scholarly journals The Evaluation of Expanded Uncertainty of DC Voltages in the Presence of Electromagnetic Interferences using the LabVIEW Environment

2021 ◽  
Vol 21 (5) ◽  
pp. 136-141
Author(s):  
Przemysław Otomański ◽  
Eligiusz Pawłowski ◽  
Anna Szlachta
Keyword(s):  
Direct Measurement ◽  
Measuring System ◽  
Measuring Instrument ◽  
Uncertainty Of Measurement ◽  
Expanded Uncertainty ◽  
System A ◽  
Data Acquisition Board ◽  
Measurement Results ◽  
Virtual Measuring Instrument ◽  
User Friendly

Abstract The paper presents a possible application of integrated LabVIEW environment to the final evaluation of measurement results in direct measurement. The possibilities of presenting and visualizing the uncertainty of measurement results in a convenient and user-friendly form are also discussed. The topics discussed in the paper were presented using a developed application in LabVIEW. The paper discusses the topic of measurement of direct voltages in the presence of strong electromagnetic interferences. These problems are frequently omitted or hardly emphasized. It presents a suitable measuring system, a virtual measuring instrument created in the LabVIEW environment, and the results of tests carried out for an example NI PCI-6221 data acquisition board. The described approach can be applied also in other measurement situations.

UNCERTAINTY OF THE MEASUREMENTS RESULTS OF THE CHEMICAL COMPOSITION AND ITS METHODS ASSESSMENT

2021 ◽  
pp. 84-91
Author(s):  
F.N. Karachevtsev ◽  
◽  
A.F. Letov ◽  
A.V. Slavin ◽  
◽  
...  
Keyword(s):  
Standard Sample ◽  
Measurement Methods ◽  
Measuring Instrument ◽  
Uncertainty Of Measurement ◽  
Expanded Uncertainty ◽  
Regulatory Documents ◽  
Measurement Results ◽  
Final Measurement ◽  
Repeatability And Reproducibility ◽  
The Difference

An explanation of the difference between the uncertainty and the error of the measurement results, which is in the approach to their assessment, is given. The standard and expanded uncertainty are estimated taking into account the uncertainty at each operation to transfer the size of a physical quantity from a standard (standard sample) to a measuring instrument and during measurements. The error is estimated based on the variance of the final measurement. Methods for evaluating the uncertainty of measurement results are given depending on regulatory documents, metrological characteristics, measurement methods, such as indicators and limits of repeatability and reproducibility.

scholarly journals Liquid Level Detection in Standard Capacity Measures with Machine Vision

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2676
Author(s):  
Gregor Bobovnik ◽  
Tim Mušič ◽  
Jože Kutin
Keyword(s):  
Machine Vision ◽  
Vision System ◽  
Liquid Level ◽  
Measuring System ◽  
Legal Metrology ◽  
System A ◽  
Measurement Results ◽  
Capacity Measure ◽  
Measuring Scale ◽  
Liquid Level Detection

Capacity measures are commonly used volume standards for testing measuring systems for liquids other than water. Manual readings from the measuring scale can often be difficult due to the location of the capacity measure or to the nature of the measured liquid. This article focuses on the automation of this procedure by using a single camera machine vision system. A camera positioned perpendicular to the transparent neck captures the image of the liquid meniscus and the measuring scale. The volume reading is determined with the user-defined software in the LabVIEW programming environment, which carries out the image preprocessing, detection of the scale marks and the liquid level, correction of lens distortion and parallax effects and final unit conversions. The realized measuring system for liquid level detection in standard capacity measures is tested and validated by comparing the automated measurement results with those taken by the operators. The results confirm the appropriateness of the presented measuring system for the field of legal metrology.

