Experimental characteristics and measurement accuracy evaluation of space cryogenic absolute radiometric primary benchmark

2021 ◽  
Vol 29 (1) ◽  
pp. 10-20
Author(s):  
Xiao-long YI ◽  
◽  
Wei FANG ◽  
Yan-dong LIN ◽  
Yu-peng WANG ◽  
...  
Keyword(s):  
Measurement Accuracy ◽  
Accuracy Evaluation

Cooperative measurement accuracy evaluation method and software

2021 ◽  
Author(s):  
Yu Ren ◽  
Feng Zhang ◽  
Fangfang Liu ◽  
Xiaolei Hu ◽  
Changyu Long ◽  
...  
Keyword(s):  
Measurement Accuracy ◽  
Evaluation Method ◽  
Accuracy Evaluation

scholarly journals Measurement of Overflow Density in Spiral Classifiers Using a Vibrating Fork Densitometer with Accuracy Evaluation

2016 ◽  
Vol 3 (1) ◽  
pp. 10
Author(s):  
Sidney Viana
Keyword(s):  
Suspended Solids ◽  
Measurement Accuracy ◽  
Density Measurement ◽  
Field Testing ◽  
Accuracy Evaluation ◽  
Dilution Water ◽  
Spiral Classifier ◽  
Bench Testing ◽  
Standard Instrumentation ◽  
Proper Performance

This work concerns the application of a vibrating fork densitometer to the measurement of overflow density in spiral classifiers. A spiral classifier is a mineral processing equipment which receives an ore slurry input and performs a gravity separation process between the solids particles of ore and the water. The classifier has two outputs: the “underflow”, formed by sedimented coarse solids; and the “overflow”, in the form of an ore slurry with fine suspended solids particles. For proper performance of a spiral classifier, the density of its overflow needs to be controlled by a feeding of dilution water at the input of the classifier. Even in present days, this control is still performed manually from manual samples of the overflow density, due to the lack of a standard instrumentation solution for this application. In this context, this work describes the application of a vibrating fork densitometer for overflow density measurement in spiral classifiers. The instrument performance was evaluated in two steps: a bench testing and a field testing. In both cases, its measurement accuracy was statistically investigated. The results obtained indicated the feasibility of the instrument for the intended application.

Measurement Accuracy Evaluation of Power Quality Online Monitoring Device Based on LSTM

2021 ◽  
Author(s):  
Qing Li ◽  
Xinyan Zhang ◽  
Yi Li ◽  
Chunlei Jiao ◽  
Bing Hou ◽  
...  
Keyword(s):  
Power Quality ◽  
Measurement Accuracy ◽  
Online Monitoring ◽  
Accuracy Evaluation ◽  
Monitoring Device

Angle measurement accuracy evaluation of rotating laser measuring system based on instantaneous rotation speed

2020 ◽  
Vol 28 (11) ◽  
pp. 2403-2410
Author(s):  
Yong-jie REN ◽  
◽  
Yun-chao JIN ◽  
Tong-chuang GUO ◽  
Jia-rui LIN
Keyword(s):  
Measurement Accuracy ◽  
Rotation Speed ◽  
Angle Measurement ◽  
Measuring System ◽  
Accuracy Evaluation

Methods for Restricting Maximum Exposure Rate in Computerized Adaptative Testing

Methodology ◽  
2007 ◽  
Vol 3 (1) ◽  
pp. 14-23 ◽  
Author(s):  
Juan Ramon Barrada ◽  
Julio Olea ◽  
Vicente Ponsoda
Keyword(s):  
Measurement Accuracy ◽  
Computerized Adaptive Testing ◽  
Computation Time ◽  
Adaptive Testing ◽  
Exposure Rate ◽  
Control Parameters ◽  
The Impact ◽  
Two Alternatives ◽  
Selection Of ◽  
Maximum Exposure

Abstract. The Sympson-Hetter (1985) method provides a means of controlling maximum exposure rate of items in Computerized Adaptive Testing. Through a series of simulations, control parameters are set that mark the probability of administration of an item on being selected. This method presents two main problems: it requires a long computation time for calculating the parameters and the maximum exposure rate is slightly above the fixed limit. Van der Linden (2003) presented two alternatives which appear to solve both of the problems. The impact of these methods in the measurement accuracy has not been tested yet. We show how these methods over-restrict the exposure of some highly discriminating items and, thus, the accuracy is decreased. It also shown that, when the desired maximum exposure rate is near the minimum possible value, these methods offer an empirical maximum exposure rate clearly above the goal. A new method, based on the initial estimation of the probability of administration and the probability of selection of the items with the restricted method ( Revuelta & Ponsoda, 1998 ), is presented in this paper. It can be used with the Sympson-Hetter method and with the two van der Linden's methods. This option, when used with Sympson-Hetter, speeds the convergence of the control parameters without decreasing the accuracy.

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

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