scholarly journals Detection and Cooperative Communications for Deployment Sensor Networks

2021 ◽  
Vol 38 (3) ◽  
pp. 555-564
Author(s):  
Bedr-Eddine Benaissa ◽  
Fedoua Lahfa ◽  
Khatir Naima ◽  
Giulio Lorenzini ◽  
Mustafa Inc ◽  
...  
Keyword(s):  
Service Life ◽  
Standard Method ◽  
Cooperative Communications ◽  
Wireless Sensors ◽  
Measurement Accuracy ◽  
Temporal Dimension ◽  
High Measurement ◽  
Single Sensor ◽  
Spatio Temporal ◽  
High Measurement Accuracy

In a sensor network, and more specifically with a single-hop deployment policy, sensor measurements contain a lot of redundancy either in the measurement dimensions of a single sensor, or between the measurement dimensions of different sensors due to of the spatial correlation either in the temporal dimension of the measurements. The goal is to reduce this redundancy by deploying fewer sensors, while ensuring high measurement accuracy and maximizing service life. The proposed method minimizes the complexity in terms of communication and calculation and maximizes the lifetime of the network based on an aggregation and consensus system to reduce the spatio-temporal dimension of the data captured and consequently the number of sensors deployed. The results show a visible performance compared to the standard method of transmission on the free platform of the COOJA/Contiki simulator allowing to simulate network connections of wireless sensors and to interact with them.

Optic Method to Measure the Density of Gas and the Analysis on Uncertainty of Measurement

2011 ◽  
Vol 361-363 ◽  
pp. 226-231
Author(s):  
Chang Li Guo ◽  
Yan Qing Zhang
Keyword(s):  
Refractive Index ◽  
Measurement Accuracy ◽  
Uncertainty Of Measurement ◽  
Interference Theory ◽  
Interference Fringes ◽  
Air Chamber ◽  
High Measurement ◽  
Wedge Structure ◽  
High Measurement Accuracy ◽  
Optical Wedge

A optic method to measure the density of gas is put forward. That is, by using the optical Wedge structure to build air chamber and chamber for gas under test, and by measuring the differences of the optical Wedge interference fringes of the two rooms, the density of gas has been measured. The interference theory of Wedge has been theoretical analyzed, and a formula which can be used to measure the refractive index of gas is put forward, and the uncertainty of the measurement has been analyzed. The parameters of gas density, refractive index and gas thickness have been used in the formula. The results show that the method of optical Wedge interference is practical, and high measurement accuracy is achievement when the density of gas is high.

Developing passive MEMS DC/AC current sensor applicable to two-wire appliances with high measurement accuracy

2016 ◽  
Vol 120 (16) ◽  
pp. 164506 ◽  
Author(s):  
Dong F. Wang ◽  
Xiaodong Li ◽  
Weikang Xian ◽  
Huan Liu ◽  
Xin Liu
Keyword(s):  
Measurement Accuracy ◽  
Current Sensor ◽  
High Measurement ◽  
Ac Current ◽  
High Measurement Accuracy

Research on Velocity Measurement of PD Radar Based on Non-Coherent Accumulation and Waveform Analysis

2014 ◽  
Vol 513-517 ◽  
pp. 2999-3002
Author(s):  
Xu Dong Zhang ◽  
Yun Neng Yuan ◽  
Jun Wang
Keyword(s):  
Radial Velocity ◽  
Target Tracking ◽  
Velocity Measurement ◽  
Measurement Accuracy ◽  
Waveform Analysis ◽  
Radar Target ◽  
Running Time ◽  
Coherent Accumulation ◽  
High Measurement ◽  
High Measurement Accuracy

According to the process of PD radar target tracking, the radial motion of target has a significant impact on velocity measurement. Simulation shows that there is an apparent relation between radial velocity and non-coherent accumulated waveform. Based on the calculation of the entropy of non-coherent accumulated waveform, a method based on waveform entropy in velocity measurement is proposed. Experiments show that the new method can achieve high measurement accuracy, and is insensitive to velocity. At the same time, a rough estimation of velocity is used to shorten the running time.

Evaluation of the metrological characteristics of Raman analyzer of natural gas

2021 ◽  
pp. 67-71
Author(s):  
Dmitry V. Petrov ◽  
Ivan I. Matrosov ◽  
Alexey R. Zaripov ◽  
Aleksandr S. Tanichev ◽  
Matvey A. Kostenko ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Natural Gas ◽  
Measurement Accuracy ◽  
Molar Fraction ◽  
Ecological Systems ◽  
Metrological Characteristics ◽  
Gas Analyzer ◽  
High Measurement ◽  
Academy Of Sciences ◽  
High Measurement Accuracy

The advantages of the Raman spectroscopy method in comparison with gas chromatography in the analysis of the composition of natural gas are described. The metrological characteristics of a Raman gas analyzer developed at the Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences have been studied. A series of measurements were carried out on three natural gas simulators with different concentrations of components. It is shown that Raman gas analyzers are capable of providing high measurement accuracy, close to that of gas chromatographs when analyzing components with a low molar fraction (0.001–0.010 %). It is noted that when analyzing components with a molar fraction in the range of 0.01–100.00 %, the accuracy of the proposed Raman gas analyzer surpassed the accuracy of gas chromatographs.

