Vol 59, No 1 (2016)

The methods of construction, the structure, and the technical and metrological characteristics of the National Primary Standard for the unit of electrical power at frequencies of 1 to 2500 Hz, GET 153-2012, are described.

A method for qualification testing of satellite-communication earth stations is examined which provides parallel processing of data arriving from measurement equipment and an onboard relay system in a spacecraft. Results of tests of the time delay in the system response to operator inquiries as a function of the number of organized work sites are described.

We develop a high-speed digital algorithm for computing estimates of n^th order correlation function moments. The primary digital conversion used is the studied random process of analog-stochastic sign quantization.

A technique for adjusting a solar simulator using a combination two-channel radiation source is examined and the uncertainty in the calibration of the simulator is evaluated. The calibration procedure is based on the irradiance and the spectral irradiance of two standard photoelectric modules.

Acoustic signal frequency dependences were measured and theoretically calculated. A comparative analysis was carried out for measured (approximated using the Lorentzian function) and theoretically calculated dependences. It was shown that the difference between the shape of the maximum for the theoretically calculated frequency dependence and that of the conventional approximating function results in a shift of up to 1 mK in the measured absolute temperature.

Approaches to the development of methods for contactless thermometry are discussed on the basis of studies carried out over the time the primary standard of Ukraine DETU 06-03-96 has been in operation.

The operating principle and major causes of instability in strain-gauge pressure sensors under severe service conditions are discussed. New designs and technologies are proposed for high-sensitivity, thermally-stable, resistance strain gauges employing new materials. Technologies for increasing the stability of the parameters of these sensors are described.

We pose and solve the problem of using linear cyclic error-correcting codes in angular and linear displacement transducers with combinatorial code scales. It is shown that the formation of error-correcting codes can only be achieved by introducing redundancy in the number of reader elements without additional code tracks.

A new optoelectronic method of contactless measurement of the profile of the surface of large complexly shaped objects distinguished by a high degree of reliability and resistance to variations in the optical properties of the surface of objects over a broad range and to additive noise in the images is proposed. The method utilizes structurized illumination, phase triangulation, and identification of phase images with stepwise shift.

Designs of multichannel belt-conveyor weighers are considered. A technique for verification of such weighers using a reference load is presented. It is shown that in the course of inspection multichannel belt-conveyor weighers may be represented by a combination of two-channel weighers without halting the technological process.

A diamond-based single-element ultraviolet photodetector that may be used in spectrophotometric equipment is developed. The characteristics of the spectral sensitivity of the detector as a function of the applied voltage are presented. The capabilities gained from the use of similar devices for systems used in the analysis of the composition of multicomponent mixtures are considered.

There are multiple ways to increase the accuracy of temperature measurement by reducing uncertainties of temperature scale realization by means of standard platinum resistance thermometers (SPRT) calibrated at the defining fixed points (DFPs). This paper demonstrates the possibility of reducing uncertainty of temperature scale realization by taking into account correlations between the SPRT resistances at the DFPs in calibration and temperature measurements. The BIPM document Uncertainties in the Realisation of the SPRT Subranges of the ITS-90 issued in 2009 provides an overview of the different approaches. In most cases, SPRT resistances at DFPs were considered as uncorrelated. Only correlations caused by using the same SPRT resistance at the triple point of water (TPW) in calibration and temperature measurement were taken into account. Furthermore SPRT resistances at the DFPs can be correlated with respect to some of the same conditions in the laboratory for SPRT resistances measured at the DFPs. This paper demonstrates that the uncertainty of temperature scale ITS-90 realization is unaffected by errors originating form SPRT calibration and temperature measurements when all the measured resistances are measured with the same error. Furthermore, it is shown that the use of correlation can reduce the uncertainty of temperature scale realization, and dealing with this problem will bring improvement in the field of uncertainty evaluation. Formulas for the calculation of uncertainties of temperature scale realization are presented, together with the correlation between SPRT resistances and simulations that show the impact of correlation on the uncertainty of the temperature scale realization.

We present the fundamentals of the physical processes of forming the video signal in a scanning electron microscope. We have produced a new library algorithm for video modeling. Testing of the algorithm has shown its reasonable accuracy, detailed correspondence with video signal simulations of their experimental counterparts. Computation for a model signal of 500 points takes less than 1 second, which is many thousands of times faster than using the Monte Carlo method.

A method and results are described for international interlaboratory comparisons of hydroacoustic measurement reference standards. The comparison was organized by the National Institute of Ocean Technology, India, with the participation of reference standards from Germany and Russia. Data are presented on the reference standard installations of the comparison participants and the measurement methods used, and the impact of water temperature on comparison results during calibration is discussed.