CN113551760A - Ground vibration signal measuring system, method and device - Google Patents
Ground vibration signal measuring system, method and device Download PDFInfo
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- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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Abstract
The invention discloses a system, a method and a device for measuring ground vibration signals, wherein the system comprises: a plurality of targets, a signal energizer, a camera, and a computing device; the multiple targets are arranged on the ground of the area to be detected, and the reflecting surface of each target is not shielded; the reflecting surface of each target is provided with a preset pattern; the signal exciter is arranged at a first preset position of the ground and used for generating a signal for exciting ground vibration in the area to be tested; the camera is arranged at a second preset position on the ground and is used for acquiring video images of the reflecting surfaces of the targets under the condition that the signal exciter generates a signal for exciting ground vibration in the region to be detected; and the computing equipment is used for determining the ground vibration signal information of the area to be detected according to the video image acquired by the camera. The invention carries out multi-point measurement on the ground in a non-contact mode, and can synchronously extract two-dimensional component vibration for each point, thereby realizing the purpose of simultaneously analyzing the frequency and the amplitude of a ground vibration signal.
Description
Technical Field
The invention relates to the field of ground vibration measurement, in particular to a system, a method and a device for measuring ground vibration signals.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
As is well known, the measurement of ground vibration signals and the analysis of the ground vibration signals play very important roles in applications such as track traffic survey, petroleum geological exploration, precise instrument placement requirements and the like, and the measurement of the ground vibration signals has different characteristics and requirements in different application fields.
At present, in the prior art, the following two methods are mainly adopted to measure the ground vibration signal: one is a contact measurement method (e.g., geophone measurement, fiber grating measurement, etc.); another is a non-contact measurement method (e.g., laser vibration measurement, etc.). The contact type measuring method has the defects of poor anti-interference capability, incapability of realizing broadband measurement (particularly difficult measurement on low-frequency signals) due to the restriction of natural frequency and the like; the non-contact method is generally to collect the vibration signal of a certain point on the ground, and the multi-point or surface measurement cannot be carried out, and the signal collected by the non-contact measurement has amplitude-frequency coupling, and only the signal with larger amplitude can be collected at low frequency.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a ground vibration signal measuring system, which is used for solving the technical problems that the existing ground vibration measuring method has weak anti-interference capability and low precision and cannot realize broadband measurement, and comprises the following steps: a plurality of targets, a signal energizer, a camera, and a computing device; the multiple targets are arranged on the ground of the area to be detected, and the reflecting surface of each target is not shielded; the reflecting surface of each target is provided with a preset pattern; the signal exciter is arranged at a first preset position of the ground and used for generating a signal for exciting ground vibration in the area to be tested; the camera is arranged at a second preset position on the ground and is used for acquiring video images of the reflecting surfaces of the targets under the condition that the signal exciter generates a signal for exciting ground vibration in the region to be detected; and the computing equipment is communicated with the camera and used for determining the ground vibration signal information of the area to be detected according to the video image acquired by the camera.
The embodiment of the invention also provides a ground vibration signal measuring method, which is used for solving the technical problems that the existing ground vibration measuring method has weak anti-interference capability and low precision and cannot realize broadband measurement, and comprises the following steps: the control signal exciter generates a vibration signal for exciting the ground of the area to be tested to vibrate, wherein the ground of the area to be tested is provided with a plurality of targets, the reflecting surface of each target is not shielded, and the reflecting surface of each target is provided with a preset pattern; controlling a camera to acquire video images of the reflecting surfaces of the targets; and determining the ground vibration signal information of the area to be detected according to the video image of each target reflection surface.
