Vibration object nondestructive testing system and method based on electromagnetic waves

Abstract

The invention provides a vibrating object nondestructive detection system and method based on electromagnetic waves, and relates to the technical field of detection. The system comprises an electromagnetic wave transceiver, a gain antenna, a vibration object and an upper computer, the upper computer, the electromagnetic wave transceiver and the gain antenna are sequentially connected, and an opening of the gain antenna faces the vibration object; wherein electromagnetic waves emitted by the electromagnetic wave transceiver are concentrated by the gain antenna and then irradiated to the surface of a vibration object, and the electromagnetic wave transceiver receives electromagnetic wave echo signals reflected by the vibration object and sends the electromagnetic wave echo signals to the upper computer; the upper computer carries out time domain analysis and frequency domain analysis on the electromagnetic wave echo signals to obtain the vibration amplitude and the vibration frequency of the vibration object respectively, whether the vibration object is damaged or not is judged according to the vibration amplitude and the vibration frequency, and nondestructive testing of the vibration object is achieved.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a system and method for nondestructive detection of vibrating objects based on electromagnetic waves. Background Art

[0002] In the related technologies, the detection of objects mainly uses ultrasound to penetrate into the object for detection or uses X-rays to irradiate the object. Ultrasonic detection has very high requirements on the shape of the object being tested and the grain size of the defect position; while X-rays are not easy to operate and use due to their strong radiation, high equipment prices, limited application occasions, and destructive effects on the object being tested. Summary of the invention

[0003] In view of this, the present application provides a system and method for nondestructive detection of vibrating objects based on electromagnetic waves.

[0004] In a first aspect, an embodiment of the present application provides a nondestructive detection system for a vibrating object based on electromagnetic waves, comprising: an electromagnetic wave transceiver, a gain antenna, a vibrating object, and a host computer, wherein the host computer, the electromagnetic wave transceiver, and the gain antenna are connected in sequence, and an opening of the gain antenna faces the vibrating object;

[0005] Among them, the electromagnetic waves emitted by the electromagnetic wave transceiver are concentrated by the gain antenna and then irradiated to the surface of the vibrating object. The electromagnetic wave transceiver receives the electromagnetic wave echo signal reflected by the vibrating object and sends it to the host computer; the host computer performs time domain analysis and frequency domain analysis on the electromagnetic wave echo signal to respectively obtain the vibration amplitude and vibration frequency of the vibrating object, and determines whether the vibrating object is damaged according to the vibration amplitude and the vibration frequency, thereby realizing non-destructive detection of the vibrating object.

[0006] In a second aspect, an embodiment of the present application provides a nondestructive detection method for a vibrating object based on electromagnetic waves, which is applied to a nondestructive detection system for a vibrating object based on electromagnetic waves as in the first aspect, and the method includes:

[0007] Obtaining sampling parameters of the electromagnetic wave transceiver device;

[0008] Controlling the vibrating object to be in an uninterrupted vibrating state;

[0009] Controlling the electromagnetic wave transceiver to transmit electromagnetic waves to the surface of the vibrating object, so that the vibrating object reflects the electromagnetic waves;

[0010] Controlling the electromagnetic wave transceiver to collect the reflected electromagnetic wave echo signal according to the sampling parameters;

[0011] The host computer is controlled to perform time domain analysis and frequency domain analysis on the electromagnetic wave echo signal to obtain the vibration amplitude and vibration frequency of the vibrating object respectively, and whether the vibrating object is damaged is judged according to the vibration amplitude and the vibration frequency to achieve nondestructive detection of the vibrating object.

[0012] In the embodiment of the present application, by emitting electromagnetic waves to the vibrating object and collecting echo data, the vibration amplitude information and vibration frequency information of the vibrating object are obtained, and by judging the abnormal vibration amplitude and vibration frequency, it is determined whether the vibrating object is damaged, thereby realizing nondestructive testing. The present application can penetrate into the internal environment of the object being tested, and can realize efficient detection without damaging the object being tested. In addition, the present application does not require expensive ultrasonic detection equipment such as microphone array detection, optical fiber detection, laser detection, and highly radioactive X-ray photography equipment, and has low requirements on the shape of the object being tested and the grain size of the defect position, and has low cost.

