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检索条件"任意字段=Conference on Advanced Sensor Systems and Applications VII"

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A refractive index sensor based on taper Michelson interferometer in multimode fiber 7

A refractive index sensor based on taper Michelson interfero...

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conference on advanced sensor systems and applications vii

作者： Fu, Xinghu Zhang, Jiangpeng Wang, Siwen Fu, Guangwei Liu, Qiang Jin, Wa Bi, Weihong Yanshan Univ Key Lab Special Fiber & Fiber Sensor Hebei Prov Sch Informat Sci & Engn Qinhuangdao 066004 Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

A refractive index sensor based on taper Michelson interferometer in multimode fiber is proposed. The Hydrofluoric acid corrosion processing is studied in the preparation of single cone multimode optical fiber sensor. The taper Michelson interferometer is fabricated by changing corrosion time. The relationship between fiber sensor feature and corrosion time is analyzed. The experimental results show that the interference spectrum shift in the direction of short wave with the increase of the refractive index. The refractive index sensitivity can reach 115.8008 nm/RIU. Thereby, it can be used in detecting the refractive index in different areas including the environmental protection, health care and food production.

关键词： Refractive index Michelson interferometer multimode fiber taper fiber

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Achieving miniature sensor systems via advanced packaging techniques

Achieving miniature sensor systems via advanced packaging te...

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conference on Unattended Ground sensor Technologies and applications vii

作者： Hartup, DC Bobier, K Demmin, J Nova Engn Cincinnati OH 45246 USA

ISBN: (纸本)0819457817

Demands for miniaturized networked sensors that can be deployed in large quantities dictate that the packages be small and cost effective. In order to accomplish these objectives, system developers generally apply advanced packaging techniques to proven systems. A partnership of Nova Engineering and Tessera begins with a baseline of Nova's Unattended Ground sensors (UGS) technology and utilizes Tessera's three-dimensional (3D) Chip-Scale Packaging (CSP), Multi-Chip Packaging (MCP), and System-in-Package (SIP) innovations to enable novel methods for fabricating compact, vertically integrated sensors utilizing digital, RF, and micro-electromechanical systems (MEMS) devices. These technologies, applied to a variety of sensors and integrated radio architectures, enable diverse multi-modal sensing networks with wireless communication capabilities. sensors including imaging, accelerometers, acoustical, inertial measurement units, and gas and pressure sensors can be utilized. The greatest challenge to high density, multimodal sensor networks is the ability to test each component prior to integration, commonly called Known Good Die (KGD) testing. In addition, the mix of multi-sourcing and high technology magnifies the challenge of testing at the die level. Utilizing Tessera proprietary CSP, MCP, and SIP interconnection methods enables fully testable, low profile stacking to create multi-modal sensor radios with high yield.

关键词： sensor systems miniaturization packaging system-in-package SIP

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Photonic crystal fiber sensor based on surface-enhanced Raman scattering for explosives detection 7

Photonic crystal fiber sensor based on surface-enhanced Rama...

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conference on advanced sensor systems and applications vii

作者： Tao, Chuanyi Chen, Rong Li, Jingke Chongqing Univ Technol Dept Appl Phys Chongqing 400054 Peoples R China Chongqing Med & Pharmaceut Coll Dept Pharm Chongqing 400030 Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

We report an new approach of integrating photonic crystal fiber (PCF) SERS sensors to a Raman spectrometer for high sensitivity to the explosive 2,4,6-trinitrotoluene (TNT). The PCF SERS probe can be fabricated by using gold nanoparticles immobilized on the inner surface of air channels in a PCF through polymer-mediated self-assembly. To study the response of above fabricated substrates to the TNT vapor, the PCF SERS probe integrated with a Raman spectrometer was proposed and demonstrated in this study. The TNT-induced SERS signals are measured and the sensing capability of the proposed sensors is investigated experimentally.

关键词： Explosive detection photonic crystal fiber surface-enhanced Raman scattering sensor Raman spectrometer

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Positioning Accuracy Enhanced Distributed Disturbance Fiber Sensing System Employing Modified TDE Algorithm 7

Positioning Accuracy Enhanced Distributed Disturbance Fiber ...

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conference on advanced sensor systems and applications vii

作者： Pan, Liang Liu, Tiegen Liu, Kun Jiang, Junfeng Ma, Chunyu Tianjin Univ Coll Precis Instrument & Optoelect Engn Key Lab Optoelect Informat Technol Tianjin 300072 Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

A novel method to enhance the positioning resolution of distributed disturbance fiber sensor is proposed in this paper. The proposed scheme combines a high speed data acquisition system and a modified time delay estimate algorithm. The sensor performance is significantly improved by eliminating the impact of fluctuation of the interference signal generated by the environment disturbance. Theoretical analysis shows that with the proposed spatial resolution enhanced method, the disturbance sensing system is more suitable for various environments and provides low uncertainty in long term operation with meter-scale spatial resolution. Compared with the traditional time delay estimate method in distributed disturbance sensing system based on the criterion of spatial resolution, the positioning error of the sensor using our proposed method has been reduced at least an order of magnitude.

