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Page 716 of 977 Results 7151 - 7160 of 9762

Michael Kobusch, Thomas Bruns, Leonard Klaus, Michael Müller
THE 250 KILONEWTON PRIMARY SHOCK FORCE CALIBRATION DEVICE AT PTB

A new facility for primary shock force calibrations up to 250 kN force amplitude is presented. Shock forces are generated by the impact of two airborne cylindrical mass bodies. Two laser-Doppler interferometers simultaneously measure the bodies’ dynamic motions on their axes of motion. Traceability of force is realised by the determination of mass and acceleration.

Meng Feng, Zhang Yue, Zhang Zhimin, Sun Qiao
A NEW METHOD FOR DYNAMIC FORCE MEASUREMENT AT NIM

The paper describes a new method for dynamic force measurement at NIM. National institute of Metrology has established fall hammer type1MN dynamic force standard equipment. According to Newton’s law, the dynamic force acting on the force transducer is traceable to mass and acceleration by F = m · a, where m is the mass of hammer and a is the impact acceleration of hammer. Original we measure the impact acceleration of drop hammer by a standard accelerometer. Now we measure the acceleration by a laser Interferometer. Traceability for force is realized via the measurement of acceleration with laser- Doppler-interferometers and the determination of the dropping masses. This paper introduces the structure and the working principle of the equipment, performance parameters and the uncertainty evaluation. This paper also compares the data between the accelerometer and laser-Dopplerinterferometer.

Y. Yamakawa, T. Yamazaki
DYNAMIC BEHAVIOR OF CHECKWEIGHER WITH ELECTROMAGNETIC FORCE COMPENSATION (2ND REPORT)

This paper describes the dynamic behaviors of a high speed mass measurement system with conveyor belt (a checkweigher). The objective in this study is to propose the model of the measurement system. The checkweigher with electromagnetic force compensation can be approximated by the combined spring-mass-damper systems as the physical model, and the equations of motion are derived. The model parameters can be obtained from the experimental data. Finally, the validity of the proposed model can be confirmed by comparison of the simulation results with the realistic responses. The dynamic model obtained offers practical and useful information to examine control scheme.

Jorge C. Torres-Guzmán, Miguel Viliesid-Alonso, Luis Omar Becerra-Santiago, Roberto Arias-Romero
GUIDE FOR A PEER REVIEW

This guide has been developed with the purpose of having a method to conduct a peer review. The objective is to set the general guidelines to ensure the objectives, development, documentation of the findings and the final report writing in a peer review. This guide is based in a previous document and includes recent documents recommendations from CIPM, JCRB as well as ISO written standards and peers recommendations from peer reviews conducted.

Tomasz R. Wolinski, Slawomir Ertman, Marzena Tefelska, Piotr Lesiak, Andrzej W. Domanski, Roman Dabrowski, Edward Nowinowski-Kruszelnicki
DYNAMICALLY TUNABLE BIREFRINGENCE IN PHOTONIC LIQUID CRYSTAL FIBERS

The paper discusses polarization phenomena occurring in highly birefringent (HB) solid-core photonic liquid crystal fibers (PLCFs) based on the commercially-available HB Blazephotonics photonic crystal fiber (PCF) and a high-index-glass PCF manufactured by the Institute of Electronics Materials Technology ITME (Poland), both infiltrated with liquid crystals (LCs). We report on the latest experimental polarization characteristics of the host PCFs filled with prototype guest nematic LCs characterized by either extremely low (of the order ~ 0.05) or medium (of the order ~ 0.2) material birefringence. Due to anisotropic properties of the microstructrured PLCFs switching between different guiding mechanisms due to electrically and/or temperature-induced dynamically tuned birefringence has been demonstrated. These results hold great potential for both fiber-optic sensing and in-fiber polarization mode dispersion control and compensation.

Doris Bao, Luca De Vito, Daniele Domenico Napolitano
DSL INTEROPERABILITY TESTING LABORATORY

Equipment interoperability is a key factor for the development of Digital Subscriber Line (DSL) technologies and services. The paper describes the efforts of TLC Sannio Testing Laboratory in acquiring knowledge and competences for the validation of DSL equipment against standard requirements.

Luca De Vito, Daniele Domenico Napolitano, Sergio Rapuano, Maurizio Villanacci
INTERFERENCE SENSITIVITY OF AN AUTOMATIC MODULATION CLASSIFIER

In this paper, the experimental evaluation of the prototype of an automatic digital modulation classifier, carried out in a shielded chamber, is described. In this particular environment, immune to external interference, the prototype has been tested against different types of out-of-band RF interfering signals, in order to assess its robustness. The results present good success percentages with a small reduction, in comparison with those achieved in absence of interference.

Niclas Björsell, Pasquale Daponte, Luca De Vito, Sergio Rapuano
AUTOMATIC SIGNAL RECOGNITION FOR A FLEXIBLE SPECTRUM MANAGEMENT

The paper presents the prototype of an automatic digital modulation classifier, to be used for signal recognition in frequency bands managed in a flexible way. The prototype is based on a Data Acquisition System, consisting of an Analog-to-Digital converter embedded in an evaluation board, a frame grabber and a Personal Computer. The modulation classifier is able to recognize the most used digital modulations. An experimental validation of the realized prototype in a radio environment is also provided.

Sergiej Taranow, Yurij Tesyk, Oleh Karasinskij, Stanislava Pronselev
CALIBRATOR OF ALTERNATIVE VOLTAGE BASED ON THE METHOD OF REPRODUCTION OF VALUE OF DIRECT VOLTAGE

Passing of exactness from the source of direct voltage to the source of alternative voltage is widely used in measuring technics. Well known method is grounded on the usage of thermoconverter of voltage. There are some drawbacks of this method. The new method of reproduction of alternative voltage value is proposed. It is based on the use of properties of inertia of links of the parallel-resonant circuit for the direct passing of exactness of amplitude of signal from direct voltage source to alternative voltage source. The paper illustrates the mechanism of acting of calibrator of alternative voltage based on proposed method of reproduction.

Antonio Cataliotti, Valentina Cosentino, Alessandro Lipari, Salvatore Nuccio
ON THE CALIBRATION OF REACTIVE ENERGY METERS UNDER NON SINUSOIDAL CONDITIONS

This paper is focused on the problems related to the calibration of the reactive energy meters on the place of installation of the electricity meter (on-site), using the load of the same electrical system. In the presence of harmonic distortion, the behaviour of the meters can go out of the limits imposed by the theoretical calibration curve, depending on the metric used by both reference standard meters and meters under test.

Page 716 of 977 Results 7151 - 7160 of 9762