[0013] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 A schematic structural diagram of a nondestructive testing system for vibrating objects based on electromagnetic waves according to an embodiment of the present application is shown;

[0016] Figure 2 One of the flow charts of the nondestructive testing method of a vibrating object based on electromagnetic waves according to an embodiment of the present application is shown;

[0017] Figure 3 The second flow chart of the nondestructive testing method of a vibrating object based on electromagnetic waves according to an embodiment of the present application is shown;

[0018] FIG4( a ) is a schematic diagram showing a time domain image of an intact vibrating object according to an embodiment of the present application;

[0019] FIG4( b ) is a schematic diagram showing a time domain image of a damaged vibrating object according to an embodiment of the present application;

[0020] FIG5( a ) is a schematic diagram showing a frequency domain image of an intact vibrating object according to an embodiment of the present application;

[0021] FIG5( b ) shows a schematic diagram of a frequency domain image of a damaged vibrating object according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0023] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0024] The following, in conjunction with the accompanying drawings, describes in detail the system and method for nondestructive testing of vibrating objects based on electromagnetic waves provided in the embodiments of the present application through specific embodiments and their application scenarios.

[0025] The present application embodiment provides a nondestructive detection system for a vibrating object 3 based on electromagnetic waves, such as Figure 1 As shown, the system includes: an electromagnetic wave transceiver 1, a booster antenna 2, a vibrating object 3 (i.e., the object to be detected), and a host computer 4. The host computer 4, the electromagnetic wave transceiver 1, and the booster antenna 2 are connected in sequence, and the opening of the booster antenna 2 faces the vibrating object 3;

[0026] Among them, the electromagnetic waves emitted by the electromagnetic wave transceiver 1 are concentrated by the gain antenna 2 and then irradiated onto the surface of the vibrating object 3. The electromagnetic wave transceiver 1 receives the electromagnetic wave echo signal reflected by the vibrating object 3 and sends it to the host computer 4; the host computer 4 performs time domain analysis and frequency domain analysis on the electromagnetic wave echo signal to obtain the vibration amplitude and vibration frequency of the vibrating object 3 respectively, and determines whether the vibrating object 3 is damaged based on the vibration amplitude and vibration frequency, thereby realizing non-destructive detection of the vibrating object 3.

[0027] In this embodiment, the nondestructive detection system of the vibrating object 3 based on electromagnetic waves includes an electromagnetic wave transceiver 1, a gain antenna 2, a vibrating object 3 and a host computer 4 (i.e., a control computer), and the host computer 4, the electromagnetic wave transceiver 1 and the gain antenna 2 are connected in sequence. In one embodiment, the electromagnetic wave transceiver 1 includes an electromagnetic wave transceiver, a spectrum expansion module and a frequency extender connected in sequence, and the waveguide output port of the frequency extender is connected to the gain antenna 2, wherein the spectrum expansion module enhances the anti-interference ability and transmission distance of the signal by increasing the bandwidth of the signal, and the frequency extender enables high-frequency signals to be accurately measured and analyzed by instruments in lower frequency bands.

[0028] The electromagnetic wave emitted by the electromagnetic wave transceiver 1 has a frequency of an electromagnetic wave band. The electromagnetic wave is concentrated by the gain antenna 2 and irradiated onto the surface of the vibrating object 3. The opening of the gain antenna 2 faces the vibrating object 3. The gain antenna 2 can enhance the directivity of electromagnetic wave transmission and reduce electromagnetic loss. The gain antenna 2 can be a standard gain horn antenna or other antennas with this function.

[0029] After the electromagnetic wave irradiates the surface of the vibrating object 3, it is reflected by the vibrating object 3. The electromagnetic wave transceiver 1 receives the electromagnetic wave echo signal (i.e., the vibration signal) reflected by the vibrating object 3 and sends it to the host computer 4. The host computer 4 performs time domain analysis and frequency domain analysis on the electromagnetic wave echo signal to obtain the vibration amplitude and vibration frequency of the vibrating object 3, and then determines whether the vibrating object 3 is damaged based on whether the vibration amplitude and vibration frequency are abnormal, thereby realizing non-destructive detection of the vibrating object 3.

[0030] In one embodiment of the present application, the host computer 4 has a visualization interface, and the vibration amplitude and vibration frequency of the vibrating object 3 can be displayed in the visualization interface, so that the user can intuitively understand the vibration amplitude and vibration frequency of the vibrating object 3.

