Сomplex approach to certification and metrological estimation the state of digital seismometric registrators

The modern stage of the latest metrological achievements is being intensively deve-loped in our country in new methodological directions that are based on new scientific and technical achievements. The using of metrologically certified devices of different types and with different metrological parameters increases the level of confidence in the results of these works, because the relative comparison of the results of these works allows potential customers to choose the most useful and effective method for obtaining the desired results. This article presents the results of joint scientific and technical works for the methodology of certification of the calibration developed and patented device and the results of using an already certified calibration device for metrological determination of accelerometer parameters, measurers displacements and velocities. This article also shows that one of the important areas of such work on the metrology of measuring devices in the area of seismology is also to determine the amplitude-frequency characteristics or amplitude-frequency and phase characteristics of different devices for measurement velocity, acceleration or displacement for the using of these devices in modern automated complex systems for determination of various parameters of seismic events such as regi-onal, local and teleseismic. The article also presents comparative analyzes of experimental results of work on determining the frequency characteristics of the calibration device in different areas of measurements — displacement, velocity and acceleration. Obtaining these important results for assessing the state of various other seismological devices allowed experimentally do it for possible determination the presence of different types of physical differences in the regions of the same frequency range for displacement's and velocity's measurers. Compliance of the certificate with the requirements of the international metrological certification system ISO/IEC17025, obtained for the calibration device had been ensured by SE «Ukrmetrteststandart».

Radiometer for measuring gamma-radiation, beta-particles and neutrons based on DRG-05M dosimeter

As a result of the modernization of the DRG-05M dosimeter, a convenient device was obtained, which allows estimating the level of gamma- and X-ray radiation, beta-particles, and neutrons without changing the detector heads. Two devices were manufactured and a third one was prepared for metrological certification.

Simulation Model of an Adaptive Control System for a Segmented Deformable Mirror in a Space Telescope and its Metrological Certification

The paper concerns a measurement problem of identifying inadequacy in a mathematical model of an adaptive control system driving segments of a deformable mirror in a large telescope. This is necessary to assess the validity of this model. A dual-axis servo drive unit utilising permanent magnet synchronous machines controls the mirror segments. The servo unit rotates each segment of the deformable mirror with respect to its axis of symmetry and tilts each segment relative to the fixed central reference segment. The paper provides general descriptions of the model structure and the feedback in the current control loop employing phase current measurement and coordinate transformations. We present initial data sets for metrological certification of the model. We used the MMK-stat M software to perform the metrological certification so that we could check empirical equations, determine the scope of application for the model and validate it. The metrological certification allowed us to confirm that the model of an adaptive control system for a segmented deformable telescope mirror is valid, and to find the model structure that ensures a more accurate description of the measurement problem that concerns controlling the spatial position of the object simulated

Computer system for metrological testing of location sensors used to monitor the patient's condition in magnetotherapy

Non-contact monitoring of vital signs of a person is a reliable and safe way of promptly obtaining objective diagnostic information about the current physiological state of a patient during surgical operations, physiotherapeutic procedures or during sleep. The absence of direct contact of the sensors with the patient's body makes it possible to exclude the influence of a number of interfering factors, such as a violation or weakening of contact, which can lead to a deterioration in the quality of signals from the output of the sensors, a long-term location of the sensors on the body can have a psychological effect on the patient, changing his condition and thereby distorting the treatment method, etc. In order for the results of monitoring and diagnostics to be reliable and guaranteed accurate, it is necessary to carry out periodic metrological certification of location sensors, especially since many of them are of foreign production and their characteristics are either not standardized or do not meet the requirements of their operating conditions. Therefore, the tasks of developing methods and means for carrying out metrological tests of non-contact sensors for medical purposes are becoming urgent. Purpose – to show the possibility of implementing automated metrological tests of location sensors for medical use based on a personal computer and publicly available standard hardware and software. A method has been developed and implemented for conducting metrological tests of location sensors based on a personal computer, a digital dynamic measure of linear displacement, virtual measuring instruments, laser and ultrasonic sensors, as well as determining conversion errors in the LabVIEW environment. As an exemplary measuring instrument, it is proposed to use a webcam with a virtual device for recording the law of displacement in the LabVIEW Vison Development application. Full-scale experiments have been carried out, in which, using a digital measure of linear displacement, it is possible to reproduce with high accuracy almost any law of displacement and to regulate its informative parameters. Real movement signals were received with the help of virtual devices, recorded by two location sensors and a web camera. The errors of the means of registration are determined in comparison with the given digital method and analytically the law of movement. Introduction of the developed method and hardware and software for metrological certification of sensors of diagnostic channels of the systems of complex magnetotherapy «Multimag» and «Relaxmag». Carrying out automated metrological tests of sensors will ensure prompt, reliable and objective control of their actual characteristics, which means it will increase the effectiveness of treatment due to the prompt and continuous monitoring of the patient's functional state and an objective assessment of a number of important indicators.

