CN116678850A - Terahertz nondestructive testing system and method - Google Patents

Abstract

The application provides a terahertz nondestructive testing system and a terahertz nondestructive testing method. The system comprises a signal acquisition device and an imaging control platform, wherein the acquisition device comprises a scanning signal generation unit, a sample moving unit and an echo signal receiving unit, and the imaging control platform comprises a parameter setting unit, a scanning mode unit, a motion control unit and a multi-stage image display unit. According to the application, the motion control unit controls the sample moving unit to move according to the scanning values sent by the parameter setting unit and the scanning modes sent by the scanning mode unit, so that the echo signal receiving unit receives echo signals corresponding to different preset positions of the sample to be detected, and the appearance of the sample to be detected is not limited. And the multi-level image display unit can integrate and process the echo signals, deeply analyze and calculate the echo signals, intuitively display the multi-dimensional detection information of the sample to be detected, and has high detection efficiency.

Description

A terahertz non-destructive testing system and method

technical field

The present application relates to the field of radar imaging, in particular to a terahertz non-destructive testing system and method.

Background technique

Due to its light weight, high strength, strong ductility, corrosion resistance, flexible preparation and easy processing, composite materials are widely used in aerospace heat insulation materials, solid rocket motor casings and missile radomes. However, due to the complex molding process of composite materials, many subtle processing uncertainties will make inevitable defects in the material structure. At the same time, various damages may also occur during the use of composite materials. The existence of these defects and damages will pose a great threat to the safety of composite materials.

Terahertz waves are located between microwave and infrared. Compared with microwave or millimeter wave imaging, terahertz waves can obtain better resolution because of their shorter wavelength and larger bandwidth. Moreover, terahertz waves are completely non-contact detection, which can achieve higher resolution than ultrasonic imaging. Therefore, terahertz imaging has become a new and important supplementary method for nondestructive testing. In addition, terahertz has high penetration for composite materials, and terahertz nondestructive testing technology can be used to realize internal nondestructive testing of composite materials.

Most of the existing nondestructive testing imaging methods are two-dimensional plane scanning, which has certain restrictions on the shape of the sample to be tested. Moreover, the various data generated by non-destructive testing are not integrated and analyzed and calculated in depth, and various specific testing information of the sample to be tested cannot be displayed intuitively, and the testing efficiency is low.

Contents of the invention

In order to solve the above technical problems, the present invention provides a terahertz nondestructive testing system and method, the specific scheme is as follows:

In the first aspect, an embodiment of the present application provides a terahertz nondestructive testing system. The terahertz nondestructive testing system includes a signal acquisition device and an imaging control platform. The acquisition device includes a scanning signal generation unit, a sample moving unit, and an echo sensor. A signal receiving unit, the imaging control platform includes a parameter setting unit, a scanning mode unit, a motion control unit, and a multi-level image display unit;

The scanning signal generation unit is used to generate a scanning signal, so that the scanning signal propagates to the sample to be tested on the sample moving unit and reflects the echo signal to the echo signal receiving unit;

The parameter setting unit is used to set a scan value corresponding to a first type of scan parameter, wherein the first type of scan parameter includes a scan signal coverage, a scan interval, and a scan speed;

The scanning mode unit is used to set a second type of scanning mode corresponding to the sample to be tested, wherein the second type of scanning mode includes planar scanning, cylindrical scanning and continuous acquisition scanning;

The motion control unit is used to control the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receiving echo signals corresponding to different preset positions of the sample to be tested;

The multi-level image display unit is configured to generate and display multi-level image information corresponding to the sample to be tested according to each echo signal transmitted by the echo signal receiving unit, wherein the multi-level image information includes a one-dimensional distance images, two-dimensional image information and three-dimensional image information.

