Three-dimensional deformation monitoring device and method based on optical fiber sensing and storage medium

Abstract

The invention discloses a three-dimensional deformation monitoring device and method based on optical fiber sensing and a storage medium, and can be applied to the technical field of deformation monitoring of rock soil and structural engineering. According to the monitoring device, the plurality of measuring rods are connected in series through the spherical hinge, the spherical hinge is sleeved with the universal joint spring, the plurality of optical fibers are adhered to the outer wall of the universal joint spring, the two ends of each optical fiber are fixedly connected with the two ends of the universal joint spring, and the plurality of optical gratings are engraved on each optical fiber, so that the monitoring accuracy can be improved, and the monitoring range can be expanded; connecting an optical fiber demodulator with the optical fiber; when the three-dimensional deformation monitoring device is in a working state, the optical fiber demodulator detects the working wavelength of each optical fiber, and a three-dimensional deformation monitoring result including the deformation direction and the deformation displacement of the to-be-monitored area is calculated through the processing unit according to the working wavelength and the central axis length of the universal joint spring. Therefore, the MEMS technology does not need to be adopted for three-dimensional deformation monitoring, and the monitoring cost is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of deformation monitoring of geotechnical and structural engineering, and in particular to a three-dimensional deformation monitoring device and method based on optical fiber sensing and a storage medium. Background Art

[0002] Among the related technologies, safety monitoring is the basic means of safety status assessment during the construction and service period of tunnel and slope engineering, and is also an important part of the dynamic design of geotechnical engineering. At present, most of the deformation monitoring of geotechnical engineering adopts monitoring technologies such as geodetic measurement and electrical measurement sensors, and calculates the deformation of rock and soil bodies by the position change of independently buried measuring points or markers. There are problems such as limited number of measuring points and low spatial coverage.

[0003] With the development of intelligent engineering, three-dimensional deformation monitoring sensors based on micro-electromechanical systems (MEMS) technology have realized the measurement of displacement (deformation), angle, acceleration, vibration, temperature, etc. in three-dimensional space. However, the equipment is expensive, has a limited monitoring range, and the monitoring accuracy will decrease with the increase of usage time.

[0004] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the invention

[0005] The main purpose of the embodiments of the present application is to propose a three-dimensional deformation monitoring device and method based on optical fiber sensing and a storage medium, which can effectively reduce the monitoring cost, expand the monitoring range and improve the monitoring accuracy.

[0006] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application provides a three-dimensional deformation monitoring device based on optical fiber sensing, wherein the monitoring device is buried in the area to be monitored, and the device comprises:

[0007] Several measuring rods;

[0008] A plurality of ball joints, through which a plurality of measuring rods are connected;

[0009] A universal joint spring, wherein the ball joint covers the universal joint spring;

[0010] A plurality of optical fibers, the outer wall of the universal joint spring is adhered with the plurality of optical fibers, and both ends of the optical fibers are fixedly connected to both ends of the universal joint spring; each of the optical fibers is engraved with a plurality of gratings;

[0011] An optical fiber demodulator, which is connected to the optical fiber and is used to detect the working wavelength of each optical fiber when the three-dimensional deformation monitoring device is in working state;

[0012] A processing unit connected to the optical fiber demodulator; when the three-dimensional deformation monitoring device is in working state, it is used to calculate the three-dimensional deformation monitoring result according to the working wavelength and the central axis length of the universal joint spring, and the three-dimensional deformation monitoring result includes the deformation direction and deformation displacement of the area to be monitored.

[0013] In some embodiments, the number of the optical fibers is 6; the 6 optical fibers are arranged in the outer ring of the universal joint spring at an interval of 60°.

[0014] In some embodiments, the three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, including:

[0015] Calculating the deformation increase of the universal joint spring according to the working wavelength and the length of the central axis of the universal joint spring;

[0016] The deformation line length of the universal joint spring in the three-dimensional deformation monitoring result is calculated according to the central axis length and the deformation increase.

