No 8 (2013)
GENERAL PROBLEMS OF METROLOGY AND MEASUREMENT TECHNIQUES
3-6 71
Abstract
The peculiaritiesof harmonic signals vector measurements based on the so called method splitting sets of sampling readings ofperiodic signalsin case of subharmonicnoise action are considered. A method of this noisesuppressionis proposed and the possibilities of its realization in instruments for measuring theactive and passive electricalvalues are discussed.
7-9 56
Abstract
The task of optimizing the two-component measuring instrument consisting of sensor and normalizing amplifier either of which may have thenormalincreased enhanced accuracy is considered. The optimization is performed by integer-valued mathematical programming method in the Delphi language with use of two mutually-contradictory target functions. The proposed method is applicable for optimization practically of any two-component systems, couplings and junctions.
9-11 63
Abstract
The analysis of the metrological and mathematical correctness of the control of dynamic stability and the building structures oscillations forms identification are presented. The normative documents regulating the dynamic survey and the results of their practical application are considered. The analysis confirming the low reliability of data on buildings and structures oscillations forms is presented.
12-15 62
Abstract
The multifactorial mathematical models of turbounits are constructed and the modeling of response of change of their parameters on the influence of pulses of external electric network is carried out. On the base of computing experiment the control of change of electromechanical characteristics of turbounits in process of voltage increase on the coils of generator stator under the influence of external electric network pulse is realized.
16-18 60
Abstract
A method of measuring the power of sub-THz and THz radiationsby means of resonance tunnel diodes (RTD) basedon theregistration of RTD current-voltage characteristics change is suggested. The possibility ofextension of microwavemethods of registration ofmicrowave signalin direction ofsub-THz andTHzwaves is demonstrated.It is shownthat thedetector based onsuchRTDprovides themicrowaveradiation detection in the widerange ofUNFfieldsintensities.
ТЕРМИНОЛОГИЯ
19-23 60
Abstract
The probability and suitability of application in the Russian texts on metrology of the term «референсный»as the equivalent to English term “reference” is discussed.
LINEAR AND ANGULAR MEASUREMENTS
22-23 70
Abstract
The analysis of metrological capabilities of the present-day shtangenreysmases and height gages is carried out. The full description of modern height gages design is presented.
OPTICOPHYSICAL MEASUREMENTS
23-27 54
Abstract
Based on two-dimensional Pearson distribution the formulas for determination of the width and diameter of laser beam of existing standard ISO 11146–2008, taking into account the limited dynamic range of measuring device – are received.
28-30 92
Abstract
The analysis of modern methods of optical wavefront control is given achromatic 3D-interferometer for express analysis of wavefront quality in wide spectral range is considered. The description of experiment and the examples of interference patterns of plane and distorted wavefronts of laser beams propagated through laminar or turbulent air flows are presented.
31-34 74
Abstract
The influence of shot noises on the accuracy of measurement of resonant frequency of Fabry–Perot interferometerinPaund–Drever scheme is considered. As a model of periodically non-stationary shot noise the Poisson random process with independent moments of particular pulses (electrons) origin is used.
ИЗМЕРЕНИЕ ВРЕМЕНИ И ЧАСТОТЫ
34-38 91
Abstract
The automatic frequency control of auxiliary crystal oscillator algorithm based on two time-scales frequency measurements is proposed for formation of output signal of atomic clock ensemble. The algorithm can be realized in atomic clock combining systems based on the synchronization of auxiliary oscillator by several atomic clocks of the ensemble.
MECHANICAL MEASUREMENTS
39-41 68
Abstract
The influence of the speed of sound on the expansion coefficient of narrowing devices is considered. It is shown that the standard nozzles extension equation can be expressed through the speed of sound. The analysis justifyingthe criterion of applicability limits for the equation of gas expansion beyond the nozzles at gas and flow quantity measurement is presented.
41-44 49
Abstract
The measuring problem of structural-parametrical identification for mathematical model of air volume penetrationfor window and door assemblies is considered. The estimation parameters are suggested.
RADIO MEASUREMENTS
Метрологическое обеспечение измерений коэффициента гармоник низкочастотных радиотехнических сигналов
45-49 80
Abstract
The current state of metrological assurance ofTHD meters based ondigital measurements methods and the synthesis of signals is considered. The keymetrological characteristics of the calibrator-meter CK6-20, generator-calibrator CK6-122,and meter-calibrator CK6-20A are presented.
49-52 100
Abstract
The operation of panoramic measuring receiver in the frequency range 1500–2400 MHz with automatic trim control of input bandwidth filter along the slope of its resonance characteristics is described.
ACOUSTIC MEASUREMENTS
53-58 55
Abstract
The approximational filtration method of noise reflections is proposed for solution of a task of measurement of coordinates of moving in aquatic environment object with sound emitter. The measurements are carried out by means of passive location hydroacoustic system based on network of hydrophones. For digital processing of Doppler hydro-acoustic signals from hydrophonesoutputs the two-stage approximation algorithm is used. The example of filtration method realization and its errors are considered.
MEDICAL AND BIOLOGICAL MEASUREMENTS
59-63 81
Abstract
The methods of measurements, systems analysis and electrocardiographуinformation processing are suggested. The classification of organismfunctionalstate by introductionof a normin heartrhythmcontrolregime is presented. Within a framework of the model of systems of control and regulation of healting organism physical state by means of regime variability of heart rhythm the adaptation mechanisms are presented in the form of convertibility function of these systems.
PHYSICOCHEMICAL MEASUREMENTS
63-67 65
Abstract
The functional scheme of system for reproduction of the liquid electrolytic conductivity unit is presented. The mathematic model of transformation error for the primary standard four-electrode conductometric cell specitied by the electrode system geometry is developed. The conditions at which this error does not exceed 1∙10–5 are determined.
МЕЖДУНАРОДНОЕ СОТРУДНИЧЕСТВО
68-72 61
Abstract
The results of international supplementary comparisons of national standards of the unit of average laser power between Russia and Germany, carried out from 2009 to 2012 are presented.
ISSN 0368-1025 (Print)
ISSN 2949-5237 (Online)
ISSN 2949-5237 (Online)