According to a specific embodiment disclosed in the present application, the sample moving unit includes a two-dimensional translation stage and a turntable, and the two-dimensional translation stage is connected to the turntable;

The motion control unit is specifically used for:

receiving the scanning mode sent by the scanning mode unit;

If the scanning mode is planar scanning, controlling the two-dimensional translation stage to translate to realize the planar scanning of the sample to be tested by the scanning signal;

If the scanning mode is cylindrical scanning, controlling the two-dimensional translation stage to translate and/or controlling the turntable to rotate, so as to realize the cylindrical scanning of the sample to be tested by the scanning signal;

If the scanning mode is continuous acquisition scanning, the two-dimensional translation platform is controlled to translate and the turntable is controlled to rotate, so as to realize the continuous scanning of the sample to be tested by the scanning signal.

According to a specific implementation manner disclosed in the present application, the multi-level image display unit includes a one-dimensional distance image display subunit, and the multi-level image display unit is specifically used for:

receiving time-domain data corresponding to each echo signal transmitted by the echo signal receiving unit, wherein each echo signal corresponds to a different preset position of the sample to be tested;

converting each of the time-domain data into voltages and performing a third type of preset processing to obtain frequency-domain data and one-dimensional distance images corresponding to each of the preset positions, wherein the third type of preset processing includes Phase compensation, filtering and Fourier transform.

According to a specific implementation manner disclosed in the present application, the multi-level image display unit further includes a two-dimensional image display subunit, and the multi-level image display unit is specifically used for:

selecting the frequency domain data corresponding to all the preset positions within the preset range of each preset position as the target data;

Integrating the target data to obtain an intensity value corresponding to the current preset position within a preset range;

The intensity values corresponding to all preset positions are fused and displayed to obtain a two-dimensional image corresponding to the sample to be tested.

According to a specific implementation manner disclosed in the present application, the multi-level image display unit further includes a three-dimensional image display subunit, and the multi-level image display unit is specifically used for:

Performing three-dimensional splicing of each of the one-dimensional range images to obtain a three-dimensional matrix corresponding to the sample to be tested;

Receive the 3D coordinate display range and the number of distance image layers input by the user;

According to the coordinate display range and the number of distance image layers, slice information corresponding to different depth distances of the sample to be measured is displayed.

In the second aspect, an embodiment of the present application provides a terahertz nondestructive testing method, which is applied to the terahertz nondestructive testing system described in any one of the embodiments in the first aspect, and the terahertz nondestructive testing method is Detection methods include:

The scanning signal generation unit generates the scanning signal, so that the scanning signal propagates to the sample to be tested on the sample moving unit and reflects the echo signal to the echo signal receiving unit;

The parameter setting unit sets the scanning value corresponding to the scanning parameter of the first type, wherein the scanning parameter of the first type includes the coverage area of the scanning signal, the scanning interval and the scanning speed;

The scanning mode unit sets the second type of scanning mode corresponding to the sample to be tested, wherein the second type of scanning mode includes planar scanning, cylindrical scanning and continuous acquisition scanning;

The motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives the corresponding Describe the echo signals at different preset positions of the sample to be tested;

The multi-level image display unit generates and displays the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit, wherein the multi-level image information includes a one-dimensional range image, a two-dimensional image information and three-dimensional image information.

According to a specific embodiment disclosed in the present application, the sample moving unit includes a two-dimensional translation stage and a turntable, and the two-dimensional translation stage is connected to the turntable;

The motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, including:

receiving the scanning mode sent by the scanning mode unit;

If the scanning mode is planar scanning, controlling the two-dimensional translation stage to translate to realize the planar scanning of the sample to be tested by the scanning signal;

If the scanning mode is cylindrical scanning, controlling the two-dimensional translation stage to translate and/or controlling the turntable to rotate, so as to realize the cylindrical scanning of the sample to be tested by the scanning signal;

If the scanning mode is continuous acquisition scanning, the two-dimensional translation platform is controlled to translate and the turntable is controlled to rotate, so as to realize the continuous scanning of the sample to be tested by the scanning signal.

