scholarly journals Measurement uncertainty budget of an interferometric flow velocity sensor

2017 ◽  
Author(s):  
Mike Bermuske ◽  
Lars Büttner ◽  
Jürgen Czarske
Keyword(s):  
Measurement Uncertainty ◽  
Flow Velocity ◽  
Uncertainty Budget ◽  
Velocity Sensor ◽  
Measurement Uncertainty Budget

Traceability of on-machine tool measurement: Uncertainty budget assessment on shop floor conditions

Measurement ◽  
2019 ◽  
Vol 135 ◽  
pp. 180-188 ◽  
Author(s):  
Unai Mutilba ◽  
Alejandro Sandá ◽  
Ibon Vega ◽  
Eneko Gomez-Acedo ◽  
Ion Bengoetxea ◽  
...  
Keyword(s):  
Machine Tool ◽  
Measurement Uncertainty ◽  
Uncertainty Budget ◽  
Shop Floor ◽  
Measurement Uncertainty Budget

scholarly journals A practical approach to evaluate the measurement uncertainty budget for calibration of strain gauge based high-precision carrier frequency amplifiers

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 210
Author(s):  
Marco M. Schäck
Keyword(s):  
Measurement Uncertainty ◽  
High Precision ◽  
Strain Gauge ◽  
Carrier Frequency ◽  
Uncertainty Budget ◽  
Point Of View ◽  
Precision Measurements ◽  
Frequency Method ◽  
Physical Limit ◽  
Measurement Uncertainty Budget

For high-precision measurements of strain gauge-based transducers, 225 Hz carrier frequency measuring amplifiers are primarily used. The benefits of this carrier frequency method were discussed in previous publications. This publication shows the measurement uncertainty that can be achieved by calibrating an amplifier based on this method. Possibilities for improving the measurement uncertainty and the physical limit from the user's point of view are shown.

scholarly journals Multi-component measuring device - completion, measurement uncertainty budget and signal cross-talk for combined load conditions

ACTA IMEKO ◽  
2017 ◽  
Vol 6 (4) ◽  
pp. 89
Author(s):  
Sebastian Baumgarten ◽  
Dirk Röske ◽  
Rolf Kumme
Keyword(s):  
Measurement Uncertainty ◽  
Maximum Load ◽  
Uncertainty Budget ◽  
Font Size ◽  
Simultaneous Generation ◽  
Measuring Device ◽  
Combined Loads ◽  
Axial Forces ◽  
Measurement Uncertainty Budget

<p> </p><p><span style="font-family: Calibri;"><span style="font-size: small;">This paper present the completion and the measurement uncertainty budget of a multi-component measuring facility. The new facility is part of the 1 MN force standard machine [1] of the PTB. It enables the simultaneous generation of a torque in the range from 20 N·m to 2 kN·m in addition to axial forces 20 kN to 1 MN. This allows the characterization of measuring systems which require combined loads of axial forces <em>F</em></span><sub><span style="font-size: xx-small;">z</span></sub><span style="font-size: small;"> and torques <em>M</em></span><sub><span style="font-size: xx-small;">z</span></sub><span style="font-size: small;"> like friction coefficient sensors. The aim is a measurement uncertainty of (<em>k</em> = 2) for <em>M</em></span><sub><span style="font-size: xx-small;">z</span></sub><span style="font-size: small;"> &lt; 0.01 % and <em>F</em></span><sub><span style="font-size: xx-small;">z</span></sub><span style="font-size: small;"> &lt; 0.002 %. The physical model yields to extended measurement uncertainties (<em>k</em> = 2) for 20 N·m of 5.9·10</span><sup><span style="font-size: xx-small;">-5</span></sup><span style="font-size: small;"> and for the maximum load step <span><em>M</em></span><sub><span>z</span></sub> = (2000 ± 0.084) N·m.</span></span></p><p> </p>

Line Scale Calibration in Non-Ideal Measurement Situation

2009 ◽  
Vol 147-149 ◽  
pp. 682-685 ◽  
Author(s):  
Saulius Kausinis ◽  
Albinas Kasparaitis ◽  
A. Barakauskas ◽  
Rimantas Barauskas ◽  
Aurimas Jakstas ◽  
...  
Keyword(s):  
Measurement Uncertainty ◽  
Modal Analysis ◽  
Dry Friction ◽  
Uncertainty Budget ◽  
Process Duration ◽  
Line Scale ◽  
Mode Of Operation ◽  
Scale Calibration ◽  
Dynamical Mode ◽  
Measurement Uncertainty Budget

The precision line scale calibration in dynamical mode of operation is considered. A new interferometer-controlled comparator with moving microscope has been developed and optimised in order to reduce both the measurement uncertainty and calibration process duration. Modal analysis performed and measurements conducted of the spatial vibrations of comparator structure revealed that dynamically-induced errors can noticeably contribute to the measurement uncertainty budget. They can be prominently reduced, in particular, by proper improvement and optimisation of the carriage structure and elimination of the dry friction in the carriage drive.