关键词： dual Mach-Zehnder interferometer disturbance sensor time delay estimation positioning resolution

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Fiber Bragg grating-based temperature sensor for neutral gas in capacitively coupled plasmas 7

Fiber Bragg grating-based temperature sensor for neutral gas...

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conference on advanced sensor systems and applications vii

作者： Liu, Zigeng Han, Daoman Zhang, Xinpu Liu, Yongxin Peng, Wei Wang, Younian Dalian Univ Technol Sch Phys & Optoelect Technol Dalian 116024 Peoples R China Dalian Univ Technol Minist Educ Key Lab Mat Modificat Laser Ion & Electron Beams Dalian 116024 Peoples R China

ISBN: (纸本)9781510604698;9781510604704

A fiber Bragg grating (FBG) has been utilized in capacitively coupled plasmas (CCP) for thermometry of neutral gas. We studied the effects of high frequency and low frequency power on radial distribution of neutral gas temperature. The result shows that the neutral gas temperature increases with increasing high frequency power. However, the presence of low frequency power will decrease the neutral gas temperature. Particularly, we eliminated the effect of ion bombardment on temperature measurement by studying axial distribution near plasma-sheath boundary. With features of immune to electromagnetic interference, high precision, and spatial resolving power, the FBG is a commendable candidate for CCP or other radio-frequency plasmas thermometry in both laboratory and industry.

关键词： Fiber Bragg grating capacitively coupled plasmas neutral gas temperature

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Thermal sensing performance of the nested fiber ring resonator 7

Thermal sensing performance of the nested fiber ring resonat...

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conference on advanced sensor systems and applications vii

作者： Yu, Changqiu Zhang, Yundong Wu, Yongfeng Li, Hui Zhang, Tuo Yuan, Ping Harbin Inst Technol Inst Optoelect Natl Key Lab Tunable Laser Technol Harbin 150080 Peoples R China Hangzhou Dianzi Univ Ctr Integrated Spintron Devices Hangzhou 310018 Zhejiang Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

We compare the temperature sensitivity between the nested fiber ring resonator (NFRR) and the nested fiber ring resonator coupled Mach-Zehnder interferometer (NFRRCMZI). Theoretical results indicate that the temperature sensitivity of the NFRR is almost twelve times higher than that of NFRRCMZI with same parameters, hence complex MZI system can be removed and the whole sensing system will be more compatible without sacrificing the sensitivity. Taking feedback waveguide part as the sensing element in NFRR structure, the limitation of optical quality factor on sensitivity will be broken and arbitrary sensitivity can be acquired by easily setting different feedback waveguide length.

关键词： Nested ring resonator optical quality factor M-Z interferometer thermal sensing transmission intensity scheme resonator coupled interferometer temperature sensor

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Microsensors systems: Detection of a dismounted threat

MicroSensors systems: Detection of a dismounted threat

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conference on Unattended Ground sensor Technologies and applications vii

作者： Davis, B Berglund, V Falkofske, D Krantz, B Def Microelect Act Mcclellan CA 92652 USA

ISBN: (纸本)0819457817

The Micro sensor System (MSS) is a layered sensor network with the goal of detecting dismounted threats approaching high value assets. A low power unattended ground sensor network is dependant on a network protocol for efficiency in order to minimize data transmissions after network establishment. The reduction of network 'chattiness' is a primary driver for minimizing power consumption and is a factor in establishing a low probability of detection and interception. The MSS has developed a unique protocol to meet these challenges. Unattended ground sensor systems are most likely dependant on batteries for power which due to size determines the ability of the sensor to be concealed after placement. To minimize power requirements, overcome size limitations, and maintain a low system cost the MSS utilizes advanced manufacturing processes know as Fluidic Self-Assembly (TM) and Chip Scale Packaging. The type of sensing element and the ability to sense various phenomenologies (particularly magnetic) at ranges greater than a few meters limits the effectiveness of a system. The Microsensor System will overcome these limitations by deploying large numbers of low cost sensors, which is made possible by the advanced manufacturing process used in production of the sensors. The MSS program will provide unprecedented levels of real-time battlefield information which greatly enhances combat situational awareness when integrated with the existing Command, Control, Communications, Computers, Intelligence. Surveillance and Reconnaissance (C4ISR) infrastructure. This system will provide an important boost to realizing the information dominant, network-centric objective of Joint Vision 2020.

关键词： microsensor network sensor unattended sensors

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High Temperature, Harsh Environment sensors for advanced Power Generation systems 7

High Temperature, Harsh Environment Sensors for Advanced Pow...

