Showing papers in "Measurement in 1990"

TL;DR: The results obtained on different standard deadweight machines of five European National Standard Laboratories within a campaign promoted by the Bureau Communautaire de Reference (BCR) were determined by means of the IMGC 6-component dynamometer as mentioned in this paper.

TL;DR: The initial stages of the development of a knowledge-based system (KBS) for the design-concept generation of instruments implements a convergent method for the generation of a range of alternative concepts.

TL;DR: In this paper, a CCD-array camera and a vision system monitor flank wear of HSS-drills in the tool magazine of a production centre and show high reproducibility and reliability, and a strong correlation between the flank wear and the tool-life of the drill.

TL;DR: The state of development of the concept and the first generation software developed to implement it are presented and suggestions for such an interface are discussed.

TL;DR: Application of the presented method can be useful in constituting the process of hierarchy of accuracy for measuring systems intended for dynamic measurements.

TL;DR: In the note the alternative framework, recently proposed by the Italian Standard (UNI 4546, 1984), based on the concept of ‘intrinsic uncertainty’, is recalled and the related restitution procedures are discussed, with explicit reference to a probabilistic formulation.

TL;DR: In this paper, the spectral emissivity of a range of metal and non-metal solid materials has been measured on two NBS standard reference materials and some preliminary measurements on bare or coated V-grooved specimens of aluminium are also reported and the results compared with a theory that assumes perfectly specularly reflecting surfaces.

TL;DR: In this article, a mineral-insulated metal-sheathed (MIMS) thermocouple with Nicrosil and Nisil type N thermoelement conductors and a novel nickel-base sheath alloy Nicrobell was proposed.

TL;DR: In this paper, the authors focused on Ge photodiodes as transfer standards covering the complete spectral range of interest, including the optical windows of fibre-optical communication at 850, 1300 and 1550 nm.

TL;DR: A methodology for designing sensing interfaces is reported that is based on initial externalisation of the rules forming the knowledge needed of a multi-sensor observable circumstance, and the rule set is used to select and combine the sensors to produce a closely minimal sensor system.

TL;DR: In this paper, the total power and luminous flux measurement of light-emitting diodes using new designs of integrating sphere photometers was studied. But the authors focused on the total energy and luminosity measurement of the diode and did not consider the integration of small more efficient spheres.

TL;DR: The long-term performance of the transfer standard pyrometer developed at the Istituto di Metrologia "G. Colonnetti" was evaluated by: 1) testing a calibration technique; 2) assessing the capability to maintain the high-temperature scale in comparison with high-stability tungsten strip lamps; 3) checking the absolute stability of the instrument as discussed by the authors.

TL;DR: In this article, an indenter is made to penetrate the tested material, a linear dimension of the indentation is measured, and the hardness value is calculated by agreed formulae from the measured dimension.

TL;DR: Three approaches for the computer-assisted generation of monitoring strategy and the programming of complex monitoring systems are outlined and pattern-recognition-based learning, offline simulation of machining for monitoring purposes and a programming advisor expert system are illustrated.

TL;DR: In this article, the authors present five methods of technical diagnosis of electric drive systems, involving diagnosis from static or transitional measurements, monitoring the vibration or current spectra, and parameter estimation.

TL;DR: Methods for functional mapping of spatio-temporal data are described: functional maps of parameters and maps of the spatial organisation of system functions.

TL;DR: The measuring system described is like an electronic theodolite for short distance measurement, using computer vision, based on semiconductor CCD sensors, in the hardware and software way.

TL;DR: In this article, a new approach has been proposed that requires the calibration of the complete high voltage Measuring System in comparison with a Reference System made traceable to National Standards by a Metrological Authority.

TL;DR: The importance of reliability diagnostics in early planning and design stages is emphasised in this article, where three possible methods are: failure rate analysis; failure mode, effect and criticality analysis; and fault tree analysis.

TL;DR: In this article, a method for the formal definition of quantities close to the notion of power is presented, where nearlyperiodic and periodic non-sinusoidal waveforms are considered as particular cases.

TL;DR: In this paper, a continuous constant-an-wire thermopile was developed especially for the microcalorimeter, which exhibits a better linearity at the limits of experimental detection.

TL;DR: In this article, an experimental evaluation of displayed CRT images after digitization of analogue medical radiographs was carried out by obtaining ROC curves based on signal detection theory, and the detectability was evaluated as the area under the ROC curve.

TL;DR: The possibility of using 'observers' in the output power for a class of drive motor systems is considered and the idea presented calls for transferring the standard power measurements made by analogue instruments to the A D power converters and computer.

TL;DR: In this paper, a method and an optical device have been developed for the spectral distribution measurement of optical radiation (OR), the measurement of the erythemal UV-irradiance and dose, and of the spherical erythmal irradiances and dose using only one instrument with a spherical photodetector.

TL;DR: In this article, a method for failure classification using the relationship between coefficients and poles and corresponding residuals of a transfer function as well as their dependence on various physical influences is proposed, and experiments show that poles and residuals used as features permit a better classification than the use of coefficients.

TL;DR: In this article, the authors show that no ideal working standard detector for low power levels is available, and that the best basis for radiometric calibrations is a set of primary standard detectors and primary standard sources.

TL;DR: In this paper, a system has been devised for automatic measurement of the temperature of coke as it is ejected from an oven following carbonisation, giving information on both the vertical and longitudinal temperature variations within the oven, and the measurements can be related to the positions of individual flues within the heating walls.

TL;DR: In this article, a mathematical correction of the dynamic measuring error associated with encapsulated heat flux sensors can normally be obtained by solving the inverse heat conduction problem, and an approximation using information theory is considered.

TL;DR: In this paper, a procedure for separating several ECD sources from dynamical magnetic maps of the human heart and brain is described, based on multidimensional optimisation with spatial and temporal regularisation.

TL;DR: The variance function as the standard deviation of the average function is well suited as a diagnostic tool to monitor mechanical movements by detecting nonlinear effects during the movement using touch-induced or rub-induced vibrations.