In this article is presented the description of the detection unit of the whole body counter AT1316A. Is shown brief description of the mathematical processing methods. Is presented the main advantages of the offered functions.

Application of light-induced thermal transient gratings for measurement of thermal diffusivity of solid state materials including thin films is presented. Laser-optical set-up, which allows non-contact measurement of thermal diffusivity by transient gratings′ method is described. The set-up was designed in B.I. Stepanov Institute of Physics of NAS of Belarus.

A gauge for measurements of thermal coefficient of the optical path, W, is developed. The measurements are based on the laser beam deviation method for medium with linear thermal gradient. The gauging is performed for spectral range of 0,4–1,1 μm in linearly polarized light with precision of 0,3×10-6 K-1. On the basis of measured W value, thermo-optic coefficient, dn/dT, can be determined.

The optimal configuration of the double Helmholtz coils for measuring of the magnetic dipole moments was defined. It was determined that measuring coils should have round shape and compensative coils – the square one. Analytically confirmed the feasibility of the proposed configuration of these coils as primary transmitters of magnetic dipole moments.

Development and experimental studies of the generator of wideband signals were conducted by the method of direct digital synthesis. Generator allows for the correction of phasefrequency characteristics of the formed broadband signal. The level of spurious radiation was investigated at the output of the frequency mixer in the transfer of the signal spectrum in the band of UHF.

The study is based on results of modeling of measurement circuit containing vibrating-plate capacitor using a complex-harmonic analysis technique. Low value of normalized frequency of small-sized scanning Kelvin probe leads to high distortion factor of probe’s measurement signal that in turn leads to high measurement errors. The way to lower measurement errors is to register measurement signal on its second harmonic and to control the probe-to-sample gap by monitoring the ratio between the second and the first harmonics’ amplitudes.

Schematic and design of electronics module for avalanche photodiode signal′s readout based on the pair of specialized analog ICs, are considered. Main specifications including input noise charge vs signal source capacity are presented.

Design and fabrication technique of four sensor gas microsystem based on nanoporous anodic alumina have been developed. Simulation of basic elements′ temperature and thermo-mechanical deformation created in the microsystem construction has been carried out by finite element method. r-spacing:-.05pt'>боты микросистемы.

Interdigital capacitive sensor for excessive skin moisture content was developed.

An algorithm for image forming of photographing object having large range of brightness  from a series of  images obtained by exposure bracketing of LDR-images that minimizes loss of information had been proposed.

The technique of simultaneous determination of the spontaneous emission probabilities Аmn and the collision self-broadening coefficients γ_mn of the СО₂ spectral lines is presented. The dependence of the absorption coefficient on the gas pressure, obtained for the СО₂10R22 line at temperature 300 K was measured. Using the data, the spontaneous emission probability А_mn and the collision self-broadening coefficient γ_mn were calculated.

The matter of the study is application of contact potential difference and band bending visualization technique based on Kelvin–Ziesman technique to the non-destructive testing and defects study of a silicon-insulator structure. Experiments were held using a thermally oxidized boron-doped silicon wafer. Visualized defect distribution map is in a good agreement with a preliminary data on defectproducing factors. Results compared to ellipsometry data show that CPD visualization data is not influenced by presence and thickness of insulating layer.

The matter of the study is application of contact potential difference and band bending visualization technique based on Kelvin–Ziesman technique to the non-destructive testing and defects study of a silicon-insulator structure. Experiments were held using a thermally oxidized boron-doped silicon wafer. Visualized defect distribution map is in a good agreement with a preliminary data on defectproducing factors. Results compared to ellipsometry data show that CPD visualization data is not influenced by presence and thickness of insulating layer.

Results of measurements of Raman scattering at the room temperature in air in boron doped synthetic diamonds (five with boron concentrations 2·1017; 6·1017; 2·1018; 1,7·1019; 1·1020 cm–3 and one intentionally undoped) are presented. The laser with wavelength 532 nm was used for Raman scattering excitation. Dependences of integral intensity and halfwidth of diamond Raman line with respect to the doping level are presented. In the geometrical optics approximation an expression for doped to undoped integral intensity ratio is obtained. Qualitative estimates of conductivity of the studied samples are conducted. The obtained results can be applied for mapping of near-surface laser radiation absorption coefficient of synthetic single crystal diamonds and for their quality control.

A mathematical model of asynchronous optical communication channel with a photon counter applied as a receiving module has been built. The expression for calculating of data throughput of this channel has been obtained. As a result of implemented experimental investigations it has been established that the data throughput of asynchronous optical communication channel containing a photon counter on the basis of avalanche photodetector as a receiving module depends on optical radiation and photodetector supply voltage.

The piezomaterial used in cylindrical piezoceramic transducers vibrations requiring high precision displacements indicates that accuracy depends on design and technological factors. The analyzed criteria have made possible to choose the piezomaterial for optimal mechatronic system having a maximal displacement. The experimental investigation of precision vibrosystems by means of 3D holographic visualization enables one to obtain appreciably larger amount of information about the vibrating surface in comparison with traditional methods. On the basis of the developed methodology of analyzing the experimental data derived from 3D holographic visualization and by using the experimental holography stand, we have obtained results making it possible to optimize the design of operation of the piezoceramic mechatronic system or its separate elements.

A method for improving the accuracy rangefinder with a semiconductor laser operating in the mode of accumulation of weak reflected signals at multiple sensing target, is described. It is shown that the use of in receiving channel of rangefinder two threshold electric drive with automatic adjustment of levels, can improve the signal/noise ratio and improve the accuracy of measurements. The results of laboratory and field tests distance measuring channel observation device are given.

A method of diagnostics of power structures based on shock excitation of eiqenmodes and used as a diagnostic parameter of modal characteristics (natural frequencies and mode shapes) is proposed. Using an airplane wing of MiG-29 a method of diagnosting the defectiveness of the attachment based on the analysis of feedback signals of shock effects. A numerical and full-scale experiments to evaluate the effectiveness of the proposed options are presented.

The way of expressing the dynamic uncertainty of measurement that allows using the spectral function of the input signal and the frequency response of the measurement tools used to assess the uncertainty in its dynamic operation.

The  method  of  expansion  of  set  of  analyzing  frequencies  with  digital  filters,  based  on  frequency selection, was suggested. The way of increasing of measurement precision using this class of filters was investigated.  The  conformal  generalization  of  structure  of  filters  based  on  frequency  selection  and  the standard nonrecursive comb filter are the base of this method. This method can be used in different fields of research where the task of determination of hide periodicities is actual.