According to a specific implementation manner disclosed in the present application, the multi-level image display unit includes a one-dimensional range image display subunit;

The step of the multi-level image display unit generating and displaying the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit includes:

receiving time-domain data corresponding to each echo signal transmitted by the echo signal receiving unit, wherein each echo signal corresponds to a different preset position of the sample to be tested;

converting each of the time-domain data into voltages and performing a third type of preset processing to obtain frequency-domain data and one-dimensional distance images corresponding to each of the preset positions, wherein the third type of preset processing includes Phase compensation, filtering and Fourier transform.

According to a specific implementation manner disclosed in the present application, the multi-level image display unit further includes a two-dimensional image display subunit;

The step of the multi-level image display unit generating and displaying the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit includes:

selecting the frequency domain data corresponding to all the preset positions within the preset range of each preset position as the target data;

Integrating the target data to obtain an intensity value corresponding to the current preset position within a preset range;

The intensity values corresponding to all preset positions are fused and displayed to obtain a two-dimensional image corresponding to the sample to be tested.

According to a specific implementation manner disclosed in the present application, the multi-level image display unit further includes a three-dimensional image display subunit;

The step of the multi-level image display unit generating and displaying the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit includes:

Performing three-dimensional splicing of each of the one-dimensional range images to obtain a three-dimensional matrix corresponding to the sample to be tested;

Receive the 3D coordinate display range and the number of distance image layers input by the user;

According to the coordinate display range and the number of distance image layers, slice information corresponding to different depth distances of the sample to be measured is displayed.

Compared with the prior art, the present application has the following beneficial effects:

The terahertz nondestructive testing system provided by this application includes a signal acquisition device and an imaging control platform. The acquisition device includes a scanning signal generation unit, a sample moving unit, and an echo signal receiving unit. The imaging control platform includes a parameter setting unit, a scanning mode unit, and a motion control unit. unit, multi-level image display unit. The motion control unit in this application controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives signals corresponding to different preset positions of the sample to be tested. Echo signal, the shape of the sample to be tested is not limited. Moreover, the echo signal can be integrated and processed through the multi-level image display unit, and the in-depth analysis and calculation can be performed, and the multi-dimensional detection information of the sample to be tested can be intuitively displayed, and the detection efficiency is high.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of the composition of a terahertz nondestructive testing system provided by an embodiment of the present application;

FIG. 2 is a schematic flow chart of a terahertz nondestructive testing method provided in an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Hereinafter, the terms "comprising", "having" and their cognates that may be used in various embodiments of the present invention are only intended to represent specific features, numbers, steps, operations, elements, components or combinations of the foregoing, And it should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing or adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing possibilities.

In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, Unless clearly defined in various embodiments of the present invention.

Some implementations of the present application will be described in detail below in conjunction with the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Referring to FIG. 1 , FIG. 1 is a schematic composition diagram of a terahertz nondestructive testing system provided by an embodiment of the present application.

The terahertz nondestructive testing system includes a signal acquisition device 11 and an imaging control platform 12, the signal acquisition device 11 includes a scanning signal generation unit 111, a sample moving unit 112, and an echo signal receiving unit 113, and the imaging control platform 12 includes A parameter setting unit 121 , a scanning mode unit 122 , a motion control unit 123 , and a multi-level image display unit 124 .

The scan signal generation unit 111 is used to generate a scan signal, so that the scan signal propagates to the sample to be tested on the sample moving unit 112 and reflects an echo signal to the echo signal receiving unit 113 .

The parameter setting unit 121 is configured to set a scan value corresponding to a first type of scan parameter, wherein the first type of scan parameter includes a scan signal coverage, a scan interval, and a scan speed.

The scan mode unit 122 is configured to set a second type of scan mode corresponding to the sample to be tested, wherein the second type of scan mode includes planar scan, cylindrical scan and continuous acquisition scan.

