scholarly journals Uncertainty of factor Z in gravimetric volume measurement

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 198
Author(s):  
Mar Lar Win
Keyword(s):  
Measurement Method ◽  
Volume Measurement ◽  
Liquid Volume ◽  
Combined Effects ◽  
Apparent Mass ◽  
Mass Measurements ◽  
Iso Standards ◽  
Uncertainty Calculation ◽  
Measurement Results

<p class="Abstract">In the gravimetric volume measurement method, the factor <em>Z</em> is generally used to facilitate an easy conversion from the apparent mass obtained using a balance to the liquid volume. The uncertainty of the measurement used for the liquid volume can be divided into two specific contributions: one from the components related to the mass measurements and one from those related to the mass-to-volume conversion. However, some ISO standards and calibration guides have suggested that the uncertainty due to the factor <em>Z</em> is generally neglected in the uncertainty calculation pertaining to gravimetric volume measurement. This paper describes the combined effects of the density of the water, the density of the reference weights, and the air buoyancy on the uncertainty of factor <em>Z</em> in terms of how they subsequently affect the uncertainty of the measurement results.</p>

Study on Liquid Volume Measurement Based on Wireless Transmission and Hydraulic Sensors

2012 ◽  
Vol 263-266 ◽  
pp. 392-397
Author(s):  
Jie Luo ◽  
Yun Hui Wang ◽  
Qian Wen Zhao ◽  
Hui Guo ◽  
Fei She
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Pressure Sensors ◽  
Volume Measurement ◽  
Wireless Transmission ◽  
Liquid Volume ◽  
Hydraulic Pressure ◽  
General Packet Radio Service ◽  
Service Module ◽  
Wireless Measurement

Based on hydraulic sensors and wireless transmission, a new wireless measurement method of liquid volume in a tank is introduced. This measurement system includes hydraulic pressure sensors, A/D converter, GPRS (General Packet Radio Service) module and upper monitor in a computer, from which the users can get aware of the liquid volume in a tank at any time. The measurement system has been built，calibrated and tested. The experimental results show that this measurement system works well and the measurement error is less than 1%.

Liquid volume measurement method for the picoliter to nanoliter volume range based on quartz crystal microbalance technology

2014 ◽  
Vol 25 (9) ◽  
pp. 095302 ◽  
Author(s):  
Dong Liang ◽  
Jin Zhang ◽  
Muniyogeshbabu Thanikhatla Govindaiah ◽  
Laurent Tanguy ◽  
Andreas Ernst ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Measurement Method ◽  
Quartz Crystal ◽  
Volume Measurement ◽  
Liquid Volume ◽  
Volume Range

Block Thickness Measurement of Using the Structured Light Vision

2018 ◽  
Vol 33 (01) ◽  
pp. 1955001 ◽  
Author(s):  
Fenghui Lian ◽  
Qingchang Tan ◽  
Siyuan Liu
Keyword(s):  
Machine Vision ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Thickness Measurement ◽  
Base Plane ◽  
Vision Measurement ◽  
Measurement Results ◽  
Measurement Equations ◽  
Structured Light Vision ◽  
Measuring Base

A method for measuring block thicknesses is proposed by the machine vision measurement. Equations of the measuring base plane and the light plane are formed by calibration. Then, the equation of the light strip image, that is, the image of the intersection between the base plane and light one, is established by the projection relation. Equation of the image of the light strip on the measured plane can be determined by the fitting. Since the light strip on the measuring base plane is parallel to one on the measured plane, the thickness of the measuring block is measured by using the two equations. The experiment evaluates the measurement accuracy of the measurement method and analyzes the influence of some factors on the measurement results.

scholarly journals Measurement experiences with FluxSet digital D/I station

2017 ◽  
Vol 6 (2) ◽  
pp. 279-284 ◽  
Author(s):  
László Hegymegi ◽  
János Szöllősy ◽  
Csaba Hegymegi ◽  
Ádám Domján
Keyword(s):  
Measurement Method ◽  
Measurement Data ◽  
Digital Form ◽  
New Instrument ◽  
Measurement Results ◽  
Inclination Angles ◽  
Flux Gate

