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Pulse ultrasonic sound field detection device and method

A detection device, pulsed ultrasonic technology, applied to measuring devices, measuring ultrasonic/sonic/infrasonic, instruments, etc., can solve problems such as narrow application range, sound field interference, sound pressure and phase quantitative measurement that cannot be used in the sound field, and reach the frequency range wide range, lower detection cost, and high spatial resolution

Inactive Publication Date: 2017-11-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When measuring different probes, it is necessary to select different hydrophones according to the frequency and shape of the probes, and the scope of application is narrow
[0010] 2) Radiation force balance method: only the sound power value can be obtained through the radiation force balance method, and the sound field distribution of the probe cannot be obtained, and the radiation force balance method can only be applied to the measurement of continuous ultrasound emitted by an ultrasonic probe with a regular shape, and cannot measure pulsed ultrasound. sound field
[0011] 3) Schlieren method: The intuitive sound field distribution can be obtained through the schlieren method, but the sound pressure and phase of the sound field cannot be quantitatively measured
[0012] 4) The ultrasonic echo method is mainly used to evaluate the performance of the ultrasonic probe, and cannot quantitatively measure the sound field, and the introduction of standard test blocks will also cause interference to the sound field

Method used

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  • Pulse ultrasonic sound field detection device and method
  • Pulse ultrasonic sound field detection device and method
  • Pulse ultrasonic sound field detection device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A pulse ultrasonic sound field detection device, see figure 1 and figure 2 , the detection device includes: a signal generator 101, a power amplifier 102, a He-Ne (helium-neon) laser 103, a first convex lens 104, a second convex lens 105, a water tank 106, a stepping motor 107, a displacement platform 108, a sound-absorbing Material 109 , ultrasonic probe 110 , light shielding plate 111 , third convex lens 112 , mirror 113 , photodetector 114 , and oscilloscope 115 .

[0053] The signal generator 101 is connected to the power amplifier 102 , and the output signal is connected to the ultrasonic probe 110 . The signal generator 101 is used to generate an ultrasonic excitation signal. When the excitation signal is a periodic pulse, the ultrasonic probe 110 outputs pulsed ultrasonic waves. The power amplifier 102 is used to amplify the excitation signal to drive the ultrasonic probe 110 , and the ultrasonic probe 110 generates a pulsed sound field in the water tank 106 ....

Embodiment 2

[0059] A kind of pulse ultrasonic sound field detection method, see image 3 and Figure 4 , the detection method is based on the pulsed ultrasonic sound field detection device in embodiment 1, and the detection method comprises the following steps:

[0060] Ultrasonic wave is a kind of elastic wave. When propagating in the medium, the density of the medium will change, and then the refractive index of the medium will change periodically, forming an ultrasonic grating. When the laser light passes through the ultrasonic grating, the phase of the laser light is spatially modulated and diffracted.

[0061] According to the following formula:

[0062]

[0063] Among them, L 0 is the characteristic length of light diffracted by ultrasonic waves, λ s is the wavelength of ultrasonic waves in the medium, and λ is the wavelength of light in the medium. When the ultrasonic surface width L satisfies:

[0064] L≤L 0 / twenty two)

[0065] Laser light will undergo Raman-Ness diff...

Embodiment 3

[0092] Combined with the specific experimental equipment, Figure 5-Figure 6 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0093] The device parameters used in the present embodiment are: 633um He-Ne laser 103, 10MHz ultrasonic probe 110, the probe diameter is 10mm, the liquid in the water tank 106 is pure water, the wavelength range of photodetector 114 is 400-1000um, and the bandwidth is 400MHz, the focal length of the first convex lens 104 and the second convex lens 105 is 30mm, and the focal length of the third convex lens is 50mm. The center frequency of the excitation pulse of the signal generator 101 is 10MHz, the number of pulses is 10, and the signal amplitude is 400mV p-p , the amplification factor of the power amplifier 102 is 32dB. The obtained one-dimensional sound field and two-dimensional sound field sound pressure distribution are as follows: Figure 5 As shown, through the simulation c...

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Abstract

The invention discloses a pulse ultrasonic sound field detection device and method. The pulse ultrasonic sound field detection method comprises steps of: adjusting the distance between a photoelectric detector and a third convex lens in order that the diffracted light in each order focuses on the photoelectric detector; adjusting a light-shielding plate to shield the zero-order light and negative first-order diffracted light and to enable the positive first-order diffracted light to enter the photoelectric detector, recording the maximum value of the optical pulse amplitude as the positive first-order diffracted light intensity, wherein the ratio of the positive first-order diffracted light intensity to the total light intensity I satisfies the first specie of first-order first Bessel function; turning down the time scale of an oscilloscope, wherein the diffracted optical pulse signal includes an intensity modulation signal with a modulation frequency the same as the ultrasonic frequency; calculating the phase information according to the waveform of the modulation signal; obtaining the sound pressure and phase distribution of a ultrasonic sound field in the moving direction of a displacement platform; rotating a ultrasonic probe by a certain angle by using a stepping motor to obtain the sound pressure and phase distribution of the ultrasonic sound field in different rotation directions; and combining different angle detection data so as to obtain the sound pressure and phase distribution of the ultrasonic sound field in the plane.

Description

technical field [0001] The invention relates to the field of ultrasonic detection, in particular to a pulse ultrasonic sound field detection device and method. Background technique [0002] Ultrasonic testing technology is currently widely used in medical, industrial non-destructive testing, underwater imaging and other fields. In order to ensure the accuracy of the detection effect, it is necessary to detect the sound field excited by the probe before use. Therefore, the sound field of the probe sound field can be quantitatively obtained. Pressure and phase distribution are particularly important. [0003] According to the different ultrasonic excitation signals, ultrasound can be divided into continuous ultrasound excited by continuous signals and pulsed ultrasound excited by periodic pulse signals. At present, the ultrasonic sound field detection methods mainly include the following types: [0004] 1. Hydrophone method: The hydrophone probe is made of piezoelectric mate...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/00G01H9/002
Inventor 贾乐成陈世利白志亮曾周末
Owner TIANJIN UNIV
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