[0017] In some embodiments, the three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, and further includes:

[0018] The deflection angle of the universal joint spring in the three-dimensional deformation monitoring result is obtained by calculating the deformation line length of the universal joint spring.

[0019] In some embodiments, the three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, and further includes:

[0020] The bending angle of the universal joint spring in the three-dimensional deformation monitoring result is calculated according to the deformation line length of the universal joint spring and the deflection angle of the universal joint spring.

[0021] In some embodiments, the three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, and further includes:

[0022] Obtaining a first length of the measuring rod and a second length of the universal joint in the universal joint spring;

[0023] Calculate a third length according to the first length and the second length;

[0024] Calculate a first rotation matrix of the measuring rod according to the deflection angle;

[0025] Calculate a second rotation matrix of the measuring rod according to the bending angle;

[0026] The end point coordinates of each measuring rod in the three-dimensional deformation monitoring result are calculated according to the third length, the first rotation matrix and the second rotation matrix.

[0027] In some embodiments, the step of calculating the end point coordinates of each measuring rod in the three-dimensional deformation monitoring result according to the third length, the first rotation matrix, and the second rotation matrix includes:

[0028] Calculate a third rotation matrix according to the first rotation matrix and the second rotation matrix;

[0029] Calculate the end point coordinates of each measuring rod in the three-dimensional deformation monitoring result according to the third length and the third rotation matrix;

[0030] Wherein, the formula of the third rotation matrix is ​​as follows:

[0031] R i =R z (φ)R y (θ);

[0032] In the formula, R i Represents the third formula; R z (φ) represents the first rotation matrix, R y (θ) represents the second rotation matrix.

[0033] In some embodiments, the formula for calculating the coordinates of the end point of each measuring rod in the three-dimensional deformation monitoring result according to the third length and the third rotation matrix is ​​as follows:

[0034]

[0035] In the formula, P k represents the end point coordinate of the kth measuring rod; L represents the third length.

[0036] To achieve the above object, another aspect of the embodiment of the present application provides a monitoring method applied to the above-mentioned three-dimensional deformation monitoring device based on optical fiber sensing, the method comprising the following steps:

[0037] Obtain the working wavelength of the optical fiber monitored by the optical fiber demodulator;

[0038] Get the length of the central axis of the universal joint spring;

[0039] A three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length, and the three-dimensional deformation monitoring result includes a deformation direction and a deformation displacement of the area to be monitored.

[0040] To achieve the above objective, another aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the above method when executed by a processor.

[0041] The embodiments of the present application include at least the following beneficial effects: The present application provides a three-dimensional deformation monitoring device and method based on fiber optic sensing and a storage medium. The scheme is through setting up a three-dimensional deformation monitoring device based on fiber optic sensing, in which a plurality of measuring rods are connected in series through a ball joint, and a universal joint spring is placed on the ball joint sleeve, a plurality of optical fibers are adhered to the outer wall of the universal joint spring and both ends of the optical fibers are fixedly connected to the two ends of the universal joint spring, and a plurality of gratings are engraved on each optical fiber, so as to improve the monitoring accuracy and expand the monitoring range, and then the optical fiber demodulator is connected to the optical fiber; when the three-dimensional deformation monitoring device is in working state, the optical fiber demodulator detects the working wavelength of each of the optical fibers, and the processing unit calculates the three-dimensional deformation monitoring result including the deformation direction and deformation displacement of the area to be monitored according to the working wavelength and the central axis length of the universal joint spring, thereby eliminating the need to use MEMS technology for three-dimensional deformation monitoring, and effectively reducing the monitoring cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a partial structural cross-sectional view of a three-dimensional deformation monitoring device based on optical fiber sensing provided in an embodiment of the present application;

[0043] Figure 2 is a partial structural exploded view of a three-dimensional deformation monitoring device based on optical fiber sensing provided in an embodiment of the present application;

[0044] Figure 3 It is a partial structural plan view of a three-dimensional deformation monitoring device based on optical fiber sensing provided in an embodiment of the present application;

[0045] Figure 4 is a deformation diagram of a universal joint spring provided in an embodiment of the present application;

[0046] Figure 5 The embodiment of this application provides Figure 4 A schematic diagram of a plane in which mapping is performed perpendicular to plane 510;

[0047] Figure 6 It is a cross-sectional schematic diagram of an optical fiber and a spring provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application, they are only examples of devices and methods consistent with some aspects of the embodiments of the present application.