Evaluation of Measurement Uncertainty for Water Content Tests in Soil Samples

2013 ◽  
Vol 718-720 ◽  
pp. 984-988
Author(s):  
Zhi Qing Gao ◽  
Nai Qi Shen ◽  
Xu Li ◽  
Zong Yun Shu
Keyword(s):  
Measurement Uncertainty ◽  
Water Content ◽  
Measurement Accuracy ◽  
Soil Samples ◽  
Uncertainty Of Measurement ◽  
Expanded Uncertainty ◽  
Factors Affecting ◽  
Testing Conditions ◽  
Content Determination ◽  
Measurement Results

Measurement uncertainty in the water content test for soil samples is an index for evaluating the reliability of the experiment. It affects the accuracy of some parameters such as porosity and saturation, which are derived from water content. According to the requirements of the standard JJF 1059-1999 Uncertainty Evaluation and Denotation of the Measurement Results, the uncertainty for the measurement results of the water content in soil samples was evaluated. Concerning the characteristics of the water content determination in soil samples, a pail of soil sample was taken as specimen due to its relative homogeneity. The factors affecting the measurement accuracy were discussed. The result shows that the expanded uncertainty of measurement results of the water content in soil samples was 1.6% under the proposed testing conditions.

scholarly journals Derivation of sonograph quality parameters by the use of Point Spread Function analysis

2007 ◽  
pp. S69-S76
Author(s):  
L Doležal ◽  
J Mazura ◽  
J Tesařík ◽  
H Kolářová ◽  
D Korpas ◽  
...  
Keyword(s):  
Point Spread Function ◽  
Function Analysis ◽  
Side Lobe ◽  
Quality Parameters ◽  
Measuring System ◽  
System A ◽  
Point Spread ◽  
Measurement Results ◽  
Spread Function ◽  
Computer Controlled

A measuring system evaluating a Point Spread Function generated in an ultrasonographic image by scanning a spherical target was developed. The target is moved in measuring bath filled by water over scanned volume via 3D computer controlled positioning system. A video signal obtained is converted to digital form and analyzed by original software to derive various objective parameters of the imager as follows: Focal areas in both the azimuth and the elevation directions, Ultrasound scanning lines visualisation, Manufacturer preloaded TGC, Width of the scanning plane, Side lobe levels and Amplification uniformity in the azimuth direction. The method was verified by testing 18 different equipments in 282 measurements. Samples of particular measurement results in form of graphical outputs are included. Medical and physiological impacts of this approach are discussed.

Verification of the Calculation Assumptions Applied to Solutions of the Acoustic Measurements Uncertainty

2015 ◽  
Vol 39 (2) ◽  
pp. 199-202
Author(s):  
Wojciech Batko ◽  
Renata Bal
Keyword(s):  
Normal Distribution ◽  
Confidence Intervals ◽  
Uncertainty Of Measurement ◽  
Acoustic Measurements ◽  
Uncertainty In Measurement ◽  
Sound Levels ◽  
Measurement Results ◽  
Analysis Of Results ◽  
Essential Problem ◽  
Expression Of Uncertainty

Abstract The assessment of the uncertainty of measurement results, an essential problem in environmental acoustic investigations, is undertaken in the paper. An attention is drawn to the - usually omitted - problem of the verification of assumptions related to using the classic methods of the confidence intervals estimation, for the controlled measuring quantity. Especially the paper directs attention to the need of the verification of the assumption of the normal distribution of the measuring quantity set, being the base for the existing and binding procedures of the acoustic measurements assessment uncertainty. The essence of the undertaken problem concerns the binding legal and standard acts related to acoustic measurements and recommended in: 'Guide to the expression of uncertainty in measurement' (GUM) (OIML 1993), developed under the aegis of the International Bureau of Measures (BIPM). The model legitimacy of the hypothesis of the normal distribution of the measuring quantity set in acoustic measurements is discussed and supplemented by testing its likelihood on the environment acoustic results. The Jarque-Bery test based on skewness and flattening (curtosis) distribution measures was used for the analysis of results verifying the assumption. This test allows for the simultaneous analysis of the deviation from the normal distribution caused both by its skewness and flattening. The performed experiments concerned analyses of the distribution of sound levels: LD, LE, LN, LDWN, being the basic noise indicators in assessments of the environment acoustic hazards.