1.55 μm All-Fiber Laser Heterodyne Detection and Data Analysis with High Measurement Accuracy of Velocity

2011 ◽  
Vol 48 (6) ◽  
pp. 060301
Author(s):  
王希涛 Wang Xitao ◽  
刘秉义 Liu Bingyi ◽  
吴松华 Wu Songhua ◽  
姚琪 Yao Qi ◽  
李志刚 Li Zhigang
Keyword(s):  
Data Analysis ◽  
Fiber Laser ◽  
Measurement Accuracy ◽  
Heterodyne Detection ◽  
High Measurement ◽  
Laser Heterodyne ◽  
High Measurement Accuracy

Research on Measure Method of Common Normal Length Variation of Bilateral Modification Gear

2012 ◽  
Vol 569 ◽  
pp. 568-571
Author(s):  
Yu Lan Wei ◽  
Qi Bo Yan ◽  
Bing Li ◽  
Hao Xu ◽  
Ying Ying Fan
Keyword(s):  
Measurement Accuracy ◽  
Length Variation ◽  
Human Intervention ◽  
Normal Length ◽  
Coordinate Measurement ◽  
Coordinate Measurement Machine ◽  
High Measurement ◽  
Tooth Number ◽  
The Common ◽  
High Measurement Accuracy

In the conditions of rationally selecting of the measure tooth number, this paper puts forward a new method to calculate the common normal length variation, which is based on coordinate measurement machine to collect the data of bilateral modification gear's outline. Firstly, the addendum modification coefficient and tangential modification coefficient are used to determine the optimum measure tooth number, and then the common normal length variation is determined according to the definition. The experiment has shown that this way has a lot of advantages, such as the intensive data of sample points, less human intervention and high measurement accuracy.

scholarly journals Metrology for Measuring Custom Periodicities on Diffraction Gratings

2021 ◽  
pp. 2150005
Author(s):  
Ningxiao Zhang ◽  
Randall McEntaffer ◽  
Ross McCurdy ◽  
Casey DeRoo
Keyword(s):  
Spatial Resolution ◽  
Measurement Accuracy ◽  
Diffraction Gratings ◽  
Optical Interferometry ◽  
Traditional Methods ◽  
High Measurement ◽  
High Measurement Accuracy

We present a new, inexpensive, bench-top method for measuring groove period over large areas with high mapping resolution and high measurement accuracy, dubbed the grating mapper for accurate period (GMAP). The GMAP has the ability to measure large groove period changes and nonparallel grooves, both of which cannot be measured via optical interferometry. In this paper, we detail the calibration and setup of the GMAP, and employ the instrument to measure three distinct gratings. Two of these measured gratings have customized groove patterns that prevent them from being measured via other traditional methods, such as optical interferometry. Our implementation of this tool achieves a spatial resolution of 0.1[Formula: see text]mm[Formula: see text][Formula: see text][Formula: see text]0.1[Formula: see text]mm and a period error of 1.7[Formula: see text]nm for a 3[Formula: see text][Formula: see text]m size groove period.

Non-Contact Vision Inspection System of Geometric Dimension Based on LabVIEW and IMAQ Vision

2011 ◽  
Vol 305 ◽  
pp. 53-56
Author(s):  
Bin Wang ◽  
Ke Zhang ◽  
Mei Liang ◽  
Wei Luo
Keyword(s):  
Image Processing ◽  
Measurement Accuracy ◽  
Geometric Dimension ◽  
Inspection System ◽  
Size Measurement ◽  
Local Enhancement ◽  
Mechanical Parts ◽  
Vision Inspection ◽  
High Measurement ◽  
High Measurement Accuracy

This paper researched on the characteristic of circle, line and area of 2-D mechanical parts. The non-contact vision inspection system is based on labVIEW and IMAQ Vision, and the main hardware include GIGE camera, image acquisition and the NI PXI-1042 platform. The system uses image processing and analysis technology, such as image filtering, smoothing processing, local enhancement and edge detection to complete the work of size measurement. According to the contrast testing results, this system has characteristics of less time-consuming, quick inspection speed and high measurement accuracy, which completely satisfies the requirements.

Error Analysis of LMS200 in Distance Measuring Application

2010 ◽  
Vol 108-111 ◽  
pp. 817-822
Author(s):  
Jin Xue Sui ◽  
Li Yang ◽  
Zhi Lin Zhu ◽  
Zhen Hua
Keyword(s):  
Measurement Accuracy ◽  
Robot Navigation ◽  
Influencing Factor ◽  
Laser Ranging ◽  
Practical Application ◽  
Detection Range ◽  
Mixed Pixel ◽  
Experimental Effect ◽  
High Measurement ◽  
High Measurement Accuracy

The laser ranging has far detection range and high measurement accuracy and so on merits, is widely applied to navigation system of the autonomous robot, but different environmental conditions have different influence on transmission of the laser, producing errors of the various degree to measurement. Proposed ranging influence research of the laser ranging LMS200 which is used in the robot navigation under the dissimilar condition, through analyzing primary factor that affect LMS200 ranging in the room and outside, and makes the experimental contrast, obtains experimental effect under environmental influencing factor, discovers reflectivity, incidence, mixed pixel and visibility and so on environmental factor which effect on practical application truly, builds the foundation for carrying on ranging application of the robot navigation.

Sign in / Sign up

Export Citation Format

Share Document