The embodiment of the invention also provides a ground vibration signal measuring device, which is used for solving the technical problems that the existing ground vibration measuring method has weak anti-interference capability and low precision and cannot realize broadband measurement, and comprises the following steps: the excitation signal control module is used for controlling the signal exciter to generate a vibration signal for exciting the ground vibration of the area to be tested, wherein the ground of the area to be tested is provided with a plurality of targets, the reflecting surface of each target is not shielded, and the reflecting surface of each target is provided with a preset pattern; the high-speed photography control module is used for controlling the camera to acquire video images of the reflecting surfaces of the targets; and the ground vibration signal analysis module is used for determining the ground vibration signal information of the area to be detected according to the video images of the target reflecting surfaces.
The embodiment of the invention also provides computer equipment for solving the technical problems that the existing ground vibration measuring method is weak in anti-interference capability and low in precision and cannot realize broadband measurement.
The embodiment of the invention also provides a computer readable storage medium, which is used for solving the technical problems that the existing ground vibration measuring method has weak anti-interference capability and low precision and cannot realize broadband measurement.
In the embodiment of the invention, a plurality of non-shielding targets are distributed on the ground of the area to be detected, and under the condition that a vibration signal for exciting the ground vibration of the area to be detected is generated by a signal exciter, the video image of each target reflection surface is collected by a camera, so that the ground vibration signal information of the area to be detected is determined according to the video image of each target reflection surface.
According to the embodiment of the invention, the ground vibration signal can be measured in a non-contact manner at multiple points, the two-dimensional component vibration of each point can be synchronously extracted in real time, the frequency characteristic of the ground vibration signal can be analyzed according to the extraction result, the amplitude characteristic of the ground vibration signal can also be analyzed, and the method has the advantages of strong anti-interference capability, high precision, suitability for wide-frequency-band measurement and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic diagram of a ground vibration signal measurement system provided in an embodiment of the present invention;
FIG. 2a is a schematic illustration of a target using a conical base structure provided in an embodiment of the present invention;
FIG. 2b is a schematic diagram of a target using a planar base according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a process for analyzing a ground vibration signal according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for measuring a ground vibration signal according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a ground vibration signal measuring device provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are used in an open-ended fashion, i.e., to mean including, but not limited to. Reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the embodiments is for illustrative purposes to illustrate the implementation of the present application, and the sequence of steps is not limited and can be adjusted as needed.
The inventor finds that the high-speed photography vibration measurement method can collect vibration of a target by using equipment such as a high-speed camera and the like, and can collect vibration signals of ground multi-point or even two-dimensional area arrays by combining with an optimized computer vision algorithm.
Under the above inventive concept, the embodiment of the present invention provides a ground vibration signal measurement system, which is applicable to, but not limited to, ground multi-point and two-dimensional signal vibration analysis (also applicable to ground single-point and one-dimensional vibration signal analysis applications) in the application fields of track traffic survey, petroleum geological exploration, precise instrument placement requirements, and the like. For example, in the exploration seismic process of the petroleum industry, the earth surface two-dimensional seismic information is provided for the acquisition and application of earth surface seismic signals.
Fig. 1 is a schematic diagram of a ground vibration signal measurement system provided in an embodiment of the present invention, as shown in fig. 1, the system includes: a plurality of targets 10, signal energizers 20, cameras 30 and computing devices 40;
the targets 10 are arranged on the ground of the area to be detected, and the reflecting surface of each target 10 is not shielded; the reflective surface of each target 10 has a predetermined pattern thereon; the signal exciter 20 is arranged at a first preset position of the ground and is used for generating a signal for exciting ground vibration in the region to be tested; the camera 30 is arranged at a second preset position on the ground and is used for acquiring video images of the reflecting surfaces of the targets 10 under the condition that the signal exciter 20 generates a signal for exciting ground vibration in the region to be detected; and the computing equipment 40 is communicated with the camera 30 and is used for determining the ground vibration signal information of the area to be measured according to the video image acquired by the camera 30.
It should be noted that the computing device 40 used in the embodiment of the present invention may be, but is not limited to, a computer, as long as it is a device capable of performing operations or processing on image data, and corresponding software is run on the computing device 40, so as to determine the ground vibration signal information of the area to be measured according to the video image acquired by the camera 30.
