Polarized microwave thermoacoustic imaging device and method

A thermoacoustic imaging and microwave technology, which is used in measurement devices, analysis of solids using sonic/ultrasonic/infrasonic waves, and material analysis using sonic/ultrasonic/infrasonic waves to achieve broad application prospects.

Pending Publication Date: 2021-12-21
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Aiming at the deficiencies in the prior art, the polarized microwave thermoacoustic imaging device and method provided by the present invention solve the difficulty of accurately imaging some details when traditional microwave thermoacoustic imaging technology is directly used to image small and complex objects. The disadvantage of reconstruction is that in the imaging process, using polarization control technology, for each small imaging area or several pixel areas, only the image with the polarization direction at the maximum signal is

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  • Polarized microwave thermoacoustic imaging device and method
  • Polarized microwave thermoacoustic imaging device and method
  • Polarized microwave thermoacoustic imaging device and method

Examples

Experimental program
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Example Embodiment

[0042] Example 1:

[0043] like figure 1 , The polarization of the microwave thermoacoustic imaging apparatus comprising a microwave generator and the thermal acoustic signal acquisition and image forming apparatus; said microwave generator comprises a microwave source (1) and antenna (2); the signal acquisition and thermoacoustic imaging apparatus It includes an ultrasonic transducer (3), an amplifier (4), a data acquisition system (5), a computer (including image reconstruction software) (6) and polarization rotating means (7);

[0044]The microwave source (1) is used to generate a microwave signal of a particular frequency; the antenna (2) irradiate the microwave signal to the imaging region, so that the imaging sample produces a thermal sound signal; the ultrasonic transducer (3) is used The thermal sound signal generated by the imaging sample is received; the amplifier (4) enlarges the received thermal sound signal; the data acquisition system (5) is used to analyze the ampli...

Example Embodiment

[0047] Example 2:

[0048] In line with the apparatus in the first embodiment, the present embodiment provides a polarized microwave thermophonic imaging method, including the following steps:

[0049] S1, the polarization of the components contained in the microwave thermo-imaging device, preheating microwave thermochoes;

[0050] S2, start the microwave source, and irradiate the microwave signal to the imaging sample by the antenna to excite the generated thermal sound signal;

[0051] S3, the thermal sound signal of the imaging sample is acquired by the ultrasonic transducer, and the amplifier is transmitted to the data acquisition system, and is collected and stored in the computer;

[0052] S4, the thermal sound signal is analyzed by the image reconstruction software of the computer to obtain a thermal sound image of the imaging sample.

[0053] S5, the position of the imaging sample is not changed, and the polarized microwave thermophonic imaging is performed using the elect...

Example Embodiment

[0055] Example 3:

[0056] In this embodiment, a model of a microwave thermo-sound simulation imaging is performed on a model having a "meter" shape by the above apparatus and method. The internal fill medium of the model is a soy sauce. The model parameter is a single cylinder length of 3 cm. The bottom surface radius of the cylinder is 1 mm, and the imaging result of the four different polarization angles and the respective polarization direction microwave thermo-sound image is superimposed You can get the polarized microwave sound image, such as Figure 3 ~ 8 Disted, where image 3 Model diagram of the "rice" glyph model, Figure 4 ~ 8 The corresponding 0 degree, 45 degrees, 90 degrees, 135 degrees, respectively, and an image after four. According to the sound imaging results, it is possible to find that the electromagnetic wave generated by the wire polarization is that the thermal sound signal generated for the object is that the signal amplitude generated by the electric field ...

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Abstract

The invention discloses a polarized microwave thermoacoustic imaging device and a polarized microwave thermoacoustic imaging method. The device mainly comprises a microwave generating device, a polarized rotating device and a thermoacoustic signal acquisition and rapid imaging device. The device is based on the microwave thermoacoustic imaging technology and has the characteristics of high contrast, high resolution and no damage, the technology utilizes the characteristic that conductivity of an imaging medium is nonlinear and anisotropic, in the thermoacoustic imaging process, pulse microwaves are adopted to excite tissues to generate ultrasonic signals to carry out nondestructive imaging, the change of the field amplitude and the direction information of the microwave thermoacoustic signal is observed through a polarization regulation and control means, so the effect of visualizing the electromagnetic wave energy absorption polarization characteristic is achieved, direct observation of the conductivity anisotropy by utilizing the microwave thermoacoustic imaging technology is facilitated, and polarized microwave thermoacoustic imaging is realized.

Description

technical field [0001] The invention belongs to the field of microwave thermoacoustic imaging, and in particular relates to a polarized microwave thermoacoustic imaging device and method. Background technique [0002] Microwave thermoacoustic technology is a new technology based on the thermoacoustic effect in the 1980s. After continuous efforts in the industry, it has been applied in various fields and has shown great prospects. At present, the main application fields of this technology are biomedical imaging, sample detection, and research and development of new materials, among which the most widely used fields include microwave hyperthermia, microwave thermal imaging, and microwave thermoacoustic communication. The specific principle of microwave thermoacoustic imaging is as follows: when we use pulsed microwave excitation to radiate the sample to be tested, because the dielectric properties of the sample to be tested will cause the microwave energy to be absorbed, the a...

Claims

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Application Information

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IPC IPC(8): G01N29/24G01N29/06
CPCG01N29/2431G01N29/0654
Inventor 梁正王伟鹏乔帅淇谢实梦黄林
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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