1,897,059 Hits in 8.7 sec

Multi-Directional Light Sensing Using A Rotating Sensor

Hoang Anh Dung, Nguyen Manh Cuong, Nguyen Phan Kien
2020 Advances in Science, Technology and Engineering Systems  
In many cases, the light level is not uniform and depends on the direction of the illumination source.  ...  The testing results in normal workrooms show that the rotating sensor can measure the light level in different directions and detect the direction of the main illumination source.  ...  Detecting Main Light Direction The distribution of light sources may generate an unbalance light level in the room.  ... 
doi:10.25046/aj050626 fatcat:pcdoelhpzffcjc7z4n3abi64ky

BOTDA sensor with 2-m spatial resolution over 120 km distance using bi-directional distributed Raman amplification

Marcelo A. Soto, Stefano Faralli, Mohammad Taki, Gabriele Bolognini, Fabrizio Di Pasquale
2011 21st International Conference on Optical Fiber Sensors  
In this paper we propose the use of optimized bi-directional distributed Raman amplification to enhance the operating range of Brillouin optical time-domain analysis (BOTDA) sensors.  ...  In particular by combining high-power fiber-Raman lasers and polarization-multiplexed Fabry-Pérot lasers operating at 1450 nm with low relative-intensity-noise (RIN), we demonstrate distributed sensing  ...  levels well above the nonlinear threshold in proximity of the sensing fiber end.  ... 
doi:10.1117/12.884979 fatcat:7ubkhe6dg5flxia33q2g3xewli

High-Density Distributed Crack Tip Sensing System Using Dense Ultra-Short FBG Sensors

Xin Gui, Zhengying Li, Xuelei Fu, Changjia Wang, Yiming Wang, Hongli Li, Honghai Wang
2019 Sensors  
The experimental results are consistent with the theoretical analysis, verifying the feasibility of the DUS-FBG system for high-density distributed crack tip sensing.  ...  Furthermore, the vertical-crossed layout is adopted to avoid the omission of cracks, which usually occurs in the case of the one direction layout.  ...  application of such a system for distributed crack tip sensing [25, 26] .  ... 
doi:10.3390/s19071702 fatcat:qwvi67tc4bbxdjutoc4zinrmg4

Structural Monitoring and Performance Assessment of Shield Tunnels during the Operation Period, Based on Distributed Optical-Fiber Sensors

Tao Wang, Bin Shi, Yihuan Zhu
2019 Symmetry  
In this paper, the monitoring of the proposed deformation parameters is innovatively implemented with only one sensing technology, namely distributed optical-fiber strain sensing technology.  ...  The weak parts of shield tunnels are not obvious, so it is urgently necessary to implement distributed monitoring based on an advanced sensing method.  ...  B.S. proposed the new type of distributed, long-gauge optical-fiber sensors, and revised the manuscript. Y.Z. implemented the field experiments and discussed the results.  ... 
doi:10.3390/sym11070940 fatcat:izofgxdbeff5pmajg7buld57q4

Comparison of two structural sensing approaches for active structural acoustic control

Julien P. Maillard, Chris R. Fuller
1998 Journal of the Acoustical Society of America  
The first sensing approach implements an array of accelerometers whose outputs are filtered to construct an estimate of the sound pressure radiated at given angles in the far field.  ...  A numerical study comparing the use of two structural sensing approaches for sound radiation control is performed on a baffled rectangular plate.  ...  To obtain a larger level of sound power reduction, additional far-field pressure error estimates in other directions could be included in the control system.  ... 
doi:10.1121/1.421112 fatcat:2ck7xjp7ore4zkeysgwf2gyrji

A New Game Theory-Based Algorithm for Target Coverage in Directional Sensor Networks

Elham Golrasan, Hossein Shirazi, Marzieh Varposhti, کوروش داداش تبار احمدی
2021 Journal of Information Systems and Telecommunication  
and sensing range in a distributed manner to achieve the desired coverage.  ...  One of the challenging problems in directional sensor networks is maximizing target coverage while minimizing the amount of energy consumption.  ...  The authors in [12, 13] have studied distributed systems and propose distributed learning algorithms to achieve NE in potential games.  ... 
doi:10.52547/jist.9.34.103 fatcat:c2unollgtfglvom7tqicotae3m

Condition Monitoring of Distribution Transformer using IOT

Amol A. Sonune, Shri Sant Gajanan Maharaj College of Engineering, Shegaon.
2020 International Journal of Engineering Research and  
Because of, the large number of transformer distributed over a wide area in power electric system, the data acquisition and condition monitoring is a important issue.  ...  The main aim of this system is to monitoring the distribution transformer parameter like load current, voltage, oil level and oil temperature using IOT.  ...  IOT allows objects to be sensed or controlled remotely across existing network infrastructure, creating opportunities for more direct integration of the physical world into computer base system, and resulting  ... 
doi:10.17577/ijertv9is060244 fatcat:lgldj4sgdvgl5on57gxmq75ej4

Application of sensitivity analysis for the design of six-degree-of-freedom measurement system

Jong-Ahn Kim
2001 Optical Engineering: The Journal of SPIE  
To design the measurement system, we require a theoretical analysis of performance, such as sensitivity of each sensing direction.  ...  The intensity distributions of the diffracted beams are calculated with the scalar diffraction theory and sensitivity of the measurement system is analyzed against the variations of design parameter values  ...  Acknowledgments This work was supported in part by the Brain Korea 21 Project.  ... 
doi:10.1117/1.1418714 fatcat:auweguylz5aahint2jpgeby6om

