternative to FO-DTS, offering slightly lower resolution but higher accuracy and simplicity.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Electrical & Electronic
Isha Sharma, Partha Roy Chaudhuri
Summary: We demonstrate precise determination of electric field and polarization properties of a sample using a fiber-optic beam deflection transducer. By designing a series of experiments, we establish a high-performance electric field sensing scheme and determine the polarization properties of the sample. Incorporating a Sagnac loop and a ring resonator design, we further enhance the sensitivity and performance of the sensor. The results show that the electric field sensor operates accurately in the range of 0-0.75 kV/cm.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Istiaque Reja, Linh Nguyen, Heike Ebendorff-Heidepriem, Stephen C. Warren-Smith
Summary: In this study, we present a multipoint optical fiber pressure sensor for high temperature operation using multimode interference. The sensor consists of several sensing elements that are connected in series and demultiplexed using Fourier analysis. Each sensing element is made of a four-hole asymmetric multimode fiber and two standard polarization-maintaining single mode fibers. The sensor can operate at temperatures up to 900 degrees C and has potential applications in heavy industry for spatially resolved pressure measurements that can improve efficiency and safety.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Danqi Feng, Ya Gao, Tao Zhu, Ming Deng, Xiaohu Zhang, Li Kai
Summary: The proposed magnetic field sensor utilizes two optoelectronic oscillators to accurately estimate magnetic field and temperature by measuring oscillation frequencies, while reducing the influence of temperature in the same environment. With a simple and compact configuration, high-speed, high-resolution measurements can be achieved, making it suitable for magnetic field sensing applications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Guangying Wang, Baoliang Liao, Yuan Cao, Xinhuan Feng, Bai Ou Guan, Jianping Yao
Summary: A high-speed and high-resolution temperature sensor based on two cascaded fiber-optic Sagnac loops interrogated using a microwave photonic method is proposed and experimentally demonstrated. The system converts the optical spectrum to the time domain for sensing information extraction, achieving a temperature resolution of 1.33 x 10(-5) degrees C at a sensing speed of 23.497 kHz.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Matej Njegovec, Vedran Budinski, Boris Macuh, Denis Donlagic
Summary: Corrosion-induced optical fiber microbending is demonstrated as an efficient method for designing sensors that can detect and locate corrosion events on metal surfaces. The proposed sensors have been successfully applied to both bare metal surfaces and surfaces covered with corrosion-protective coatings, and they possess the simplicity in design and manufacturing, reliable corrosion detection, and accurate corrosion localization.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Chemistry, Analytical
Vit Novotny, Petr Sysel, Ales Prokes, Pavel Hanak, Karel Slavicek, Jiri Prinosil
Summary: This distributed long-range sensing system uses standard telecommunication single-mode optical fiber for distributed sensing of mechanical vibrations, enabling detection, localization, and classification of various vibration sources. The system components were designed, constructed, and tested in both laboratory and real deployment scenarios, with results presented in the paper.Additionally a two-fiber sensor unit with double sensing range was designed, constructed, and initial measurement results were presented.
Article
Energy & Fuels
Anees Mohammed, Sinisa Djurovic
Summary: This article presents the use of fiber Bragg grating sensors for monitoring the bearing condition of electric machines. The proposed method allows simultaneous extraction of thermal and mechanical information for health monitoring and fault diagnosis. Experimental tests show that the in-situ sensing scheme performs well under both healthy and faulted bearing conditions.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2021)
Article
Optics
Danqi Feng, Yangxu Tang, Run Lei, Ziqing Feng, Ming Deng
Summary: This paper proposes and experimentally demonstrates a novel configuration for a polarimetric fiber ring laser incorporating a coupled optoelectronic oscillator (COEO) and studies its application to magnetic field sensing. The COEO-based polarimetric fiber ring laser consists of two mutually coupled loops: the fiber ring laser loop and the OEO loop. By applying the oscillation mode to modulate the optical loop, mode-locking can be achieved, and the birefringence variation can be estimated by measuring the oscillating frequency of the COEO. The proposed sensing system is validated by introducing a circular birefringence change in a magneto-optic crystal via the Faraday rotation effect, and magnetic field sensing is implemented.
Article
Engineering, Electrical & Electronic
Joao C. C. Araujo, Paulo S. S. dos Santos, Bernardo Dias, Jose Manuel Marques Martins de Almeida, Luis C. C. Coelho
Summary: A portable interrogation unit for optical fiber sensors was designed and fabricated using a combination of photodetector, micro-electromechanical system, and Fabry-Perot interferometer. Deconvolution techniques were applied to mitigate the effect of the filter's broadband response. The unit's performance was validated with the interrogation of long-period fiber gratings as temperature, refractive index, and humidity sensors, showing low relative errors compared to commercial alternatives.
IEEE SENSORS JOURNAL
(2023)
Article
Instruments & Instrumentation
Ting Liang, Wangwang Li, Cheng Lei, Yongwei Li, Zhiqiang Li, Jijun Xiong
Summary: This paper introduces an all-SiC fiber-optic Fabry-Perot pressure sensor based on hydrophilic direct bonding technology for use in harsh environments. The sensor demonstrates sensing capabilities for pressure range up to 800 kPa, making it suitable for high temperature environments where thermal expansion coefficient mismatch can cause sensor failure.
