Correction of measurement results from the dynamic characteristics of measuring systems

1967 ◽  
Vol 10 (9) ◽  
pp. 1035-1038
Author(s):  
O. N. Tikhonov
Keyword(s):  
Dynamic Characteristics ◽  
Measuring Systems ◽  
Measurement Results

Commutability assessment of reference materials for the enumeration of lymphocyte subsets

2019 ◽  
Vol 57 (5) ◽  
pp. 697-706 ◽  
Author(s):  
Chenbin Li ◽  
Mingting Peng ◽  
Dongsheng Xu ◽  
Hong Lu ◽  
Wenbin Zhou ◽  
...  
Keyword(s):  
Reference Materials ◽  
Lymphocyte Subsets ◽  
Measuring Systems ◽  
Cd4 Cell Count ◽  
Significant Difference ◽  
Measurement Results ◽  
Regression Approach ◽  
The Difference ◽  
And Performance ◽  
Cd4 Cell

Abstract Background Flow cytometric enumeration of lymphocyte subsets in peripheral blood can provide important information about immune status. Commutable reference materials (RM) are crucial for maintaining accurate and comparable measurement results over time and space. Commutability assessment of RMs for lymphocyte subsets enumeration has not been reported elsewhere. Methods Lymphocyte subsets were measured in triplicate on 56 patient samples and eight RMs using two measuring systems commonly used in laboratories (FACS Canto II and Cytomics FC500). The first step was to determine the suitability of RMs and comparability of different systems with patient samples. After the requirements of suitability and comparability were met, the second step was to assess commutability following regression approach and difference in bias approach. Results Two RMs were not measurable on FC500 system for CD3-CD16/56+ and CD3-CD19+ percentages. The results of comparability showed no significant difference in the two systems. Eight RMs for CD3+CD4+ cell count, six RMs for CD3+ and CD3+CD8+ percentages, five RMs for CD3-CD16/56+ percentage, and three RMs for CD3-CD19+ percentage were commutable using the two approaches. For CD3+, CD3+CD8+ and CD3-CD19+ percentages, the results of regression approach showed that one RM was non-commutable for each parameter, while the other approach showed that the RM was commutable. Conclusions The suitability of RM and comparability of different measuring systems are prerequisites for assessing commutability. This study indicated that different approaches led to different results. The difference in bias approach is recommended for criteria relating to medical requirements and performance characteristics of measuring systems in use.

scholarly journals A Method for Measuring the Radiation Pattern of UHF RFID Transponders

2016 ◽  
Vol 23 (2) ◽  
pp. 163-172 ◽  
Author(s):  
Piotr Jankowski-Mihułowicz ◽  
Mariusz Węglarski
Keyword(s):  
Radiation Pattern ◽  
Classical Theory ◽  
Communication Systems ◽  
Scientific Literature ◽  
System Implementation ◽  
Uhf Rfid ◽  
Radio Communication ◽  
Measuring Systems ◽  
Measurement Results ◽  
Rfid Antennas

AbstractThe operating principles of RFID antennas should be considered differently than it is applied in the classical theory of radio communication systems. The procedure of measuring the radiation pattern of antennas that could be applied to RFID transponders operating in the UHF band is seldom discussed correctly in the scientific literature. The problem consists in the variability of the RFID chip impedance that strongly influences measurement results. The authors propose the proper methodology for determining the radiation pattern with respect to an individual transponder as well as an electronically tagged object. The advantage of the solution consists in the possibility of using components of different measuring systems that are available in typical antenna laboratories. The proposed procedure is particularly important in terms of parameter validation - the identification efficiency and costs of an RFID system implementation can be evaluated properly only on the basis of real values of considered parameters.

scholarly journals AMBIENT MEASUREMENT RESULTS AND DYNAMIC CHARACTERISTICS OF TRUSS TOWER SUPPORTED STEEL CHIMNEYS BY TYPHOON 1721

2018 ◽  
Vol 24 (58) ◽  
pp. 985-988
Author(s):  
Keisuke MIURA ◽  
Mitsugu MASHIMO ◽  
Genichi MAESHIRO ◽  
Minoru OGIHARA ◽  
Naoya HIROTANI ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Measurement Results

scholarly journals Comparison of measurement using optical measuring systems and coordinate measuring machine

2020 ◽  
Vol 26 (2) ◽  
pp. 35-41
Author(s):  
Milan Simonović ◽  
Dragan Lazarević ◽  
Marko Simonović ◽  
Bogdan Nedić
Keyword(s):  
Coordinate Measuring Machine ◽  
Complex Configuration ◽  
Measuring System ◽  
Measuring Systems ◽  
Measurement Result ◽  
Optical Measuring ◽  
Measurement Results ◽  
Final Measurement ◽  
Measuring Machine ◽  
The Way

The paper presents the results of measuring the gearbox housing with the ATOS optical measuring system, the TRITOP system and the "TESA micro-hit 4-5-4" coordinate measuring machine. The aim of the study was to determine the differences in modern measuring systems and whether these differences affect the final measurement result when controlling parts of a complex configuration. At the beginning of the paper, the way of functioning of the used measuring systems and the results of research in this area are described. GOM Inspect software used for the ATOS and TRITOP measuring systems, while PC DMIS software used for the coordinate measuring machine. The analysis of the obtained results showed that there are significant differences in the measurement results and that the measuring systems used can't be applied with the same success to the measurement of parts of complex configuration such as the gearbox housing.

