Showing papers in "Measurement in 1999"

TL;DR: In this paper, a new method for the investigation of the dynamic characteristic of bridges has been developed, based on the photogrammetric principle; however, the viewing system is equipped with an additional reference system, which decreases the sensitivity to vibrations and an analysis system which enables image analysis.

TL;DR: In this article, an evaluation of various types and configurations of neural networks developed for the purpose of assisting in accurate flaw detection in steel plates was conducted using a wide range of samples including non-defective plates, side drilled holes, inclusions and porosity together with smooth and rough cracks.

TL;DR: In this article, three mathematical models depending on the method used to select the exact control points are constructed to evaluate the analytic solution of the minimum circumscribed circle, the maximum inscribed circle and the minimum zone circle by directly resolving the simultaneous linear algebraic equations.

TL;DR: In this paper, the deformation and wear of a pyramidal silicon-nitride AFM tip were investigated using contact mode scanning of silicon features of micrometre-size.

TL;DR: In this article, a digital signal processing method for automatic detection and measurement of transients is presented, which executes a time measurement first in order to estimate the duration of the transient and then, thanks both to the result of the time measurement and a suitable subband filtering approach, the transient is extracted from the waveform on which it is superimposed.

TL;DR: In this article, the authors present an on-line diagnostic system for mechanical quality control of household appliances based on the laser Doppler vibrometer technique and a laboratory measurement station for washing machines.

TL;DR: In this paper, an artificial neural network (ANN)-based smart capacitive pressure sensor, whose response characteristics can be estimated within an accuracy of ± 1% error over a wide variation of temperature starting from −50°C to 150°C.

TL;DR: In this paper, a measurement procedure aiming at a proper utilisation of the measurement method according to the characteristics of the selected application field is described, and the results obtained from the application of the method to thickness measurements by means of ultrasonics, power quality analysis as well as HV tests are presented.

TL;DR: The resulting dynamic integral nonlinearity of IADCs is analytically derived and a model based on a low-order polynomial function of the input signal slope and the output code is proposed, useful for reducing experimental burden related to dynamic metrological characterisation.

TL;DR: The work analyzes the various components of information brought by measurement results, in particular highlighting the meaning and the role of semantic and pragmatic information present in measurement.

TL;DR: The paper describes an automatic measurement system for the estimation both of geometrical and physical parameters of automotive gaskets and the metrological characterisation of the proposed system is given.

TL;DR: An approach for moire deflectometry based on Fourier-transform analysis is described in this article, where Fourier transform is used for analyzing and evaluating both infinite and finite moire deflectionograms.

TL;DR: Theoretical analysis and simulations for feature-based metrology in statistical ways directly imply that the basic concepts and data processing methods in this report are useful in estimating the uncertainty of measurement in coordinate metrology.

TL;DR: In this article, self-calibration measuring methods are introduced to improve the accuracy of impedance measurements according to the measuring system properties, and the measuring errors are self-corrected by special algorithms.

TL;DR: In this article, the authors consider the problem of spectral leakage when a non-integral number of periods is present in the sampled data set and propose a method to avoid spectral leakage by using coherent sampling.

TL;DR: It is shown that taxonomy provides the enabling key to defining the nature and scope of Sensor Science, and applied Classical Taxonomy to ordering in Sensor Science is shown to depend upon the cardinal link between humans and machines.

TL;DR: In this paper, a phase shifting technique is used for determining the strain distribution of homogeneous and inhomogeneous materials in a digital shearogram, and the results of the phase maps of the two shearograms are used to obtain the pure in-plane and out-of-plane components.

TL;DR: In this paper, the 1.5 μm ytterbium-erbium laser was extensively investigated in terms of its intensity and frequency noise characteristics, and the energy transfer process between Yb and Er ions in the codoped active material was shown to reduce substantially the intensity noise induced by pump power fluctuations.

TL;DR: In this article, a linear difference resonator in the form of x k+1 =ax k +by k, y k+ 1 =cx k +dy k was used to detect the characteristic frequency component contained in weak signals.

TL;DR: In this paper, a test chamber system was constructed and connected to a dew-point generator for the calibration of relative humidity hygrometers and dew point HOGs with an open sensor.

TL;DR: In this article, a new probe technique for nano-CMM using a laser trapped microsphere is proposed, which is based on the laser trapping technique and the microscope interferometer.

TL;DR: In this paper, an analysis of the dynamic behavior of an interferometric measurement system based on the counting technique with regard to the measurement errors due to deterministic and stochastic disturbing quantities is presented.

TL;DR: In this paper, a new method for fault detection and fault isolation of analog circuits is presented, based on the response of the circuit under test which is obtained by measuring the output voltage at an accessible node when a stimulus constituted by a signal with a particular test frequency is applied at its input.

TL;DR: In this paper, a self-calibration measuring method based on linear and quadratic interpolation is proposed for the measurements of transfer function and impedance of analogue circuits and systems.

TL;DR: In this article, a comparison between an axial vibrometer in conditions of ideal operation and tangential vibrometers operating on various surface states was carried out through a theoretic modelling of the interaction between this measuring system and the measurand, thereby providing a rational description of the phenomena observed.

TL;DR: In this article, a prototype integrated ultrasonic/vision sensor which uses an off-the-shelf CCD camera and an ultrasonic phased array sensor is described, which enables the camera to be calibrated using data from the ultrasonic sensor, to perform target detection and recognition and also to provide 3D measurement of target position and dimensions.

TL;DR: In this article, a self-referenced pattern projection method is proposed to measure objects under an illuminated environment and to measure colored objects, which is able to reduce the number of projections and reduce the unevenness of reflectivity of objects.

TL;DR: A new model has been proposed for the characterisation of the non-linear dynamic effects of a S/H-ADC device and a new mathematical approach has been introduced to describe its non-ideal dynamic behaviour.

TL;DR: The analyser implements a procedure, based on the wavelet transform, suitable for analysing those disturbances which affect the power supply voltage, which utilises a good performance digital signal processor and adopts the VXI standard interface.

TL;DR: In this article, a method of 2D phase-unwrapping by blocks is presented, which combines the advantages of both conventional phase unwrapping algorithm and cellular-automata unwrapping algorithm.