The motion control unit 123 is used to control the sample moving unit 112 to move according to the scanning value sent by the parameter setting unit 121 and the scanning mode sent by the scanning mode unit 122, so that the The wave signal receiving unit 113 receives echo signals corresponding to different preset positions of the sample to be tested.

It should be noted that during specific implementation, the scanning speed adjustment can be realized in different ways:

1. The position of the sample to be tested remains unchanged, that is, the real-time position corresponding to the sample moving unit 112 carrying the sample to be tested does not change, and only the position of the scanning signal generating unit 111 is adjusted. The adjustment method includes but not limited to moving up and down the position of the scanning signal generating unit 111 or rotating the signal generating end of the scanning signal generating unit 111 along its fixed end, that is, adjusting the angle of the scanning signal unit;

2. The sample moving unit 112 may include a two-dimensional translation stage and a turntable, and the two-dimensional translation stage is connected to the turntable. In this case, the position or angle of the scanning signal generation unit 111 can also be kept unchanged, and the scanning speed can be adjusted by controlling the translational speed of the two-dimensional translation stage and/or the rotational angular speed of the turntable to move or rotate the sample to be measured Effect.

Based on similar reasons, the adjustment of the scanning mode can also be realized by controlling the two-dimensional translation stage and/or the turntable by the motion control unit 123 . Specifically, the motion control unit 123 receives the scanning mode sent by the scanning mode unit 122, then determines the second type corresponding to the scanning mode, and determines the specific moving mode of the sample moving unit 112 according to different second type scanning modes. :

If the scanning mode is planar scanning, controlling the two-dimensional translation stage to translate to realize the planar scanning of the sample to be tested by the scanning signal;

If the scanning mode is cylindrical scanning, controlling the two-dimensional translation stage to translate and/or controlling the turntable to rotate, so as to realize the cylindrical scanning of the sample to be tested by the scanning signal;

If the scanning mode is continuous acquisition scanning, the two-dimensional translation platform is controlled to translate and the turntable is controlled to rotate, so as to realize the continuous scanning of the sample to be tested by the scanning signal.

The multi-level image display unit 124 is used to generate and display the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit 113, wherein the multi-level image information includes a 2D distance image, 2D image information and 3D image information.

Specifically, the multi-level image display unit 124 includes but not limited to a one-dimensional range image display subunit 1241 , a two-dimensional image display subunit 1242 and a three-dimensional image display subunit 1243 .

The one-dimensional distance image display subunit 1241 is to filter, nonlinearity calibration and Fourier transform the time domain information returned by the scanning signal propagating to the preset position of the sample to be tested during the detection process, and obtain each preset The frequency domain data corresponding to the position and the one-dimensional range profile. Wherein, the one-dimensional distance image is the projection of all the echo signals of the two-dimensional image corresponding to the sample to be measured on its radial direction, that is, the vector sum. The internal structure information of the sample to be tested can be analyzed in real time through the one-dimensional distance image of each preset position.

The two-dimensional image display subunit 1242 uses the intensity value obtained by integrating the frequency domain data in the one-dimensional range image display subunit 1241, and by fusing and displaying the intensity values corresponding to all preset positions, the described The two-dimensional image corresponding to the sample to be tested.

The 3D image display subunit 1243 splices the 1D range image corresponding to the preset position and further processes it into a 3D image, and displays the 3D image in slices.

One or more of them can be selected for image display according to the user's actual usage requirements and specific application scenarios. The following describes the working principles or processes of the above subunits:

1. The one-dimensional distance image display subunit 1241 is specifically used for:

receiving time-domain data corresponding to each echo signal transmitted by the echo signal receiving unit 113, wherein each echo signal corresponds to a different preset position of the sample to be tested;

converting each of the time-domain data into voltages and performing a third type of preset processing to obtain frequency-domain data and one-dimensional distance images corresponding to each of the preset positions, wherein the third type of preset processing includes Phase compensation, filtering and Fourier transform.

