Showing papers in "Measurement in 1989"

TL;DR: In this article, a correlational gas analyzer, comprising a light source with the light beam passed through the gas under study with a quasiperiodic pattern of the spectral band, and an optical system with sequentially positioned along the lightbeam condensor, input slit iris, beam dispering element and rotatably mounted output slotted iris configured as a disc with a slit shaped as an Archimedes spiral.

TL;DR: In this article, a prototype of a Coriolis mass flow meter is presented, which is composed of two attached elements: a stiff tube and an original system of independent elastic suspension which lets the whole sensor vibrate.

TL;DR: In this article, a continuous annealing furnace temperature was measured using radiation thermometers aimed, at a shallow angle to the strip, into the wedge-shaped cavity formed between the strip and a roll.

TL;DR: A new trial of predicting the fluctuation of a stochastic acoustic signal by extracting the information on many correlation properties from its measured past data with the use of a generalised error evaluation criterion is described.

TL;DR: The size of source effect in a monochromatic optical pyrometer has been measured using a special source that provided radiance uniform to within ±2% over circular areas of up to 75 mm diameter as mentioned in this paper.

TL;DR: In this article, an analytical balance (capacity, 100 g; sensitivity, 100 div/mg) has been converted into a fully automated hydrostatic balance at the Istituto di Metrologia ‘Gustavo Colonnetti’ (IMGC).

TL;DR: An effect of the speed of low-cost, popular, personal computers' expansion on the architecture of instruments and measurement systems is discussed and new phenomena are described.

TL;DR: In this article, a transducer whose output voltage bears a linear relationship with temperature is described, and the thermistor is used as a temperature-sensing element in the design.

TL;DR: In this article, the arrangement of the polymeric chain axes affects the propagating light vector even in the case of a load-free subject, and some unloaded transparent polymers cause modulations that differ as the polarised monochromatic primary beam moves deeper in the material.

TL;DR: In this article, the authors describe automatic measuring equipment for studying the variation of induction motor characteristics with changing operating conditions, and the value of machine parameter estimation in representing the machine's behaviour is discussed, and different ways of modelling parameters are compared.

TL;DR: In this paper, the relationship between the sensitivity of a column load cell to endloading conditions and the aspect ratio of the column is described for the particular case of axisymmetric non-uniform loading.

TL;DR: In this paper, a thermal model application for the determination of semiconductor device packaging quality is discussed and a method is presented for determination of a fault during a thermal test and "on-line" indication of the fault source.

TL;DR: A global overview is given of the present state-of-the-art of signal-processing software with special emphasis on developments in the field of computer-aided control system design (CACSD).

TL;DR: An overview is given and some conclusions are drawn for accuracy testing of computerised measuring instruments for the errors caused by computer and associated software.

TL;DR: In this article, the gallium cells and the ingots of indium and cadmium were exchanged between the two laboratories, where they were set up and re-measured, with each cell or ingot indicated agreement within a few tenths of a millikelvin between the NPL and VNIIM realisations of the International Practical Temperature Scale of 1968.

TL;DR: In this article, an auxiliary-source antenna system with magnetic dipoles at a known position, with its axis in three horizontal orientations, is used as reference source, and the co-ordinates of sensor position can then be calculated from field strength and field direction measurements at any sensor location for each of the three source orientations.

TL;DR: In this paper, Taube's whiteness index number W ∆ TA was determined for non-fluorescent white samples with a tristimulus colorimeter for the CIE 1931 standard colorimetric observer (2°), CIE illuminant C and white standard BaSO 4.

TL;DR: A new, one-shot type, ATE-oriented method of fast testing of some frequency characteristics in the low, or very low, frequency region is presented, based on shape-designed signals—so-called complementary signals.

TL;DR: Digital calculation of symmetrical components may be based on simple delay of input signals, but to avoid errors due to the distortion of signals, some kind of frequency filtering ought to be added.

TL;DR: A review of international co-operation in metrology matters is presented in this article, which includes discussion of legal metrology, accreditation, standardisation, publication and professional associations, as well as two other mechanisms, those of international consultancy and specialist academic centres, as is the need for professional registration.

TL;DR: In this paper, the authors report research into lasers and their applications in metrology carried out by the National Institute of Metrology in China, including stabilising methods for the beat frequency of a double-frequency laser, the use of a Zeman-effect laser for distance measurement, and a polarisation interferometer for calibrating an electronic indicator.

TL;DR: In this article, the problems to be considered for reliable testing and a brief overview of the methods are presented, as well as a survey of the most common methods for testing electrical and electronic components.

TL;DR: In this paper, it was shown that the position-sensitive photodetector examined is a measuring device with an accuracy of about 0.1 μm if it has been calibrated.

TL;DR: In this paper, a pseudoheterodyne signal processing scheme is presented which utilises two closely spaced single-mode laser diode wavelengths that operate in a common Fabry-Perot interferometer.

TL;DR: In this paper, a new method of solar cell spectral response measurement, having some advantages in comparison with conventional methods using monochromators, is presented, where a Fourier spectrometer is used with the purpose of measuring the spectral response of solar cells.

TL;DR: In this article, the rotational speed of the measuring piston was used as a parameter to limit the change of the active area of the instrument and thus limit the non-controlled temperature increment.

TL;DR: A computer system providing automatic analysis of the HPI, based on ECG data, has been developed and implemented on an IBM PC AT computer and uses a complex algorithm which enables the evaluation of all possible combinations of HPI events, and establishes for each of these combinations its correspondence to the specified pacemaker algorithm.

TL;DR: In this article, the application of pyroelectric detectors in pyrometry is conditioned by a number of advantages, such as the ability to be linear and comply with Talbot's law.

TL;DR: An architecture for adaptive real-time spectrum analysis of multi-frequency waveforms is presented and a new measurement algorithm for high-accuracy analysis in the frequency domain, which provides the basis for efficient adaptation.