Some problems concerning the lever arm length in torque metrology

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Engineering Information Abstracts (Part II)

grated circuit manufacture; Power amplifiers; Microwave antennas; Waveguide attenuators; Microwave oscillators Title: MODULATED PROBE ARRAYS FOR RAPID ANTENNA TESTING PRINCIPLES AND APPLICATIONS Author(s): Bolomey, J.Ch. Corporate Source: Supelec, Gif-sur-Yvette, Fr Source: Revue HF Tijdschrift n 2 1997. p 35-46 CODEN: RVUHAF ISSN: 0035-3248 Publication Year: 1997 Abstract: This paper reports significant advances achieved in the area of rapid antenna measurements during the last two decades. While near-field techniques were more and more well recognized in the antenna testing practice, their rapidity has been dramatically increased thanks to the use of probe arrays. Initially, the probe array concept was considered as purely utopic, but its feasibility is now demonstrated. Indeed advanced prototypes have shown that rapid and accurate near field measurements are now feasible. More particularly, the Modulated Scattering Technique has allowed to develop relatively low-cost equipment, not only for antenna metrology, but also for non destructive testing applications. In this paper, the different possible architectures of probe arrays are successively considered and some applications where rapidity constitutes a stringent requirement are reviewed. Possible improvements and expected developments are analyzed in the conclusion. ŽAuthor abstract . 38 Refs. In English EI Order Number: EIP97073749226 Keywords: Probes; Antennas; Directional patterns Žantenna .; Electromagnetic wave scattering; Electromagnetic field measurement; Nondestructive examination Title: MOLD MAKING AND MOLD DESIGN Author(s): Wigotsky, Victor Source: Plastics Engineering v 53 n 6 Jun 1997. p 24-28 CODEN: PLEGBB ISSN: 0091-9578 Publication Year: 1997 Abstract: The increasingly sophisticated technologies of modern mold design and manufacturing belie the suggestion that it is a tedious, stuffy industry. In reality, moldmaking is immersed in computerization, materials development for improved thermal conductivity and wear, and new standards of metrology. The need for process-specific tooling and constant competitive pressure add to escalating customer demands. Its effective response to these demands places moldmaking totally in the mainstream of the plastics industry’s global dynamics. In English EI Order Number: EIP97073735654 Keywords: Plastic molds; Manufacture; Plastics industry; Automation; Standardization; Computer aided design; Computer aided manufacturing Title: CAPACITIVE 4-TURN ANGULAR-POSITION SENSOR Author(s): Brasseur, G. Corporate Source: Technical Univ Vienna, Vienna, Austria Conference Title: Proceedings of the 1997 IEEE Instrumentation & Measurement Technology Conference, IMTC. Part 2 Žof 2. Conference Location: Ottawa, Can Conference Date: 19970519-19970521

Source: Conference Record - IEEE Instrumentation and Measurement Technology Conference v 2 1997. IEEE, Piscataway, NJ, USA,97CH36022. p 1262-1266 CODEN: CRIIE7 Publication Year: 1997 Abstract: A robust capacitive 4-turn angular-position sensor for automotive and metrology applications is presented. The main advantages of this low-cost system are its simplicity, speed, high accuracy Ž plus or minus 0.35 degree . and resolution Ž plus or minus 0.02 degree . over the absolute measurement range of more than plus or minus 720 degree , compact sensor outlines, and insensitivity to dirt or condensation. The paper describes the working principle, derives the required relationships for computing the angular rotor position, and discusses measurement results obtained from a prototype sensor with small outlines Ž50 mm diameter and 8 mm thickness . used as a steering sensor in vehicles. ŽAuthor abstract . 10 Refs. In English EI Order Number: EIP97073730911 Keywords: Sensors; Tracking Žposition.; Angle measurement Title: SOME PROBLEMS CONCERNING THE LEVER ARM LENGTH IN TORQUE METROLOGY Author(s): Roeske, Dirk Corporate Source:Physikalisch Technische Bundesanstalt, Braunschweig, Ger Source: Measurement: Journal of the International Measurement Confederation v 20 n 1 Jan 1997. p 23-32 CODEN: MSRMDA ISSN: 0263-2241 Publication Year: 1997 Abstract: When static torques are realized with the aim of backing up this physical quantity from the metrological point of view, due regard must be given to some aspects of the highly accurate determination and the constancy of the lever arm length. This paper shows, on the basis of numerical calculations and measurements, how reference points can be defined which are decisive for the lever arm length. In addition, reference is made to two effects related to the elastic deformation of the lever, and a description is given of how their influence on the uncertainty of measurement can be reduced. ŽAuthor abstract . 2 Refs. In English EI Order Number: EIP97073721827 Keywords: Torque measurement; Torque meters; Deformation; Machine design Title: MASS METROLOGY AND MAGNETISM Author(s): Myklebust, Thor Corporate Source: Norwegian Metrology and Accreditation Service, Oslo, Norway Source: Measurement: Journal of the International Measurement Confederation v 20 n 1 Jan 1997. p 13-21 CODEN: MSRMDA ISSN: 0263-2241 Publication Year: 1997 Abstract: Magnetic interaction between weights and mass comparatorsrweighing instruments may lead to errors in mass metrology. How to test the important magnetic properties of weights and mass comparators are presented. Some results from our tests using different methods are given. In addition requirements for weights, mass comparators and the laboratory are presented. ŽAuthor abstract . 18 Refs. In English EI Order Number: EIP97073721826