Method, equipment and system for nondestructive testing of building curtain wall perspective imaging

Abstract

The present disclosure relates to a method, device and system for nondestructive testing of building curtain wall perspective imaging, the method comprising: determining the frequency range of microwaves emitted to the part to be detected; according to the frequency range, controlling the microwave transmitting antenna to emit microwaves to the part to be detected, so as to perform microwave imaging detection on the part to be detected; wherein the frequency range of the microwaves is determined according to a two-dimensional relationship curve between the dielectric loss tangent value of each material and the microwave frequency band, so as to reduce microwave loss. The method of the present application detects curtain walls by microwave imaging, which can improve the accuracy of curtain wall detection, and reduces microwave loss by selecting and determining the microwave frequency, which helps to improve the clarity of microwave imaging.

Description

Technical Field

[0001] The present disclosure relates to the technical field of curtain wall detection, and in particular to a method, device and system for perspective imaging nondestructive detection of building curtain walls. Background Art

[0002] The building curtain wall is the external protective structure and decorative structure of the building. Behind the curtain wall are load-bearing hangers and keels. If the hangers are not installed enough or missed during construction, the risk of the curtain wall falling off increases. In related technologies, the inspection of building curtain walls is mainly carried out through destructive sampling, which evaluates the service condition of the overall building curtain wall locally. It is highly destructive and has low accuracy. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a method, device and system for nondestructive testing of building curtain walls by perspective imaging.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for nondestructive testing of building curtain walls by perspective imaging is provided, comprising:

[0005] Determine the frequency range of microwaves emitted to the object to be detected;

[0006] According to the frequency range, controlling the microwave transmitting antenna to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected;

[0007] The frequency range of the microwave is determined based on a two-dimensional relationship curve between the dielectric loss tangent value of each material and the microwave frequency band, so as to reduce microwave loss.

[0008] In one embodiment, the frequency range of the microwaves is a frequency range covering a plurality of minimum value points in a plurality of two-dimensional relationship curves between dielectric loss tangent values ​​and microwave frequency bands.

[0009] In one embodiment, the frequency range of the microwaves is 20-50 GHz.

[0010] In one embodiment, the frequency range of the microwaves is between 28 GHz and 35 GHz.

[0011] In one embodiment, it further includes:

[0012] Obtaining the thickness of the piece to be tested;

[0013] Determining the microwave power corresponding to the thickness according to the thickness and a preset correspondence between thickness and power;

[0014] According to the frequency range, controlling the microwave transceiver antenna to transmit microwaves to the object to be detected so as to perform microwave imaging detection on the object to be detected includes:

[0015] According to the frequency range and the microwave power, the microwave transceiver antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

[0016] In the second aspect, the present application proposes a non-destructive testing method for building curtain wall perspective imaging, comprising:

[0017] Obtain the material properties of the curtain wall to be tested;

[0018] If the material of the curtain wall to be inspected is stone, one or more target extreme value points are determined according to the two-dimensional correspondence between the frequency of the material and the dielectric loss tangent value; wherein the dielectric loss tangent value of each target extreme value point is the smallest;

[0019] The frequency corresponding to each target extreme point is used as the frequency of the microwave emitted to the detected curtain wall.

[0020] In one embodiment, if the material of the curtain wall to be inspected is metal or glass, a predetermined microwave frequency band is determined; microwaves are emitted to the curtain wall to be inspected at the predetermined microwave frequency band to perform microwave imaging detection; the predetermined microwave frequency band is 77-81 GHz.

[0021] According to a third aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the executable instructions to implement the steps of the above method.

[0022] According to a fourth aspect of an embodiment of the present disclosure, there is provided a non-temporary computer-readable storage medium on which computer program instructions are stored, and the program instructions implement the steps of the above method when executed by a processor.