In order to make each target distributed on the ground of the region to be measured fall within the field of view of the camera 30, the ground vibration signal measurement system provided in the embodiment of the present invention may further include: and the bracket 50 is arranged at a second preset position on the ground and is used for supporting the camera 30, so that the reflecting surface of each target board 103 is within the field of view of the camera 30.
Further, in order to adjust the angle of the camera 30, the ground vibration signal measurement system provided in the embodiment of the present invention may further include: and a pan-tilt 60 disposed on top of the bracket 50 for mounting the camera 30.
In one embodiment, the support 50 used in embodiments of the present invention may be a tripod on top of which a pan/tilt head is mounted, through which a high speed camera is fixed. In specific implementation, the distance between the camera and the target can be 5-15 meters; the high speed of the camera is adjusted so that the optical axis of the camera is perpendicular to the reflective surface of each target.
Alternatively, the camera 30 employed in the embodiment of the present invention is a high-speed camera.
Optionally, in this embodiment of the present invention, the pattern adopted on the reflective surface of the target 10 is a checkerboard pattern.
In one embodiment, as shown in fig. 2a or fig. 2b, each target (the target 10a with a conical base shown in fig. 2a, and the target 10b with a flat mechanism base shown in fig. 2 b) used in the embodiments of the present invention may include: a base 101, a connecting rod 102 and a target plate 103; the target plate 103 is connected with the base 101 through a connecting rod 102 and is arranged on the ground of the area to be detected through the base 101; each target board 103 has at least one reflective surface, and the reflective surface is provided with a sticker 104 with a preset pattern. In the case of a checkerboard pattern on the reflective surface of the target 10, a piece of sticker with a checkerboard pattern may be attached to the target plate 103.
The paster is a detachable component, so that the aim of convenient replacement can be fulfilled; after the sticker is used for a long time, if the ball on the sticker is not clear, or under the condition that the pattern type of the reflecting surface of the target board needs to be changed, different stickers can be changed quickly and conveniently.
It should be noted that, in the embodiment of the present invention, the number of the targets 10 laid on the ground of the region to be tested and the size of the target plate 103 of each target 10 or the size of the sticker 104 on the target plate may be adjusted according to the actual test requirement or the field range (i.e., the size of the field of view) of the camera, which is not limited in the present invention.
In one embodiment, in the present invention, the targets 10 may be arranged in multiple rows, and each row is arranged on the ground of the region to be measured in a step manner. The targets 10 are sequentially installed from low to high from near to far from the camera 30 to form a ladder layout, but the reflection patterns of the targets 10 are obtained to fall in the field of view of the camera 30 without being shielded, so that the ground vibration amplitude-frequency characteristics of the positions of the targets 10 are analyzed according to the collected motion video images of the reflection surface patterns of the targets 10.
It should be noted that, when arranging the targets 10 in a plurality of rows in a stepped manner, if the targets 10 are height-adjustable targets (for example, the connecting rods 102 of the targets 10 are telescopic rods), the targets 10 to be arranged are arranged in a plurality of rows, each row includes a plurality of targets, and the heights of the rows of targets 10 are adjusted in such a manner that the distances between the rows and the camera 30 gradually increase from near to far, so that the reflection surfaces of the targets 10 arranged on the ground of the region to be measured are positioned within the field of view of the camera 30 without being blocked; if the targets 10 are non-height adjustable targets, other means may be used, such as height adjustment using multiple pads, or arranging the targets in other ways, so long as the reflective surface pattern of each target falls unobstructed within the field of view of the camera.
For the base 101 of each target 10, a conical structure shown in fig. 2a can be adopted, so as to be arranged on the ground of the area to be measured by inserting into the ground; the planar structure shown in fig. 2b may also be adopted, and the planar structure is arranged on the ground of the area to be measured through expansion bolts. In specific implementation, for soft ground, the target shown in fig. 2a can be used, and is fixed with the ground by means of insertion; for hard ground, the target shown in fig. 2b can be used, and fixed with the ground through expansion bolts.