The one-dimensional distance image display subunit 1241 can obtain the time domain signal corresponding to the current scanning position, that is, the preset position through the data acquisition card, and convert the time domain signal into a voltage value. Since radio frequency devices such as the scanning signal generation unit 111 in the acquisition device will introduce group delay to the broadband signal and seriously deteriorate the signal quality, it is necessary to use a nonlinearity calibration algorithm to perform phase compensation on the intermediate frequency signal after passing through the radio frequency device, thereby eliminating the wideband signal. The impact of radio frequency devices. Therefore, the converted voltage value needs to be calibrated for non-linearity. After the calibrated intermediate frequency signal is filtered and added with a Hanning window, Fourier transform is performed to obtain the one-dimensional range-wise image corresponding to each preset position. Among them, the Hanning window can greatly reduce the influence of side lobes.

2. The two-dimensional image display subunit 1242 is specifically used for:

selecting the frequency domain data corresponding to all the preset positions within the preset range of each preset position as the target data;

Integrating the target data to obtain an intensity value corresponding to the current preset position within a preset range;

The intensity values corresponding to all preset positions are fused and displayed to obtain a two-dimensional image corresponding to the sample to be tested.

The two-dimensional image display subunit 1242 uses the intervals before and after each preset position, that is, the integral value within the preset range as the intensity value of the preset position. Therefore, the defect type, size and corresponding defect position of the sample to be tested can be judged according to the intensity difference at different scanning positions, ie preset positions. The specific size of the preset range can be customized according to user requirements and specific application scenarios, and is not further limited here.

3. The 3D image display subunit 1243 is specifically used for:

Performing three-dimensional splicing of each of the one-dimensional range images to obtain a three-dimensional matrix corresponding to the sample to be tested;

Receive the 3D coordinate display range and the number of distance image layers input by the user;

According to the coordinate display range and the number of distance image layers, slice information corresponding to different depth distances of the sample to be measured is displayed.

The three-dimensional image display subunit 1243 performs three-dimensional splicing on the one-dimensional range image processed by the one-dimensional distance image display subunit 1241 to obtain a three-dimensional matrix of the sample to be tested. Further, you can set the coordinate display range, view the slice information at different distances from the distance image layer, so that you can more accurately judge whether there are debonding, delamination, holes and other defect types and positions inside the distance image layer . The three-dimensional image display subunit 1243 shown in FIG. 1 can set the coordinate display range, that is, the values of x and y, and the number of distance image layers on its display interface. Wherein, the number of distance image layers is the number of layers for dividing the three-dimensional image corresponding to the sample to be tested along the z-axis. For example, if the number of range image layers is 3, then 3 slice information corresponding to the sample to be tested can be obtained.

During specific implementation, the terahertz non-destructive testing system may also include a file storage unit, the file storage unit is used to save the collected intermediate frequency raw data in a specified path in the form of a BIN file, and at the same time save the processed three-dimensional matrix It is saved in MAT format, which is convenient for subsequent processing and playback of the data.

The motion control unit in this application controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives signals corresponding to different preset positions of the sample to be tested. Echo signal, the shape of the sample to be tested is not limited. Moreover, the echo signal can be integrated and processed through the multi-level image display unit, and the in-depth analysis and calculation can be performed, and the multi-dimensional detection information of the sample to be tested can be intuitively displayed, and the detection efficiency is high.

Corresponding to the above-mentioned system embodiment, see FIG. 2 , which is a schematic flowchart of a terahertz nondestructive testing method provided in an embodiment of the present application. The terahertz nondestructive testing method includes:

Step S201 , the scanning signal generation unit generates a scanning signal, so that the scanning signal propagates to the sample to be tested on the sample moving unit and reflects the echo signal to the echo signal receiving unit.

