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Method for measuring acoustic nonlinear coefficient of material by using phase relation

A technology of nonlinear coefficient and phase relationship, which is used in measuring devices, analyzing materials, and using sonic/ultrasonic/infrasonic waves for material analysis. problems, to achieve the effect of simple scheme, extended experimental conditions, and high accuracy

Pending Publication Date: 2022-06-03
GUIZHOU INST OF TECH
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  • Application Information

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Problems solved by technology

However, since the amplitude formula of the second harmonic is obtained by solving the second-order perturbation expansion equation of the nonlinear acoustic wave equation, the expansion equation of the third order and above is ignored, which makes the second harmonic amplitude formula inaccurate , so that this equation can only be relatively reliable under the experimental conditions of small-amplitude excitation and short-distance propagation. Using this formula under the experimental conditions of high excitation amplitude, large nonlinear coefficient, and long-distance propagation will cause large errors
Other related methods for measuring nonlinear coefficients of materials are rarely reported. Sometimes KZK equations, Westervelt equations, and Blackstock equations are used for qualitative verification in experiments, but they are rarely used for quantitative measurement of nonlinear coefficients.

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  • Method for measuring acoustic nonlinear coefficient of material by using phase relation
  • Method for measuring acoustic nonlinear coefficient of material by using phase relation

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Effect test

Embodiment 1

[0025] A method for measuring the acoustic nonlinear coefficient of a material using a phase relationship, the material is liquid water, and the measurement steps are as follows:

[0026] 1) Input the 20-cycle sinusoidal electrical signal with the amplitude of 5.0Vpp (can be adjusted as needed) generated by the signal generator and the main frequency of 2.25MHz (related to the main frequency of the ultrasonic sensor) into the power amplifier (gain: 50dB), The output is sent to an ultrasonic sensor with a main frequency of 2.25MHz placed in the water. After the sensor generates ultrasonic signals, it propagates in the water, and placed in the water, it is received by the hydrophone controlled by the 3D position controller and transmitted to the oscilloscope or computer. Recorded in; its device frame diagram is as follows figure 2 shown. Meanwhile, the experimental device can be a commercial experimental system including signal generators, amplifiers, filters, etc.

[0027] 2...

Embodiment 2

[0033] A method for measuring the acoustic nonlinear coefficient of a material using a phase relationship, the material is solid aluminum, and the steps are as follows:

[0034]1) Input the 20-cycle sinusoidal electrical signal with the amplitude of 5.0Vpp (can be adjusted according to needs) generated by the signal generator with the main frequency of 2MHz (related to the main frequency of the ultrasonic sensor) into the power amplifier (gain: 50dB), and output In the ultrasonic sensor with the main frequency of 2MHz on one side of the flat aluminum block, the ultrasonic signal generated by the sensor propagates in the aluminum block, and is received by the broadband ultrasonic sensor placed on the other side of the aluminum block and transmitted to the oscilloscope or computer for recording. The sensor needs to cover at least the fundamental and second harmonic frequencies.

[0035] 2) The ultrasonic sensor in step 1) receives the displacement signal, and numerically derives...

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Abstract

The invention discloses a method for measuring an acoustic nonlinear coefficient of a material by using a phase relation, which comprises the following steps of: carrying out nondestructive testing on the material with mechanical nonlinearity by using limited amplitude ultrasound, and carrying out Hilbert transformation processing on a displacement signal or a mass point vibration speed signal obtained by detection and / or calculation to obtain a phase of a nonlinear signal; normalized angular frequency is obtained through numerical calculation, so that the acoustic nonlinear coefficient is measured according to the maximum value of the normalized angular frequency. The method is simpler, experimental conditions can be expanded, the nonlinear coefficient can still be measured under the conditions of farther distance, stronger excitation and larger nonlinear coefficient, and the test result is more accurate; the application condition of the invention can approach the generation position of the shock wave.

Description

technical field [0001] The invention relates to a method for measuring the acoustic nonlinear coefficient of a material, in particular to a method for measuring the acoustic nonlinear coefficient of a material by using a phase relationship. Background technique [0002] Compared with the second-order linear elastic parameters, the acoustic nonlinear coefficient is related to the higher-order elastic parameters of the material, and is more suitable for reflecting and evaluating the stress concentration, micro-damage, fatigue degree, etc. caused by slight changes in mechanical properties. Imaging with harmonics caused by this nonlinearity can not only improve the discrimination of micro-damaged or diseased tissue, but also improve the resolution of the image. [0003] Generally, when the finite amplitude ultrasound propagates in the material, it will excite higher harmonics, and the received signal is a distorted nonlinear ultrasound signal. Sometimes ultrasonic signals of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34G01N29/44G01N29/06
CPCG01N29/34G01N29/346G01N29/44G01N29/06
Inventor 张世功苏向东
Owner GUIZHOU INST OF TECH
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