As can be seen from the above, in the ground vibration signal measurement system provided in the embodiment of the present invention, the plurality of non-shielding targets are arranged on the ground of the region to be measured, and under the condition that the signal exciter generates the vibration signal for exciting the ground vibration of the region to be measured, the video image of the reflection surface of each target is acquired by the camera, and then the ground vibration signal information of the region to be measured is determined according to the video image of the reflection surface of each target by the computing device.
The ground vibration signal measurement system provided by the embodiment of the invention can adopt a non-contact mode to carry out multi-point measurement on the ground vibration signal, and synchronously extract the two-dimensional component vibration of each point in real time, not only can analyze the frequency characteristic of the ground vibration signal, but also can analyze the amplitude characteristic of the ground vibration signal according to the extraction result, and has the advantages of strong anti-interference capability, high precision, suitability for wide-band measurement and the like.
In specific implementation, a field worker can measure the ground vibration signal through the following steps:
firstly, manufacturing a target:
and manufacturing targets with a certain size and quantity according to the requirement, and flatly sticking the checkerboard pattern stickers on the target plates of each target.
Installing a target:
arranging the targets on the ground of the area to be detected, adopting the targets of the planar structure bases if the ground of the area to be detected is a hard ground, and fixing the bases of the targets through expansion bolts; if the ground of the area to be detected is soft ground, the target with the conical structure base is adopted, and the base of the target is inserted into the ground to a certain depth and tamped, so that the target can receive effective vibration signals.
Installing and adjusting the high-speed camera:
mounting a lens of a high-speed camera on a tripod, fixing the lens on the tripod, presetting a height (for example, 5-15 meters) from the ground to be detected, adjusting the focal length of the lens of the high-speed camera to enable the field range of the high-speed camera to cover all targets on the ground of the area to be detected, and further finely adjusting the field range of the high-speed camera until the reflecting surface patterns of all targets in the area to be detected can be completely covered;
exciting a ground vibration signal:
exciting vibration signals with intensity, frequency and the like which accord with experimental requirements at a certain distance from a target plate according to the characteristics and requirements of the detected signals;
collecting ground vibration signals:
and turning on the high-speed camera to shoot vibration videos of the targets. The frame rate of the high speed camera may be set based on an estimate of the frequency of the ground vibration signal.
Sixthly, video data transmission:
after the video images of the targets are captured by the high-speed camera, the video data is imported to a data processing device such as a computer through an output interface of the high-speed camera.
Processing video data:
a. dividing the image into subareas with the number of target plates according to the position of each target plate in the image, and independently performing subsequent processing analysis on each area (fig. 3 shows an analysis process of dividing the image into three subareas);
b. performing feature extraction on the X-corner points in each sub-region of each frame of image by adopting an X-corner sub-pixel feature extraction algorithm, respectively calculating an average value (X0, y0) in the X direction and the y direction, and taking the calculated average value (X0, y0) as an average position coordinate of each sub-region of each frame of image;
c. after the average position coordinates of each subregion in each frame of image are obtained, the average position coordinates of all the frame images are calculated as the pixel-level spatial vibration of the subregion, the vibration amplitude of each subregion is further calculated according to the spatial distance corresponding to each pixel value, and Fourier transform is performed on the vibration signals of each subregion to obtain the first two-order modal frequency of ground vibration.
