error

OPTOELECTRONIC QUARTZ SENSOR OF FORCE AND PRESSURE

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.

DEVELOPMENT OF SYSTEM OF PROVIDING METROLOGICAL RELIABILITY OF MEASURING INSTRUMENTS

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.

ANALYSIS OF VERIFICATION AND CALIBRATION METHODOLOGIES OF MEASURING INSTRUMENTS

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.

THE MODIFIED STRUCTURE OF THE TWO-LEVEL DIGITAL FREQUENCY SYNTHESIZER FOR DOSIMETRY

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.

Cylindrical control of holes of tube details manufactured by deforming broaching

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. They are caused by the variation of axial deformations of the sections of blanks of various thickness in the circumferential direction.

Techniques for Natural Gas Physical Properties Definition for Flow Rate and Volume Metering Systems

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.

Error type conversion path - path» in the automated systems of processing of biomedical imaging

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 computation of transformation parameters between national geodetic reference coordinate system UCS2000 and international systems ITRS/ITRF2000 and ETRS89/ETRF2000

The problems of transformation of coordinates in the state geodetic network in Ukraine
using common terrestrial coordinate reference systems and coordinate systems USK2000.