scholarly journals Analysis of the measurement uncertainty of a new measurement flexure calibration set-up

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 173
Author(s):  
K. Geva ◽  
H. Kahmann ◽  
C. Schlegel ◽  
R. Kumme
Keyword(s):  
Theoretical Analysis ◽  
Measurement Uncertainty ◽  
Measurement System ◽  
Uncertainty Budget ◽  
Bending Moments ◽  
Set Up ◽  
Measurement Uncertainty Budget

A measurement flexure calibration set-up is presented in this paper. The measurement flexures under test are part of a new 5 MN · m standard torque machine measurement system at the PTB. The calibration set-up can create transversal forces up to 200 N and bending moments up to 100 N · m and respectively up to 150 N · m torque moments simultaneously. The measurement uncertainty budget of the set-up is investigated in a theoretical analysis.

scholarly journals Measuring the Fluid Flow Velocity and Its Uncertainty Using Monte Carlo Method and Ultrasonic Technique

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Measurement Uncertainty ◽  
Flow Velocity ◽  
Analytical Method ◽  
Thermal Power ◽  
Uncertainty Budget ◽  
Combined Cycle ◽  
The Monte Carlo Method ◽  
Methods Analytical

One of the most important challenges in fluid mechanics, gas dynamics, and hydraulic machinery fields is measuring the flow velocity with high accuracy. It is more important in large systems; such as thermal power stations, large scale power generations, and combined cycle power plants. The exact estimation of the measurement uncertainty inflow velocity is extremely important in evaluating the accuracy of the measurement. This work describes the problem of estimating measurement uncertainty when there are two or more dominant components of the uncertainty budget. . Two methods, analytical and numerical methods are used to study the comparative analysis for the results of determining the expanded uncertainty of measurement using two methods: analytical method and the numerical method. The analytical method uses the law of uncertainty propagation and is based on the estimation of uncertainty values of type A and B, while the numerical technique depends on the evaluation of measured samples by the Monte Carlo method using a random number generator. The aim of this article is to show the Monte Carlo method as an alternative way to determine the distribution of individual components of the measurement uncertainty budget. Also, the measurement of liquid flow velocity by an ultrasonic method has been analyzed, which is commonly used due to high measurement accuracy and non-invasiveness. Due to the complexity of the equation defining the measured flow velocity, determining the measurement uncertainty is not an easy task.

scholarly journals The influence of source impedance on charge amplifiers

ACTA IMEKO ◽  
2014 ◽  
Vol 2 (2) ◽  
pp. 56 ◽  
Author(s):  
Henrik Volkers ◽  
Thomas Bruns
Keyword(s):  
Measurement Uncertainty ◽  
Systematic Errors ◽  
Uncertainty Budget ◽  
Charge Amplifier ◽  
Source Impedance ◽  
A Charge ◽  
Measurement Uncertainty Budget

This contribution discusses the influence of the source impedance on the complex sensitivity of a charge amplifier (CA). During calibration of a CA with varying source impedances deviations at higher frequencies were observed, which if not properly taken into account may generate systematic errors beyond the limits of the measurement uncertainty budget. The contribution discusses a model to describe the effect as well as an extension to established CA calibration procedures which allow to quantify and correct the effect.

scholarly journals Lack of Thermogram Sharpness as Component of Thermographic Temperature Measurement Uncertainty Budget

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4013
Author(s):  
Krzysztof Dziarski ◽  
Arkadiusz Hulewicz ◽  
Grzegorz Dombek
Keyword(s):  
Measurement Uncertainty ◽  
Temperature Measurement ◽  
Uncertainty Budget ◽  
Expanded Uncertainty ◽  
European Accreditation ◽  
Uncertainty Component ◽  
Number Of Components ◽  
B Method ◽  
Thermographic Measurement ◽  
Measurement Uncertainty Budget

The number of components of a thermographic temperature measurement uncertainty budget and their ultimate contribution depend on the conditions in which the measurement is performed. The acquired data determine the accuracy with which the uncertainty component is estimated. Unfortunately, when some factors have to be taken into account, it is difficult to determine the value of the uncertainty component caused by the occurrence of this factor. In the case of a thermographic temperature measurement, such a factor is the lack of sharpness of the registered thermogram. This problem intensifies when an additional macro lens must be used. Therefore, it is decided to commence research to prepare an uncertainty budget of thermographic measurement with an additional macro lens based on the B method described in EA-4/02 (European Accreditation publications). As a result, the contribution of factors in the uncertainty budget of thermographic measurement with additional macro lens and the value of expanded uncertainty were obtained.

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