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Rapid online analysis of trace elements in steel using a mobile fiber-optic laser-induced breakdown spectroscopy system

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Plasma Science and Technology 2020年第7期22卷 98-104页

作者： Qingdong ZENG Guanghui CHEN Xiangang CHEN Boyun WANG Boyang WAN Mengtian YUAN Yang LIU Huaqing YU Lianbo GUO Xiangyou LI School of Physics and Electronic-information Engineering Hubei Engineering UniversityXiaogan 432000People’s Republic of China Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Faculty of Physics and Electronic Science Hubei UniversityWuhan 430062People's Republic of China Inner Mongolia North Heavy Industries Group Corp.Ltd Baotou 014033People's Republic of China

A mobile fiber-optic laser-induced breakdown spectrometer(FO-LIBS) prototype was developed to rapidly detect a large quantity of steel material online and quantitatively analyze the trace elements in a large-diameter steel ***-four standard samples and a polynomial fitting method were used to establish calibration curve *** R^2 factors of the calibration curves were all above 0.99,except for Cu,indicating the elements’ strong self-absorption *** special steel materials were rapidly detected in the steel *** average absolute errors of Mn,Cr,Ni,V,Cu,and Mo in the special steel materials were 0.039,0.440,0.033,0.057,0.003,and0.07 wt%,respectively,and their average relative errors fluctuated from 2.9% to 15.7%.The results demonstrated that the performance of this mobile FO-LIBS prototype can be compared with that of most conventional LIBS systems,but the more robust and flexible characteristics of the FO-LIBS prototype provide a feasible approach for promoting LIBS from the laboratory to the industry.

关键词： laser-induced breakdown spectroscopy optical fiber rapid analysis online detection steel

Photosensitivity Studies of Sm+2/Sm+3 Doped Aluminosilicate fiber

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光电子·激光 1996年第3期7卷 144-149页

作者： Zhu Yi-Nian (Shanghai Electric Cable Research Institute,Shanghai 200093,P.R.of China) Shanghai Electric Cable Research Inst Shanghai China

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ＰｈｏｔｏｓｅｎｓｉｔｉｖｉｔｙＳｔｕｄｉｅｓｏｆＳｍ＋２／Ｓｍ＋３ＤｏｐｅｄＡｌｕｍｉｎｏｓｉｌｉｃａｔｅＦｉｂｅｒ￥ＺｈｕＹｉ－Ｎｉａｎ（ＳｈａｎｇｈａｉＥｌｅｃｔｒｉｃＣａｂｌｅＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｓｈａｎｇｈａｉ２０００９３，...

关键词： Rare earth optical fiber Photosensitivity.

Machine Learning-Based Multi-Modal Information Perception for Soft Robotic Hands

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Tsinghua Science and Technology 2020年第2期25卷 255-269页

作者： Haiming Huang Junhao Lin Linyuan Wu Bin Fang Zhenkun Wen Fuchun Sun College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Department of Computer Science and Technology Tsinghua UniversityTsinghua UniversityBeijing 100084China College of Computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China

This paper focuses on multi-modal Information Perception(IP)for Soft Robotic Hands(SRHs)using Machine Learning(ML)algorithms.A flexible optical fiber-based Curvature Sensor(OFCS)is fabricated,consisting of a Light-Emitting Diode(LED),photosensitive detector,and optical *** the roughened optical fiber generates lower light intensity,which reflecting the curvature of the soft *** with the curvature and pressure information,multi-modal IP is performed to improve the recognition *** of gesture,object shape,size,and weight are implemented with multiple ML approaches,including the Supervised Learning Algorithms(SLAs)of K-Nearest Neighbor(KNN),Support Vector Machine(SVM),Logistic Regression(LR),and the unSupervised Learning Algorithm(un-SLA)of K-Means Clustering(KMC).Moreover,optical Sensor Information(OSI),Pressure Sensor Information(PSI),and Double-Sensor Information(DSI)are adopted to compare the recognition *** experiment results demonstrate that the proposed sensors and recognition approaches are feasible and *** recognition accuracies obtained using the above ML algorithms and three modes of sensor information are higer than 85 percent for almost all ***,DSI is more accurate when compared to single modal sensor information and the KNN algorithm with a DSI outperforms the other combinations in recognition accuracy.

关键词： multi-modal sensors optical fiber gesture recognition object recognition Soft Robotic Hands(SRHs) Machine Learning(ML)

Characteristics of the propagation of partial discharge ultrasonic signals on a transformer wall based on Sagnac interference

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Plasma Science and Technology 2020年第2期22卷 10-18页

作者： Jun JIANG Kai WANG Xuerui WU Guoming MA Chaohai ZHANG Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and AstronauticsNanjing 211106People's Republic of China Department of Electrical&Electronic Engineering School of EngineeringThe University of ManchesterManchester Ml39PLUnited Kingdom State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206People's Republic of China