scholarly journals Susceptibility of SPG parameters to the environment conditions and the method of acquisition of cloud of points with optical measuring systems applied

Mechanik ◽  
2017 ◽  
Vol 90 (8-9) ◽  
pp. 748-752 ◽  
Author(s):  
Emilia Bachtiak-Radka ◽  
Sara Dudzińska ◽  
Daniel Grochała ◽  
Stefan Berczyński
Keyword(s):  
Research Work ◽  
Digital Processing ◽  
Ambient Conditions ◽  
Anova Analysis ◽  
Measuring Systems ◽  
Scientific Research Work ◽  
Measurement Results ◽  
Repeatability And Reproducibility ◽  
Cloud Of Points ◽  
Determine Effect

Digital processing of a point cloud as measured on a concurrently produced surface would offer many opportunities for the operator to plan metrological process and to give more freedom to assess geometric structure (SGP) of the surface. SGP parameters when estimated in specific (non-standard) conditions could be difficult to validate. Non-repeatability of measurement results can often be the reason for escalation of quality problems in today's industry and can arise doubts about reliability of scientific research work. Presented by the authors in the article are the results of studies on how the SGP measurements, when carried out by means of devices based on chromatic confocal microscopy, could be distorted by ambient conditions and by the selected parameter settings. It was ANOVA analysis of variance used to determine effect of interaction of the selected parameters during acquisition and digital processing of the measured cloud of points. Which in practice is related to the repeatability and reproducibility of the parameters values as most frequently used in the assessment of SGP status.

An Analysis of the Dynamic Characteristics of a Force Plate

1972 ◽  
Vol 5 (3) ◽  
pp. 102-106 ◽  
Author(s):  
J P Marsden ◽  
S R Montgomery
Keyword(s):  
Dynamic Characteristics ◽  
Ground Reaction Force ◽  
Total Mass ◽  
Damping Ratio ◽  
Reaction Force ◽  
Force Plate ◽  
The Body ◽  
Measuring Systems ◽  
Future Design ◽  
Plate System

Experiments have been performed in which the ground reaction force during walking has been measured simultaneously by two different means; a shoe having a spring-loaded heel and fitted with a transducer was worn by subjects walking over a force plate. Discrepancies in the two sets of results led to an analysis of the dynamic characteristics of the force plate which was facilitated by comparing the results of the two measuring systems. The increase in the total mass of the system as the body lands on the plate reduces both the damping ratio and the natural frequency of the force plate system, causing an increase in the dynamic magnification. These effects are analysed quantitatively and recommendations are made for the future design of force plate systems.

scholarly journals Ensuring the validity of the results of calibrations and tests by statistical methods

2021 ◽  
pp. 8-14
Author(s):  
Alexander Kolbasin
Keyword(s):  
Statistical Methods ◽  
Random Processes ◽  
Point Of View ◽  
Test Results ◽  
Measuring Process ◽  
Intermediate Precision ◽  
Poincaré Plot ◽  
Measuring Systems ◽  
Measurement Results ◽  
Iso 5725

According to the requirements of ISO/IEC 17025:2017, the validity of test and calibration results is ensured, inter alia, by intralaboratory check of the results obtained. In this case, it is preferable to use statistical methods. The ISO 5725 standards define a number of such methods, but the choice of specific methods is left to the laboratory, taking into account the requirements for the adequacy of the effort, resources and time for the purposes of the work performed and the risks of obtaining inappropriate results. In this case, the laboratory itself must in a certain way determine which objects of calibrations (tests) should be predominantly used in checks and what frequency of checks should be foreseen. In connection with the increase in the accuracy and complexity of measuring systems, the need to apply the methods of the theory of random processes becomes more and more obvious. It is shown that the use of the Poincaré plot makes it possible to comprehensively, effectively and visually evaluate changes in the measuring process from the point of view of the dynamics of the obtained measurement results. The results of the check, in particular, the intermediate precision, make it possible to obtain a more realistic evaluation of measurement uncertainty in accordance with ISO 21748. The paper analyses some practical approaches (of varying degrees of complexity) to intralaboratory checks of the validity of calibration (test) results.

scholarly journals Influence of Thermal Phenomena on the Characteristics of Selected Electronics Networks

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4750
Author(s):  
Krzysztof Górecki ◽  
Janusz Zarębski ◽  
Paweł Górecki
Keyword(s):  
Dynamic Characteristics ◽  
Semiconductor Devices ◽  
Bipolar Transistors ◽  
Insulated Gate Bipolar Transistors ◽  
Self Heating ◽  
Cooling Conditions ◽  
Measurement Results ◽  
Calculation Results ◽  
Thermal Phenomena

This paper presents the results of investigations on the influence of thermal phenomena—self-heating in semiconductor devices and mutual thermal couplings between them—on the characteristics of selected electronics networks containing bipolar transistors (BJTs) or insulated gate bipolar transistors (IGBTs). Using the authors’ compact electrothermal models of the transistors mentioned above, the non-isothermal DC and dynamic characteristics of these devices and selected networks with these devices are calculated. Their selected characteristics are compared with the measurement results. The waveforms of currents in the considered networks are also determined taking into account thermal phenomena. Discrepancies between the obtained calculation and measurement results and the calculation results obtained without thermal phenomena are indicated. In particular, attention is paid to cooling conditions at which the networks under consideration may be damaged due to thermal phenomena.

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