[0049] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0050] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0052] In the related art, the existing three-dimensional deformation monitoring methods have the following problems: (1) The inclination sensor installed on the standard length measuring rod is used to collect the relative change of the measuring rod inclination. Generally, the inclination change in one direction or two directions perpendicular to each other is monitored, and the actual inclination direction and inclination angle cannot be directly obtained; (2) The sensors of standard length are independent of each other, and the number of collecting cables is limited by the space of the inclinometer tube, and the monitoring range is limited; (3) The deformation caused by the torsion of the side inclinometer tube will have an adverse effect on the accuracy of the measurement results. It is necessary to measure the torsion of the inclinometer tube regularly and correct the measurement results. In special circumstances, measurement correction may not be possible.

[0053] In view of this, a three-dimensional deformation monitoring device based on fiber optic sensing is provided in an embodiment of the present application, in which a plurality of measuring rods are connected in series through a ball joint, and a universal joint spring is arranged on the ball joint sleeve, a plurality of optical fibers are adhered to the outer wall of the universal joint spring, and both ends of the optical fibers are fixedly connected to the two ends of the universal joint spring, and a plurality of gratings are engraved on each optical fiber, so as to improve the monitoring accuracy and expand the monitoring range, and then a fiber optic demodulator is connected to the optical fiber; when the three-dimensional deformation monitoring device is in working state, the fiber optic demodulator detects the working wavelength of each of the optical fibers, and the processing unit calculates the three-dimensional deformation monitoring result including the deformation direction and deformation displacement of the area to be monitored according to the working wavelength and the central axis length of the universal joint spring, thereby eliminating the need to use MEMS technology for three-dimensional deformation monitoring, effectively reducing the monitoring cost.

[0054] Figure 1 FIG. 1 is a partial structural cross-sectional view of a three-dimensional deformation monitoring device based on optical fiber sensing provided in an embodiment of the present application. Figure 1 , Figure 2 and Figure 3 It can be known that the device provided in the embodiment of the present application includes but is not limited to a plurality of measuring rods 110, a plurality of ball joints 120, a universal joint spring 130 and a plurality of optical fibers 140. Among them, the plurality of measuring rods 110 are connected in series through the ball joint 120, the ball joint 120 is covered with the universal joint spring 130, the optical fiber 140 is located on the outer wall of the universal joint spring 130 and both ends of the optical fiber 140 are fixedly connected to both ends of the universal joint spring 130, and each optical fiber is engraved with a plurality of gratings. Figure 1 and Figure 2 It can be seen that the ball joint 120 can be connected to the measuring rod 110 by means of the connecting screw 150. It can be understood that the number of optical fibers in this embodiment can be set to 6; the 6 optical fibers are arranged in the outer ring of the universal joint spring at intervals of 60 degrees.

[0055] When it is necessary to monitor the structural deformation of the monitored area, the three-dimensional deformation monitoring device of the embodiment of the present application is buried in any direction and angle as needed, and after the burial is completed, the two ends of the optical fiber are connected to the optical fiber demodulator to collect the working wavelength of the optical fiber in real time through the optical fiber demodulator, and the collected working wavelength is sent to the processing unit for three-dimensional deformation calculation, such as calculation of deformation direction and deformation displacement.