Cost effective disaggregation mechanism for the NIALM system

Shin Jae Kang, Kangsoo Shin, Rex Yang, Seung Yong Lee, Jinho Sohn
2013 International Journal of Smart Grid and Clean Energy  
However, taking more features into an account for better performance also increases the total cost of NIALM-related system. In this paper, a cost effective approach for NIALM is presented.  ...  Non-intrusive appliance load monitoring (NIALM) technology enables to detect the amount of power usage of each home appliance with single point sensing.  ...  Lastly, the intermediate sensing method, is somewhere between direct and single point sensing. In NIALM system, the total cost of a system increases as the sampling rate of data increases.  ... 
doi:10.12720/sgce.2.3.364-370 fatcat:kijpq3re4vhmzit6lns7wv5uxm

Loop topology based white light interferometric fiber optic sensor network for application of perimeter security

Libo Yuan, Yongtao Dong
2010 Photonic Sensors  
In the perimeter security sensing system, where fiber sensors are packaged in the suspended cable or buried cable, a bi-directional optical path interrogator is built by using Michelson or Mach-Zehnder  ...  One breakdown point is allowed in the sensor loop because the sensing system will still work even if the embedded sensor loop breaks somewhere.  ...  Long-gauge distributed or quasi-distributed fiber optic sensing system can be used for intruder localization.  ... 
doi:10.1007/s13320-010-0009-9 fatcat:h6yi7jdurrdwjn6e7sbz5lb3fy

Doppler micro sense and avoid radar

Ashok Gorwara, Pavlo Molchanov, Olga Asmolova, Edward M. Carapezza, Panos G. Datskos, Christos Tsamis, Leslie Laycock, Henry J. White
2015 Unmanned/Unattended Sensors and Sensor Networks XI; and Advanced Free-Space Optical Communication Techniques and Applications  
An SAA systems comprised of Doppler radar modules and an array of directional antennas that are distributed around the perimeter of the drone can cover the entire sky.  ...  Doppler radar is proposed for use in this sense and avoid system because in contrast to optical or infrared (IR) systems Doppler can work in more harsh conditions such as at dusk, and in rain and snow.  ...  This system consists of an Array of Directional Antennas (ADA) coupled to radar sensors and distributed around a drone as presented in Figures 2, 3 and 4 below.  ... 
doi:10.1117/12.2201066 fatcat:wuqjntsmbfhircwshspqojxzrq

Parametric Assay of Energy Adept Clustering Protocols for Het-Net Wireless Sensor Networks

, inter-cluster topology, type of heterogeneity, level of heterogeneity, etc. which in turn are directly proportional to Network Operational cost  ...  The sensor nodes have confined sensing, processing, and communication potentialities, due to constrained battery life, and in most of the scenarios, it is almost unfeasible to outplace the sensors during  ...  This protocol works on two main axioms as:  The time complexity of the system in the composition of the cluster is thereby signifying reduced data overhead of the system.  Two accompanying nodes cannot  ... 
doi:10.35940/ijitee.l2932.1081219 fatcat:lnwtpalalzamtpj7y7gbliaeeu

Bacterial adaptation through distributed sensing of metabolic fluxes

Oliver Kotte, Judith B Zaugg, Matthias Heinemann
2010 Molecular Systems Biology  
We show that these adaptations are enabled by an indirect recognition of carbon sources through a mechanism we termed distributed sensing of intracellular metabolic fluxes.  ...  In this paper, using a differential equation model that couples enzymatic and transcriptional regulation of E. coli's central metabolism, we show that the interplay of known interactions explains in molecular-level  ...  Acknowledgements We thank ETH Zurich for financial support within the INIT SCM project; Paul F Cook for providing the binding kinetics of IclR to DNA; Henning Schmidt for help in translating the Matlab  ... 
doi:10.1038/msb.2010.10 pmid:20212527 pmcid:PMC2858440 fatcat:bpvn626tlfgllcxl7av2agjnii

In-situ EMC testing using surface current sense wires

Mart Coenen, Tim Maas, Yili Hu, Arthur van Roermund
2010 2010 Asia-Pacific International Symposium on Electromagnetic Compatibility  
In-situ EMC testing is, for large fixed systems and installations within the scope of the European EMC Directive, not a primary requirement other than unintended RF emissions may not affect intended radio  ...  In this paper, part of an adapted in-situ measurement approach is presented which minimizes the interaction with the local EM-environment even further by using surface current sense wires.  ...  metal surface of that distributed system or installation.  ... 
doi:10.1109/apemc.2010.5475752 fatcat:3p63nxyqpnappco365wc4d2dam

Fiber optic sensors for distributed monitoring of soil and groundwater during in-situ thermal remediation

Hamid Alemohammad, Amir Azhari, Richard Liang, Christopher S. Baldwin, Gary Pickrell, Henry H. Du
2017 Fiber Optic Sensors and Applications XIV  
A network of distributed fiber optic sensors has been implemented to monitor the distribution of soil and groundwater temperature and the level of groundwater in several in-situ thermal remediation projects  ...  This paper is focused on the implementation of fiber optic sensors for monitoring of soil and groundwater during in-situ thermal remediation of contaminated sites.  ...  The sensing characteristics of FBGs arise from photo-elastic and thermo-optic properties of optical fibers [6] [7] . In this research, we have used AOMS fiber optic sensing system (Figure 2 ).  ... 
doi:10.1117/12.2270033 fatcat:alm7afxvizgrjklfdw372hwrbi
« Previous Showing results 1 — 15 out of 1,897,059 results