Abstract. Geomagnetic observatories use classical theodolites equipped with single-axis flux-gate magnetometers known as declination–inclination magnetometers (DIM) to determine absolute values of declination and inclination angles. This instrument and the measurement method are very reliable but need a lot of handwork and experience. The authors developed and built a non-magnetic theodolite which gives all measurement data in digital form. Use of this instrument significantly decreases the possibility of observation errors and minimises handwork. The new instrument is presented in this paper together with first measurement results in comparison to the classical DIM.

scholarly journals Liquid Volume Measurement in a Space Tank

1992 ◽  
Vol 28 (6) ◽  
pp. 664-672
Author(s):  
Kajiro WATANABE ◽  
Yasushi OHKI ◽  
Satoru SUZUKI ◽  
Kunio TERADA ◽  
Yoshihito ABE ◽  
...  
Keyword(s):  
Volume Measurement ◽  
Liquid Volume

Comparison of Hand and Semiautomatic Tracing Methods for Creating Maxillofacial Artificial Organs using Sequences of Computed Tomography (CT) and Cone Beam Computed Tomography (CBCT) Images

2017 ◽  
Vol 40 (6) ◽  
pp. 307-312 ◽  
Author(s):  
Bence T. Szabo ◽  
Seçil Aksoy ◽  
Gabor Repassy ◽  
Krisztian Csomo ◽  
Csaba Dobo-Nagy ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Volume Measurement ◽  
Artificial Organs ◽  
Cone Beam ◽  
Artificial Organ ◽  
Volume Determination ◽  
Measurement Results ◽  
Volume Measurements ◽  
Maxillary Sinuses

Introduction The aim of this study was to compare the paranasal sinus volumes obtained by manual and semiautomatic imaging software programs using both CT and CBCT imaging. Methods 121 computed tomography (CT) and 119 cone beam computed tomography (CBCT) examinations were selected from the databases of the authors’ institutes. The Digital Imaging and Communications in Medicine (DICOM) images were imported into 3-dimensonal imaging software, in which hand mode and semiautomatic tracing methods were used to measure the volumes of both maxillary sinuses and the sphenoid sinus. The determined volumetric means were compared to previously published averages. Results Isometric CBCT-based volume determination results were closer to the real volume conditions, whereas the non-isometric CT-based volume measurements defined coherently lower volumes. By comparing the 2 volume measurement modes, the values gained from hand mode were closer to the literature data. Furthermore, CBCT-based image measurement results corresponded to the known averages. Conclusions Our results suggest that CBCT images provide reliable volumetric information that can be depended on for artificial organ construction, and which may aid the guidance of the operator prior to or during the intervention.

scholarly journals A Measurement Method of Microsphere with Dual Scanning Probes

2019 ◽  
Vol 9 (8) ◽  
pp. 1598 ◽  
Author(s):  
Fang ◽  
Huang ◽  
Xu ◽  
Cheng ◽  
Chen ◽  
...  
Keyword(s):  
Measurement Method ◽  
Coordinate Measuring Machine ◽  
Quartz Tuning Fork ◽  
Cross Sectional ◽  
Scanning Probes ◽  
Repeatability Error ◽  
Measurement Results ◽  
Size Standard ◽  
Measuring Machine ◽  
Tungsten Tip

The probe tip of a micro-coordinate Measuring Machine (micro-CMM) is a microsphere with a diameter of hundreds of microns, and its sphericity is generally controlled within tens to hundreds of nanometers. However, the accurate measurement of the microsphere morphology is difficult because of the small size and high precision requirement. In this study, a measurement method with two scanning probes is proposed to obtain dimensions including the diameter and sphericity of microsphere. A series of maximum cross-sectional profiles of the microsphere in different angular directions are scanned simultaneously and differently by the scanning probes. By integrating the data of these maximum profiles, the dimensions of the microsphere can be calculated. The scanning probe is fabricated by combining a quartz tuning fork and a tungsten tip, which have a fine vertical resolution at a sub-nano scale. A commercial ruby microsphere is measured with the proposed method. Experiments that involve the scanning of six section profiles are carried out to estimate the dimensions of the ruby microsphere. The repeatability error of one section profile is 15.1 nm, which indicates that the measurement system has favorable repeatability. The mainly errors in the measurement are eliminated. The measured diameter and roundness are all consistent with the size standard of the commercial microsphere. The measurement uncertainty is evaluated, and the measurement results show that the method can be used to measure the dimensions of microspheres effectively.