Taking the reflecting surface of the target as a checkerboard pattern as an example, the checkerboard used may include as many checkerboard X-corner points as possible, and each black or white checkerboard corresponds to more than 2 pixels in the image shot by the high-speed camera. For soft soil, inserting a target with a conical structure base into the ground for fixing; for hard ground (e.g., cement road ground), a target with a planar structure base is adopted, and the target is fixed by using expansion bolts. And placing a plurality of rows of targets in the area to be detected, wherein a plurality of points are distributed in each row and are distributed on the ground of the whole area to be detected. The position of the row closest to the high-speed camera is the lowest, the height of the targets is higher the farther away, the stepped arrangement is presented, and the images of the targets in the high-speed camera are not shielded. The focal length and the visual field of a lens can be selected and adjusted according to the distribution of each target distributed on the ground of a region to be tested, a vibration video of each target of the region to be tested during vibration is shot through a high-speed camera, the shot video data is imported into a computer and other equipment for data processing, an image is divided into a plurality of sub-regions according to the position of the target by using a computer vision algorithm, the X-corner coordinates of each sub-region are extracted, the average coordinates are calculated, and the pixel-level vibration curve of each sub-region is recorded and adjusted. The pixel-level vibration curve is converted into a vibration curve with a length variable such as millimeters or micrometers according to the size of the checkerboard and the number of occupied pixels.
Based on the same inventive concept, the embodiment of the invention also provides a ground vibration signal measuring method, which can be applied to but not limited to the ground vibration signal measuring system shown in fig. 1. As described in the examples below. Because the principle of solving the problem of the embodiment of the method is similar to that of the ground vibration signal measurement system, the implementation of the embodiment of the method can be referred to that of the embodiment of the system, and repeated parts are not repeated.
Fig. 4 is a flowchart of a method for measuring a ground vibration signal according to an embodiment of the present invention, and as shown in fig. 4, the method may include the following steps:
s401, controlling a signal exciter to generate a vibration signal for exciting the ground of a region to be tested to vibrate, wherein the ground of the region to be tested is provided with a plurality of targets, the reflecting surface of each target is not shielded, and the reflecting surface of each target is provided with a preset pattern;
s402, controlling a camera to collect video images of all target reflecting surfaces;
and S403, determining ground vibration signal information of the area to be detected according to the video image of each target reflection surface.
Specifically, S403 may be implemented by the following steps: dividing each frame of image into a plurality of subarea images according to the position of each target in each frame of image; extracting the X-corner coordinate position of each sub-region image in each frame of image by adopting an X-corner sub-pixel feature extraction algorithm, and calculating the average coordinate position of each sub-region image in each frame of image; determining a pixel-level vibration curve corresponding to each subregion image according to the average coordinate position of each subregion image in all the frame images; converting the pixel-level vibration curve corresponding to each subregion image into the amplitude of the ground vibration signal corresponding to each target position according to the size information and the number of occupied pixels of the preset pattern on each target reflection surface; and carrying out Fourier transform on the amplitude of the ground vibration signal corresponding to each target position to obtain the frequency of the ground vibration signal of the area to be detected.
As can be seen from the above, in the ground vibration signal measurement method provided in the embodiment of the present invention, a plurality of non-blocking targets are arranged on the ground of the region to be measured, and under the condition that the signal exciter generates the vibration signal for exciting the ground vibration of the region to be measured, the video image of each target reflection surface is acquired by the camera, so that the ground vibration signal information of the region to be measured is determined according to the video image of each target reflection surface.
The ground vibration signal measuring method provided by the embodiment of the invention can be used for measuring multiple points of the ground vibration signal in a non-contact mode, synchronously extracting the two-dimensional component vibration of each point in real time, analyzing the frequency characteristic of the ground vibration signal and the amplitude characteristic of the ground vibration signal according to the extraction result, and has the advantages of strong anti-interference capability, high precision, suitability for wide-band measurement and the like.
Based on the same inventive concept, an embodiment of the present invention further provides a ground vibration signal measuring apparatus, fig. 5 is a schematic diagram of the ground vibration signal measuring apparatus provided in the embodiment of the present invention, and as shown in fig. 5, the apparatus may include: an excitation signal control module 51, a high-speed photography control module 52 and a ground vibration signal analysis module 53.