[0056] It can be understood that the calculation process can calculate the deformation increase of the universal joint spring according to the working wavelength and the central axis length of the universal joint spring, and then calculate the deformation line length of the universal joint spring in the three-dimensional deformation monitoring result according to the central axis length and the deformation increase. Then, the deflection angle of the universal joint spring in the three-dimensional deformation monitoring result is calculated according to the deformation line length of the universal joint spring, and the bending angle of the universal joint spring in the three-dimensional deformation monitoring result is calculated according to the deformation line length of the universal joint spring and the deflection angle of the universal joint spring.

[0057] For example, Figure 4 and Figure 5 For example. Figure 4 As shown, the length of the central axis of the optical fiber bonding universal joint spring is l, which is the original length of the optical fiber. The radius of the circle on the outer surface of the spring is r. The coordinate system is established with the position of the first optical fiber as the X-axis. The deflection angle between the bending direction and the X-axis is φ, the bending angle of the central axis is θ, and the strain force of each optical fiber is ε j , and ε=Δl / l, so the deformation line length of the jth optical fiber is l j =l+Δl. Figure 5 The geometric relationship of R j =R-rcosφ j ,Depend on Figure 5 and Figure 6 It can be obtained that φ1=φ, φ4=φ+π、 and From l = θR, we can get the deformation line length of the jth optical fiber as l j =R j ×θ=1-rθcosφ j , and then the deflection angle φ and bending angle θ of the universal joint spring are obtained.

[0058] In this embodiment, if Figure 6 The cross-sectional diagram of the optical fiber and the universal joint spring is shown in FIG. Figure 6 The optical fibers in the figure include those corresponding to serial numbers 1, 2, 3, 4, 5, and 6. When the spring is bent, only half of the circular cross section is compressed and the other half is tensile, the compressed part is relaxed, the optical fiber does not strain, and only the tensile area is strained. If the neutral axis (diameter) of the circular cross section is on the line connecting two optical fibers symmetrical along the center of the circle, for example, when bending occurs, the neutral axis is the straight line where 1-4 is located, that is, the optical fibers at 1 and 4 do not deform, and 2 and 3 are tensile optical fibers, and only the optical fibers at 2, 3 or 5 and 6 are stretched or relaxed. At this time, take 1, 4 and any three optical fibers in the deformed optical fiber group for calculation. If 1, 2, and 3 are taken, the result is as ①; if 2, 3, and 4 are taken, the result is as ②.

[0059] Specifically, combined Figure 5From the geometric relationship shown, it can be seen that the following six situations may occur during the operation of the monitoring device of the embodiment of the present application:

[0060] cosφ1=cosφ;

[0061]

[0062]

[0063] cosφ4=cos(φ+π)=-cosφ;

[0064]

[0065]

[0066] Based on these calculations, Figure 6 Taking the layout shown in the figure as an example, the six calculation processes are as follows:

[0067] ① Taking the tension of optical fibers 1, 2, and 3 as an example, calculate the deflection angle φ and bending angle θ of the universal joint spring:

[0068] It is known that l1=1-rθcosφ1, l2=1-rθcosφ2, l3=1-rθcosφ3, l1-l2=rθ(cosφ2-cosφ1) and l2-l3=rθ(cosφ3-cosφ2);

[0069] Right now

[0070] and cosφ3-cosφ2=-cosφ;

[0071] From this we can get:

[0072]

[0073]

[0074] ② Taking the tension of optical fibers 2, 3, and 4 as an example, calculate the deflection angle φ and bending angle θ of the universal joint spring:

[0075] It is known that l2=1-rθcosφ2, l3=1-rθcosφ3, l4=1-rθcosφ4, l2-l3=rθ(cosφ3-cosφ2) and l3-l4=rθ(cosφ4-cosφ3);

[0076] Right now

[0077] and cosφ3-cosφ2=-cosφ;

[0078] From this we can get:

[0079]

[0080]

[0081] ③ Taking the tensile condition of optical fibers 3, 4, and 5 as an example, calculate the deflection angle φ and bending angle θ of the universal joint spring:

[0082] It is known that l3=1-rθcosφ3, l4=1-rθcosφ4, l5=1-rθcosφ5, l3-l4=rθ(cosφ4-cosφ3) and l4-l5=rθ(cosφ5-cosφ4);

[0083] Right now

[0084] and

[0085] From this we can get:

[0086]

[0087]

[0088] ④ Taking the tension of optical fibers 4, 5, and 6 as an example, calculate the deflection angle φ and bending angle θ of the universal joint spring:

[0089] It is known that l4=1-rθcosφ4, l5=1-rθcosφ5, l6=1-rθcosφ6, l4-l5=rθ(cosφ5-cosφ4) and l5-l6=rθ(cosφ6-cosφ5);

[0090] Right now

[0091] and cosφ6-cosφ5=cosφ;

[0092] From this we can get:

[0093]

[0094]

[0095] ⑤ Taking the tensile condition of optical fibers 5, 6, and 1 as an example, calculate the deflection angle φ and bending angle θ of the universal joint spring:

[0096] It is known that l5=1-rθcosφ5, l6=1-rθcosφ6, l1=1-rθcosφ1, l5-l6=rθ(cosφ6-cosφ5) and l6-l1=rθ(cosφ1-cosφ6);

[0097] Right now

[0098] And cosφ6-cosφ5=cosφ,

[0099] From this we can get:

[0100]

[0101]

[0102] ⑥ Taking the case of optical fibers 6, 1, and 2 being pulled, calculate the deflection angle φ and bending angle θ of the universal joint spring:

[0103] It is known that l6=1-rθcosφ6, l1=1-rθcosφ1, l2=1-rθcosφ2, l6-l1=rθ(cosφ1-cosφ6) and l1-l2=rθ(cosφ2-cosφ1);

[0104] Right now

[0105] and

[0106] From this we can get:

[0107]

[0108]

[0109] Wherein, l1, l2, l3, l4, l5 and l6 represent the deformation line lengths of the 1st, 2nd, 3rd, 4th, 5th and 6th optical fibers respectively, and φ1, φ2, φ3, φ4, φ5 and φ6 represent the deflection angles of the 1st, 2nd, 3rd, 4th, 5th and 6th optical fibers with respect to the X-axis respectively.

[0110] When calculating the three-dimensional deformation monitoring results of the area to be monitored, the first length of the measuring rod and the second length of the universal joint in the universal joint spring can be obtained, and the third length can be calculated according to the first length and the second length. At the same time, the first rotation matrix of the measuring rod is calculated according to the deflection angle, and the second rotation matrix of the measuring rod is calculated according to the bending angle. Then, the end point coordinates of each measuring rod in the three-dimensional deformation monitoring results are calculated according to the third length, the first rotation matrix, and the second rotation matrix. Specifically, after the third rotation matrix is ​​calculated according to the first rotation matrix and the second rotation matrix, the end point coordinates of each measuring rod in the three-dimensional deformation monitoring results can be calculated according to the third length and the third rotation matrix.

[0111] For example, assuming that the first length of each measuring rod is a and the second length of the universal joint spring is d, the third length is L=a+d. Since the monitored area may deform in any direction during the monitoring process, the Euler angle (0, θ i ,φ i ) description. Each third rotation matrix can be calculated from the first rotation matrix and the second rotation matrix:

[0112] The first choice matrix represents the matrix of rotation around the z-axis, and its formula is as follows:

[0113]

[0114] The second rotation matrix represents the matrix of rotation around the y-axis, and its formula is as follows:

[0115]

[0116] After combining the first rotation matrix and the second rotation matrix, the third rotation matrix is ​​obtained as shown below:

[0117] R i =R z (φ)R y (θ);

[0118] In the embodiment of the present application, when all measuring rods are connected in series through a ball joint, starting from the first measuring rod, the end point coordinates of each measuring rod are calculated recursively. Specifically, the initial point P0 = (0,0,0), the initial direction vector of each measuring rod is (L,0,0), then the end point coordinates P of the kth measuring rod are k As shown below:

[0119]

[0120] In the formula, P k represents the coordinates of the end point of the kth measuring rod; ∏ represents the cumulative product of the third matrix. If j=0, this product is defined as the unit matrix I.