CONSTRUCTION OF THE CONCEPT OF MEASUREMENT TECHNOLOGIES AS THE BASIS FOR THE EVOLUTIONARY DEVELOPMENT OF THE COMPUTING PROCESS

The development of the general theory of measurement stimulated the expansion of metrological requirements and the nomenclature of data quality indicators, as well as the emergence of new types of measurements, metrological certification and control, in particular, metrological algorithms, models, objects and measurement conditions. As a rule, the practice of modern measurement problems is accompanied by complex experimental conditions associated with the presence of significant a priori uncertainty about the properties of objects and factors affecting the environment of their functioning, the relationship between them, inaccuracies and incompleteness of experimental information, the unavailability of direct observation of many properties of objects or influencing factors, which distinguishes the cognitive function of the methodology for solving them from the fundamental one. Therefore, the formulation of these problems as measurements increases the role of the cognitive function of measurements and requires the results of their solutions in the form of knowledge (analytical expressions for models, as well as conclusions and solutions) based on the entire volume of a priori information and information obtained during the measurement experiment, including nonnumerical information.

Automated control system for fire cutting units on a plate mill

One of the most important indicators of a plate rolling mill efficiency is a metal consumption (cost coef-ficients) per ton of product. Reduction of metal consumption coefficients is ensured by the accuracy of the set geometric dimensions realization during the rolling, increasing the accuracy of geometric dimen-sions of the plates that are cut from the rolls on fire cutting units, as well as by operating in the minus field of tolerances on the geometric dimensions of the plates. Improving the accuracy of the geometric dimensions of the plates, cut from the rolls on the fire cutting units, is achieved through the automatic control of these units. The article describes the technical solutions, implemented in the automated con-trol system of fire cutting units (the ACS FCU) of the heat treatment department and fire cutting of a plate mill 3600. The purposes of the ACS FCU creation include an increase in accuracy and stabilization of the geometrical sizes of the work pieces cut out of plates through the automatic control; reduction of metal consumption coefficients due to the operation in the minus field of tolerances on the geometric dimensions of the work pieces; replacement of obsolete equipment with the modern one in order to in-crease the reliability of the mill equipment operation; increasing the ACS FCU service life through the use of modern equipment with high reliability characteristics; reduction of unplanned equipment down-time that may arise as a result of the ACS FCU technical means failures. The automated control system of fire cutting units has been set up, tested and put into operation; a metrological certification of the system has been carried out as well. The results of the ACS FCU testing and its subsequent operation have confirmed the system efficiency and the performance of all its intended functions. This system can be also implemented in the processes of treatment of other rolling mills, equipped with the units for the fire cutting of metal.

