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Showing papers in "Measurement in 2004"


Journal ArticleDOI
TL;DR: In this article, it is shown that the direct consequences of the classical ergodic theorems for psychology and psychometrics invalidate this conjectured generalizability: only under very strict conditions-which are hardly obtained in real psychological processes-can a generalization be made from a structure of interindividual variation to the analogous structure of intraindividual variation.

1,344 citations


Journal ArticleDOI
TL;DR: In this paper, a theoretical formalism for this calibration method is derived, which is based on modelling the acceleration measurements as filtered noise, and the effects of numerical integration are included in the model.

170 citations


Journal ArticleDOI
TL;DR: In this article, the authors describe the methods used and focus on their implementation in such a universal software, which focuses on high-resolution digital fringe evaluation including phase stepping, Fourier domain evaluation as well as unwrapping techniques for regular and irregular fringe patterns.

131 citations


Journal ArticleDOI
TL;DR: In this article, the out-of-plane vibration response mode shape of a vibrating surface was measured by using a scanning laser Doppler vibrometer (LDV).

88 citations


Journal ArticleDOI
TL;DR: After presenting an original method for evaluating the uncertainty of images deriving measurements, some examples of practical interest are introduced and evaluated leading the reader to the understanding of related problems.

71 citations


Journal ArticleDOI
TL;DR: An impedance measurement technique based on the use of a personal computer, two digitizing channels and the application of four-parameter sine-fitting algorithms to estimate amplitude, phase, offset and frequency of the voltages across the impedance under measurement and of a reference impedance is described.

70 citations


Journal ArticleDOI
TL;DR: A new high-resolution time-interval measuring system implemented in the single field programmable gate array (FPGA) structure designed for light detection and ranging system and ultrasonic flowmeters is presented.

56 citations


Journal ArticleDOI
TL;DR: In this paper, some of the recently proposed inversion methods (both nonlinear and linearized) for two-dimensional imaging are reviewed and deterministic and stochastic approaches are discussed and the most specific features of these approaches are pointed out.

54 citations


Journal ArticleDOI
F. Russo1
TL;DR: Results of computer simulations show that the proposed approach performs significantly better than well-known nonlinear methods in the literature including state-of-the-art operators.

43 citations


Journal ArticleDOI
TL;DR: In this paper, a new procedure to perform four-parameter sine fitting is presented in a closed form, ready for standardization, which grants convergence of the algorithm, even in those cases where the traditional techniques tend to converge to local minimums of the error function.

41 citations


Journal ArticleDOI
TL;DR: New methods of fault localisation and identification in linear electronic circuits (two-port or multi-port type) based on bilinear transformations in multi-dimensional spaces are presented, with particular consideration of the 3D, 4D and 6D methods.

Journal ArticleDOI
TL;DR: In this article, a model of the velocity sensed by both a single laser beam and by a pair of parallel beams incident on a rotating shaft requiring three translational and three rotational co-ordinates to describe its vibratory motion is presented.

Journal ArticleDOI
TL;DR: This paper deals with the on-line measurement of the dimensional parameters of rubber gaskets in the automotive industry and tackles the problem of 3-D reconstruction, starting off with pairs of 2-D images of object shapes.

Journal ArticleDOI
TL;DR: In this paper, the acceleration input signal is derived from the interferometrically measured displacement signal by a subroutine for the low-noise estimate of the input acceleration.

Journal ArticleDOI
TL;DR: In this paper, the authors focused on the experimental evaluation of uncertainty sources in modal parameter measurement, when high-energy laser pulses are used to excite the vibration of the structure.

Journal ArticleDOI
Sansli Senol1
TL;DR: In this article, the authors identify the variability sources that lead to errors in the measurements made for the correct evaluation of whether the targeted quality standards are reached in quality assurance systems, as well as at re-establishing a model with designed experiments, by virtue of including laboratory factor as a measurement variability factor into the MSA studies.

Journal ArticleDOI
TL;DR: In this article, a simple home-made standard humidity generator (divided-flow system) was used for the testing of humidity sensors, which consists of dry flow devices and wet flow devices connected with a constant temperature mixing flow chamber.

Journal ArticleDOI
TL;DR: In this article, a simple and inexpensive optical displacement transducer is presented based on the use of fibre optics and luminous intensity modulation, which is a cheap alternative to commercial laser vibrometers for small amplitude vibration measurements.

Journal ArticleDOI
TL;DR: Fuzzy and interval theory models are proposed for describing some uncertainty components and two examples are presented in which a fuzzy specification of uncertainty is considered appropriate, one being the engineering measurement of sphericity and another one being measurement of computer security characteristics.

Journal ArticleDOI
TL;DR: In this paper, the need for accelerated curing of concrete in precast civil engineering components is discussed, and the techniques available to achieve this are presented, with particular emphasis on the use of direct electrical conduction.

Journal ArticleDOI
TL;DR: These algorithms ensure the maximally efficient suppression of quantisation noise and other noises of analogue part of an MP ADC with algorithmic forming of estimates codes of an input signal using extended conversion algorithms built on the basis of works.

Journal ArticleDOI
TL;DR: In this article, the analysis of factors affecting the small wavelength content of profile after measurement by stylus profilometer is presented, and the effects of tip radius size as well as the skid effect were analyzed in three-dimensional surface.

Journal ArticleDOI
TL;DR: In this paper, a five-axis scanning system integrated with a CMM, a structured-light sensor and a PH10M rotary head is proposed, which can index the sensor orientation by the rotation of PH10m automatically.

Journal ArticleDOI
J. Letosa1, J.S. Artal1, M. Samplón1, Antonio Uson1, Francisco Arcega1 
TL;DR: In this article, the uncertainty associated with the use of N-turn coils in calibration of clamp-type current meters has been estimated using the finite element method (FEM), and the effects of excentricity or rotation of the sensor with respect to the straight wire are also analyzed by FEM and measured at 50 Hz in our metrology laboratory accredited by European Cooperation for Accreditation (EA).

Journal ArticleDOI
TL;DR: A new definition of measurement is proposed: “Measurement is an empirical process, using an instrument, effecting a rigorous and objective mapping of an observable into a category in a model of the observable that meaningfully distinguishes the manifestation from other possible and distinguishable manifestations”.

Journal ArticleDOI
TL;DR: In this paper, a flow analysis around an annubar in a circular pipe has been carried out using computational fluid dynamics (CFD) code, "FLUENT", to establish the effect of body shape on the ANNUAR factor.

Journal ArticleDOI
TL;DR: A novel framework for the automated identification of colon cancer precursors based on the processing of color video frames acquired during endoscopy is proposed, which has proven to provide high discrimination of image regions corresponding to normal and abnormal tissue.

Journal ArticleDOI
TL;DR: The architectural design of a measurement system for remote sensing, based on ‘ad hoc’ Wireless Local Area Network (WLAN) concept is proposed, whose characteristics allow simple implementation, without preventing advantage being taken of the processing gain associated with the waveforms.

Journal ArticleDOI
TL;DR: In this paper, a method for measuring the crack length in nonconductive materials was developed and is shown to provide a very accurate method to measure the length of cracks in conductive materials.

Journal ArticleDOI
TL;DR: A high performance NEural MUlticlassifier System (NEMUS) is presented, which combines multiple classifiers that operate on different feature sets and is characterized by a great degree of modularity and flexibility and is very efficient for demanding and generic pattern recognition applications.