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A device and method for measuring the sensitivity of an air-coupled ultrasonic probe

An air-coupling and measuring device technology, applied in measuring devices, material analysis using sound waves/ultrasonic waves/infrasonic waves, instruments, etc., can solve problems such as large acoustic impedance mismatch and difficult calibration of air-coupled piezoelectric transducers, and achieve Improve accuracy, avoid complex task effects

Active Publication Date: 2021-11-05
CENT SOUTH UNIV
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Problems solved by technology

[0005] In order to solve the current attenuation of wave propagation in the air and the large acoustic impedance mismatch between the active piezoelectric ceramic material and the load medium, resulting in difficult technical problems in the calibration of air-coupled piezoelectric transducers, the present invention provides an accurate and simple Device and method for measuring sensitivity of air-coupled ultrasonic probe

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  • A device and method for measuring the sensitivity of an air-coupled ultrasonic probe
  • A device and method for measuring the sensitivity of an air-coupled ultrasonic probe
  • A device and method for measuring the sensitivity of an air-coupled ultrasonic probe

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Embodiment Construction

[0051] see figure 1 , first determine the spectral characteristics of the air-coupled transducer to be calibrated, since the amplitude of the obtained spectrum is arbitrary, it is called relative sensitivity. The experimental setup for determining the relative sensitivity of transducers is as figure 1 (a) shown. The contact transducer (that is, a transmitter with a wide bandwidth) is excited by a short pulse signal, thereby emitting sound waves into the aluminum test block, and the wave is transmitted to the air through the solid-air interface and is located on the other side of the test block. The air-coupled transducer receives. The time domain signal is measured during the experiment, and then the sensitivity is calculated in the frequency domain by fast Fourier transform.

[0052] SensitivityS vI (ω), by the velocity v of the output particle T (ω) and input current I in (ω) ratio to express as follows

[0053]

[0054] Based on this definition, figure 1 The outp...

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Abstract

The invention discloses a device and method for measuring the sensitivity of an air-coupled ultrasonic probe. First, an air-coupled transducer is used to receive a broadband pulse signal to evaluate its frequency spectrum; signal to calibrate its sensitivity amplitude. The invention considers the sensitivity of the transmitter, the influence of input pulse, attenuation and diffraction, and improves the accuracy of the calibrated sensitivity; in addition, the sensitivity amplitude is determined by comparing the measured displacements, avoiding the complicated task of describing the influence of electrical equipment.

Description

technical field [0001] The invention relates to a device and method for measuring the sensitivity of an air-coupled ultrasonic probe. Background technique [0002] Air-coupled ultrasonic testing is an important part of nondestructive testing / assessment techniques and has been successfully used to detect material defects, measure material nonlinear parameters, and evaluate material damage properties. When the fluid coupling device may cause damage to the material, the air-coupled non-contact method is more suitable than the water immersion method; and thanks to its fast scanning capability, the air-coupled non-contact method is more conducive to imaging testing than the contact method. The limiting factors for the application of air-coupled ultrasound are mainly the high degree of attenuation of sound waves in air and the excessive acoustic impedance mismatch between the piezoelectric material and the load medium. Research in recent years has mainly focused on improving the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/30
CPCG01N29/30
Inventor 张书增戴昭杰李雄兵张广栋
Owner CENT SOUTH UNIV
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