[0031] In the embodiment of the present application, the vibration amplitude information and vibration frequency information of the vibrating object are obtained by emitting electromagnetic waves to the vibrating object and collecting echo data. By judging the abnormal vibration amplitude and vibration frequency, it is determined whether the vibrating object is damaged, thereby realizing nondestructive testing. The present application can penetrate into the internal environment of the object being tested, and can realize efficient detection without damaging the object being tested. In addition, the present application does not require expensive ultrasonic detection equipment such as microphone array detection, optical fiber detection, laser detection, and highly radioactive X-ray photography equipment. It does not have high requirements on the shape of the object being tested and the grain size of the defect position, and has low cost.

[0032] In addition, due to the high resolution of electromagnetic waves, which can reach the centimeter or even millimeter level, the present application can meet the needs of engineering detection; electromagnetic wave detection is a non-contact detection method that can detect vibrating objects without interfering with the object being measured; in addition, electromagnetic waves also have the characteristics of strong anti-interference ability, safety and reliability, fast detection speed, good continuity, and large detection range, which improves the detection effect of vibrating objects.

[0033] The embodiment of the present application provides a nondestructive detection method for a vibrating object based on electromagnetic waves, which is applied to the nondestructive detection system for a vibrating object based on electromagnetic waves in the above embodiment, such as Figure 2 As shown, the method includes:

[0034] S201, obtaining sampling parameters of an electromagnetic wave transceiver device;

[0035] S202, controlling the vibrating object to be in a continuous vibration state;

[0036] S203, controlling the electromagnetic wave transceiver to transmit electromagnetic waves to the surface of the vibrating object, and the vibrating object reflects the electromagnetic waves;

[0037] S204, controlling the electromagnetic wave transceiver to collect the reflected electromagnetic wave echo signal according to the sampling parameters;

[0038] S205, controlling the host computer to perform time domain analysis and frequency domain analysis on the electromagnetic wave echo signal, respectively obtaining the vibration amplitude and vibration frequency of the vibrating object, judging whether the vibrating object is damaged according to the vibration amplitude and vibration frequency, and realizing non-destructive detection of the vibrating object.

[0039] In this embodiment, the method is implemented by a nondestructive testing system for vibrating objects based on electromagnetic waves, by transmitting electromagnetic waves to the vibrating object, collecting electromagnetic wave echo signals to obtain the vibration amplitude and vibration frequency of the vibrating object, and realizing nondestructive testing of the vibrating object. Among them, the frequency emitted by the electromagnetic wave transceiver is the electromagnetic wave band, and the complex form of the electromagnetic wave echo signal is z=a+bi, z can represent the amplitude and phase information of the electric field or magnetic field, a can represent the real part related to the amplitude, b can represent the imaginary part related to the phase, and i can represent the imaginary unit.

[0040] In one embodiment of the present application, electromagnetic waves of various frequency bands such as microwaves, millimeter waves, and terahertz waves may be selected according to actual conditions.

[0041] Specifically, the sampling parameters of the electromagnetic wave transceiver set by the user are obtained, and the vibrating object is controlled to be in an uninterrupted vibration state. The electromagnetic wave transceiver is controlled to transmit electromagnetic waves to the surface of the vibrating object, and the electromagnetic waves propagate to the surface of the vibrating object and are reflected. The electromagnetic wave transceiver is controlled to receive the electromagnetic wave echo signal. The phase information of the electromagnetic wave echo signal can accurately represent the slight distance change between the vibrating object and the electromagnetic wave transceiver. The host computer is controlled to perform time domain analysis on the electromagnetic wave echo signal to obtain the time domain characteristics of the vibrating object, including the vibration amplitude information. The host computer is controlled to perform frequency domain analysis on the electromagnetic wave echo signal, and the frequency domain characteristics of the vibrating object, including the vibration frequency information, are obtained through Fourier transform. Since the vibration amplitude and vibration frequency of a damaged vibrating object will change to a certain extent compared with an undamaged vibrating object, the damage of the vibrating object can be identified by the change of the vibration amplitude and vibration frequency, so as to realize non-destructive detection of the vibrating object.

