Sensors with a frequency output signal are marked as particularly high accuracy, it is easy to switch, and signals may be transmitted over long distances. The main element of such sensors is an electromechanical oscillator connected to the feedback of the autogenerator. String metal oscillators do not provide the required measurement accuracy due to unsatisfactory elasticity, hysteresis, relaxation, and drift of characterisrics. The creation of oscillators made of quartz and silicon due to the perfection of these materials, is difficult.
The current state of development of the metrological provision of measuring equipment for the competitiveness of products, safety at work (radiation safety), obtaining objective diagnostic information in medical practice is analyzed. Metrological support is one of the main steps in the production process that influences the measurement results and their qualitative evaluation.
The article focuses on the main problems of metrological confirmation of measuring instruments in accordance with international requirements and considers possible directions of their solution. One of the main tasks of metrology is assurance of the uniformity of measurements, that is, the state of measurements, in which their results are expressed in the legal units, and the characteristics of errors or uncertainty of measurements are known with a certain probability and do not exceed the established limits.
Digital frequency synthesizers are widely used in various fields of technology. Their main advantages, compared to analog devices, are the accuracy of output signal, resistance to external factors, reliability and high performance. Their structures include the digital storage device (accumulative adder) and a comparison scheme. Basing the latest the two-level digital frequency synthesizers are developed. They are the subset of digital frequency synthesizers, in which the output signals are two-levelled.
This work is devoted to the issues of processing holes in different thickness of tubular billets great length deforming broaching. The urgency of this problem is substantiated. The results of studying the regularities of deformation of a material in the deformation zone under deforming broaching are presented. The reasons for the formation of this type of geometric error as the curvature of the axis of the machined hole are established.
The results of researching the techniques for natural gas properties determination for flow rate and volume metering systems are presented in the paper. The necessity of developing techniques for calculating the isentropic exponent of natural gas for pressure up to 25 MPa based on a simplified set of parameters of gas composition is shown.
The analysis of the histological and cytological images characteristics and automated biomedical images processing systems is provided. The structure of "contour-contour" transformation error and it evaluation is explored. A computer experiments of contours transformation error evaluation is done based on cytological images example.
The problems of transformation of coordinates in the state geodetic network in Ukraine
using common terrestrial coordinate reference systems and coordinate systems USK2000.