Showing papers in "Measurement in 2001"

TL;DR: The fuzzy approach proposed consists of representing measurements by a family of intervals ofconfidence stacked atop one another, that in fact define the upper bound of the probability distributions consistent with these intervals of confidence.

TL;DR: In this article, a method is presented for assessing geometrical errors of multi-axis machines based on volumetric three-dimensional length measurements, which can be used for software error compensation techniques in order to improve the machine's positioning behavior as well as for diagnostic purposes.

TL;DR: In this paper, the authors employed a suitable time-frequency representation (Wavelet Transform or Short Time Fourier Transform) to extract the envelope of reflected pulse echo, together with a suitable pulse detection algorithm (threshold or correlation) for time-of-flight estimation.

TL;DR: In this paper, a trapezoidal shape is used for time and/or pulse-height spectra measurements from high counting rate sources, which commonly implies pulse pile up, and the amplitude-arrival time measurement of piled up pulses by the trapezoid shape is simpler than by both maximum likelihood and least squares estimators, or adaptive nonlinear least squares methods which give better results in the case of severe pile up.

TL;DR: Two different approaches to measurement system development are compared — the first is based on the commercially available environment labview, and the second, widely used in the research field, isbased on the object-oriented programming.

TL;DR: In this article, the main formulas permitting to analyse the limiting metrological performances of some varieties of the dependent count method are reduced, and the static and dynamic errors of measuring instruments based on the offered methods are researched.

TL;DR: In this article, a modular in-line observation system (MILOS) is presented for process visualization and quality control of hybrid micro-systems with optical and mechanical functions.

TL;DR: In this paper, the authors proposed a separation of tooth flank topography into three global form deviations, that is, the 0th, the 1st and the 2nd order form deviations and the residuals.

TL;DR: In this article, the main parameters of recently developed flux-gate and search-coil magnetometers are discussed and the estimation of the noise level of both types of magnetometers is made and recommendation for choice of ELF band is given.

TL;DR: This paper proposes a GA based on the perceiving information about the dynamic environment, called a Perception-Based GA (PerGA), and applies the proposed method for acquiring collision avoidance behaviors of a mobile robot in a dynamic environment.

TL;DR: In this article, a simple methodology is presented for the determination of inertial mass properties of odd shape bodies, based on a modified torsional pendulum, the experimental procedure and error estimation for measuring principal and products of moments of inertia of mechanical systems.

TL;DR: The method has shown its robustness of object recognition with the surface-strips model, in spite of the noises in the scene, and has been verified through experiments using real-world raw-images.

TL;DR: In this article, the straightness motion error of a precision linear slide for the purpose of active error compensation (AEC) was measured by subtracting the profile data from the output of a displacement sensor.

TL;DR: In this article, a stereo vision approach has been adopted in order to dynamically recover the bottom characteristics of a vertical cylinder placed in a sandy bed and exposed to waves, and some morphological parameters of the scour such as the maximum scour depth, the extension of the eroded area and the position of the maximum Scour toe were measured at equilibrium condition.

TL;DR: In this paper, the authors present an experimental method to perform tests on compact fluorescent lamps operated with distorted voltage waveform conditions using an arbitrary waveform generator and a multifunction card.

TL;DR: In this paper, a new in situ absolute calibration method for a displacement sensor is proposed, and a calibration system is developed, which is capable of determining not only the linearity error but also the mean sensitivity on the base of the wavelength.

TL;DR: In this article, the authors deal with the dynamic correction of a thermometer for atmospheric measurements, which is the one launched onboard the Huygens probe of the Cassini mission.

TL;DR: Numerical experiments and comparison with methods taken from literature show that the new algorithm for fast determining the first zero crossing point over an interval is fast, reliable, and stable to high levels of noise.

TL;DR: In this paper, the effects of CMM measurement error on form tolerance estimations have been classified into three categories: (1) the effect on the least squares (LS) substitute geometry estimation, (2) the impact on the LS tolerance zone estimation, and (3) the influence on the Minimax tolerance zone estimator.

TL;DR: In this paper, the authors presented the results of the IMEKO XV World Congress in Osaka/JP and gave insights into the topic of measuring the average volume flow with ultrasound based flow meters in a pulsating fluid.

TL;DR: In this paper, the authors compare the WBGT index with other dynamic parameters for transversal flow in the common measurement range and compare the results experimentally by varying the thermal and fluid dynamic parameters.

TL;DR: In this article, a single-mode fiber-optic sensor is presented based on the principle of beam reflection to implement the digitizing of complex surface shape, which can compensate for the offsets caused by fluctuations of surface reflectivity and light power and is fit for application under rough and formidable conditions with noncontact, fast shape measurement.

TL;DR: In this paper, the geometrical parameters of a micro-hardness indenter can be obtained only if the scanning force microscope has been calibrated, and the evaluation of the indenter geometry is described according to two methods: on the one hand the determination of the plane angle, tip radius and length of line of junction in the microhardness range and on the other hand the calculation of area functions which are suitable for the nanohardness range.

TL;DR: In this article, the authors tackle the design of a calibration using experimental design techniques, in particular, the optimum calibration plan for measurement chain is identified by suitably elaborating the error propagation law suggested by the ISO Guide.

TL;DR: In this article, a complementary approach is suggested based on the empirical observations of James Clerk Maxwell and approaches to pragmatic linguistics involving intentional system behaviour, which stem from a famous discussion of meaning in 1955, by H. P. Grice.

TL;DR: In this article, a class of critical nozzles, shaped according to the recommendation of the ISO Standard 9300, was selected for the present study and the flow in the nozzle was investigated numerically and experimentally, making a validation of the results by direct comparison possible.

TL;DR: This paper develops a solution where the numeric processing is performed locally by the sensor, and where fuzzy processing is exported towards another computing resource by means of the CAN network.

TL;DR: An integrated hierarchical formal four-level structure which allows description of the multiple heterogeneous properties of a complex object under measurement is developed in order to have a uniform tool for the selection of specific scales for the measurement of these properties.

TL;DR: In this article, the authors report three different approaches to variable speed drive characterization: performance testing in static and dynamic working conditions and EMI analysis, and propose a measurement station which is VXI-based both for VSD static performance testing and eMI analysis and uses a real-time special purpose instrument for dynamic testing.

TL;DR: In this paper, a comparison of the two temperature measurement techniques revealed a difference of 0.32 K at 1300°C and 0.54 K at 1445°C in the range of or below the individual uncertainties.