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conference on Micro- and Nanotechnology sensors, systems, and applications vii

作者： Ohodnicki, P. R., Jr. Credle, S. Buric, M. Lewis, R. Seachman, S. Natl Energy Technol Lab Pittsburgh PA 15236 USA Carnegie Mellon Univ Mat Sci & Engn Pittsburgh PA 15213 USA Natl Energy Technol Lab Morgantown WV 26507 USA US DOE Off Fossil Energy Washington DC 20585 USA

ISBN: (纸本)9781628415834

One mission of the Crosscutting Technology Research program at the National Energy Technology Laboratory is to develop a suite of sensors and controls technologies that will ultimately increase efficiencies of existing fossil-fuel fired power plants and enable a new generation of more efficient and lower emission power generation technologies. The program seeks to accomplish this mission through soliciting, managing, and monitoring a broad range of projects both internal and external to the laboratory which span sensor material and device development, energy harvesting and wireless telemetry methodologies, and advanced controls algorithms and approaches. A particular emphasis is placed upon harsh environment sensing for compatibility with high temperature, erosive, corrosive, and highly reducing or oxidizing environments associated with large-scale centralized power generation. An overview of the full sensors and controls portfolio is presented and a selected set of current and recent research successes and on-going projects are highlighted. A more detailed emphasis will be placed on an overview of the current research thrusts and successes of the in-house sensor material and device research efforts that have been established to support the program.

关键词： sensors Environmental sensing Oxides Control systems Optical fibers Optical sensing Fiber optics sensors Gold sensor technology Metals

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Temperature insensitive measurements of displacement using fiber Bragg grating sensors 7

Temperature insensitive measurements of displacement using f...

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conference on advanced sensor systems and applications vii

作者： Yang, Shuang Li, Jun Xu, Shengming Sun, Miao Tang, Yuquan Gao, Gang Dong, Fengzhong Chinese Acad Sci Anhui Inst Opt & Fine Machine Anhui Prov Key Lab Photon Devices & Mat Hefei 230031 Peoples R China Univ Sci & Technol China Hefei 230026 Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

Optical fiber Bragg grating (FBG) displacement sensors play an important role in various areas due to the high sensitivity to displacement. However, it becomes a serious problem of FBG cross-sensitivity of temperature and displacement in applications with FBG displacement sensing. This paper presents a method of temperature insensitive measurement of displacement via using an appropriate layout of the sensor. A displacement sensor is constructed with two FBGs mounted on the opposite surface of a cantilever beam. The wavelengths of the FBGs shift with a horizontal direction displacement acting on the cantilever beam. Displacement measurement can be achieved by demodulating the wavelengths difference of the two FBGs. In this case, the difference of the two FBGs' wavelengths can be taken in order to compensate for the temperature effects. Four cantilever beams with different shapes are designed and the FBG strain distribution is quite different from each other. The deformation and strain distribution of cantilever beams are simulated by using finite element analysis, which is used to optimize the layout of the FBG displacement sensor. Experimental results show that an obvious increase in the sensitivity of this change on the displacement is obtained while temperature dependence greatly reduced. A change in the wavelength can be found with the increase of displacement from 0 to 10mm for a cantilever beam. The physical size of the FBG displacement sensor head can be adjusted to meet the need of different applications, such as structure health monitoring, smart material sensing, aerospace, etc.

关键词： Fiber optic sensor fiber Bragg grating displacement measurement temperature insensitive

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Multimode interference structures as sensing elements integrated into Mach-Zehnder interferometers in polymer foils 7

Multimode interference structures as sensing elements integr...

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conference on advanced sensor systems and applications vii

作者： Xiao, Yanfen Langenecker, Alexa Hofmann, Meike Sherman, Stanislav Gleissner, Uwe Mueller, Claas Zappe, Hans Univ Freiburg Gisela & Erwin Sick Chair Microopt Dept Microsyst Engn D-79110 Freiburg Germany Univ Freiburg Lab Mat Proc Dept Microsyst Engn D-79110 Freiburg Germany Univ Freiburg Lab Proc Technol Dept Microsyst Engn D-79110 Freiburg Germany

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

Integrated Mach-Zehnder interferometers (MZIs) based on flexible polymer materials have been demonstrated as evanescent field sensors for the detection of refractive indices and molecule concentrations. The used application of a measurement window in classical MZIs is difficult in a roll-to-roll fabrication process. We have previously demonstrated foil-based asymmetric MZIs with different widths in sensing and reference arm which do not need a measurement window. Here we present the use of a multimode interference structure (MMI) inserted into the sensing arm of the interferometer to increase the sensitivity. We consider the expected interference signal from numerical simulations and optimize the system in terms of sensitivity, dimensions and absorption losses. The fabricated MMI-MZI foils are tested experimentally to demonstrate the function of the MMI-MZI system by applying water/glucose solutions with different refractive indices.

关键词： Mach-Zehnder interferometers multimode interference structure refractive index sensors evanescent field sensor

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