Chu-Shik Kang, Jae Wan Kim, Jong-Ahn Kim, Tae Bong Eom
A new method of three-dimensional profile measurement of four-step reference specimens is presented. Instead of measuring only the height difference between central points of the two neighbouring surfaces of the specimen, overall profile of the whole specimen can be measured by using the fringe scanning Fourier transform method. The method to determine step height from its surface profile is proposed.
XIX IMEKO World Congress
· TC14
· 2009
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Luís Lages Martins, Álvaro Silva Ribeiro, Carlos Pina dos Santos
This study describes the measurement uncertainty propagation of the incident radiative heat flux density quantity associated with different exposure conditions of the heat flux meter, taking into account the convective effects in reaction to fire tests. To accomplish this aim, considering the complexity and non-linearity of the applied mathematical models to perform the indirect measurement of the above mentioned quantity, the Monte Carlo method was applied. The use of this numerical approach allows to estimate the quality of the measurements within a high accuracy level and to evaluate...
XIX IMEKO World Congress
· TC12
· 2009
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Jorma Jokela, Pasi Häkli, Joel Ahola, Arunas Buga, Raimundas Putrimas
Geodetic baselines are used to determine traceable lengths in geospatial applications. The 864-m-long Nummela Standard Baseline in Finland is a world-class length standard, which is used in calibrations of the most precise electronic distance measurement (EDM) instruments and in scale transfers around the world. At the moment new instruments based on new technology are developed to measure long distances; this is also a joint research project of the new European Metrology Research Programme (EMRP). As the state-of-the-art, the Nummela Standard Baseline is available for testing the new...
XIX IMEKO World Congress
· TC14
· 2009
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Feng-Yu Yang, Sheau-shi Pan
In OIML R111 (2004), six accepted methods for the determination of the density of weights are given. Method A is most accurate method and method D is an alternative way to determine the volume of large weights which are difficult to handle in hydrostatic weighing in an indirect way. In this paper, a hydrostatic weighing system by method A for large weights built up at CMS are described.
XIX IMEKO World Congress
· TC3
· 2009
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Yusuke Kajihara, Takeji Ueda, Patrick Nickels, Susumu Komiyama
A passive terahertz (THz) microscope has been developed for sensitive imaging of spontaneous THz radiation. The THz microscope consisted mainly of a Ge objective lens, a confocal pinhole, Ge relay lenses, and a highly sensitive THz detector (Charge-Sensitive Infrared Phototransistor, CSIP). Then experimental examinations of the developed microscope were performed. First, THz signals, which were related to the spontaneous thermal radiation, were reasonably obtained. Next a passive THz image was successfully achieved. The lateral resolution of the microscope was derived to be 25 µm, where the...
XIX IMEKO World Congress
· TC2
· 2009
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Renata Barros e Vasconcellos, Luiz Macoto Ogino
This paper describes the development of a four-terminal coaxial bridge, part of the traceability chain of the capacitance unit to the quantum Hall effect, in construction at Inmetro. This bridge will also be used to calibrate AC resistance and high-value capacitance standards. Here we describe the final construction stages and preliminary measurements of the four-terminal coaxial bridge. We also describe the bridge main transformers, grounding scheme, and AC resistance standards.
XIX IMEKO World Congress
· TC4
· 2009
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Akihiro Oota, Takashi Usuda, Hideaki Nozato, Tamio Ishigami, Tsuneo Kikuchi
Primary accelerometer calibration is carried out under the assumption that a vibration exciter gives a rectilinear motion to an accelerometer to be calibrated. However practical vibration given by the vibration exciter includes parasitic motion such as transverse, rocking, and bending motion. The parasitic motion especially gives two serious effects on primary calibration results, transverse sensitivity effect and vibration distribution effect. Transverse sensitivity effect is caused by an inner product of the vectors of both transverse motion and transverse sensitivity. On the other hand,...
XIX IMEKO World Congress
· TC22
· 2009
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Jean-Marc Linares, Jean-Michel Sprauel, Bernard Schlatterer
In this paper, mathematical tools, like Monte Carlo simulations and direct propagation methods based on the GUM, are experienced to calculate the uncertainty of a datum reference in orthopedic surgery. In the last approach, the Jacobian matrices of the measurement process are determined either by analytical calculus or through numerical computations. The methods are applied to the determination of reference frames in total knee arthroplasty. The different approaches are employed to calculate the uncertainties and the results are compared.
XIX IMEKO World Congress
· TC21
· 2009
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Chin-Fen Tuan, Fu-Lung Pan, Yi-Ching Lin, Sheau-shi Pan, Chung-Lin Wu
In this time of flourishing nanotechnology research and the miniaturization of relevant products, the mechanical properties, such as hardness and tensile strength, of relevant materials must be tested in order to ensure product reliability. Because such testing requires the measurement of miniscule forces, relevant testing systems must be traceable to tiny masses of less than one milligram. This paper chiefly investigates induction of the use of a set of weights ranging from 1 mg to 0.1 mg, and describes how 0.5 mg, 0.2 mg, and 0.1 mg weights can be traced from a 1 mg standard weight. This...
XIX IMEKO World Congress
· TC3
· 2009
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Atsuhiro Nishino, Koji Ogushi, Kazunaga Ueda
Many torque tools, such as torque wrenches and torque screwdrivers, as well as torque measuring devices (TMDs) of rated capacity of less than 5 N·m are being used. Thus, a small-rated-capacity torque standard has to be established as soon as possible. To this end, design and development of a dead-weight torque standard machine with a rated capacity of 10 N·m (10 N·m-DWTSM) started in 2006 at the National Metrology Institute of Japan, part of the National Institute of Advanced Industrial Science and Technology. In this report, overviews are given of the 10 N·m-DWTSM and a new 1 N·m TMD...
XIX IMEKO World Congress
· TC3
· 2009
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