[0023] According to a fifth aspect of the disclosed embodiment, the present application proposes a building curtain wall perspective imaging nondestructive testing system, comprising: a mechanical hoisting device, a perspective imaging device, the perspective imaging device being used to determine the frequency range of microwaves emitted to the part to be tested;

[0024] According to the frequency range, the microwave transmitting antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

[0025] In one embodiment, it further comprises: a reverse thrust fan, which is arranged at the rear end of the perspective imaging device and is used to apply thrust to the perspective imaging device after being started, so that the perspective imaging device is closely attached to the curtain wall to be measured;

[0026] A support rod is arranged at the front end of the perspective imaging device. When working, one end of the support rod supports the curtain wall to be measured, so that the perspective imaging device maintains a fixed distance from the curtain wall to be measured.

[0027] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the method of the present application detects curtain walls through a microwave imaging method, which can improve the accuracy of curtain wall detection, and reduces microwave loss by selecting and determining the microwave frequency, which helps to improve the clarity of microwave imaging.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] Figure 1 It is a flow chart of a method for nondestructive testing of building curtain wall perspective imaging according to an exemplary embodiment;

[0031] Figure 2 is a two-dimensional relationship curve diagram of dielectric loss tangent values ​​of various materials and microwave frequency bands according to an exemplary embodiment;

[0032] Figure 3 is a flow chart of another method for nondestructive testing of building curtain walls by perspective imaging according to an exemplary embodiment;

[0033] Figure 4 is a schematic diagram of microwave imaging according to an exemplary embodiment;

[0034] Figure 5 is a schematic diagram of microwave imaging according to an exemplary embodiment;

[0035] Figure 6 is a schematic diagram of microwave imaging after increasing power according to an exemplary embodiment;

[0036] Figure 7 is a schematic diagram of microwave imaging after increasing power according to an exemplary embodiment;

[0037] Figure 8 is a block diagram of a building curtain wall perspective imaging nondestructive testing device according to an exemplary embodiment;

[0038] Fig. 9 is a block diagram of another nondestructive testing device for building curtain wall perspective imaging according to an exemplary embodiment;

[0039] Fig.10 is a block diagram of an electronic device according to an exemplary embodiment;

[0040] Fig.11 is a schematic diagram of a building curtain wall perspective imaging nondestructive testing system according to an exemplary embodiment;

[0041] Fig.12 is a block diagram of a building curtain wall perspective imaging nondestructive testing system according to an exemplary embodiment;

[0042] Fig.13 is a schematic diagram showing a replacement detection position according to an exemplary embodiment;

[0043] Fig.14 is a schematic diagram showing another method of replacing a detection position according to an exemplary embodiment;

[0044] Fig.15 The diagram is a schematic diagram showing a method of adjusting an antenna working range according to an exemplary embodiment. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0046] It should be noted that all actions of acquiring signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

[0047] A nondestructive testing method for building curtain wall perspective imaging, see attached Figure 1 The flowchart of a method for nondestructive testing of building curtain wall perspective imaging is shown, and the method comprises the following steps:

[0048] In step S102, the frequency range of the microwaves emitted to the object to be inspected is determined.

[0049] In some embodiments, the frequency range of microwaves can be determined in advance, and a frequency range can be pre-set for the microwave imaging device. When curtain wall detection is performed on various target buildings, the frequency range can be used for detection.

[0050] In step S104, according to the frequency range, the microwave transmitting antenna is controlled to transmit microwaves to the object to be inspected, so as to perform microwave imaging inspection on the object to be inspected.

[0051] In some embodiments, a microwave imaging device is used, and a microwave transmitting antenna, a receiving antenna, and a controller are provided on the microwave imaging device for receiving external control commands and controlling the microwave transceiver antenna to transmit microwaves, receive microwaves, and control the power change of microwaves.

[0052] The frequency range of the microwave is determined based on a two-dimensional relationship curve between the dielectric loss tangent value of each material and the microwave frequency band, so as to reduce microwave loss.

[0053] See attached Figure 2 The two-dimensional relationship diagram of dielectric loss tangent value and microwave frequency band of a material is shown. The dielectric loss tangent value and microwave frequency band of each material are two-dimensional curves. One principle for determining the frequency range of microwaves based on the two-dimensional curve is to make the corresponding dielectric loss tangent value as small as possible, and the ultimate goal is to reduce the loss of microwaves.