In step S202, the parameter setting unit sets a scan value corresponding to a first type of scan parameter, wherein the first type of scan parameter includes a scan signal coverage, a scan interval, and a scan speed.

Step S203, the scanning mode unit sets a second type of scanning mode corresponding to the sample to be tested, wherein the second type of scanning mode includes planar scanning, cylindrical scanning and continuous acquisition scanning.

Step S204, the motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives Echo signals to different preset positions corresponding to the sample to be tested.

During specific implementation, the sample moving unit includes a two-dimensional translation stage and a turntable, and the two-dimensional translation stage is connected to the turntable;

The motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, including:

receiving the scanning mode sent by the scanning mode unit;

If the scanning mode is planar scanning, controlling the two-dimensional translation stage to translate to realize the planar scanning of the sample to be tested by the scanning signal;

If the scanning mode is cylindrical scanning, controlling the two-dimensional translation stage to translate and/or controlling the turntable to rotate, so as to realize the cylindrical scanning of the sample to be tested by the scanning signal;

If the scanning mode is continuous acquisition scanning, the two-dimensional translation platform is controlled to translate and the turntable is controlled to rotate, so as to realize the continuous scanning of the sample to be tested by the scanning signal.

Step S205, the multi-level image display unit generates and displays the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit, wherein the multi-level image information includes a one-dimensional distance image , two-dimensional image information and three-dimensional image information.

During specific implementation, the multi-level image display unit includes a one-dimensional distance image display subunit;

The step of the multi-level image display unit generating and displaying the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit includes:

receiving time-domain data corresponding to each echo signal transmitted by the echo signal receiving unit, wherein each echo signal corresponds to a different preset position of the sample to be tested;

converting each of the time-domain data into voltages and performing a third type of preset processing to obtain frequency-domain data and one-dimensional distance images corresponding to each of the preset positions, wherein the third type of preset processing includes Phase compensation, filtering and Fourier transform.

During specific implementation, the multi-level image display unit further includes a two-dimensional image display subunit;

The step of the multi-level image display unit generating and displaying the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit includes:

selecting the frequency domain data corresponding to all the preset positions within the preset range of each preset position as the target data;

Integrating the target data to obtain an intensity value corresponding to the current preset position within a preset range;

The intensity values corresponding to all preset positions are fused and displayed to obtain a two-dimensional image corresponding to the sample to be tested.

During specific implementation, the multi-level image display unit further includes a three-dimensional image display subunit;

The step of the multi-level image display unit generating and displaying the multi-level image information corresponding to the sample to be tested according to the echo signals transmitted by the echo signal receiving unit includes:

Performing three-dimensional splicing of each of the one-dimensional range images to obtain a three-dimensional matrix corresponding to the sample to be tested;

Receive the 3D coordinate display range and the number of distance image layers input by the user;

According to the coordinate display range and the number of distance image layers, slice information corresponding to different depth distances of the sample to be measured is displayed.

For the specific implementation process of the terahertz non-destructive testing method provided in the present application, reference may be made to the specific implementation process of the terahertz non-destructive testing system provided in the above-mentioned embodiments, which will not be repeated here.

In the terahertz nondestructive testing method provided by this application, the motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives the corresponding sample to be tested There are no restrictions on the shape of the sample to be tested for the echo signals at different preset positions. Moreover, the echo signal can be integrated and processed through the multi-level image display unit, and the in-depth analysis and calculation can be performed, and the multi-dimensional detection information of the sample to be tested can be intuitively displayed, and the detection efficiency is high.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may also be implemented in other ways. The device embodiments described above are only illustrative. For example, the flowcharts and structural diagrams in the accompanying drawings show the possible implementation architecture and functions of devices, methods and computer program products according to multiple embodiments of the present invention. and operation. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It is also to be noted that each block of the block diagrams and/or flow diagrams, and combinations of blocks in the block diagrams and/or flow diagrams, can be implemented by a dedicated hardware-based system that performs the specified function or action may be implemented, or may be implemented by a combination of special purpose hardware and computer instructions.

