Inversion Method of Bubble Group Size Distribution Parameters in Water Based on Nonlinear Parameter Measurement

A size distribution and parameter measurement technology, applied in measurement devices, particle size analysis, particle and sedimentation analysis, etc., can solve the problems of difficult inversion, unable to obtain transfer matrix, etc., achieve high experimental value and application value, simple calculation, Accurate results

Active Publication Date: 2021-10-01
HARBIN ENG UNIV
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Problems solved by technology

Most studies on the nonlinear scattering cross-section method do not consider the influence of non-resonant bubbles, or the transfer matrix with a good condition number cannot be obtained after the integral is discretized, and the inversion is difficult, so it has not been applied yet

Method used

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  • Inversion Method of Bubble Group Size Distribution Parameters in Water Based on Nonlinear Parameter Measurement
  • Inversion Method of Bubble Group Size Distribution Parameters in Water Based on Nonlinear Parameter Measurement
  • Inversion Method of Bubble Group Size Distribution Parameters in Water Based on Nonlinear Parameter Measurement

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example

[0063] Example parameters are set as follows: water medium density ρ 0 =1000kg / m 3 , the speed of sound in water c 0 = 1500m / s, the length R of the mixed medium sample = 1m. That is to say, the hydrophone is placed 1m away from the transmitting transducer. The assumed bubble radius distribution obeys the power exponential distribution N(R 0 ) = R 0 -4 .

[0064] Considering that the radius range of the bubble is 15-500μm, the number of radius points N=1000; the excitation frequency range is 0.1-1000kHz, the number of frequency points M=1000; the damping coefficient δ=0.1; the specific heat ratio γ=1.4; the hydrostatic pressure P 0 =1.088×10 5 . Solve Equation (2) and establish Equation (3) (4) to get the nonlinear coefficient vector β. Construct the transfer matrix K according to formula (5), and get it by least squares inversion Inversion effect such as figure 2 shown.

[0065] Similarly, changing the assumed bubble size distribution N(R 0 ) obeys a Gaussian di...

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Abstract

The invention provides a parameter inversion method for bubble group size distribution in water based on nonlinear parameter measurement. The non-linear coefficients are obtained by emitting a single-frequency pulse signal in the water medium containing bubbles, and the parameters of the bubble size distribution are inverted by using the relationship between the nonlinear coefficients and the bubble size distribution. The method of the invention can eliminate the influence irrelevant to the characteristics of the bubble itself (such as the boundary and other scattering bodies, etc.), has the characteristics of high accuracy and simple calculation, and has high application value.

Description

technical field [0001] The invention relates to a method for determining the distribution of bubble radius in water, in particular to a method for acoustic inversion of bubble group size distribution parameters by using the nonlinear coefficient of bubble-containing water medium. Background technique [0002] The study of water medium containing bubbles has a wide range of application significance in various fields. For example, in medicine, bubble contrast agents are used to improve physiological tissue imaging in the field of medical ultrasound; in industry, they are used for leak detection in underwater oil and gas fields; in the field of underwater acoustics, they are used to improve the conversion efficiency of acoustic parameter arrays; and to identify wake bubbles when ships are sailing, etc. . [0003] The size, distribution and concentration of bubbles in the gas-liquid mixture will not only affect the physical properties of the mixture, but also affect its nonline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
CPCG01N15/02
Inventor 时洁刘宇林时胜国张昊阳李洪道邓安定孙闻伯田鸿兴李松陈广智
Owner HARBIN ENG UNIV
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