[0054] In some embodiments, the frequency range of the microwaves is a frequency range covering a plurality of minimum value points in a plurality of two-dimensional relationship curves between dielectric loss tangent values ​​and microwave frequency bands.

[0055] See attached Figure 2 , showing the two-dimensional relationship curves between the dielectric loss tangent value and the microwave frequency band of various materials. In each curve, as the microwave frequency increases, the dielectric loss tangent value will change in size, and there will be one or more minimum points.

[0056] In one embodiment, when the material of the above-mentioned part to be detected is stone, the frequency range of the microwave is 20-50 GHz. Within the above-mentioned range, a large number of minimum points appear. Specifically, a large number of minimum points are densely distributed in the range of 26-30 GHz and in the range of 33-37 GHz.

[0057] In some embodiments, the frequency range of the microwave is 28 GHz and 35 GHz. As can be seen from the figure, a large number of minimum points are densely distributed near 28 GHz and 35 GHz. Therefore, these two frequencies can be used as the center frequency of the microwave imaging device. Therefore, when inspecting various curtain walls, using this center frequency can cope with most inspections, achieve the effect of reducing microwave loss, and help improve the clarity of microwave imaging results.

[0058] In one embodiment, the following steps are also included:

[0059] Obtaining the thickness of the piece to be tested;

[0060] Specifically, the thickness of the object to be detected can be input into the microwave imaging device in advance; for example, the thickness is 25 mm, or 30 mm;

[0061] Determining the microwave power corresponding to the thickness according to the thickness and a preset correspondence between thickness and power;

[0062] Specifically, the corresponding relationship between thickness and power can be detected in advance. In theory, the greater the power, the greater the depth that can be detected. Therefore, the greater the thickness of the object to be detected, the greater the microwave power required to penetrate the object to be detected. The corresponding relationship between the thickness of the object to be detected and the microwave power can be set. The corresponding microwave power is selected according to the thickness of the object to be detected.

[0063] According to the predetermined microwave frequency range, controlling the microwave transceiver antenna to transmit microwaves to the object to be detected so as to perform microwave imaging detection on the object to be detected includes:

[0064] According to the predetermined microwave frequency range and the microwave power, the microwave transceiver antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

[0065] After the frequency and power of the microwave imaging equipment are set, it operates at the set frequency and power to emit microwaves to the object to be inspected.

[0066] In the second aspect, the present application also proposes a non-destructive testing method for building curtain wall perspective imaging, see Attachment Figure 3 , the method comprises the following steps:

[0067] Step S302, obtaining material properties of the curtain wall to be detected;

[0068] In some embodiments, the user may input the material properties of the curtain wall to be detected in advance in the microwave imaging device. The microwave imaging device may be provided with a human-computer interaction interface, through which the material properties are input. Alternatively, the material properties may be input in the control terminal through the control terminal, and the control terminal sends the material properties to the microwave imaging device. The control terminal may be a mobile terminal, or an electronic device such as a desktop computer or a laptop computer.

[0069] Among them, the material is granite.

[0070] Step S304: If the material of the curtain wall to be inspected is stone, one or more target extreme value points are determined according to the two-dimensional correspondence between the frequency of the material and the dielectric loss tangent value; wherein the dielectric loss tangent value of each target extreme value point is the smallest, specifically, within the local frequency range, it has the smallest loss tangent value.

[0071] Exemplarily, the microwave imaging device pre-stores the two-dimensional correspondence between the frequency and the dielectric loss tangent value of various materials. According to the two-dimensional correspondence between the frequency and the dielectric loss tangent value of granite, a target extreme point can be determined.

[0072] Step S306: Using the frequency corresponding to each target extreme point as the frequency of the microwave emitted to the detected curtain wall.

