A pair of parallel differential magnetic‐field probes with high measurement accuracy and high electric‐field suppression ratio

2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Yu‐Xu Liu ◽  
Xiao‐Chun Li ◽  
Zhi‐He Peng ◽  
Xin He ◽  
Jun‐Fa Mao
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Suppression Ratio ◽  
Measurement Accuracy ◽  
High Electric Field ◽  
High Measurement ◽  
Field Suppression ◽  
High Measurement Accuracy

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.

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