[0042] In the embodiment of the present application, the vibration amplitude information and vibration frequency information of the vibrating object are obtained by emitting electromagnetic waves to the vibrating object and collecting echo data. By judging the abnormal vibration amplitude and vibration frequency, it is determined whether the vibrating object is damaged, thereby realizing nondestructive testing. The present application can penetrate into the internal environment of the object being tested, and can realize efficient detection without damaging the object being tested. In addition, the present application does not require expensive ultrasonic detection equipment such as microphone array detection, optical fiber detection, laser detection, and highly radioactive X-ray photography equipment. It has low requirements on the shape of the object being tested and the grain size of the defect position, and has low cost. In addition, the method is suitable for nondestructive testing of vibrating objects with unknown vibration amplitude and vibration frequency.

[0043] In one embodiment of the present application, the method further includes: controlling the host computer to display the vibration amplitude and vibration frequency.

[0044] In this embodiment, the host computer has a visual interface, and the vibration amplitude and vibration frequency of the vibrating object can be displayed in the visual interface, so that the user can intuitively understand the vibration amplitude and vibration frequency of the vibrating object. In addition, when the vibrating object is judged to be damaged, the visual interface can also display information that the vibrating object is damaged, so that the user can timely understand the status of the vibrating object.

[0045] In one embodiment of the present application, the sampling parameter includes a sampling frequency, and obtaining the sampling frequency of the electromagnetic wave transceiver device includes:

[0046] Obtain the number of sampling points and intermediate frequency bandwidth of the electromagnetic wave transceiver;

[0047] Determine the scanning time according to the number of sampling points and the intermediate frequency bandwidth;

[0048] According to the number of sampling points and the scanning time, the sampling frequency of the electromagnetic wave transceiver is calculated according to the sampling frequency calculation formula, and the calculated sampling frequency satisfies Shannon's sampling theorem;

[0049] The sampling frequency calculation formula is:

[0050]

[0051] Among them, f s is the sampling frequency, n is the number of sampling points, and t is the scanning time.

[0052] In this embodiment, the sampling parameters include a sampling frequency, and the method of obtaining the sampling frequency of the electromagnetic wave transceiver device includes:

[0053] (1) Obtain the number of sampling points n and the intermediate frequency bandwidth m set by the user, and calculate the scanning time t based on the number of sampling points n and the intermediate frequency bandwidth m.

[0054] (2) According to the number of sampling points n and the scanning time t, the sampling frequency of the electromagnetic wave transceiver is calculated according to the sampling frequency calculation formula.

[0055] The sampling frequency calculation formula is:

[0056]

[0057] Among them, f s is the sampling frequency, n is the number of sampling points, and t is the scanning time.

[0058] (3) Determine whether the calculated sampling frequency satisfies Shannon's sampling theorem. If so, the sampling parameters of the electromagnetic wave transceiver device are set. That is, the sampling frequency will be used to control the electromagnetic wave transceiver device in the future. If not, return to (1) and reset.

[0059] In one embodiment of the present application, the sampling frequency satisfies Shannon's sampling theorem, which includes the sampling frequency being greater than or equal to twice the vibration frequency of the vibrating object.

[0060] The formula for Shannon's sampling theorem is:

[0061]

[0062] Among them, f s,min Yes s The lowest frequency, B is the bandwidth of the measured electromagnetic wave echo signal (i.e. vibration signal), f max It is the highest frequency in the measured electromagnetic wave echo signal. For a single-frequency vibration signal, it is a signal with a spectrum near the center vibration frequency. M is The decimal part of the result, N is The integer part of the result. M / N can be considered to be approximately 0 and ignored. The bandwidth B of the electromagnetic wave echo signal is relative to the highest frequency f in the electromagnetic wave echo signal. max is very small, N is very large, and M<1, so it is considered that the sampling frequency should be no less than twice the highest frequency contained in the electromagnetic wave echo signal.

[0063] In one embodiment of the present application, the sampling parameters include a sampling time, and the sampling time is 1.5 times of the scanning time.

[0064] In this embodiment, the sampling parameters include a sampling time, and the electromagnetic wave transceiver is controlled to collect the reflected electromagnetic wave echo signal according to the sampling time. When controlling the electromagnetic wave transceiver to collect data, considering the communication delay and the error in the device, the sampling time needs to be greater than the scanning time of the determined electromagnetic wave transceiver, and the sampling time can be set to 1.5 times the scanning time.