[0073] Exemplarily, the frequency of the target extreme point of granite is 28.16 GHz, so the frequency of the microwaves emitted by the microwave imaging device is 28.16 GHz.

[0074] Microwaves are sent to the curtain wall to be inspected at the determined frequency to perform microwave imaging inspection on the curtain wall to be inspected.

[0075] In the above method of the present application, the microwave imaging device can determine the corresponding microwave frequency according to the material properties of the curtain wall to be detected, thereby reducing the loss of microwave imaging and helping to improve the clarity of the microwave imaging detection results, thereby facilitating users to make more accurate result judgments.

[0076] In one embodiment, if the material of the curtain wall to be inspected is metal or glass, a predetermined microwave frequency band is determined; microwaves are emitted to the curtain wall to be inspected at the predetermined microwave frequency band to perform microwave imaging detection; the predetermined microwave frequency band is 77-81 GHz.

[0077] If the material of the curtain wall to be inspected is glass curtain wall or aluminum plate, the microwave frequency range can be determined to be 77-81GHz. Because within this frequency range, the microwave imaging results can clearly distinguish each connector, such as the presence, position, size and other effective information of the curtain wall pressure block, support plate, connecting screws and other connectors, further enriching the information content of the imaging analysis.

[0078] The back of the object being tested is fixed to a metal keel. Figure 4 , 5 This is a microwave imaging result. Figure 6 , 7 The microwave imaging results obtained after increasing the power. As can be seen from the figure, in a result image at a distance of 0.59333m, the metal keel on the back can be clearly shown.

[0079] In one embodiment, the following steps are also included:

[0080] Obtaining the thickness of the piece to be tested;

[0081] Determining the microwave power corresponding to the thickness according to the thickness and a preset correspondence between thickness and power;

[0082] According to the predetermined microwave frequency range and the microwave power, the microwave transceiver antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

[0083] After the frequency and power of the microwave imaging equipment are set, it operates at the set frequency and power to emit microwaves to the object to be inspected.

[0084] In the third aspect, the present application proposes a nondestructive testing device for building curtain wall perspective imaging, see the attached Figure 8 , the device comprises:

[0085] A first determination module 91 is used to determine the frequency range of the microwaves emitted to the detected curtain wall;

[0086] A first control module 92 is used to control the microwave transmitting antenna to transmit microwaves to the object to be detected according to the frequency range, so as to perform microwave imaging detection on the object to be detected;

[0087] The frequency range of the microwave is determined based on a two-dimensional relationship curve between the dielectric loss tangent value of each material and the microwave frequency band, so as to reduce microwave loss.

[0088] In one embodiment, it further includes: an acquisition module, used to acquire the thickness of the piece to be detected;

[0089] A power determination module, used for determining the microwave power corresponding to the thickness according to the thickness and a preset correspondence relationship between thickness and power;

[0090] The first control module 92 is further used to control the microwave transceiver antenna to transmit microwaves to the object to be detected according to the frequency range and the microwave power, so as to perform microwave imaging detection on the object to be detected.

[0091] In the fourth aspect, the present application proposes a nondestructive testing device for building curtain wall perspective imaging, see the attached Fig. 9 , the device comprises:

[0092] The first acquisition module 1001 is used to acquire the material properties of the curtain wall to be detected;

[0093] The second determination module 1002 is used to determine one or more target extreme value points according to the two-dimensional correspondence between the frequency and the dielectric loss tangent value of the material; wherein the dielectric loss tangent value of each target extreme value point is the smallest;

[0094] Determine the frequency corresponding to each target extreme value point;

[0095] The second control module 1003 is used to control the microwave transmitting antenna to transmit microwaves to the object to be detected according to the frequency, so as to perform microwave imaging detection on the object to be detected.

[0096] In one embodiment, it further includes:

[0097] A second acquisition module is used to acquire the thickness of the piece to be detected;

[0098] A third determination module, used to determine the microwave power corresponding to the thickness according to the thickness and a preset correspondence relationship between thickness and power;

[0099] The second control module 1003 is further used to control the microwave transceiver antenna to transmit microwaves to the object to be detected according to the frequency range and the microwave power, so as to perform microwave imaging detection on the object to be detected.