The excitation signal control module 51 is configured to control the signal exciter to generate a vibration signal for exciting ground vibration of the area to be detected, wherein the ground of the area to be detected is provided with a plurality of targets, a reflection surface of each target is not shielded, and a reflection surface of each target is provided with a preset pattern;
the high-speed photography control module 52 is used for controlling the camera to acquire video images of all target reflecting surfaces;
and the ground vibration signal analysis module 53 is configured to determine ground vibration signal information of the region to be detected according to the video image of each target reflection surface.
As can be seen from the above, in the ground vibration signal measurement apparatus provided in the embodiment of the present invention, a plurality of non-shielding targets are disposed on the ground of the region to be measured, and the excitation signal control module 51 controls the control signal exciter to generate a vibration signal for exciting the ground vibration of the region to be measured; under the condition that the signal exciter generates vibration signals for exciting ground vibration of the area to be detected, the high-speed photography control module 52 controls the camera to collect video images of all target reflecting surfaces, and finally the ground vibration signal analysis module 53 determines ground vibration signal information of the area to be detected according to the video images of all target reflecting surfaces.
The ground vibration signal measuring device provided by the embodiment of the invention can adopt a non-contact mode to carry out multi-point measurement on the ground vibration signal, carries out real-time synchronous extraction on the two-dimensional component vibration of each point, can analyze not only the frequency characteristic of the ground vibration signal but also the amplitude characteristic of the ground vibration signal according to the extraction result, and has the advantages of strong anti-interference capability, high precision, suitability for wide-band measurement and the like.
Based on the same inventive concept, the embodiment of the invention also provides a computer device, which is used for solving the technical problems that the existing ground vibration measurement method has weak anti-interference capability and low precision and cannot realize broadband measurement.
Based on the same inventive concept, the embodiment of the present invention further provides a computer readable storage medium, so as to solve the technical problems that the existing ground vibration measurement method has weak anti-interference capability, low precision and cannot realize broadband measurement.
In summary, embodiments of the present invention provide a system, a method, an apparatus, a computer device and a computer-readable storage medium for measuring a ground vibration signal, which can achieve, but are not limited to, the following technical effects: (1) the range of measuring the ground vibration can be adjusted according to actual needs, and the vibration range to be measured can be adjusted by adjusting the number of targets distributed in the area to be measured and the placing positions of the targets; (2) the ground vibration signals are acquired by the high-speed camera in a non-contact mode, so that the problem that measurement cannot be performed or the precision is reduced due to factors such as natural frequency, environmental hazards, electromagnetic interference and the like can be solved; (3) the method can support measurement of a plurality of points on the ground, and can synchronously extract two-dimensional component vibration in real time for each point; therefore, the ground vibration extraction result not only supports the frequency characteristic analysis of the ground vibration signal, but also supports the analysis of the vibration amplitude.
It should be noted that the traditional contact measurement methods such as the detector are weak in anti-interference capability and easy to be restricted by natural frequency, and the measurement method provided by the embodiment of the invention adopts non-contact acquisition and is strong in anti-interference capability; the traditional wave detector and other contact type measuring methods can only extract one-dimensional signals, and the measuring method provided by the embodiment of the invention can extract two-dimensional signals for each point; the traditional laser vibration measurement method can only measure one point, and the measurement method provided by the embodiment of the invention can measure a plurality of points simultaneously; the traditional measuring method only supports the analysis of frequency characteristics, and the measuring method provided by the embodiment of the invention can simultaneously analyze the frequency and the amplitude.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A ground vibration signal measurement system, comprising: a plurality of targets (10), a signal energizer (20), a camera (30) and a computing device (40);
the targets (10) are arranged on the ground of the area to be detected, and the reflecting surface of each target (10) is not shielded; the reflecting surface of each target (10) is provided with a preset pattern;
the signal exciter (20) is arranged at a first preset position of the ground and is used for generating a signal for exciting ground vibration in the area to be tested;
the camera (30) is arranged at a second preset position on the ground and is used for collecting video images of the reflecting surface of each target (10) under the condition that the signal exciter (20) generates a signal for exciting ground vibration in the area to be detected;
the computing equipment (40) is communicated with the camera (30) and used for determining the ground vibration signal information of the area to be measured according to the video image collected by the camera (30).
