scholarly journals MICROPHONE FRONT CAVITY DEPTH MEASUREMENT USING NON-CONTACT METHOD AT NATIONAL MEASUREMENT STANDARDS – NATIONAL STANDARDIZATION AGENCY OF INDONESIA

2019 ◽  
Vol 21 (2) ◽  
pp. 143
Author(s):  
Chery Chaen Putri ◽  
Denny Hermawanto
Keyword(s):  
Uncertainty Budget ◽  
Contact Method ◽  
Primary Method ◽  
Cavity Depth ◽  
Depth Measurement ◽  
Pressure Calibration ◽  
Permissible Range ◽  
National Measurement ◽  
Measurement Uncertainty Budget

<p>Front cavity depth of microphone has influence in the determination of laboratory standard microphone sensitivity. Therefore this parameter is included in the measurement uncertainty budget. To determine microphone sensitivity accurately, it is necessary to measure the actual front cavity depth instead of using nominal value. This paper explains the measurement of LS1P and LS2P standard microphone front cavity depth using optical depth measurement facilities at SNSU-BSN and its effect on determining microphone sensitivity. The measurement was obtained from 4 positions distributed over the diaphragm for each microphone. The front cavity depth measurement result for LS1P is 1,94 mm ± 0,01 mm and for LS2P is 0,48 mm ± 0,01 mm  These results comply with IEC 61094 Measurement Microphones-Part 2: Primary Method for Pressure Calibration of Laboratory Standard Microphones by Reciprocity Technique as the results are within the permissible range.</p>

DESTRUCTIVE METHODS FOR DETERMINING RESIDUAL STRESSES (review)

2021 ◽  
pp. 95-104
Author(s):  
A.D. Monakhov ◽  
◽  
N.O. Yakovlev ◽  
V.V. Avtaev ◽  
E.A. Kotova ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Residual Stresses ◽  
Speckle Interferometry ◽  
Image Correlation ◽  
Strain Gauges ◽  
Contact Method ◽  
Layer By Layer ◽  
Deep Hole ◽  
Destructive Methods

The paper presents an overview of methods for determining residual stresses. Methods such as splitting and segmentation, layer-by-layer removal, slitting (cutting, pliability), profiling, drilling holes (including a «deep» hole) are considered. The description of the methods for mea-suring the deformation used in the determination of residual stresses is given. The most common contact method using strain gauges, as well as non-contact methods: polarization-optical (photo-elasticity), optical speckle interferometry, digital image correlation.

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

Determination of pumping speed and its impact on the overall uncertainty budget of the CMI orifice flow standard

Metrologia ◽  
2008 ◽  
Vol 45 (3) ◽  
pp. 368-375 ◽  
Author(s):  
L Peksa ◽  
T Gronych ◽  
P Řepa ◽  
J Tesař ◽  
M Vičar ◽  
...  
Keyword(s):  
Uncertainty Budget ◽  
Orifice Flow

scholarly journals Determination of mechanical properties by nanoindentation independently of indentation depth measurement

2012 ◽  
Vol 27 (19) ◽  
pp. 2551-2560 ◽  
Author(s):  
Gaylord Guillonneau ◽  
Guillaume Kermouche ◽  
Sandrine Bec ◽  
Jean-Luc Loubet
Keyword(s):  
Mechanical Properties ◽  
Indentation Depth ◽  
Depth Measurement ◽  
Image Position

Abstract

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.

Research on Accuracy of a Boat Position Determination Using GNSS Techniques in Kinematic Mode

2017 ◽  
Author(s):  
Zbigniew Siejka
Keyword(s):  
Research Work ◽  
Precise Determination ◽  
Global Navigation Satellite Systems ◽  
Floating Platform ◽  
Satellite Systems ◽  
Depth Measurement ◽  
Satellite Positioning ◽  
Global Navigation Satellite ◽  
Hydroacoustic Survey

The main aim of this work is research on the use of satellite positioning GNSS – RTK / RTN techniques to estimate the trajectory of a hydrographic boat. Modern hydrographic boat is the carrier of advanced bathymetry system, integral with GNSS positioning techniques. The key elements of the correct execution of the hydroacoustic survey are two elements: the height of the water surface and precise determination of the position in the moment of performing depth measurement. Integrated Bathymetric System (ZSB) is installed on a floating platform which is in constant motion. To obtain correct results of the hydroacoustic survey, it is necessary to know the precise (3D) position of the platform. In this paper the author presented his own research on the precise determination of accurate and reliable trajectory of a boat. The proposed method uses Real Time Kinematic (RTK) techniques of satellite positioning GNSS (Global Navigation Satellite Systems). The article presents examples of the results obtained during the research work at the largest Polish river.

scholarly journals The accuracy of FOM instrument used in on-line pig carcass classification in the Czech Republic

2008 ◽  
Vol 52 (No. 6) ◽  
pp. 149-158 ◽  
Author(s):  
M. Šprysl ◽  
J. Čítek ◽  
R. Stupka ◽  
L. Vališ ◽  
M. Vítek
Keyword(s):  
Czech Republic ◽  
Measurement Errors ◽  
Muscle Thickness ◽  
The Czech Republic ◽  
High Agreement ◽  
Lean Meat ◽  
Depth Measurement ◽  
Operator Error ◽  
On Line

The objective of this study was to document the accuracy of the classification equipment used in the Czech Republic with respect to measurement errors in lean meat percentage prediction such as point of measurement error, equipment error as well as operator error. To this end, a total of 720 pigs were measured in one abattoir. One can say from the results that the correlations between correct and surrogate measurements of fat depth are high (0.95&minus;0.98), for muscle thickness they are lower ranging from 0.49 to 0.88, and for lean meat percentage they are in the range of 0.85&minus;0.95. The lowest correlation (0.49) was calculated for muscle depth measurement between the 2nd and 3rd last rib when the place of measurement was moved 1 cm in the caudal direction, which influenced the level of the FOM correlation. It was further demonstrated that for the second insertion the differences in lean meat percentage prediction ranged from &minus;6.07% to +9.29%. It was also demonstrated that various instruments provided identical measurements of fat depth (<i>r</i> = 0.57&minus;0.97), while for muscle depth the performance was worse (<i>r</i> = 0.38–0.78), which caused a fluctuation in the prediction of lean meat percentage with differences ranging from &minus;2.56% to +2.81%. It can also be concluded that a high agreement between operators was demonstrated for the determination of lean meat percentage (<i>r</i> = 0.71&minus;0.80).

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