[0100] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0101] In a fifth aspect, the present application proposes an electronic device, see the attached Fig.10 , including at least one processor 1101 and at least one memory 1102; the memory 1102 is used to store one or more program instructions; the processor 1101 is used to run one or more program instructions to execute any of the above methods.

[0102] In a fourth aspect, the present application further proposes a computer-readable storage medium, which contains one or more program instructions, and the one or more program instructions are used to execute any of the methods described above.

[0103] In a sixth aspect, the present application proposes a building curtain wall perspective imaging nondestructive testing system, see the attached Fig.11 The system includes: a mechanical hoisting device 1201, a perspective imaging device 1202, and the perspective imaging device 1202 is used to determine the frequency range of microwaves emitted to the detected curtain wall;

[0104] According to the frequency range, the microwave transmitting antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

[0105] In one embodiment, it further includes: a reverse thrust fan 1203, which is disposed at the rear end of the perspective imaging device and is used to apply thrust to the perspective imaging device after being started, so that the perspective imaging device is closely attached to the curtain wall to be measured;

[0106] A support rod 1204 is provided at the front end of the perspective imaging device. When working, a roller 1205 is provided at one end of the support rod 1204, and the roller contacts the curtain wall to be measured, so that the perspective imaging device maintains a fixed distance from the curtain wall to be measured.

[0107] In some embodiments, see Fig.12 The perspective imaging device 1202 may further include:

[0108] Central control unit 12021, the central control unit 12021 is equivalent to the above-mentioned electronic device.

[0109] Steps for performing any of the methods described above.

[0110] The transceiver module 12022 includes: a first switch and a receiving linear array connected to each other; a second switch and a transmitting linear array connected to each other;

[0111] Data storage module 12023, used for storing data;

[0112] The data acquisition module 12024 is used to collect echo data and data stored in the data storage module 12023;

[0113] The signal processing module 12025 is used to process the received microwaves to obtain microwave imaging results;

[0114] Synchronous clock module 12026, used to provide clock for the central control unit;

[0115] The heat dissipation module 12027 is used to dissipate heat for the central control unit;

[0116] It also includes a communication module 12028 for communicating with an external control terminal 12029.

[0117] The inertial navigation and encoder 12030 is used to collect device position and attitude information for the above-mentioned central control unit 12021.

[0118] The following is a specific example to illustrate the specific control process. This example takes a 1000×600mm stone plate as an example. The center frequency band of the imaging system is 28GHz, and the power is adjustable from 0 to 1w:

[0119] The method comprises the following steps:

[0120] (1) Arrange the mechanical scanning frame carrying the imaging system parallel to the existing building curtain wall to be inspected. Under the action of the central control unit, switch and synchronous clock module, the imaging line array is scanned in a planar manner by one-dimensional electrical scanning and one-dimensional mechanical scanning;

[0121] (2) During the scanning process, the transmitting linear array transmits microwave signals, and the receiving linear array receives echo signals after penetrating the panel and being reflected by the detection target. The data acquisition module collects the phase and amplitude of the relevant echo signals;

[0122] (3) The signal processing module pre-processes the echo signal, arranges it in a certain way, and transmits it to the host computer through the wireless transmission module (or network transmission module, depending on the transmission conditions of the two signals);

[0123] (4) The data storage module temporarily stores the pre-processed signals, and the heat dissipation module ensures that the imaging system continues to work stably;

[0124] (5) The inertial navigation system and encoder record the position and attitude information of the imaging system and accurately return the position information corresponding to the collected signal;

[0125] (6) Repeat the above steps until the safety scan of the entire curtain wall is completed.

[0126] In this embodiment, a reverse thrust fan is used to provide thrust close to the building curtain wall, a support rod with rollers maintains a constant detection distance, and a hoisting device carries the transceiver array to move in the vertical direction at a constant speed, such as about 0.2-1.0m / s.