2. The system according to claim 1, characterized in that a plurality of said targets (10) are arranged in a plurality of rows, each row being arranged in the form of a ladder on the ground of the area to be measured.
3. The system of claim 1, wherein each of the targets (10) comprises: the device comprises a base (101), a connecting rod (102) and a target plate (103);
the target board (103) is connected with the base (101) through the connecting rod (102) and is arranged on the ground of the area to be measured through the base (101); each target board (103) is provided with at least one reflecting surface, and the reflecting surface is provided with a sticker (104) with a preset pattern.
4. The system of claim 3, wherein the pattern of decals (104) is a checkerboard.
5. The system according to claim 3, characterized in that the base (101) of each target (10) is a cone-shaped structure and is arranged on the ground of the area to be measured by means of inserting into the ground.
6. The system according to claim 3, characterized in that the base (101) of each target (10) is a planar structure and is arranged on the ground of the area to be measured through expansion bolts.
7. The system of claim 1, wherein the system further comprises:
and the bracket (50) is arranged at the second preset position on the ground and is used for supporting the camera (30) so that the reflecting surface of each target board (103) is within the field of view of the camera (30).
8. The system of claim 7, wherein the system further comprises:
and the cloud platform (60) is arranged at the top of the bracket (50) and is used for installing the camera (30).
9. The system according to any one of claims 1 to 8, wherein the camera (30) is a high speed camera.
10. A method of measuring a ground vibration signal, comprising:
the method comprises the steps that a signal exciter is controlled to generate a vibration signal for exciting the ground of a region to be tested to vibrate, wherein the ground of the region to be tested is provided with a plurality of targets, the reflecting surface of each target is not shielded, and the reflecting surface of each target is provided with a preset pattern;
controlling a camera to acquire video images of the reflecting surfaces of the targets;
and determining the ground vibration signal information of the area to be detected according to the video image of each target reflection surface.
11. The method of claim 10, wherein determining the ground vibration signal information of the area to be measured from the video images of the respective target reflecting surfaces comprises:
dividing each frame of image into a plurality of subarea images according to the position of each target in each frame of image;
extracting the X-corner coordinate position of each sub-region image in each frame of image by adopting an X-corner sub-pixel feature extraction algorithm, and calculating the average coordinate position of each sub-region image in each frame of image;
determining a pixel-level vibration curve corresponding to each subregion image according to the average coordinate position of each subregion image in all the frame images;
converting the pixel-level vibration curve corresponding to each subregion image into the amplitude of the ground vibration signal corresponding to each target position according to the size information and the number of occupied pixels of the preset pattern on each target reflection surface;
and carrying out Fourier transform on the amplitude of the ground vibration signal corresponding to each target position to obtain the frequency of the ground vibration signal of the area to be detected.
12. A ground vibration signal measuring apparatus, comprising:
the excitation signal control module is used for controlling the signal exciter to generate a vibration signal for exciting the ground vibration of the area to be tested, wherein the ground of the area to be tested is provided with a plurality of targets, the reflecting surface of each target is not shielded, and the reflecting surface of each target is provided with a preset pattern;
the high-speed photography control module is used for controlling the camera to acquire video images of the reflecting surfaces of the targets;
and the ground vibration signal analysis module is used for determining the ground vibration signal information of the area to be detected according to the video image of each target reflecting surface.
13. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the ground vibration signal measurement method of claim 10 or 11 when executing the computer program.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the ground vibration signal measurement method according to claim 10 or 11.
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