Showing papers in "Measurement in 1993"

TL;DR: In this article, a flexible sensor array has been developed for the measurement of contact stress distribution between flexible bodies, which incorporates 960 contact geometry modulation resistive (CGMR) transducers to provide a spatial resolution of 10 mm × 10 mm.

TL;DR: The proposed technique allows the user to avoid time-consuming interpolation algorithms after computing the tapered DFT of an observed stretch of time-series by using specialized cosine flat-top data windows, which perform tapering with a very low amplitude degradation owing to their main-lobe flatness across a frequency range equal to the DFT bin width.

TL;DR: In this article, the basic principles of dual-wavelength radiation thermometry were introduced to show their utility in inferring temperature and investigate the influences of time-at-temperature and temperature on the emissivity behavior of selected aluminum alloys in their processing conditions.

TL;DR: An improved sequential method for data reduction which can control the distance between input and output data is proposed which makes it possible to accept a large amount of data in a small-size system.

TL;DR: From the fundamental requirement specifications the KBS can generate a number of different combinations of physical subsystems which satisfy the requirements of an instrument designer at a power flow level of representation.

TL;DR: In this article, the behavior in air of K and N thermocouples of the bare-wire and metal-sheath types is examined in the 0°C to 850°C range.

TL;DR: The human specification creation process is examined and how it can be systematised into an algorithm, applicable to either manual or computer-assisted measuring instrument requirements specification formulation.

TL;DR: In this article, the theory of an automated image processing technique using the temporal phase stepping method for moire interferometry is presented and applications of this technique on composite specimens are shown to provide a fast and accurate whole-field strain measurement.

TL;DR: In this article, the ability of visual inspection and optical testing to detect and compare the results with a destructive test of the components in the case of glass-fibre-reinforced plastic (GRP) tubes was investigated.

TL;DR: In this paper, a temperature compensation method based on an adaptive noise cancellation concept was proposed for bridge circuits, which includes voltage-to-frequency conversion of the bridge output, with little or no prior knowledge of interfering signal characteristics is required.

TL;DR: In this article, a surface is interpolated between data derived from 3-D metrology and limit surfaces are computed that bound a region of space containing the known data and the most probable interpolation of the missing data of the surface.

TL;DR: In this paper, a new infrared microthermograph system (spectral range: 8-14 μm) that features an emissivity correction procedure applied to the measured radiation pattern is presented.

TL;DR: In this article, an optical-fiber fire detection system is described, which consists of temperature and smoke sensors interrogated by a time division multiplexing (TDMM) technique, and the system is configured as a network that can be easily expanded.

TL;DR: In this paper, an interferometric technique, digital speckle pattern interferometry (DSPI), is used to measure anisotropic material properties and a series of strain analyses have been carried out to yield directional characteristics curves of the coefficient of thermal expansion and qualitative investigations of composite structures proved useful for material understanding.

TL;DR: The objective of this knowledge-based system is the entire process of designing electronic circuits including determination of the appropriate circuit configuration, component selection and value calculation, specification of circuit layout, simulation of circuit operation, and automatic design of an appropriate printed circuit board layout.

TL;DR: In this article, the present status of electrical measurement and instrumentation and the trends in this rapidly developing field are discussed, focusing on the increase of accuracy and stability of reference sources, application of digital instrumentation, microelectronics, computers and measurement systems.

TL;DR: Accuracy tests of a automated inspection of printed wiring assemblies based on the measurement of known artifacts which simulate the geometry of typical solder joints are presented.

TL;DR: The possibility of embedding fiber optic sensors into advanced composite materials to simulate a rudimentary nervous system represents one possible approach by which the surrounding environment and structural integrity of a composite structure might be monitored in real time as mentioned in this paper.

TL;DR: In this paper, two types of optoisolators of specialized construction are introduced, one is a LED-photoresistive Optoisolator and the other is an incandescent-photoregressive element.

TL;DR: In this article, a measurement technique designed to overcome such problems is given, together with an outline description of an instrument which uses the technique, and the results provided by the instrument from tests carried out both in the laboratory and on actual structures.

TL;DR: In this paper, it was shown that under dynamic conditions the frequency measuring chain may be treated as a really averaging one, the period measuring chain only as an approximately averaging one and in both cases averaging is not sufficient to eliminate the aliasing error.

TL;DR: In this paper, the authors present a method for the measurement of air bearing parameters, such as load-capacity and stiffness, by using the electrical capacitance between the bearing planes, which is suitable to measure the dynamic behaviour of the air gap (e.g. oscillations can be determined in real-time).

TL;DR: In this article, it is shown that a reasonable theoretical model must be of the second degree, but also that a second-degree model is sufficient, and that a calibration with pure force and moment components and pairs of components in turn is enough for permitting evaluation of a balance coefficient matrix.

TL;DR: In this paper, the transient thermal impedance can be approximated by asum of exponential functions, and it is shown that if the approximation curves do not pass through the measured points, it has probably been inaccurately determined.

TL;DR: A dedicated low-cost computer-controlled system for efficient, automatic evaluation of the fundamental characteristics of solar cells that carries out accurate measurements combined with relatively high-speed data processing to perform more reliable evaluation with less manpower.

TL;DR: In this paper, the use of interferometric techniques to study composite material deformation under impulsive loading is reviewed from an information sampling viewpoint, particularly in regards to the spatial resolution of the method and the amount of data that can be stored over an event.