[0127] During this period, under the action of the central control unit, switch and synchronous clock module, the transmitting antenna transmits electromagnetic waves of the central frequency band (28GHz for stone curtain wall and 77GHz for glass curtain wall), which penetrate the surface material and are reflected by the invisible load-bearing structures such as keels, hangers, connecting bolts, and pressure blocks, and then return to the receiving antenna with relevant information. The receiving antenna receives the echo signal containing phase and amplitude information. Since metals almost completely reflect electromagnetic waves, and materials such as stone, glue, and rock wool have good permeability to electromagnetic waves, the amplitude and phase of the echo signal vary greatly with or without metal keels and hangers, and are recorded by the data acquisition module and processed and transmitted through subsequent steps. The above completes the horizontal electrical scanning in a very short time, and realizes the vertical mechanical scanning with the vertical movement of the linear array antenna, and jointly realizes the strip detection with a vertical width of 1000mm.

[0128] Step (3) pre-processes the echo signals collected by the data acquisition module in step (2) and arranges them according to a certain rule, so as to make the data more in line with the requirements of image processing while confirming the integrity of the scan; after the pre-processing is completed, the data is uploaded to the host computer through the wireless transmission module or the 4G network transmission solution.

[0129] Step (4) In addition to uploading the data to the host computer in real time during the system operation, in order to ensure data integrity and backup, the data is temporarily stored in the data storage module during the process and named after the acquisition location, such as: the first curtain wall panel from left to right on the east facade. The heat dissipation module is turned on during the entire operation process to ensure that the heat is dissipated in a timely and effective manner to avoid local overheating of the imaging system, resulting in abnormal operation or data loss.

[0130] Step (5) The inertial navigation and encoder record the position of the imaging system when collecting data, taking the upper right corner of each facade as the starting zero point, establishing the x-axis and y-axis horizontally and vertically respectively, clarifying the posture and position information of the imaging system during the period, and providing positioning information for the image after imaging processing, so that when defects are found, the spatial position can be accurately found, which is convenient for maintenance and replacement.

[0131] At this point, the inspection of the entire curtain wall is completed. In step (6), the inspection position is changed to complete the inspection of the entire facade and the entire building facade in turn. Fig.13 As shown, the fluoroscopic imaging device can be retracted to the top floor and replaced when the top floor sling is shortest. Fig.14 As shown, after completing the single-row inspection, a Z-shaped inspection is performed at the current position, and the horizontal displacement distance is 1000mm (depending on the width of the specific inspection project plate). It is worth noting that when performing a Z-shaped inspection, when changing the inspection position on the ground, personnel assistance is required to ensure that the imaging system works stably and vertically to avoid position deviation during movement and missed inspections.

[0132] In some embodiments, the central control unit 12021 is also used to obtain the width of a single panel of the target to be detected. If the width of the single panel of the target to be detected is smaller than the width of the antenna in the transceiver module 12022, the working range and stepping distance of the antenna array are determined according to the width of the single panel of the target to be detected so that the antenna is suitable for the panel to be detected.

[0133] For example, the width of the antenna array can be set to 1.44m. The width of the panel to be detected can be 1200mm or 800mm, which is much smaller than the width of the antenna array. In this case, it is necessary to determine the working range of the antenna array and the step distance.

[0134] Specifically, the step distance can be set equal to the width of the panel to be detected. Based on the width of the panel to be detected, a predetermined redundancy is reserved on the left and right to obtain the working range of the antenna array.

[0135] See also Fig.15 For example, when the width of the panel to be tested is 800 mm, the overlap rate is taken into consideration to make the front 960 mm of the linear array work normally, and the stepping distance is selected to be 800 mm in the left and right movement, wherein the stepping distance is equal to the width of the above-mentioned panel to be tested. As shown in the figure, it represents the normal working linear array width and position when the width of the panel to be tested is 800, 900 and 1000 mm, respectively, wherein the color is the working width.

