The problems caused by the cavitation bubble and caused many adverse effects on the ship propeller, hydraulic machinery and equipment. In order to research the production mechanism of cavitation bubble under different conditions, cavitation bubble zone parameter fine measurement and analysis technology is indispensable, this paper adopts a non-contact measurement method of optical autonomous construction of binocular stereo vision measurement system according to the characteristics of cavitation bubble, the texture features are not clear, transparent and difficult to obtain, 3D imaging measurement of cavitation bubble using composite dynamic lighting, and 3D reconstruction of cavitation bubble region and obtained the characteristics of more accurate parameters, test results show that the cavitation bubble characteristics of the fine technology can obtain and analyze cavitation bubble region and instability.
The theoretical model of single bubble movement in an ideal solution, to carry on the numerical simulation of the process of cavitation in the liquid, the liquid in different laser energy, laser induced cavitation rules and acoustic characteristics were studied by high-speed camera, high frequency measurements of the hydrophone. The results show that with the increase of laser energy, the period of bubble pulsation and the maximum bubble radius increase gradually, and the amplitude of the laser acoustic signal becomes larger.
The equation of laser detection system range and multi-wavelength conversion technique were used to calculate the maximum detection range under different meteorological conditions. A new algorithm was proposed to solve the detection range implicit function equation, by which the accurate arithmetic solution could be got quickly. When solving the detection range implicit function equation, the atmospheric transmittance is the function of range, the multiwavelength atmospheric extinction coefficients were calculated with neural network conversion model. Then the equation was solved by linear interpolation and iteration methods, the iteration initial value was estimated with numeric method. This algorithm is valuable for simulating, model building and designing of multi-wavelength laser system under different seasons and atmospheric circumstance.
This paper designed a bubble recognition system which was based on back light-scattering of bubbles in wake of ships, studied imaging characteristics of remote bubbles, and used technologies of imaging processing and target recognition to analyze CCD images of bubbles' back light-scattering so as to study the influence of bubbles and bubble density for back light-scattering. And then, based on scattering theory and theory of multiple light scattering, the light scattering properties of bubbles in wake were analyzed by simulation. Both the results of simulation and imaging processing technology validated that it was feasible to use the light wake homing bombs.
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