[0065] In one embodiment of the present application, judging whether the vibrating object is damaged based on the vibration amplitude includes: if the error between the vibration amplitude and the preset vibration amplitude is greater than a first preset threshold, determining that the vibrating object is damaged, the preset vibration amplitude is the vibration amplitude of an undamaged vibrating object.

[0066] In this embodiment, it is determined whether the error between the vibration amplitude of the currently detected vibrating object and the preset vibration amplitude is greater than a first preset threshold value, wherein the preset vibration amplitude is the vibration amplitude of an undamaged vibrating object, which may be a given vibration amplitude. When the error between the vibration amplitude of the currently detected vibrating object and the preset vibration amplitude is greater than the first preset threshold value, for example, the error exceeds 1%, it is determined that the currently detected vibrating object is damaged.

[0067] In one embodiment of the present application, judging whether a vibrating object is damaged is performed based on the vibration frequency, including: if the error between the vibration frequency and the preset vibration frequency is greater than a second preset threshold, determining that the vibrating object is damaged, the preset vibration frequency is the vibration frequency of an undamaged vibrating object.

[0068] In this embodiment, it is determined whether the error between the vibration frequency of the currently detected vibrating object and the preset vibration frequency is greater than a second preset threshold value, wherein the preset vibration frequency is the vibration frequency of an undamaged vibrating object, which can be a given vibration frequency, such as 300 Hz. When the error between the vibration frequency of the currently detected vibrating object and the preset vibration frequency is greater than the first preset threshold value, for example, the error exceeds 1%, it is determined that the currently detected vibrating object is damaged.

[0069] Exemplarily, with the scanning time t as the horizontal axis and the electromagnetic wave echo signal z as the vertical axis, the time domain information of the vibration signal of n sampling points can be obtained.

[0070] As shown in Figure 4(a) and Figure 4(b), the time domain images obtained after two identical vibrating objects (one intact and one damaged) are tested using the detection method described in the article when the number of sampling points n is 1601 and the intermediate frequency bandwidth m is 2000Hz. Figure 4(a) is an intact vibrating object and Figure 4(b) is a damaged vibrating object. By comparing the vibration amplitude information of the vibrating objects, it can be clearly found that the vibration amplitude of the damaged vibrating object has been seriously amplified. Therefore, this detection method can be used to determine whether the vibrating object is damaged, thereby achieving non-destructive testing.

[0071] By performing Fourier transform on the electromagnetic wave echo signals of the two vibrating objects, the vibration frequencies of the two vibrating objects can be obtained, as shown in Figure 5(a) and Figure 5(b). Figure 5(a) is an intact vibrating object, and Figure 5(b) is a damaged vibrating object. The frequency domain information of the electromagnetic wave echo signal may include the component composition of the frequency and the amplitude of each frequency component. By comparing the vibration frequency information of the two vibrating objects, it can be clearly found that the damaged vibrating object has undergone a large change in vibration frequency and has produced a more obvious resonant frequency. Therefore, this detection method can be used to determine whether the vibrating object is damaged, thereby achieving non-destructive detection.

[0072] As a refinement and extension of the above embodiment, the embodiment of the present invention provides another non-destructive detection method of a vibrating object based on electromagnetic waves, such as Figure 3 As shown, the method includes:

[0073] Step 1: System construction: Build the electromagnetic wave transceiver so that it can continuously and stably transmit electromagnetic waves.

[0074] Step 2: Install a gain antenna to test the effect. Install a gain antenna to focus the electromagnetic waves emitted by the electromagnetic wave transceiver on the vibrating object. Install a gain antenna at a fixed position, obtain the electromagnetic wave power measured before and after the gain antenna is installed, and observe the effect of the gain antenna through the measured electromagnetic wave power.

[0075] Step 3, setting the sampling parameters of the electromagnetic wave transceiver device so that the sampling frequency of the electromagnetic wave transceiver device meets the requirement of not less than twice the vibration frequency of the vibrating object being measured. If not, reset it.

[0076] Step 4: Data collection: Control the electromagnetic wave transceiver to transmit electromagnetic waves and collect the reflected electromagnetic wave echo signals.

[0077] Step 5, obtaining the vibration amplitude of the vibrating object by time domain analysis of the electromagnetic wave echo signal, and obtaining the vibration frequency of the vibrating object by performing Fourier transform on the electromagnetic wave echo signal.

[0078] Step 6: Determine whether the vibrating object is damaged based on the vibration amplitude and vibration frequency.