Noninvasive acoustic blood volume measurement system for the POLVAD prosthesis

2011 ◽  
Vol 59 (4) ◽  
pp. 429-433 ◽  
Author(s):  
Z. Opilski ◽  
G. Konieczny ◽  
T. Pustelny ◽  
A. Gacek ◽  
R. Kustosz ◽  
...  
Keyword(s):  
Blood Volume ◽  
Measurement System ◽  
Measurement Method ◽  
Helmholtz Resonator ◽  
Volume Measurement ◽  
System Construction ◽  
Test Results ◽  
Actual Measurement ◽  
Blood Volume Measurement ◽  
Future Plans

Noninvasive acoustic blood volume measurement system for the POLVAD prosthesisThe following paper presents researches concerning a noninvasive real-time blood volume measurement system applied in POLVAD prosthesis. The system is based on the acoustic Helmholtz resonator principle. The basis of the measurement method, followed by the preliminary tests of the possibility of incorporating the Helmholtz resonance idea into the POLVAD prosthesis is shown. The paper includes the actual measurement system construction and test results, both static and dynamic obtained at the Foundation for Cardiac Surgery Development in Zabrze, Poland. Conclusions and future plans are presented too.

Factors Affecting Oil Removal From an Aeroengine Bearing Chamber

2010 ◽  
Author(s):  
Budi Chandra ◽  
Kathy Simmons ◽  
Stephen Pickering ◽  
Marc Tittel
Keyword(s):  
Heat Generation ◽  
Volumetric Flow Rate ◽  
Volume Measurement ◽  
Working Fluid ◽  
Liquid Volume ◽  
Simple Liquid ◽  
Oil Removal ◽  
Two Phase ◽  
Ongoing Research ◽  
Excessive Heat

Aeroengines incorporate various bearing chambers that house the shaft bearings and the oil used to cool and lubricate these bearings must subsequently be recovered from these chambers. Effective oil removal (scavenge) is essential to avoid heat generation through unnecessary working of the oil which can lead to excessive heat generation and reduced overall efficiency. Therefore the design of the scavenge region (sump) in a bearing chamber, as well as the ability to assess its performance is very important. An ongoing research program into bearing chamber scavenge comprising experimental and computational components is being conducted at the University of Nottingham Technology Centre in Gas Turbine Transmission Systems. This program is enhancing understanding of sump performance and design. In this paper an experimental study into a simplified but representative scavenge is reported. This experimental work helps to further understanding of the complex two-phase flow physics in a bearing chamber, particularly in the scavenge region, by means of various measurements and flow visualization. For the study a bespoke test rig has been built. It consists of a simplified, generic bearing chamber with simple sump geometry constructed entirely of Perspex to allow visualization. A shaft in the centre of the chamber capable of rotating up to 15,000 rpm is employed to introduce a windage flow in the chamber. Water (the working fluid) is fed to the chamber via an inlet pump and an outlet pump removes liquid from the chamber, closing the circuit. Several pneumatic pinch valves are installed in the flow circuit to allow residence volume measurement. A completely air-tight reservoir with internal baffle functions as a simple liquid-gas separator, allowing measurement of gas volumetric flow rate in the off-take pipe; hence the scavenge ratio (ratio of total exit volume to liquid volume) can be obtained. Residence volume measurements highlight the importance of sump geometry as an ill-designed sump can lead to an undesirable increase in residence volume.

scholarly journals Comparison of selected theoretical models of bubble formation and experimental results

2014 ◽  
Vol 35 (2) ◽  
pp. 21-36 ◽  
Author(s):  
Mariusz R. Rząsa
Keyword(s):  
Measurement Method ◽  
Formation Rate ◽  
Bubble Formation ◽  
Theoretical Models ◽  
Measuring System ◽  
Gas Bubble ◽  
Measurement Results ◽  
Intermediate States ◽  
Determination Of Parameters

Abstract Designers of all types of equipment applied in oxygenation and aeration need to get to know the mechanism behind the gas bubble formation. This paper presents a measurement method used for determination of parameters of bubbles forming at jet attachment from which the bubles are displaced upward. The measuring system is based on an optical tomograph containing five projections. An image from the tomograph contains shapes of the forming bubbles and determine their volumes and formation rate. Additionally, this paper presents selected theoretical models known from literature. The measurement results have been compared with simple theoretical models predictions. The paper also contains a study of the potential to apply the presented method for determination of bubble structures and observation of intermediate states.

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