National Institute of Metrology

Bangkok, Thailand

National Institute of Metrology

Bangkok, Thailand
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Calin M.R.,Horia Hulubei National Institute of Physics and Nuclear Engineering | Druker A.E.,National Institute of Metrology
Romanian Reports of Physics | Year: 2011

The paper presents the energy and FWHM calibration of a gamma spectrometric system with a HPGe detector on the basis of the environmental spectrum.

Valcu A.,National Institute of Metrology
XXI IMEKO World Congress "Measurement in Research and Industry" | Year: 2015

In 2013, the National Prototype of the Kilogram (NPK) No.2 belonging to Romania, together with stainless steel kilogram standard Ni81, received an updated mass value from BIPM. Therefore, the first task after their receiving from BIPM was to perform comparisons between NPK and reference kilograms stainless steel standards. In the paper are described mass standards, weighing scheme used for comparisons, calculations of mass and associated uncertainties, as the mass change for all weights involved. It is also presented a comparison between Romanian CMC(s) and other countries for this important stage of dissemination of mass unit.

Melikyan S.R.,National Institute of Metrology
Measurement Techniques | Year: 2015

A new nonlinear optical laser surface profilometer with micron surface resolution is considered. It is shown that with a resolution of the spectrometer of 0.23 nm the spatial resolution of the proposed method may reach 22.5 μm. © 2015, Springer Science+Business Media New York.

Based on the reference document [1], the article proposes the way to calculate the errors of indication and associated measurement uncertainties, by resorting to the general information provided by the calibration certificate of a balance (non-automatic weighing instruments, shortly NAWI) used in medical field. The paper may be also considered a useful guideline for: - operators working in laboratories accredited in medical (or other various fields) where the weighing operations are part of their testing activities; - test houses, laboratories, or manufacturers using calibrated non-automatic weighing instruments for measurements relevant for the quality of production subject to QM requirements (e.g. ISO 9000 series, ISO 10012, ISO/IEC 17025); - bodies accrediting laboratories; - accredited laboratories for the calibration of NAWI. Article refers only to electronic weighing instruments having maximum capacity up to 30 kg. Starting from the results provided by a calibration certificate it is presented an example of calculation. © 2011 IFSA.

Jeerasak Pitakarnnop A.,National Institute of Metrology
20th IMEKO World Congress 2012 | Year: 2012

Flows of a gas through piston-cylinder gap of a gas-operated pressure balance and in general vacuum system have one similar aspect, i.e., the gas is rarefied due to small passage and low pressure, respectively. The flows in both systems could characterize in either slip flow regime or transition regime. Therefore, fundamental researches of flow in these regimes are useful for both pressure and vacuum metrology, especially for the gas-operated pressure balance where continuum viscous flow model is widely used for determining an effective area of pressure balance. The consideration of gas flow using suitable assumption would improve the accuracy of such calculation. Moreover, knowledge in rarefied gas flow contributes a predictability of gas behaviors in vacuum and low-flow leak detection system. This paper provides useful information of rarefied gas flow in both slip flow and transition regimes. Copyright © (2012) by the International Measurement Federation (IMEKO).

Duta S.,National Institute of Metrology
17th International Congress of Metrology, CIM 2015 | Year: 2015

In various measurement areas such as the quality of life and environment monitoring, the public health and food quality, there are performed a large variety of spectrochemical measurement techniques, such as, by molecular spectrometry (UV-VIS), by atomic absorption spectrometry (AAS), by inductively coupled plasma spectrometry (ICP), by optical emission spectrometry (OES), by X-ray spectrometry etc. The metrological calibration of these instruments are instrument specific. Some related metrological concepts and practical example regarding the linear calibration of the optical emission instruments by using certified reference materials are presented. © 2015 Owned by the authors, published by EDP Sciences.

Mekid S.,University of Manchester | Vacharanukul K.,National Institute of Metrology
Measurement: Journal of the International Measurement Confederation | Year: 2011

A new in-process and non-contact probe is proposed to measure the diameter and the roundness of turned workpieces. The initial probe discussed in previous publications exhibited diameter measurements with good accuracy (uncertainty 5 μm over 100 mm). This paper discusses the implementation of roundness measurement into the initial probe and its performance. The principle of the roundness measurement is based on the relationship between the displacement and the light intensity. The probe delivers a maximum error of 0.5 μm with an uncertainty of 1 μm for roundness measurement over a range of 100 mm diameter. © 2010 Elsevier Ltd. All rights reserved.

National Institute Of Metrology | Date: 2013-11-29

The present invention relates to a device and method for visual threshold measurement, which belongs to the field of optical precision measurement technology. The device comprises a first uniform plane light source system, a second uniform plane light source system, a first primary color adjusting system, a second primary color adjusting system, a first complementary color adjusting system, a second complementary color adjusting system, a first color mixture system, a second color mixture system, and a beam splitting system. The device can generate four observation targets with variable brightness (illumination), contrast, color difference, and periodic pattern frequency, by using a four-integrating sphere light source system and by multiplexing the color adjusting systems, the color mixture systems, and subsequent light paths, so as to implement multi-parameter measurement for a set of visual thresholds. One device can simultaneously measure visual illumination, contrast, and color difference thresholds, and achieve ease operation, wide range measurement, multi-measurement-parameter coverage, large color gamut adjustment range, and high light source output power.

Valcu A.,National Institute of Metrology
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

The paper presents the assessment way of electronic weighing instruments according to their use. Thus, in mass measurements there are two ways to use a weighing instrument: as a mass comparator, in the dissemination of mass unit from national mass standard to standards of the lowest accuracy and as a direct weighing instrument, a common balance, used in different applications. Even if, in term of constructive and functional points of view the two type of weighing instruments are not different, their use differs and hence, the need to approach different assessment methods. In the paper, it is highlighted the difference between determination of measurable properties by calibration, for both, mass comparators and a common balance (non-automatic weighing instruments-NAWI), making a parallel between them. © 2015 IEEE.

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