[0079] The embodiment of the present application provides a nondestructive testing solution for vibrating objects based on electromagnetic waves, which uses the high resolution of electromagnetic waves to quickly achieve nondestructive testing of vibrating objects. The method is simple and efficient, has no ionizing radiation, is safe and reliable, and can be applied to a variety of scenarios.

[0080] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0081] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A nondestructive testing system for vibrating objects based on electromagnetic waves, characterized in that: include: An electromagnetic wave transceiver, a booster antenna, a vibrating object and a host computer, wherein the host computer, the electromagnetic wave transceiver and the booster antenna are connected in sequence, and an opening of the booster antenna faces the vibrating object; Among them, the electromagnetic waves emitted by the electromagnetic wave transceiver are concentrated by the gain antenna and then irradiated onto the surface of the vibrating object. The electromagnetic wave transceiver receives the electromagnetic wave echo signal reflected by the vibrating object and sends it to the host computer; the host computer performs time domain analysis and frequency domain analysis on the electromagnetic wave echo signal to respectively obtain the vibration amplitude and vibration frequency of the vibrating object, and determines whether the vibrating object is damaged based on the vibration amplitude and the vibration frequency, thereby realizing non-destructive detection of the vibrating object.

2. The system according to claim 1, characterized in that The electromagnetic wave transceiver device comprises an electromagnetic wave transceiver, a spectrum expansion module and a frequency extender which are connected in sequence, and the waveguide output port of the frequency extender is connected to the gain antenna.

3. A nondestructive testing method for vibrating objects based on electromagnetic waves, characterized in that: Applied to the nondestructive testing system for vibrating objects based on electromagnetic waves as claimed in claim 1 or 2, the method comprises: Obtaining sampling parameters of the electromagnetic wave transceiver device; Controlling the vibrating object to be in an uninterrupted vibrating state; Controlling the electromagnetic wave transceiver to transmit electromagnetic waves to the surface of the vibrating object, so that the vibrating object reflects the electromagnetic waves; Controlling the electromagnetic wave transceiver to collect the reflected electromagnetic wave echo signal according to the sampling parameters; The host computer is controlled to perform time domain analysis and frequency domain analysis on the electromagnetic wave echo signal to obtain the vibration amplitude and vibration frequency of the vibrating object respectively, and whether the vibrating object is damaged is judged according to the vibration amplitude and the vibration frequency to achieve nondestructive detection of the vibrating object.

4. The method according to claim 3, characterized in that The method further comprises: The host computer is controlled to display the vibration amplitude and the vibration frequency.

5. The method according to claim 3, characterized in that: The sampling parameters include a sampling frequency, and obtaining the sampling frequency of the electromagnetic wave transceiver device includes: Obtaining the number of sampling points and intermediate frequency bandwidth of the electromagnetic wave transceiver; Determining the scanning time according to the number of sampling points and the intermediate frequency bandwidth; The sampling frequency of the electromagnetic wave transceiver is calculated according to the number of sampling points and the scanning time and in accordance with a sampling frequency calculation formula, and the calculated sampling frequency satisfies Shannon's sampling theorem; The sampling frequency calculation formula is: Among them, f s is the sampling frequency, n is the number of sampling points, and t is the scanning time.

6. The method according to claim 5, characterized in that The sampling frequency satisfies Shannon's sampling theorem, including that the sampling frequency is greater than or equal to twice the vibration frequency of the vibrating object.

7. The method according to claim 5, characterized in that The sampling parameters include a sampling time, and the sampling time is 1.5 times of the scanning time.

8. The method according to claim 3, characterized in that Judging whether the vibrating object is damaged according to the vibration amplitude includes: If the error between the vibration amplitude and a preset vibration amplitude is greater than a first preset threshold, it is determined that the vibrating object is damaged, and the preset vibration amplitude is the vibration amplitude of an undamaged vibrating object.

9. The method according to claim 3, characterized in that: Judging whether the vibrating object is damaged according to the vibration frequency includes: If the error between the vibration frequency and the preset vibration frequency is greater than a second preset threshold, it is determined that the vibrating object is damaged, and the preset vibration frequency is the vibration frequency of an undamaged vibrating object.

10. The method according to any one of claims 3 to 9, characterized in that The electromagnetic wave includes any one of the following: microwave, millimeter wave, terahertz wave.

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