Vol 61, No 7 (2018)

We construct models of the limit distributions of the Anderson–Darling k-sample homogeneity test. We propose new k-sample homogeneity tests based on the use of Smirnov, Lehmann–Rosenblatt, and Anderson–Darling two-sample tests. We present models of the limit distributions for the proposed tests. We also perform the comparative analysis of the power of the set of k-sample tests, including the Zhang tests.

An algorithm for processing the results of paired comparisons in order to estimate the quality of alternatives is proposed. It is shown that through the use of the new algorithm it is possible to abandon the traditional method, which employs one of the eigenvectors of the matrix of paired comparisons for these purposes. By means of the new algorithm, additional constraints in ranking alternatives by the method of paired comparisons may be eliminated.

A mathematical model of the interaction of pulsed laser irradiation with the surface of ST-50-1 glass ceramic is proposed. The energy distribution in a laser beam is examined, and the temperature field of the plate surface in the region of effect of the laser beam is calculated. The correspondence of calculated and experimentally-derived dimensions of the melt region is established.

We investigate the possibility of increasing the accuracy of indirect measurements of the difference in the flow rates in a thermal carrier as a result of the choice of flowmeters whose errors are in a certain ratio. Recommendations for choosing the optimal ratio of flowmeter errors are given.

The basic structural blocks and functional capabilities of smart sensors are considered. An implementation of the functions of metrological diagnostic self-checking of sensors equipped with a bridge measuring circuit is proposed. An adaptive strain-gauge pressure sensor based on nano- and micro-electromechanical systems is investigated.

The volume of a tank from the formulations in the State Primary Special Standard of the unit of the volume and mass flow rate of water GET 119–2010 is measured by means of 3D laser scanning. A comparative analysis of reference data and measurement results is presented. The error caused by software processing of the results of scanning is estimated.

The technical design of a source of collimated laser radiation is considered. The source is constructed according to a calorimetric principle and implements a self-similar thermal regime of operation in direct and reverse electric power supply of the laser diode. A measurement process algorithm by means of which the radiating power at the output of the source may be determined from an estimate of the difference in the power of the electric current in direct and reverse actuation of the diode is proposed.

The results are presented for the study of an installation for transmission of a highly stable frequency signal with relative instability no greater than 4·10^–17 on a fiber-optic communications line over a distance of 150 km. The installation uses external modulation of laser radiation and active electronic compensation of phase noise. The installation makes it possible to provide synchronization or time scale comparison of mutually separated time and frequency standards that are a component of the highest-category time and frequency standards.

We propose a mathematical model of a multifunctional vibration-frequency measuring transducer of force with a cylindrical resonator. The resonator consists of an electromagnetic exciter and an induction receiver of oscillations. We present relations for the optimal form of longitudinal and transverse oscillations of the resonator, at which maximum sensitivity to the controlled parameter is reached and the energy spent on excitation of oscillations of the resonator is minimized. The signal-to-noise ratio, which takes into account the design parameters of the receiver and the oscillating agent, is obtained. The universal characteristic of the vibration-frequency measuring transducer of oscillation frequency with a cylindrical resonator is found.

We consider the problems of measuring the temperature of objects heated in high-power microwave installations and show the advantages of using pyrometers for these purposes as compared with thermocouple temperature meters. The procedure of finding the characteristics of below-cutoff waveguides with circular cross sections intended for application in combination with pyrometric sensors is described. We also present the plots for the rapid evaluation of the geometric parameters of circular below-cutoff waveguides depending on the required inserted attenuation. An example of application of a circular below-cutoff waveguide in combination with a KM-1 pyrometer is presented.

An algorithm based on a parametric model of the reflected signal for data processing in radar measurement systems with linear transmitter frequency sweep is proposed. Results of simulations using this algorithm for determining the distance of two dynamically varying targets against a noise background are shown.

We propose a method for reducing the distortion in the sensitivity calibration curve of a hydroacoustic recorder. This method is based on correction of the transmission curve for a spatial filter implemented using the complex moving weighted average (CMWA) method. This method was tested using control measurements performed using the tone-burst method, with favorable results.

The problem of suppressing the low-frequency component of the electrocardiogram signal during computerized electrocardiographic measurements is examined. The efficiency and possible realization of the main methods for eliminating low-frequency noise are compared and their applicability to different electrocardiographic measurements is examined. The results are confirmed by experimental studies of simulated and real electrocardiogram samples.