R. Kumme, L. Brito
Two new deadweight force standard machines with capacities of 5 kN and 100 kN have been installed at IPQ. This paper describes the results of an intercomparison between the force standard machines of the National Metrology Institutes of Portugal (IPQ) and Germany (PTB). For the intercomparison, PTB used a set of force transfer standards which covered the whole force range from 50 N to 100 kN. The measurements were performed following the procedure used by PTB in intercomparison measurements. The influence of temperature differences in the various measurements was reduced by taking the...
TC3 Conference 2001
· TC3
· 2001
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K. K. Jain, H. N. P. Poddar, M. K. Chaudhuri
This paper describes the preliminary results of the performance of the newly developed 10 kN dead weight force machine at the National Physical Laboratory, India that would serve as national reference force standard with an expanded uncertainty lower than 30 ppm. Two well-characterized strain gauge transfer force standards of 5 kN and 10 kN full scale, having an uncertainty of 0.02% in the measured forces and repeatability better than 0.002% were calibrated in the machine. The observed results were analyzed with particular reference to repeatability, hysteresis, machine interaction etc that...
TC3 Conference 2001
· TC3
· 2001
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D. I. Kang, H. H. Shin, J.H. Kim, Y. K Park
A sensing element of column type was devised as a multi-component force/moment sensor by attaching strain gages. The ratio of length over diameter (L/D) for the sensing element was designed analytically and verified by finite element analysis. The fabricated sensor was evlauated by using a deadweight force/moment calibration machine within Korea Research Institute of Standards and Science (KRISS). The interference errors between force and moment components were minimized by addition and subtraction processes of signals obtained from strain gages. Finally the calibration showed that the...
TC3 Conference 2001
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· 2001
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J.Cruz, V. Prodonoff, J. Guerhar
This paper describes the research, development, construction, validation tests and metrological characterization of a Force Transducers Pyramid prototype (Build-Up System), in the nominal range of 600 kN. This system is used for the standardization and dissemination of the physical magnitude force, propitiating the utilization of alternative system for calibration of force measurement instruments, such as: force transducers, load cells, proving rings and scales of testing machines. In its construction three force transducers, in the nominal range of 200 kN were used, individually calibrated...
TC3 Conference 2001
· TC3
· 2001
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Y. K. Park, D. I. Kang, R. Kumme, A. Sawla
This paper describes the behaviour of deadweight force standard machines of 100 kN and 1 MN at the Physikalisch-Technische Bundesanstalt(PTB). A build-up system was used to measure the dynamic behaviour of the deadweight force standard machines. The oscillating signals from the force-transducers in a build-up system are much larger than those from a single force-transducer. This is because the force-transducers in a build-up system are located several tens of millimeters from the centre of the force-standard machine. Hence, small movements of the deadweight result in changes in the reaction...
TC3 Conference 2001
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· 2001
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S. S. Ahn, J. Y. Jeon, D.H. Kim, D. I. Kang
A high precision hydraulic force calibration system was developed, and the Best Measurement Capability(BMC) was evaluated for the system with maximum load capacities of of 100 kN and 500 kN, respectively. The calibration system consists of mechanical frame, hydraulic loading and contol system, reference force transducer, automated operating software, and data acquisition and analysis software. In addition to the conventional servo-controlled hydraulic system, a specially designed precision pressure controller was developed for minute load control during holding period at each load step, the...
TC3 Conference 2001
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· 2001
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C. Ferrero, C. Marinari
The IMGC-CNR recently acquired two new dead-weight Primary Force Standards, of 30 kN and 1 MN capacity, in addition to those already existing at the IMGC to meet the increasing demand from several industrial sectors in Italy for research and calibration work concerning force sensors and load cells to be used for weighing. In the present paper the IMGC Primary Force Standards are shortly described and the increase of the dissemination of the Force Unit in Italy, on the basis of the number of the accreditation and certificates issued, is given. The main results of the metrological evaluation...
TC3 Conference 2001
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· 2001
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B. Meißner
Force Standards Machines are calibrated according to EN 10002 part 3 (ISO376) or PTB Standards, DKD or VGM. Here, the absolute value of the force is of essential interest. For load cells, however, which shall be applied in weighing machines, the interest for the absolute force value is of second order, because weighing machines have to be adjusted and calibrated in the field. This procedure allows weighing machines to be adjusted with higher accuracy than force transducers can be calibrated. Basic ideas and results for the certification of a high capacity and high accuracy force machine used...
TC3 Conference 2001
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· 2001
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Jun Chen, Ryuji Itakura,Takashi Nakajima
We propose a simple scheme to characterize attosecond extreme ultraviolet (XUV) pulses. A broadband ultraviolet (UV) ~ vacuum ultraviolet (VUV) pump pulse creates a coherent super position of atomic bound states, from which photoionization takes place by the time-delayed attosecond XUV probe pulse. Information on the spectral phase of the XUV pulse can be extracted from the phase offset of the interference beating in the photoelectron spectra using a standard SPIDER (spectral phase interferometry for direct electric-field reconstruction) algorithm. We further discuss the influence of the...
TC2 Symposium 2010
· TC2
· 2010
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Yunpeng Wang, Chun-Liu Zhao , Xinyong Dong, Zaixuan Zhang, Shangzhong Jin
A practical temperature sensor by using a highly birefringent fiber loop mirror concatenated with a long-period grating written in a photonic crystal fiber (PCF) is proposed and the sensitivity of the sensor is about-0.4872 dB/℃.
TC2 Symposium 2010
· TC2
· 2010
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