In addition, each functional module or unit in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention.

Claims (10)

1. The terahertz nondestructive testing system is characterized by comprising signal acquisition equipment and an imaging control platform, wherein the acquisition equipment comprises a scanning signal generation unit, a sample moving unit and an echo signal receiving unit, and the imaging control platform comprises a parameter setting unit, a scanning mode unit, a motion control unit and a multi-stage image display unit;

the scanning signal generating unit is used for generating a scanning signal so that the scanning signal propagates to the sample to be detected on the sample moving unit and reflects an echo signal to the echo signal receiving unit;

the parameter setting unit is used for setting a scanning value corresponding to a first type of scanning parameter, wherein the first type of scanning parameter comprises a coverage range, a scanning interval and a scanning speed of a scanning signal;

the scanning mode unit is used for setting a second type of scanning mode corresponding to the sample to be detected, wherein the second type of scanning mode comprises plane scanning, cylindrical scanning and continuous acquisition scanning;

the motion control unit is used for controlling the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives echo signals corresponding to different preset positions of the sample to be detected;

the multi-stage image display unit is used for generating and displaying multi-stage image information corresponding to the sample to be detected according to each echo signal transmitted by the echo signal receiving unit, wherein the multi-stage image information comprises a one-dimensional range profile, two-dimensional image information and three-dimensional image information.

2. The terahertz nondestructive testing system according to claim 1, wherein the sample moving unit includes a two-dimensional translation stage and a turntable, the two-dimensional translation stage being connected to the turntable;

the motion control unit is specifically configured to:

receiving the scanning mode sent by the scanning mode unit;

if the scanning mode is plane scanning, controlling the two-dimensional translation stage to translate so as to realize plane scanning of the sample to be detected by the scanning signal;

if the scanning mode is cylindrical scanning, controlling the two-dimensional translation stage to translate and/or controlling the turntable to rotate so as to realize cylindrical scanning of the sample to be detected by the scanning signal;

and if the scanning mode is continuous acquisition scanning, controlling the two-dimensional translation stage to translate and controlling the turntable to rotate so as to realize continuous scanning of the sample to be detected by the scanning signals.

3. The terahertz nondestructive inspection system of claim 1 wherein the multi-stage image display unit includes a one-dimensional range profile display subunit, the multi-stage image display unit being specifically configured to:

receiving time domain data corresponding to each echo signal transmitted by the echo signal receiving unit, wherein each echo signal corresponds to different preset positions of the sample to be detected;

converting each time domain data into voltage and performing a third type of preset processing to obtain frequency domain data and a one-dimensional range profile corresponding to each preset position, wherein the third type of preset processing comprises phase compensation, filtering and Fourier transformation.

4. The terahertz nondestructive inspection system of claim 3 wherein the multi-stage image display unit further comprises a two-dimensional image display subunit, the multi-stage image display unit being specifically configured to:

selecting all frequency domain data corresponding to all preset positions in a preset range of each preset position as target data;

integrating the target data to obtain an intensity value corresponding to the current preset position in a preset range;

and carrying out fusion display on the intensity values corresponding to all the preset positions to obtain a two-dimensional image corresponding to the sample to be detected.

5. The terahertz nondestructive inspection system according to claim 3, wherein the multi-stage image display unit further comprises a three-dimensional image display subunit, the multi-stage image display unit being specifically configured to:

three-dimensional stitching is carried out on each one-dimensional distance image, and a three-dimensional matrix corresponding to the sample to be detected is obtained;

receiving a three-dimensional coordinate display demonstration girth input by a user and the number of layers of the range profile;

and displaying slice information corresponding to different depth distances of the sample to be detected according to the coordinate display demonstration circle and the number of layers of the range profile.

