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.

scholarly journals Uncertainty of Thermographic Temperature Measurement with an Additional close-up Lens

2021 ◽  
Vol 21 (6) ◽  
pp. 185-190
Author(s):  
Krzysztof Dziarski ◽  
Arkadiusz Hulewicz
Keyword(s):  
Temperature Measurement ◽  
Spatial Resolution ◽  
Measurement Method ◽  
Uncertainty Budget ◽  
Contact Temperature ◽  
European Accreditation ◽  
Electrical Device ◽  
Thermographic Measurement

Abstract The thermographic temperature measurement is burdened with uncertainty. This non-contact temperature measurement method makes it possible to measure the temperature of the electrical device under load. When the observed object is small (a few square millimeters) the spatial resolution of the thermographic cameras is often insufficient. In this case, the use of the additional macro lens is needed. After using an additional lens, the uncertainty of the thermographic measurement is different from the uncertainty of thermographic measurement without an additional lens. The values of the uncertainty contributions depend on the conditions during the measurement and the used methodology. The authors constructed an uncertainty budget of thermographic temperature measurement with an additional macro lens, based on EA-4/02 (European Accreditation publications). The uncertainty contributions were also calculated. On the basis of the calculated values of the uncertainty contributions, it was determined which factor had the greatest impact on the value of the thermographic temperature measurement with an additional lens.

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 Task‐specific measurement uncertainty budget of Curvic‐coupling using analytical methods

2019 ◽  
Author(s):  
Bekim V. Gashi ◽  
Trevor Toman ◽  
Ranveer S. Matharu
Keyword(s):  
Measurement Uncertainty ◽  
Time Constant ◽  
Thermal Effects ◽  
Type A ◽  
Uncertainty Budget ◽  
Thermal Time ◽  
Expanded Uncertainty ◽  
Thermal Time Constant ◽  
Repeatability And Reproducibility ◽  
Transient Thermal

A number of Industrial reference components manufactured by grinding to achieve tight dimensional tolerances. In this paper, we present an uncertainty budget of a reference forty-tooth #Curvic measured using an accurate Coordinate Measuring Machine (CMM) in a temperature-controlled laboratory. A number of measurements conducted on Curvicto assess measurement repeatability and reproducibility. Expanded uncertainty budget evaluated from twenty-one Influencing factors, giving8.7 µm (7.1 µm from Type A) and 11 µm (9.6 µm from Type A), respectively, for repeatability and reproducibility test (k >2). Measurement uncertainty due to steady-state thermal effects is 2.2 µm. An adaptable model is presented to evaluate transient thermal effects, a factor often neglected in measurement uncertainty. Thermal time constant uncertainty associated with transient thermal effects is evaluated u(τ)= ±398 s, which corresponds to ±15 % of thermal time constant expanded uncertainty, u(τ)= ±2570 s. #Curvic® (Curvic is a trademark of The Gleason Works, 1000 University Avenue, Rochester, NY, 14603, USA)

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.

An approach to establish the uncertainty budget of catalytic activity concentration measurements in a reference laboratory

2015 ◽  
Vol 53 (5) ◽  
Author(s):  
Laura Rami ◽  
Francesca Canalias
Keyword(s):  
Catalytic Activity ◽  
Measurement Uncertainty ◽  
Activity Concentration ◽  
Uncertainty Budget ◽  
Reference Laboratory ◽  
Expanded Uncertainty ◽  
Iso 17025 ◽  
Reference Measurement ◽  
Uncertainty Sources ◽  
Primary Reference

AbstractReference laboratories providing reference services recognized by the Joint Committee for Traceability in Laboratory Medicine (JCTLM) must be accredited as calibration laboratories according to ISO 17025 and ISO 15195. These standards require laboratories to establish an uncertainty budget, in which the uncertainty contributions of the relevant uncertainty components are specified. We present a model to estimate the measurement uncertainty of creatine kinase catalytic activity concentration results obtained by IFCC primary reference measurement procedure.The measurement uncertainty has been estimated by following the next steps: 1) specification of the measurand; 2) identification of the most relevant uncertainty sources; 3) estimation of standard uncertainties by either type A or type B evaluation; 4) estimation of combined uncertainty while taking into account sensitivity coefficients, as well as existence of correlated uncertainty sources; and 5) estimation of expanded uncertainty with a defined coverage probability.The estimated expanded uncertainty was 2.2% (The present model is an approach to establish the uncertainty budget of primary reference procedures for the measurement of the catalytic activity concentration of enzymes, and aims at being an example to be followed by other reference laboratories, as well as by laboratories that carry out primary reference measurement procedures.

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