[0121] From the above content, it can be seen that the features of the embodiments of the present application include the following points: (1) A ball joint is used to connect the measuring rod of standard length, and the ball joint is covered with a universal joint spring, so that the measuring rods at both ends can be constrained by the ball joint without axial displacement, and only relative angular deformation can be generated. (2) An array optical fiber is arranged at intervals of 60° in the outer ring of the universal joint spring, and a total of six fibers are arranged. Any two fibers symmetrical along the center form a group, which are divided into three groups in total. The optical fiber is located on the outer wall of the spring and the two ends of the optical fiber are fixed to the spring. Each optical fiber is engraved with several gratings. When the spring rotates, the strain force measured by the grating on the six optical fibers is used to calculate the relative rotation angle of the two measuring rods, including the angle of rotation on the rod section that deviates from the initial axis and the angle of rotation around the central axis of the rod. (3) During the rotation process, at least two fibers produce tensile strain, and at least two fibers are in a relaxed state and are only affected by temperature. The temperature influence of the tensile optical fiber can be corrected by another fiber in each group. (4) Since there are only six optical fibers when the measuring rods are connected in series, the space occupied does not increase with the number of measuring points. The number of measuring point units in series is only limited by the number of gratings that can be set on one optical fiber. The minimum length of the measuring unit can reach 20 centimeters, the total length of multiple measuring points in series can reach several kilometers, and the number of measuring point units can reach tens of thousands. (5) The series sensors are not affected by the installation strips and can be arranged in any direction to accurately monitor the three-dimensional deformation of the surface or interior of the rock and soil.

[0122] It can be seen that the monitoring device provided in the embodiment of the present application has the following beneficial effects:

[0123] (1) The embodiment of the present application adopts fiber Bragg grating sensing technology to reduce labor costs, and the device has a long service life, high accuracy, and can be reused, with high economic value. (2) The measuring rod of the embodiment of the present application is connected by a universal joint spring, and the spring can be bent in any direction. The optical fiber is arranged on the measuring rod, and the deformation in any direction in the rock and soil body can be measured, and the real-time information of the deep displacement of the soil body can be accurately monitored. Moreover, the arrangement is not affected by the terrain, which is convenient for construction. (3) The universal joint spring is embedded with a ball joint, and the two ends of the ball joint are connected to the measuring rod. The ball joint restricts the measuring rod to only rotate and does not cause axial displacement, eliminating the deformation of the spring under tension and compression, and can more accurately monitor the deep deformation of the soil body. (4) The fiber Bragg grating is in series mode, and the number of series connections can be increased as needed to expand the monitoring and measurement range of the deep deformation of the rock and soil body. (5) Six optical fibers are arranged on the universal joint spring. During the monitoring process, at least two optical fibers are stretched and two optical fibers are relaxed. The stretched optical fiber and the relaxed optical fiber are determined by observation, and then the wavelength data of the relaxed optical fiber are used to eliminate the influence of temperature on the fiber Bragg grating.

[0124] In addition, the present application also provides an embodiment of a Figure 1A monitoring method for a three-dimensional deformation monitoring device based on optical fiber sensing, the method includes but is not limited to the following steps:

[0125] Step S610, obtaining the working wavelength of the optical fiber monitored by the optical fiber demodulator;

[0126] Step S620, obtaining the central axis length of the universal joint spring;

[0127] Step S630: Calculate the three-dimensional deformation monitoring result according to the working wavelength and the central axis length, wherein the three-dimensional deformation monitoring result includes the deformation direction and deformation displacement of the area to be monitored.

[0128] It can be understood that the contents of the above-mentioned device embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above-mentioned device embodiments, and the beneficial effects achieved are also the same as those achieved by the above-mentioned device embodiments.