Research on Precision Measuring System for Motor Speed

2012 ◽  
Vol 588-589 ◽  
pp. 1103-1107
Author(s):  
Yu Hai Gu ◽  
Qiu Shi Han ◽  
Xiao Li Xu ◽  
Hai Tao Zhang
Keyword(s):  
Control Systems ◽  
Precise Measurement ◽  
Serial Communication ◽  
Measuring System ◽  
Motor Speed ◽  
Precision Measuring ◽  
Measurement Results ◽  
Improve Accuracy ◽  
Improving Accuracy ◽  
Motor Control Systems

In order to improve accuracy of measuring motor speed in precision motor control systems, a method of precise measurement of speed with CPLD is proposed, which measures the truncated parts of the measured pulse on the basis of measuring raster count pulse within the equal period, and takes them as compensation, thus improving accuracy of measuring the raster pulse. In this paper, a speed measuring formula is given. Measuring system is provided with parallel and serial communication interfaces for output of measurement results.

Pl@ntwood: A Computer-Assisted Identification Tool for 110 species of amazon trees based on wood Anatomical Features

IAWA Journal ◽  
2011 ◽  
Vol 32 (2) ◽  
pp. 221-232 ◽  
Author(s):  
Carolina Sarmiento ◽  
Pierre Détienne ◽  
Christine Heinz ◽  
Jean-François Molino ◽  
Pierre Grard ◽  
...  
Keyword(s):  
Tree Species ◽  
Tropical Species ◽  
Computer Assisted ◽  
Accurate Identification ◽  
Anatomical Features ◽  
System A ◽  
Microscopic Features ◽  
On Line ◽  
User Friendly ◽  
Identification Tool

Sustainable management and conservation of tropical trees and forests require accurate identification of tree species. Reliable, user-friendly identification tools based on macroscopic morphological features have already been developed for various tree floras. Wood anatomical features provide also a considerable amount of information that can be used for timber traceability, certification and trade control. Yet, this information is still poorly used, and only a handful of experts are able to use it for plant species identification. Here, we present an interactive, user-friendly tool based on vector graphics, illustrating 99 states of 27 wood characters from 110 Amazonian tree species belonging to 34 families. Pl@ntWood is a graphical identification tool based on the IDAO system, a multimedia approach to plant identification. Wood anatomical characters were selected from the IAWA list of microscopic features for hardwood identification, which will enable us to easily extend this work to a larger number of species. A stand-alone application has been developed and an on-line version will be delivered in the near future. Besides allowing non-specialists to identify plants in a user-friendly interface, this system can be used with different purposes such as teaching, conservation, management, and selftraining in the wood anatomy of tropical species.

Tire-Road Friction Measuring System — A Second Generation

1968 ◽  
Author(s):  
Gary L. Goodenow ◽  
Thomas R. Kolhoff ◽  
Fraser D. Smithson
Keyword(s):  
Second Generation ◽  
Measuring System ◽  
System A ◽  
Road Friction

Estimation of uncertainty in olfactometry

2009 ◽  
Vol 59 (7) ◽  
pp. 1409-1413 ◽  
Author(s):  
T. Higuchi
Keyword(s):  
Measurement Uncertainty ◽  
Interlaboratory Comparison ◽  
Collaborative Study ◽  
Estimation Procedure ◽  
Measurement Model ◽  
Standard Uncertainty ◽  
Expanded Uncertainty ◽  
Collaborative Test ◽  
Measurement Results ◽  
Estimation Of Uncertainty

Estimation of uncertainty in odour measurement is essential to the interpretation of the measurement results. The fundamental procedure for the estimation of measurement uncertainty comprises the specification of the measurement process, expression of the measurement model and all influences, evaluation of the standard uncertainty of each component, calculation of the combined standard uncertainty, determination of a coverage factor, calculation of the expanded uncertainty and reporting. Collaborative study such as interlaboratory comparison of olfactometry yields performance indicators of the measurement method including repeatability and reproducibility. Therefore, the use of collaborative test results for measurement uncertainty estimation according to ISO/TS 21748 and ISO 20988 is effective and reasonable. Measurement uncertainty of the triangular odour bag method was estimated using interlaboratory comparison data from 2003 to 2007 on the basis of the simplest model of statistical analysis, and the expanded uncertainty of odour index ranged between 3.1 and 6.7. On the basis of the establishment of the estimation procedure for uncertainty, a coherent interpretation method for the measurement results will be proposed and more effective and practical quality control of olfactometry will be available.

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