CN-122016705-A - Terahertz defect detection device based on multiple-input multiple-output array

CN122016705ACN 122016705 ACN122016705 ACN 122016705ACN-122016705-A

Abstract

The invention discloses a terahertz defect detection device based on a multi-input multi-output array, and relates to the technical field of testing. The device comprises a portal frame, a transmission table, a front end of a defect detection array, a microwave signal generation module and a data acquisition and control module, wherein the front end of the defect detection array is fixed on the portal frame and connected with the microwave signal generation module for detecting defects of a sample to be detected, the device comprises a terahertz signal generation array, a terahertz signal receiving array and a receiving and transmitting antenna module, array elements in the terahertz signal generation array and the terahertz signal receiving array are arranged in an equidistant and staggered mode, the transmission table is positioned below the front end of the defect detection array and used for placing the sample to be detected, and the portal frame, the transmission table, the front end of the defect detection array and the microwave signal generation module are respectively connected with the data acquisition and control module. The device has high integration level, high stability and high imaging efficiency, and realizes the rapid, efficient and nondestructive detection of the defects of the nonmetallic materials.

Inventors

LU BAITAO
JIA DINGHONG
LIANG XIAOLIN
DENG JIANQIN
WANG QI
SHI XIANBAO
SUN JIAWEN
CHEN ZHUO
WANG MO
WANG HUIMIN

Assignees

中电科思仪科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (7)

1. The terahertz defect detection device based on the multi-input multi-output array is characterized by comprising a portal frame, a transmission table, a defect detection array front end, a microwave signal generation module and a data acquisition and control module, wherein the defect detection array front end is fixed on the portal frame and connected with the microwave signal generation module, the transmission table is used for placing a sample to be detected and is positioned below the defect detection array front end, and the portal frame, the transmission table, the defect detection array front end and the microwave signal generation module are respectively connected with the data acquisition and control module.
2. The terahertz defect detection apparatus based on the multiple input and multiple output array according to claim 1, wherein a terahertz signal generating array, a terahertz signal receiving array and a transceiver antenna module are arranged in the front end of the defect detection array, and are used for detecting defects of a sample to be detected; The microwave signal generation module comprises a signal generation device, a first power divider, a second power divider and a reference signal module, wherein the signal generation device is used for generating a microwave radio frequency signal and a microwave local oscillator signal, the microwave radio frequency signal is input into the first power divider, and the microwave local oscillator signal is input into the second power divider; the first power divider divides a microwave radio frequency signal into two paths, one path is input into a multi-channel terahertz signal generating array and used for being used as a radio frequency excitation signal of each terahertz signal generating channel in the multi-channel terahertz signal generating array, the other path is input into a reference signal module and used for being used as a radio frequency excitation signal of the reference signal module; The terahertz signal generation array is internally provided with a first electronic switch and N paths of terahertz signal generation channels for generating multiple paths of terahertz radiation signals, and the terahertz signal receiving array is internally provided with a second electronic switch and N paths of terahertz signal receiving channels for generating multiple paths of intermediate frequency signals; The receiving and transmitting antenna module is respectively connected with the terahertz signal generating array and the terahertz signal receiving array, and is internally provided with 2N high-performance terahertz receiving and transmitting antennas for outputting terahertz radiation signals generated by the terahertz signal generating array and receiving terahertz echo signals in a detection space.
3. The terahertz defect detection apparatus based on the multiple input and multiple output array according to claim 2, wherein a first electronic switch and N-way terahertz signal generating channels are arranged in the terahertz signal generating array for generating multiple paths of terahertz radiation signals, and a second electronic switch and N-way terahertz signal receiving channels are arranged in the terahertz signal receiving array for generating multiple paths of intermediate frequency signals; In the terahertz signal receiving array, the second electronic switch is respectively connected with each path of terahertz signal receiving channel and is used for controlling the communication of the terahertz signal receiving channels, and the terahertz signal receiving channels amplify and multiply the input local oscillator excitation signals and perform frequency mixing conversion with terahertz echo signals to generate multiple paths of intermediate frequency signals.
4. The terahertz defect detecting device based on multiple input and multiple output arrays according to claim 3, wherein a plurality of array elements are arranged in the terahertz signal generating array and the terahertz signal receiving array at equal intervals, the array elements in the terahertz signal generating array and the array elements in the terahertz signal receiving array are arranged in a staggered mode and correspond to each other one by one, and the array elements in the terahertz signal generating array and the array elements corresponding to the array elements in the terahertz signal receiving array are staggered by half array element intervals.
5. The device for detecting terahertz defect based on multiple input and multiple output arrays according to claim 2, wherein the high-performance terahertz transceiver antenna is a pyramid horn antenna adopting a large beam width of an H-plane.
6. The device for detecting terahertz defects based on multiple-input multiple-output arrays according to claim 1, wherein the portal frame and the transmission platform together form a sample transmission platform.
7. The terahertz defect detecting device based on the multiple input and multiple output array according to claim 1, wherein the data acquisition and control module comprises a signal acquisition module and a central controller, wherein the signal acquisition module is respectively connected with the front ends of the microwave signal generation module and the defect detection array and is used for acquiring reference signals output by the microwave signal generation module and multichannel intermediate frequency signals output by the terahertz signal receiving array and inputting the reference signals and the multichannel intermediate frequency signals into the central controller, and the central controller is respectively connected with the microwave signal generation module, the signal acquisition module and the sample transmission platform and is used for controlling the microwave signal generation module, the signal acquisition module and the sample transmission platform.

