Jookeun Park, Gun Woong Bahng
Technical barrier to trade (TBT) has become one of the significant non-tariff measures with the advent of the WTO system in 1995. The key issue in TBT is that technical regulations, standards, and conformity assessment should not be used as barriers to trade. Regarding conformity assessment, the WTO/TBT Agreement recommends members to enter into negotiations for the mutual recognition of results of each other's conformity assessment, as well as to permit participation of conformity assessment bodies located in other members. In this paper, it will be reviewed why the role of measurement...
XIX IMEKO World Congress
· TC11
· 2009
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W. M. S. Wijesinghe, Young Tae Park
A three-phase power analyzing system based on digital signal processing (DSP) has been developed as a traveling standard for onsite power calibration. The design and operation is described for a sampling wattmeter capable of measuring power parameters of sinusoidal signal with frequencies of 50 to 60 Hz and measuring harmonics of nonsinusoidal signals up to 3 kHz. The system is utilized with digital-to-analog converts synchronized with each other. Software has been developed to calculate power parameters using the digital signal processing technique. The calibration system is traceable to...
XIX IMEKO World Congress
· TC4
· 2009
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Maurizio Leopardi, Maria Teresa Todisco
In the laboratory of Hydraulics and Hydraulic Construction of the Faculty of Engineering of L'Aquila, a physical model was made for the study of steady-state, gradually varied motion flow in open channel networks. For this study, a calculus algorithm has been used proposed by [1] which gives, in the case of slow water flow into gradually declined channels, in the direction of motion, the volumes and water levels respectively, in all the nodes and sides of the network.
XIX IMEKO World Congress
· TC9
· 2009
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In-Mook Choi, Sam-Yong Woo, Han-Wook Song, Boo-Shik Kim, Ho-Young Lee
Applications of high pressure are becoming more important in the field of heavy machinery, plant industries, novel material development and so on. The requirement of the maximum pressure limit is being constantly increased. This paper describes a sealing concept designed to increase pressure up to 500 MPa or more using bronze filled PTFE (PolyTetraFluoroEthylene) which takes advantages of both metal and PTFE. The sealing effect and the test results of the simple structure, which are similar to a re-entrant piston/cylinder, will be described in this paper.
XIX IMEKO World Congress
· TC16
· 2009
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Toralf Hoch, Ernst von Lavante
Generally, the determination of the performance and quality of volumetric flow meters is being carried out using so called error curves. They are the result of experiments performed on test rigs for different design variations and operating conditions. In order to augment this development process for flow meter to reduce costs in terms of money and time, computational fluid dynamics (CFD) software has been applied as the so called "Numerical Test Rig". This "Numerical Test Rig" includes a full three-dimensional flow simulation of a realistic meter configuration. Close attention was paid to...
XIX IMEKO World Congress
· TC9
· 2009
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Yong Shim Yoo, Bong-Hak Kim, Chul-Woung Park, Dong-Hoon Lee, Seung-Nam Park
We measured the size-of-source-effect (SSE) of a transfer reference thermometer (TRT) for the low-temperature mode with the spectral range from 8 µm to 14 µm by using the direct method. The measurements were carried out for various blackbody temperatures from 10 °C to 300 °C. The size of source changed from 10 mm to 80 mm in diameter. Taking the radiation from the masked area of the aperture plate and its surroundings into account, we observed that the SSE curves measured at various temperatures overlaps well. The SSE functions show a two-step saturation behaviour unusually. Excluding the...
XIX IMEKO World Congress
· TC12
· 2009
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Wakil Khan, Y.H. Shin, S.S. Hong
Vacuum technology is one of the established advanced technologies, of present age, in the field of research and industry. Having numerous applications, in the areas of human activities, one is concerned with a relatively large vacuum chamber where pressure distribution is, usually, not uniform during dynamic gas flow. To minimize the pressure non-uniformities in such chambers, baffles are generally used. In the present work, rectangular-shaped baffles of different sizes are used in a cylindrical-shaped chamber of a flow-control system, developed by Korea Research Institute of Standards and...
XIX IMEKO World Congress
· TC16
· 2009
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Fumihiro Sakuma
The ambient or instrument temperature affects the outputs of a standard radiation thermometer through various parts such as a detector, a feedback resistance and an interference filter. Usually the output was corrected by one coefficient assuming the linear dependence. If the filter wavelength changes, the dependence is different at each target temperature. We measured the temperature coefficients of Topcon radiation thermometers at different target temperatures and found the target temperature dependence as well as the feed back resistance dependence. Therefore a high stability radiation...
XIX IMEKO World Congress
· TC12
· 2009
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Jun Wang, Hongmei LI, Liandi Ma
The growing attention is paid to food analysis area in recent years. National Metrology Institutes have been playing the important roles in obtaining reliable, comparable and traceable analytical data. In this paper, the tasks and performances of National Institute of Metrology (NIM) China in the National System of Metrology in Chemistry (NSMiC) for food analysis are reviewed in the following aspects including: establishing the national primary standards, developing CRMs, organizing national proficiency tests, participating in CCQM comparisons and claiming Calibration Measurement...
XIX IMEKO World Congress
· TC23
· 2009
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Rocío Muñiz, Miguel Angel Pérez, Cristina de la Torre, Carlos Enrique Carleos, Norberto Corral, Jesús Angel Baro
Visible and Near InfraRed (VIS-NIR) spectrometry from 400 to 1100 nm in addition to Partial Least Squares (PLS) regression or Principal Component Regression (PCR) is a very interesting method to measure several important parameters of non-homogenised fresh milk such as fat, lactose and total protein content. These parameters can be used to analyze the nutritional properties of milk and, consequently they are very important to determine the economic value of produced milk. This paper studies and compares the potential use of PCR and PLS statistical methods to obtain the values of milk...
XIX IMEKO World Congress
· TC23
· 2009
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