The acoustic emission(AE)method has been widely recognized for the detection of incipient insulation fault phenomenon(partial discharge,PD)in power transfomiers,nevertheless,the installation and placement of AE sensors should be taken into full *** this manuscript,a three-dimensional multiphysics model was established and simulated to research the characteristics of the propagation in the transformer ***,a piezoelectric transducer was used to detect PD ultrasonic signals and verify the simulation results in the *** ensure the accuracy of the detection,an optical fiber sensor based on the Sagnac interference principle was designed and *** variation of the amplitude of the ultrasonic signal with distance reveals the characteristics of the ultrasonic signal propagating in the transformer *** distribution of sound pressure on the upper and lower surfaces of the simulation model proved that ultrasonic waves propagate in the form of symmetrical Lamb waves in the transformer ***,the amplitude of the AE attenuates due to absorption and refraction loss,and local fluctuations on account of acoustic ***,a stable signal detected by an AE sensor does not represent the absence of PD in a *** improve the reliability of AE detection,it is proposed in this manuscript that repeated movement of the AE sensor is necessary to obtain a suitable measurement ***,it is necessary to adjust the position of the AE sensor in order to locate the PD source *** addition,this study is expected to provide a theoretical analysis and a fiber sensor to address the problem of sensor placement in AE detection.

关键词： partial discharge power transformer ultrasonic detection optical fiber Sagnac interference

Enhancement of multiple four-wave mixing via cascaded fibers with discrete dispersion decreasing

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Chinese Physics B 2017年第6期26卷 165-169页

作者：李嘉宝孔令杰肖晓晟杨昌喜 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing 100084 China

Cascaded fiber geometry with the dispersion of each fiber decreasing is proposed to enhance the multiple four-wave mixing（FWM） generation. The first fiber with relatively large dispersion initiates and accelerates the expansion of multiple FWM, and the second fiber with small dispersion would allow the phase-matching process（thus the spectrum broadening）to keep going. Numerical and experimental results show that with this geometry not only multiple FWM expansion can be accelerated, but also the efficiency of multiple FWM products can be effectively improved with shorter fibers.

关键词： four-wave mixing optical fiber cascaded process

An Ultra-Broadband Single-Polarization Single-Mode Photonic Crystal Fibre

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Chinese Physics Letters 2005年第9期22卷 2302-2304页

作者：娄淑琴简伟任国斌简水生 Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044

An ultra broadband single-polarization single-mode （SPSM） photonic crystal fibre （PCF） is proposed and analysed by using the plane-wave expansion method and the beam propagation method. Numerical results demonstrate that the SPSM wavelength region nearly at 580 nm in width from 1. 461μm to 2.041μm is obtained in this PCF. The start wavelength of the SPSM region is close to the hole pitch, and the width of the SPSM region increases with the increasing hole pitch. Effects of dopant concentration on SPSM properties are investigated. The confinement loss decreases and the width of SPSM region widens slightly with the increasing dopant concentration. These results offer a new possibility of fabricating active doped SPSM PCFs with high performance that is crucial for improving the performance of linearly polarized fibre lasers.

关键词： optical fiber OPERATION

Engineering steady-state entanglement for two atoms held in separate cavities through laser cooling

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Chinese Physics B 2014年第4期23卷 109-112页

作者：沈利托陈荣鑫吴怀志杨贞标 Laboratory of Quantum Optics Department of Physics Fuzhou University

We propose a scheme to prepare the steady-state entanglement for two atoms, which are held in separate cavities that are coupled through a short optical fiber or optical resonator. The entangled steady-state with a high fidelity can be achieved even with a low cooperativity parameter, by making use of the driving laser fields. Such a cooling mechanism is based on a resonant laser pump of the unwanted ground states to the excited states, which finally decay to the desired steady-state.

关键词： laser cooling steady-state entanglement optical fiber

On-line Monitoring of Epoxy Resin Exposed to Acid Solution

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Journal of Materials Science & Technology 2006年第3期22卷 414-418页

作者： Yuyan LIU M.Ku bouchi H.Semboku ya K. Tsuda T. Tomiyama Harbin Institute of Technology Harbin 150001 China Tokyo Institute of Technology Tokyo Japan Public Works Research Institute Ibaraki Japan

In this study, a new on-line health monitoring technology for the determination of the penetration of environment solution into epoxy resin was pursued. A corrosion sensor including plastic optical fiber and pH indicator was fabricated. The color-change layer of this sensor appeared after immersion in sulfuric acid solution, which could be examined by using optical fiber and spectrophotometer. The results showed that the penetration of sulfuric acid was detected by adding bromophenol blue （BPB） in the corrosion sensor. This system could be applied to on-line health monitoring of chemical equipment structures.

关键词： Epoxy resin optical fiber Corrosion monitor

Long-term fiber Photometry for Neuroscience Studies

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Neuroscience Bulletin 2019年第3期35卷 425-433页

作者： Yi Li Zhixiang Liu Qingchun Guo Minmin Luo National Institute of Biological Sciences Beijing 102206China Thinker Tech Nanjing Biotech Limited Co. Nanjing 210019China School of Life Sciences Tsinghua UniversityBeijing 100084China

fiber photometry is a sensitive and easy way to detect changes in fluorescent signals. The combination of fiber photometry with various fluorescent biomarkers has substantially advanced neuroscience research over the last decade. Despite the wide use of fiber photometry in biomedical fields, the lack of a detailed and comprehensive protocol has limited progress and sometimes complicated the interpretation of data. Here, we describe detailed procedures of fiber photometry for the long-term monitoring of neuronal activity in freely-behaving animals, including surgery, apparatus setup, data collection, and analysis.

关键词： Ca^(2+) signal Fluorescence detection Ca^(2+) indicator optical fiber Experiment protocol