Showing papers in "Measurement in 2000"

TL;DR: In this paper, the advantages of machine vision as an direct measurement technique are discussed, including quality of measurement results, integration close to the machine, tool handling and advanced techniques of adaptive illumination for obtaining optimized camera images.

TL;DR: In this paper, the average temperature of the flame field is calculated from the ratio of averaged grey levels of the two images alternatively captured at two different wavelengths, and a pseudo-instantaneous temperature distribution is obtained from a single-wavelength image and presented by pseudo-colour.

TL;DR: The problem of evaluating the uncertainty that characterises discrete Fourier transform output data is dealt with, using a method based on a ‘white box’ theoretical approach, which can be particularly useful for any designer and user of DFT-based instruments.

TL;DR: In this article, the distinction between exact and uncertain measurement is formalized in terms of the properties of the traceability chain joining the measuring system to the primary standard and the consequence is drawn that uncertain measurements lose the property of relation-preservation, on which the very concept of measurement is founded according to the representational viewpoint.

TL;DR: Radial basis functions networks (RBFN) are used to process circuit input–output measurements, and to perform soft fault location, and results show that the developed nets succeeded in classifying faults.

TL;DR: In this paper, a multisensor fusion approach was used for water quality monitoring using an artificial neural network (ANN) algorithm to estimate global pollution parameters in water samples, particularly Chemical Oxygen Demand (COD).

TL;DR: Electrical impedance measured between suitably placed electrodes can give a reasonable amount of information about the basic physiological parameters of the patient’s body and its organs and vital systems.

TL;DR: In this article, a diagnostic system based on laser vibrometers and acoustic stimulation of structures has been developed for the inspection of detachments and delaminations in frescoes and icons.

TL;DR: Computer vision techniques developed for an automatic calibration system that can automatically determine the reading of the measuring instruments even if they do not have a digital interface that enables the computer to communicate with it.

TL;DR: In this article, a method of surface myoelectric (ME) signal measurement and analysis, with the aim of evaluating muscle fatigue during cyclic dynamic contractions of quadriceps muscle (lower leg extension and flexion exercise on ‘leg-extension’ training device), was developed.

TL;DR: In this article, the authors analyzed the feature of that procedure by a simple mathematical model and proposed a profound selection of the fitting range, the fitting function, and the extrapolation function.

TL;DR: In this article, the authors demonstrate that the dynamic range of a single monolithic laser transducer covers at least 9 decades in which the output frequency is strictly proportional to the input force magnitude.

TL;DR: In this article, the authors describe how laser interferometry can be used to respond to the increasing demands from industry and elsewhere that the traceability of vibration and shock measurements to SI units be established or improved.

TL;DR: In this article, the effect of windowing on the variance estimate computed based on a power spectral density estimate is analyzed experimentally and four different window functions are studied in order to find out their effect on periodogram-based variance estimates.

TL;DR: In this article, a non-invasive measurement procedure for the diagnosis of structural defects on human teeth based on noncontact excitation and measurement of vibration by laser techniques is proposed and analyzed.

TL;DR: In this paper, a digital signal processing method for reliable analysis of ultrawide-band detected partial discharges (PD) current signals is proposed, exploiting the multiresolution approach peculiar to the Wavelet Transform, is capable of setting the detected signal free from most disturbances affecting its true shape, thus ensuring the significance of the measurements carried out on the signal itself.

TL;DR: In this paper, an experimental investigation of the scour process that arises at the base of a vertical cylinder placed in an erodible sandy bed, in the presence of an oscillating flow, is presented.

TL;DR: In this article, a telemetry system for real-time force measurement in the legs and crutches or cane is presented, which provides a quantitative gait analysis of orthopaedic patients.

TL;DR: Experimental and simulation results concerning the characterization of a 12-bit PC acquisition board and an expression of tolerance interval as a function of the number of samples acquired given a certain confidence level are presented.

TL;DR: In this paper, a highly accurate pipe length on-line measurement with acoustic sensor is considered, where stationary waves in straight pipes are modeled with a finite-dimensional linear dynamic system including unknown parameters, and pipe length measurement is obtained by taking expectation of the candidates.

TL;DR: In this article, the U.S. federal government has a strong role in metrology R&D and the payoffs of good planning and resource deployment come in the form of anecdotal examples of significant industrial outcomes and comprehensive evidence of impacts through formalized studies.

TL;DR: In this article, a method for the calibration of the horizontal and vertical scanners in a laser Doppler vibrometer is described, and the residual of the scanner position with respect to a first-order and second-order regression model is discussed.

TL;DR: In this paper, a simple high-sensitivity interferometric technique of detecting vibrations and present characteristics of laser vibrometer using GaAs and SnS2 adaptive photodetectors based on the effect of the nonsteady-state photoelectromotive force.

TL;DR: Dithering is being used for elimination quantization error and other small scale errors of A/D converters, and the prediction of metrological reliability of the dithered AD converter cannot be simply made.

TL;DR: In this paper, the influence of a 90° mitre bend/reducer combination on the performance of two geometrically similar electromagnetic flowmeters has been investigated, the pair of electrodes for each meter being 7.667 diameters downstream of the reducer's exit.

TL;DR: In this article, an original formulation of the deterministic model of nonuniform sine wave quantization is presented, where the mean value, the fundamental frequency component and the harmonics of the quantization error are analytically evaluated as functions of the sine-wave parameters and quantizer characteristics.

TL;DR: In this paper, the accuracy of the chosen, approximate methods of evaluation of expanded uncertainty most often used for a simple, direct measurement when there are two standard uncertainties and the sample is small.

TL;DR: In this paper, a technique based on a laser vibrometer is examined for the vibration measurement of bodies with fluids between the measurement point and vibrometers head, and the causes of uncertainty have been correlated with the optical characteristics of the various fluids employed and with their thickness.

TL;DR: In this article, the results of the field tests carried out on two different types of static ultrasonic flow meters for 2 years were reported. But the results were limited to the use of static innovative flow meters.

TL;DR: In this article, the power loss and phase distortion properties of a focused laser beam penetrating long microbores have been investigated using a single lens and double lens laser beam shaping system.