Showing papers in "Measurement in 1995"

TL;DR: Speckle pattern and shearing interferometry are becoming more and more important in the areas of precision measurement and nondestructive testing as mentioned in this paper. But they are not suitable for non-destructive testing.

TL;DR: In this paper, an absolute interferometrical distance measurement technique using a tunable semiconductor laser which, by virtue of its external cavity, has extremely small linewidth and, therefore, considerable coherence length, is discussed.

TL;DR: In this paper, different arrangements for digital double-pulse holographic and speckle interferometry for vibration analysis are described, and applications of the method for measuring rotating objects are discussed, together with the derotator needed.

TL;DR: In this paper, an efficient global optimization algorithm enabling to find the first root from the left of an equation o(t) = 0, where t ϵ [a,b], o(a) > 0, is presented.

TL;DR: In this paper, the behavior of electronic compensated current transformers is examined with reference to a model valid for frequencies ranging from industrial to ultra-acoustic both in steady-state and in transient conditions.

TL;DR: In this article, the determination of flow meter calibration factors has been made using a computer simulation approach based on computational fluid dynamics (CFD), which is used to determine the flow field in a flow meter as developed by three different pipe configurations.

TL;DR: In this paper, a 3D electronic speckle pattern interferometer was adapted to the testing machine for measuring the spatial displacement field at the surface of the cruciform wooden specimen. But this measurement was performed in a single step and at each step three interferograms were taken.

TL;DR: In this article, a laser scanning vibrometer was used to measure the contact force between the hand and the vibrating surface of a hand-arm transmitted vibration, which can be applied in laboratory tests and also to perform field tests on hand-guided vibrating tools.

TL;DR: A probabilistic interpretation is proposed that coherently models the uncertainty in the measurement of intensive entities and is related to the current standards, and the appropriate propositions are justified with examples.

TL;DR: The main goal of this paper is to define the boundaries between tasks and messages as well as between processors and networks, which are much different in practice but have strong similarities from the scheduling point of view.

TL;DR: In this article, a signal model for groove textures in gray level images of machined surfaces is proposed, which has a parsimonious set of physically interpretable parameters, which can be used asspecific feature set for objectively characterizing the essential geometric and statistic properties of groove textures.

TL;DR: In this paper, a low-cost and highly robust displacement sensor based on the Linear Variable Differential Transformer (LVDT) principle has been constructed in flat form in order to verify a certain system design mix of techniques.

TL;DR: An original non-invasive experimental procedure, based on two contiguous cuffs placed around the same upper arm and separately inflated, is developed, demonstrating the possibility of achieving a unique theoretical identificability of the elastic parameters with this procedure.

TL;DR: In this article, the problem situation related to the calibration and use of measuring instruments is addressed in general terms with reference to the ISO Guide to the Expression of Uncertainty in Measurement.

TL;DR: In this article, the authors present a technique to incorporate orientation measurement into a laser tracking system that requires only minor changes in the existing hardware, based on the analysis of an image of the reflected laser beam intensity distribution.

TL;DR: In this article, a signal theory approach is proposed to determine a sensor driving signal that enhances the sensor capabilities in stimulation-and-response-based measuring systems, based on signal theory.

TL;DR: In this article, the authors describe how unencapsulated silicon sensors are influenced by humidity and moisture of the ambient air and how these influences lead to instabilities in the output signal.

TL;DR: In this article, a simple parallel plane bracket mounted on the measuring end of a CMM probe is used to determine the centers of the balls automatically and accurately, and the exact distances between the balls can be obtained by using the coordinate measuring machine (CMM) probe motion.

TL;DR: The state-of-the-art in radiation-tolerant position sensing systems is reviewed in this paper, where linear/angular encoders, as well as non-contact sensors are first considered, followed by more complex sensors such as 3D cameras and laser systems.

TL;DR: In this paper, the authors describe the experimental setup used to measure the inertia tensor and the position of the centre of mass of unpredefined objects, which are some of the parameters necessary for the design of gripping devices and especially for a dynamic study of manipulation.

TL;DR: The proposed ultrasonic distance sensor is cheap and easy to be implemented, therefore enabling the design of low-cost, high-performance devices.

TL;DR: How the estimation accuracy of a smoothed periodogram can be improved by adopting flat-top tapering in conjunction with averaging of 75% overlapped time slices of the data sample, based on Welch's method is shown.

TL;DR: In this paper, a short survey of measurement sensors suitable and convenient for an in-situ evaluation of GHP performance as well as the related metrological analysis (overall uncertainty evaluation).

TL;DR: Quantitative analysis indicates that the design of the air cell and its configuration in the measuring arm is the focus for improving measurement uncertainty.

TL;DR: The main features which make this new thermometer particularly interesting for medical purposes are: ease of use, rapidity of results, safety, patient's and health provider's convenience.

TL;DR: In this paper, a diffraction grating interferometer for the accurate dynamic measurement of angular acceleration, angular velocity and rotation angle is presented, which can be used to measure translational motion quantities.

TL;DR: This method enables unexpectedly disturbed cameras to perform gaze control like the human vestibulo-ocular reflex (VOR) and the decomposition of a required task into subsystems and the reconstruction of a simple integrating system from them.

TL;DR: The aim of this paper is to define the application limits of Binary or digital encoders considering their optimal use, taking into account an adequate signal processing but also particular application conditions.

TL;DR: In this article, the authors investigated the stress and strain state on the edge of the interface of a bonded bimaterial beam under bending load by using moire interferometry and a localized hybrid method.

TL;DR: In this article, the authors describe the design of a new portable laser (MRI3) which has achieved a relative frequency reproducibility of 1.3 × 10 −11 during a period of one and a half year.