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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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  • 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 selected, thus providing a fast, lossless and the imaging results are close to the real method; this invention can not only perform non-destructive imaging on tiny structures, but also provide an effective means for observing the field amplitude and direction information distribution of the microwave field, so as to achieve the visualization effect of the energy field of electromagnetic waves. Contribute to the direct observation of the electromagnetic field polarization direction and electric field strength in the field of microwave detection

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  • Polarized microwave thermoacoustic imaging device and method

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Embodiment 1

[0043] Such as figure 1 As shown, the polarized microwave thermoacoustic imaging device includes a microwave generator and a thermoacoustic signal acquisition and imaging device; the microwave generator includes a microwave source (1) and an antenna (2); the thermoacoustic signal acquisition and imaging device Including an ultrasonic transducer (3), an amplifier (4), a data acquisition system (5), a computer (including image reconstruction software) (6) and a polarization rotation device (7);

[0044]The microwave source (1) is used to generate a microwave signal of a specific frequency; the antenna (2) irradiates the microwave signal to the imaging area, thereby exciting the imaging sample to generate a thermoacoustic signal; the ultrasonic transducer (3) uses for receiving and collecting thermoacoustic signals generated by imaging samples; the amplifier (4) amplifies the received thermoacoustic signals; the data acquisition system (5) is used for data processing and analysis...

Embodiment 2

[0048] Corresponding to the device in the above-mentioned embodiment 1, this embodiment provides a polarized microwave thermoacoustic imaging method, including the following steps:

[0049] S1. Connect the components included in the polarized microwave thermoacoustic imaging device to preheat the microwave thermoacoustic;

[0050] S2. Start the microwave source, and irradiate the microwave signal to the imaging sample through the antenna to generate a thermoacoustic signal;

[0051] S3. The thermoacoustic signal of the imaging sample is collected by the ultrasonic transducer, amplified by the amplifier, transmitted to the data acquisition system, collected and stored in the computer;

[0052] S4. Analyzing and processing the thermoacoustic signal through the image reconstruction software of the computer, so as to obtain the thermoacoustic image of the imaging sample.

[0053] S5. Keep the position of the imaging sample unchanged, and use the polarization rotation device to ro...

Embodiment 3

[0056] In this embodiment, microwave thermoacoustic simulation imaging is carried out on a model in the shape of "米" by using the above-mentioned device and method. The internal filling medium of the model is edible soy sauce. The model parameters are that the length of a single cylinder is 3cm, and the radius of the bottom surface of the cylinder is 1mm. The simulation results obtained imaging results of four different polarization angles and the superposition of microwave thermoacoustic images in each polarization direction. Polarized microwave thermoacoustic images can be obtained, such as Figure 3-8 shown, where image 3 is the model diagram of the "m"-shaped model, Figure 4-8 Corresponding to 0 degree, 45 degree, 90 degree, 135 degree and the superimposed image of the four respectively. According to the results of thermoacoustic imaging, it can be found that for linearly polarized electromagnetic waves, the thermoacoustic signals generated for objects are as follows: ...

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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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