Thomas Fehling, Thomas Fröhlich, Detlef Heydenbluth
The 1kg-prototype balance is a result of the technical collaboration between the Sartorius AG and the BIPM. Construction and functionality of the 8-position load alternator are based on the known BIPM FB2-technology. The 1kg-Prototype balance is constructed for highly accurate mass determination and is developed to create and maintain the national mass scale as well as the use for research and development. It permits the weighing of Pt-Ir or stainless steel masses from 100g to 1 kg as well as 1kg silicon spheres or buoyancy artifacts. The complete measurement device is installed inside an...
Force, Mass and Torque Measurements
· TC3
· 2005
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Jong-Ho Kim, Hyo-Jik Lee, Jeong-Il Lee, Yon-Kyu Park, Min-Seok Kim, Dae-Im Kang
This paper describes the development of a three-component silicon-based force sensor with a square membrane using bulk micromachining process. The designed sensor, with size of 2 mm x 2 mm, has a maximum force range of 5 N in the x, y, and z direction. Optimal locations of piezoresistors were determined by the strain distribution obtained from finite element analysis and beam theory. Finally three Wheatstone bridge circuits were arranged and verified under Fx, Fy, and Fz loading conditions. The silicon-based sensor was fabricated using bulk microfabrication technology(MEMS). The...
Force, Mass and Torque Measurements
· TC3
· 2005
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Georg Wegener, Jürgen Andrae
The objective of the presented study is to introduce a method for estimating the measurement uncertainty of torque measurements. Unlike the well-known approaches, the uncertainty shall take into account the effects acting during torque measurement in industrial applications like power test stands. These effects include the effects also known from laboratory calibration like hysteresis, linearity or interpolation deviation, repeatability, reproducibility. But special emphasis is put on an estimation of their impact under the conditions in the power test stand. Additionally, further effects...
Force, Mass and Torque Measurements
· TC3
· 2005
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T. Yan, B. E. Jones, R. T. Rakowski, M. J. Tudor, S. P. Beeby, N. M. White
A new torque transducer with high overload capability and direct frequency output is reported. It employs the recently developed metallic triple-beam resonators with thick-film printed lead zirconate titanate (PZT) drive and pickup elements. The new torque transducer has been tested in a torque range of up to 20 Nm, resulting in a strain level of 400 microstrain on the measurement shaft surface and giving a large frequency-change output of 800 Hz. The strain level required by the new torque transducer can be much lower (~100 microstrain) than the level (~1800 microstrain) usually required by...
Force, Mass and Torque Measurements
· TC3
· 2005
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In-Mook Choi, Jong-Ho Kim, Hyo-Jik Lee, Min-Seok Kim, Yeon-Kyu Park, Sam-Yong Woo, Dae-Im Kang
Micro/Nano force measurement is becoming more essential in the fields of AFM metrology, biomedical industries, chemical industries, and material science. For the micro/nano force measurement, a cantilever mounted with Ni/Cr conducting wire has been fabricated by MEMS process. The cantilever with high sensitivity can be driven by Lorentz force which is generated by applying current into the wire under uniform magnetic flux. In order to measure micro/nano force precisely, the cantilever is controlled to a null position with the Lorentz force opposing to a vertical input force. The active...
Force, Mass and Torque Measurements
· TC3
· 2005
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Koji Ohgushi, Takashi Ota, Kazunaga Ueda
A deadweight-type torque standard machine of 20 kN·m rated capacity (20 kN·m-DWTSM) has been designed and developed by the National Metrology Institute of Japan (NMIJ) at the National Institute of Advanced Industrial Science and Technology (AIST). Each uncertainty contribution comes mainly from the performance of each mechanical part of the 20 kN·m-DWTSM. Authors evaluated the uncertainty of the mass of the linkage weights, local acceleration of gravity, influence of air buoyancy on deadweight loading, initial moment-arm length (including CMM measurement and temperature compensation), and...
Force, Mass and Torque Measurements
· TC3
· 2005
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M. Grum, M. Terlep, M. Oblak, L. Miklavcic
Several derivations from the WELMEC gravity concept concerning non-automatic weighing instruments that are sensitive to the gravity were developed and analyzed. Apart from that, the gravity field model was developed for a territory of the Republic of Slovenia based on the geographical data and empirical gravity formula. It was established that some simplifications comparing to the WELMEC gravity zone concept could be introduced regarding free movement of weighing instruments across Slovenia. Limitations were set up concerning instruments’ characteristics that have to be regarded when the...
Force, Mass and Torque Measurements
· TC3
· 2005
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M. Oblak, M. Grum, M. Terlep
The work presents an improved approach to the determination of magnetic properties of weights, which have a shape according to OIML R111. The main stress is laid on a measurement of the volume magnetic susceptibility and an evaluation of its uncertainty. The method is presented, how the volume magnetic susceptibility of the OIML weight can be determined taking into account an actual shape of the weight instead of using only an approximation of its shape with "outer" and "inner" cylinders. Monte Carlo simulation was used to evaluate the measurement uncertainty. The susceptibility of 1 kg...
Force, Mass and Torque Measurements
· TC3
· 2005
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Adrian Gherasimov, Eugen Ghita
The paper presents some technical aspects about the Romanian system built-up to ensure the traceability of force measurements to the SI units. The regulations of the traceability schemes and the steps to be followed are presented. The Force Laboratory Timisoara, pending of Romanian Bureau of Legal Metrology proposed and implemented the national traceability of force measurements. The paper presents the best measurements capabilities, which the Romanian calibration laboratories offer for force measurements. In order to perform a national and international validation of the force measurements...
Force, Mass and Torque Measurements
· TC3
· 2005
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Adrian Gherasimov, Eugen Ghita
The paper presents a practical example for the evaluation of the uncertainty in calibration using a comparison force standard machine with a maximum load of 1000 kN, tension and compression mode. The uncertainty of measurement associated with the input estimates is evaluated. It is also presented a way to minimize the uncertainty of the applied force with the view to attaining the necessary value for the calibration of class 1 force transducers, in accordance with ISO 376:1999. For this purpose an evaluation of the loading regime of the force machine is presented. There was identified the...
Force, Mass and Torque Measurements
· TC3
· 2005
· Download