[0129] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the three-dimensional deformation monitoring method based on optical fiber sensing is implemented.

[0130] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiments, the functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0131] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0132] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0133] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0134] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0135] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0136] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0137] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0138] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0139] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0140] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0141] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0142] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A three-dimensional deformation monitoring device based on optical fiber sensing, characterized in that: The monitoring device is buried in the area to be monitored, and the device includes: Several measuring rods; A plurality of ball joints, through which a plurality of measuring rods are connected; A universal joint spring, wherein the ball joint covers the universal joint spring; A plurality of optical fibers, the outer wall of the universal joint spring is adhered with the plurality of optical fibers, and both ends of the optical fibers are fixedly connected to both ends of the universal joint spring; each of the optical fibers is engraved with a plurality of gratings; An optical fiber demodulator, which is connected to the optical fiber and is used to detect the working wavelength of each optical fiber when the three-dimensional deformation monitoring device is in working state; A processing unit connected to the optical fiber demodulator; when the three-dimensional deformation monitoring device is in working state, it is used to calculate the three-dimensional deformation monitoring result according to the working wavelength and the central axis length of the universal joint spring, and the three-dimensional deformation monitoring result includes the deformation direction and deformation displacement of the area to be monitored.

2. The device according to claim 1, characterized in that The number of the optical fibers is 6; the 6 optical fibers are arranged at intervals of 60° on the outer ring of the universal joint spring.

3. The device according to claim 1, characterized in that The three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, including: Calculating the deformation increase of the universal joint spring according to the working wavelength and the length of the central axis of the universal joint spring; The deformation line length of the universal joint spring in the three-dimensional deformation monitoring result is calculated according to the central axis length and the deformation increase.

4. The device according to claim 3, characterized in that The three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, and further includes: The deflection angle of the universal joint spring in the three-dimensional deformation monitoring result is obtained by calculating the deformation line length of the universal joint spring.

5. The device according to claim 4, characterized in that The three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, and further includes: The bending angle of the universal joint spring in the three-dimensional deformation monitoring result is calculated according to the deformation line length of the universal joint spring and the deflection angle of the universal joint spring.

6. The device according to claim 5, characterized in that The three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length of the universal joint spring, and further includes: Obtaining a first length of the measuring rod and a second length of the universal joint in the universal joint spring; Calculate a third length according to the first length and the second length; Calculate a first rotation matrix of the measuring rod according to the deflection angle; Calculate a second rotation matrix of the measuring rod according to the bending angle; The end point coordinates of each measuring rod in the three-dimensional deformation monitoring result are calculated according to the third length, the first rotation matrix and the second rotation matrix.

7. The device according to claim 6, characterized in that The step of calculating the end point coordinates of each measuring rod in the three-dimensional deformation monitoring result according to the third length, the first rotation matrix and the second rotation matrix includes: Calculate a third rotation matrix according to the first rotation matrix and the second rotation matrix; Calculate the end point coordinates of each measuring rod in the three-dimensional deformation monitoring result according to the third length and the third rotation matrix; Wherein, the formula of the third rotation matrix is ​​as follows: R i =R z (φ)R y (i); In the formula, R i represents the third formula; Rz(φ) represents the first rotation matrix, and Ry(θ) represents the second rotation matrix.

8. The device according to claim 7, characterized in that The formula for calculating the end point coordinates of each measuring rod in the three-dimensional deformation monitoring result according to the third length and the third rotation matrix is ​​as follows: In the formula, P k represents the end point coordinate of the kth measuring rod; L represents the third length.

9. A monitoring method applied to the three-dimensional deformation monitoring device based on optical fiber sensing according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Obtain the working wavelength of the optical fiber monitored by the optical fiber demodulator; Get the length of the central axis of the universal joint spring; A three-dimensional deformation monitoring result is calculated according to the working wavelength and the central axis length, and the three-dimensional deformation monitoring result includes a deformation direction and a deformation displacement of the area to be monitored.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to claim 9 is implemented.

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