IMPROVING THE METHODOLOGY FOR METROLOGICAL CERTIFICATION OF TOTAL STATIONS AND LIGHT RANGE FINDERS

To ensure the uniformity of measurements, it is necessary to perform periodic verifications of ge-odetic instruments in accordance with the requirements of the relevant regulatory documents. In relation to total stations and light meters, ensuring the uniformity of measurements should be carried out by conducting annual periodic checks with the use of stationary reference bases of the 2nd or 3rd category, which were previously created in almost all regions of the country. However, to date, only two such bases have been preserved on the territory of the Russian Federation. The reason for this situa-tion was the lack of proper metrological support for the line lengths of the reference bases themselves, caused by the need for organizational measures, the lack of trained specialists, as well as significant financial expenses for field work. In this regard, there was a scientific and technical task of developing a local calibration scheme (LCS) to provide periodic verifications of total stations and light-emitting diodes over the entire range of measured distances, which does not require the creation of stationary reference bases. For this purpose, the LCS scheme is proposed, based on the use of the method of direct distance measurements. Its essence lies in the simultaneous measurement of the selected distances by reference and verified total stations. To do this, a reference total station and a verifiable one are installed on two tripods located next to each other, which measure the same distance. After that, the total stations are swapped and the measurements are repeated. At the end of the measurement, the measured distances are compared with the reference and verified total stations. Then, based on the difference between these distances, a conclusion is made about the accuracy of the de-vice being tested, as stated in the technical data sheet. The results of the implementation of the proposed LCS showed that its scheme provides the accuracy of measurements at the level of the 2nd category reference basis, and the methodology and accuracy of the length unit transmission meets the of regulatory requirements.

METROLOGICAL CERTIFICATION AND TEST CONDITIONS FOR VERIFICATION EQUIPMENT

The article analyzes the metrological certification and test conditions for verification equipment. The main tasks of metrological certification, test conditions, accuracy characteristics of verification equipment, primary, repeated and periodic, expert and inspection certification of verification equipment are considered in the article. Besides, the major tasks of the testing equipment certification are considered as well. They are: establishing the current testing equipment eligibility in accordance with its purpose, establishing the actual reproducibility values of test conditions implemented by testing equipment and assessing the technical characteristics compliance of testing equipment with the safety, hygienic and other special requirements

Development of a refractodensimetric method for determining the content of ethyl alcohol and total wine extract by a computer

The work is devoted to the improvement of the methodological foundations of the refractodensimetric method of analysis as applied to liquid alcohol-containing products of grape winemaking. The regularities of changes in density and specific refraction of ethyl alcohol and substances of the extract of grapes and wine depending on their concentration based on the processing of the data of measuring the refractive index and density of various alcohol-containing products of winemaking and model solutions based on them, as well as based on the analysis of data from official densimetric and refractometric tables to determine the concentration of aqueous solutions of ethyl alcohol and total extract of the must, has been determined. The improved mathematical model of an alcoholic drink is proposed, which adequately describes the dependence of the refractive index and density of the drink on the content of ethyl alcohol and extract, based on the use of the additivity property of the specific refraction and the mass of the components of its constituents. On the basis of the proposed mathematical model of the drink, an algorithm has been developed for determining the volume fraction of ethyl alcohol and the mass concentration of the total extract for winemaking products, based on measuring the density and refractive index as the basis for the method for determining the volume fraction of ethyl alcohol and the mass concentration of the total extract. Preliminary metrological certification of the method for determining the mass concentration of the total extract and the volume fraction of ethyl alcohol in alcohol-containing products of grape winemaking has been carried out. The results of the work can be the basis for the development of a non-destructive express method for determining the volume fraction of ethyl alcohol and the mass concentration of the total extract based on the standard equipment of the laboratory of wineries, as well as the development of technical specifications for the manufacture of a portable device for determining the concentration of alcohol and extract based on the simultaneous measurement of the refractive index and density of liquid media.

Refractodensimetric method for determining the volume fraction of ethyl alcohol in wines and winy beverages

The tabular functional dependence of the ethyl alcohol content in liquid products of winemaking on the density and readings of refractometer sugar scale based on the processing of the measurement data of the refractive index and density of the model solutions and samples of wine products, as well as the paralleling determination of the volume fraction of ethyl alcohol by the method certified in winemaking according to GOST 32095-2013 was obtained. The established dependence was the basis for development of a non-destructive express method of determining the volume fraction of ethyl alcohol for wines and wine beverages prepared using products of winemaking, based on the changes in the density and index of refraction of liquid media. The use of bilinear interpolation methods made it possible to create a clear algorithm of actions for processing the measurement data, ensuring the sufficient relevance and unambiguity in determining the volume fraction of ethyl alcohol based on refractometry and densimetry data. Metrological certification of the method has been carried out. The method can be the basis for development of a regulatory document prescribing its use in the wine industry, as well as a technical task for realization of a portable device for determining the volume fraction of ethyl alcohol in liquid products of winemaking, based on the joint measurement of the indexes of refraction and density of the liquid.