Automated system of measuring data analysis of ultrasound anisotropy icon

Automated system of measuring data analysis of ultrasound anisotropy




НазваAutomated system of measuring data analysis of ultrasound anisotropy
Дата30.06.2013
Розмір9.57 Kb.
ТипДокументи


UDC 548:539.3, 534.222.2


AUTOMATED SYSTEM of MEASURING DATA ANALYSIS of ULTRASOUND ANISOTROPY


Onanko A.P., Kulish M.P., Lyashenko О.V., Prodayvoda G.Т., Vyzhva S.А., Onanko Y.А., Slisarenko D.A.

Taras Shevchenko Kyiv national university, Kyiv

onanko@univ.kiev.ua


The acoustic diagnostics of relaxed processes is carried out by nonlinear multicomponent crack model with inwardly pore pressure taking into account a strain condition and temperature. Influence of nonlinear processes on the real environment results in to the dissipated destruction which in same queue causes degradation of deformation characteristics – decrease of effective elastic characteristics Cij. The characteristic of mechanical behavior of environment is a capability of accumulation of mechanical defects even at small quasistatical loadings σ and not only at the effect of shift strains σ but also at tensions and pressings. The generation of fractures is unavoidable accompanied the absorption of energy ΔW as a result of growth of cracks and appropriate change of structure of environment in locality of cracks banks [1].

For measuring of elastic module E and internal friction (IF) the impulse method on frequency f ≈ 1.67; 5 MHz and the method of complete piezoelectric oscillator on frequency f ≈ 118 kHz were used at deformation e ≈ 10-6 in vacuum P ≈ 10-3 Pa. A measuring error relative change of the elastic module was ≈ 0.5 % [2,3]. Annealing of structure defects bends out of shape the type of IF temperature spectrum. At annealing admixtures, vacancies go out. The depth of dislocation density ND and the broken layer hb are determined from IF difference ΔQ-1 on the nearby harmonics f1 and f2 after mechanical treatments. The dislocation density are measured in limits ND = 106÷109 m-2. The depth of the broken layer hb ≈ 3000 nm was. The measuring of background internal friction Q-10 after mechanical treatments gives information about the photothermal strains fields σi in SiO2 + Si wafer-plates.

The illustration of the window of completed 2, 3 stage working of velocities anisotropy US measuring data is presented on fig. 1 and fig. 2.



Fig. 1 − Illustration of the up party of the window of completed 2 stage working of velocities V anisotropy US measuring data.



Fig. 2 − Illustration of the down party of the window of completed 3 stage working of velocities V anisotropy US measuring data.


Conclusion

Thus, the developed automated system of numerical analysis and visualization of the ultrasound measuring data of anisotropy parameters of the elastic waves velocities can be use for express-treatment of experimental values of phase velocities of longitudinal V, "rapid” V┴1 and “slow” V┴2 of transversal waves and density ρ.



REFERENCES

1. Nikanorov, S.P. Elasticity and dislocation inelasticity of crystals [Text] / S.P. Nikanorov, B.К. Кardashev. – М.: Nauka, 1985. - 253 p.

2. Onanko, A.P. Acoustic attenuation in silicon and silicon oxide [Text] / A.P. Onanko, O.V. Lyashenko, Y.A. Onanko // J. Acoust. Soc. Am. – 2008. - V. 123. - № 5, Pt. 2. - p. 3701.

    3. Lyashenko, O.V. Structural defects relaxation during complex thermal and dynamical mechanic processing of CdTe [Text] / O.V. Lyashenko, A.P. Onanko, V.P. Veleschuk et al. // Photoelectronics. – 2008. - № 17. – p. 10-13.


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