[0136] When the width of the panel to be measured is 900 mm, the width of the working range of the antenna array is 1080 mm, and the step distance is 900 mm.

[0137] When the width of the panel to be measured is 1000 mm, the width of the working range of the antenna array is 1200 mm, and the step distance is 1000 mm.

[0138] In this way, using a large-size antenna can reduce the workload of splicing; by adjusting the working range and step length, the detection range is clearer, the interference of irrelevant areas is reduced, the detection results are purer, and the defect assessment is more accurate.

[0139] Compared with the prior art, the advantages of the present invention are: 1. Full inspection of the curtain wall eliminates accidental errors and potential risks as much as possible; 2. Non-destructive inspection does not cause damage to the curtain wall itself, reducing the cost of repair; 3. The inspection method is imaging, and a more recognizable solution is adopted as much as possible to complete the curtain wall safety inspection; 4. Customized products with different frequency bands and powers are designed for curtain walls of different materials and different inspection purposes, which meet the requirements of on-site use; 5. Combined with the actual panel size, the relationship between the line array and the panel size is clarified, which reduces the workload of splicing to a certain extent and makes the inspection results clearer.

[0140] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0141] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for nondestructive testing of building curtain walls by perspective imaging, characterized in that: include: Determine the frequency range of microwaves emitted to the object to be detected; According to the frequency range, controlling the microwave transmitting antenna to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected; Wherein, the frequency range of the microwave is determined according to a two-dimensional relationship curve between the dielectric loss tangent value of each material and the microwave frequency band, so as to reduce microwave loss; The frequency range of the microwaves is a frequency range covering a plurality of dielectric loss tangent value minimum value points in a plurality of two-dimensional relationship curves between dielectric loss tangent values ​​and microwave frequency bands.

2. The building curtain wall perspective imaging nondestructive testing method according to claim 1, characterized in that: The frequency range of the microwave is 20-50 GHz.

3. The building curtain wall perspective imaging nondestructive testing method according to claim 2, characterized in that: The central frequencies of the microwaves are 28 GHz and 35 GHz.

4. The building curtain wall perspective imaging nondestructive testing method according to claim 1, characterized in that: Also includes: Obtaining the thickness of the piece to be tested; Determining the microwave power corresponding to the thickness according to the thickness and a preset correspondence between thickness and power; According to the frequency range, controlling the microwave transceiver antenna to transmit microwaves to the object to be detected so as to perform microwave imaging detection on the object to be detected includes: According to the frequency range and the microwave power, the microwave transceiver antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

5. A nondestructive testing method for stone building curtain wall perspective imaging, characterized in that: include: The material of the curtain wall to be tested is stone, and one or more target extreme value points are determined according to the two-dimensional correspondence between the frequency of the material and the dielectric loss tangent value; wherein the dielectric loss tangent value of each target extreme value point is the smallest; The frequency corresponding to each target extreme point is used as the frequency of the microwave emitted to the detected curtain wall.

6. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to run the executable instructions to implement the building curtain wall perspective imaging nondestructive testing method according to any one of claims 1 to 4 or 5.

7. A building curtain wall perspective imaging nondestructive testing system, characterized in that: The perspective imaging nondestructive testing method for building curtain walls according to any one of claims 1 to 4 or 5 comprises: a mechanical lifting device, a perspective imaging device, wherein the perspective imaging device is used to determine the frequency range of microwaves emitted to the part to be tested; According to the frequency range, the microwave transmitting antenna is controlled to transmit microwaves to the object to be detected, so as to perform microwave imaging detection on the object to be detected.

8. The building curtain wall perspective imaging nondestructive testing system according to claim 7, characterized in that: Also includes: A reverse thrust fan, which is arranged at the rear end of the perspective imaging device and is used to apply thrust to the perspective imaging device after being started, so that the perspective imaging device is closely attached to the curtain wall to be measured; A support rod is arranged at the front end of the perspective imaging device. When working, one end of the support rod supports the curtain wall to be measured, so that the perspective imaging device maintains a fixed distance from the curtain wall to be measured.

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