Description

Terahertz defect detection device based on multiple-input multiple-output array Technical Field The invention relates to the technical field of testing, in particular to a terahertz defect detection device based on a multi-input multi-output array. Background The terahertz frequency band is an electromagnetic frequency band between the microwave and infrared regions of the electromagnetic spectrum, and has the unique advantages of rich carrying information, low photon energy, high space-time coherence, high use safety and the like, so that the terahertz wave is widely focused by technical personnel in the technical field of nondestructive testing in recent years, and particularly in the aspects of composite material structure imaging and defect detection. Defect detection and quality monitoring of nonmetallic materials such as composite materials, high polymer materials and the like in the preparation and use processes have become an indispensable important link. The existence of defects can affect the service life of the material member and even cause complete damage to the structure, so that the defect detection needs to be performed on the material member rapidly and accurately to determine the damage position, the damage type and the damage degree inside the material member. At present, the commonly adopted nondestructive detection methods for the defects of the materials are mostly detection modes such as ultrasonic and ray, but the conventional detection methods for various composite materials have certain limitations, for example, in the ultrasonic detection process, the problems of low detection efficiency, high detection difficulty of complex structures, pollution to the materials caused by coupling agents used in the detection process and the like exist, and the problems of high limitation of crack type defect detection, harm to human bodies caused by electromagnetic radiation and the like exist in the ray detection. Meanwhile, the terahertz defect detection imaging system in the prior art is mostly based on an optical generation source, is subjected to a testing mechanism, has long scanning time, and has the advantages of slower imaging speed, low imaging efficiency, lower dynamic range and more general image effect of material defect detection. In addition, the high-precision optical equipment adopted by the material defect nondestructive at present has strict environmental requirements, and the terahertz multi-input multi-output array adopted by the terahertz defect detection device has the characteristics of high imaging speed and low environmental requirements. Therefore, there is a need to propose a terahertz defect detection device based on a multiple-input multiple-output array, which can rapidly and efficiently realize nondestructive detection of material defects. Disclosure of Invention In order to solve the technical problems, the invention provides a terahertz defect detection device based on a multi-input multi-output array, which has high integration level, stable system and high imaging efficiency, realizes the rapid, efficient and nondestructive detection of the defects of nonmetallic materials, and provides technical support for the defect analysis of nonmetallic materials. The technical scheme adopted by the invention is as follows: The utility model provides a terahertz defect detection device based on multiple input multiple output array, includes portal frame, transmission platform, defect detection array front end, microwave signal generation module, data acquisition and control module, wherein, defect detection array front end is fixed in on the portal frame, is connected with microwave signal generation module, and the transmission platform is used for placing the sample that awaits measuring, is located defect detection array front end below, portal frame, transmission platform, defect detection array front end and microwave signal generation module are connected with data acquisition and control module respectively. Preferably, the front end of the defect detection array is provided with a terahertz signal generation array, a terahertz signal receiving array and a transceiver antenna module, which are used for detecting defects of the sample to be detected; The microwave signal generation module comprises a signal generation device, a first power divider, a second power divider and a reference signal module, wherein the signal generation device is used for generating a microwave radio frequency signal and a microwave local oscillator signal, the microwave radio frequency signal is input into the first power divider, and the microwave local oscillator signal is input into the second power divider; the first power divider divides a microwave radio frequency signal into two paths, one path is input into a multi-channel terahertz signal generating array and used for being used as a radio frequency excitation signal of each terahertz signal generating channel in the multi-chan