6. A terahertz nondestructive testing method, which is applied to the terahertz nondestructive testing system according to any one of claims 1 to 5, and which comprises:

the scanning signal generating unit generates a scanning signal so that the scanning signal propagates to the sample to be detected on the sample moving unit and reflects an echo signal to the echo signal receiving unit;

the method comprises the steps that a parameter setting unit sets a scanning value corresponding to a first type of scanning parameter, wherein the first type of scanning parameter comprises a coverage range, a scanning interval and a scanning speed of a scanning signal;

the scanning mode unit sets a second type of scanning mode corresponding to the sample to be detected, wherein the second type of scanning mode comprises plane scanning, cylindrical scanning and continuous acquisition scanning;

the motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, so that the echo signal receiving unit receives echo signals corresponding to different preset positions of the sample to be detected;

and the multi-stage image display unit generates and displays multi-stage image information corresponding to the sample to be detected according to each echo signal transmitted by the echo signal receiving unit, wherein the multi-stage image information comprises a one-dimensional range profile, two-dimensional image information and three-dimensional image information.

7. The terahertz nondestructive testing method according to claim 6, wherein the sample moving unit includes a two-dimensional translation stage and a turntable, the two-dimensional translation stage being connected to the turntable;

the motion control unit controls the sample moving unit to move according to the scanning value sent by the parameter setting unit and the scanning mode sent by the scanning mode unit, and the motion control unit comprises the following steps:

receiving the scanning mode sent by the scanning mode unit;

if the scanning mode is plane scanning, controlling the two-dimensional translation stage to translate so as to realize plane scanning of the sample to be detected by the scanning signal;

if the scanning mode is cylindrical scanning, controlling the two-dimensional translation stage to translate and/or controlling the turntable to rotate so as to realize cylindrical scanning of the sample to be detected by the scanning signal;

and if the scanning mode is continuous acquisition scanning, controlling the two-dimensional translation stage to translate and controlling the turntable to rotate so as to realize continuous scanning of the sample to be detected by the scanning signals.

8. The terahertz nondestructive testing method according to claim 6, wherein the multi-stage image display unit includes a one-dimensional range profile display subunit;

the step of generating and displaying the multi-level image information corresponding to the sample to be tested by the multi-level image display unit according to each echo signal transmitted by the echo signal receiving unit comprises the following steps:

receiving time domain data corresponding to each echo signal transmitted by the echo signal receiving unit, wherein each echo signal corresponds to different preset positions of the sample to be detected;

converting each time domain data into voltage and performing a third type of preset processing to obtain frequency domain data and a one-dimensional range profile corresponding to each preset position, wherein the third type of preset processing comprises phase compensation, filtering and Fourier transformation.

9. The terahertz nondestructive testing method according to claim 8, wherein the multi-stage image display unit further includes a two-dimensional image display subunit;

the step of generating and displaying the multi-level image information corresponding to the sample to be tested by the multi-level image display unit according to each echo signal transmitted by the echo signal receiving unit comprises the following steps:

selecting all frequency domain data corresponding to all preset positions in a preset range of each preset position as target data;

integrating the target data to obtain an intensity value corresponding to the current preset position in a preset range;

and carrying out fusion display on the intensity values corresponding to all the preset positions to obtain a two-dimensional image corresponding to the sample to be detected.

10. The terahertz nondestructive testing method according to claim 8, wherein the multi-stage image display unit further includes a three-dimensional image display subunit;

the step of generating and displaying the multi-level image information corresponding to the sample to be tested by the multi-level image display unit according to each echo signal transmitted by the echo signal receiving unit comprises the following steps:

three-dimensional stitching is carried out on each one-dimensional distance image, and a three-dimensional matrix corresponding to the sample to be detected is obtained;

receiving a three-dimensional coordinate display demonstration girth input by a user and the number of layers of the range profile;

and displaying slice information corresponding to different depth distances of the sample to be detected according to the coordinate display demonstration circle and the number of layers of the range profile.