Acoustic CT-based optimization method for spatial arrangement scheme of sound wave receiving and transmitting device

Abstract

The invention discloses a method for optimizing a spatial arrangement scheme of a sound wave transceiver based on acoustic CT, and the method comprises the steps: selecting a first to-be-measured region, carrying out the grid division of the to-be-measured region, calculating the reconstruction temperature data based on different grid division results, carrying out the error comparison of different reconstruction temperature data and standard temperature data, and obtaining the spatial arrangement scheme of the sound wave transceiver based on the first to-be-measured region. Obtaining a preliminary grid division scheme based on the comparison result; obtaining a second to-be-measured area, performing temperature field reconstruction of the acoustic CT temperature measurement technology based on the arrangement of an acoustic wave transceiver in the second to-be-measured area corresponding to the preliminary grid division scheme, obtaining a first reconstruction error, verifying whether the first reconstruction error is within a preset range, if the first reconstruction error exceeds the preset range, optimizing the preliminary grid division scheme, and if the first reconstruction error is within the preset range, optimizing the preliminary grid division scheme. Obtaining a second grid division scheme; and performing optimization based on a sound wave transceiver arrangement scheme corresponding to the second grid division scheme, and determining an optimization scheme. The system has the high anti-interference capability and the capability of monitoring the fire occurrence condition online in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel fire monitoring in fire safety, and in particular to an optimization method for a spatial arrangement scheme of a sound wave transceiver based on acoustic CT. Background Art

[0002] In order to ease traffic pressure, a large number of tunnels have been built and put into operation in recent decades. Since tunnels are long and narrow, once a fire occurs, the rapid spread and sedimentation of fire smoke will seriously obstruct vision, causing great difficulties for personnel evacuation and fire rescue. In order to improve the accuracy of acoustic CT temperature measurement technology for real-time monitoring of tunnel fires, the spatial layout of the acoustic CT sound wave transceiver is optimized.

[0003] The acoustic CT temperature field online monitoring technology based on computer tomography is an excellent non-contact temperature measurement technology. Its principle is to infer the distribution of target features in the measured medium based on the relationship between the propagation time of sound waves in the gas medium and the temperature, and then obtain a reconstructed image. It has the characteristics of wide temperature measurement range, high accuracy, real-time online detection and strong anti-interference ability.

[0004] In order to ensure the safe operation of the tunnel, improve the efficiency and reliability of the tunnel, and provide timely rescue on site after a fire accident, considering the application of acoustic CT monitoring technology in other industrial fields in recent years, it has the advantages of not being limited to special fire scenes, strong anti-interference ability and real-time online monitoring. However, there is not much research on the layout of the acoustic wave transceiver itself in existing applications, which needs further solution. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes an optimization method for the spatial layout of the sound wave transceiver based on acoustic CT, improves the accuracy of acoustic CT temperature measurement technology for real-time monitoring of tunnel fires, and optimizes the spatial layout of the sound wave transceiver of acoustic CT.

[0006] To achieve the above object, the present invention provides a method for optimizing the spatial arrangement of a sound wave transceiver device based on acoustic CT, comprising:

[0007] Arrange an acoustic wave transceiver in the target tunnel area based on the acoustic CT principle to obtain an effective acoustic wave path passing through the target tunnel area;

[0008] Selecting a first area to be measured within the target tunnel area, dividing the area to be measured into grids with different spacings, calculating and reconstructing temperature data based on different grid division results, performing error comparison between the different reconstructed temperature data and standard temperature data, and obtaining a preliminary grid division scheme based on the comparison results;

[0009] The first area to be measured is expanded to obtain a second area to be measured, and the temperature field of the acoustic CT temperature measurement technology is reconstructed based on the arrangement of the acoustic wave transceiver device in the second area to be measured corresponding to the preliminary grid division scheme to obtain a first reconstruction error, and verify whether the reconstruction error is within a preset range. If it is within the preset range, the preliminary grid division scheme is output, and if it exceeds the preset range, the preliminary grid division scheme is optimized to obtain a second grid division scheme;

[0010] The arrangement scheme of the acoustic wave transceiver device corresponding to the second grid division scheme is optimized to determine an optimization scheme.

[0011] Preferably, obtaining an effective sound wave path passing through the target tunnel area includes:

[0012] According to the acoustic CT principle, a certain number of sound wave transceivers are evenly arranged around the target tunnel area, and these sound wave transceivers are connected in pairs to form a number of sound wave paths. Without considering that the connecting lines are located on the boundary surface of the target tunnel area, M effective sound wave paths that pass through the target tunnel area are formed, and the target tunnel area is divided into N grids, where N<M.

[0013] Preferably, the first area to be tested is a square area to be tested with a side length of B and a preset length from the tunnel ceiling, the standard temperature data is the temperature data obtained in the first area to be tested in a tunnel fire experiment, and the reconstructed temperature data is the temperature data reconstructed by acoustic CT temperature measurement technology.

[0014] Preferably, performing an error comparison between the different reconstructed temperature data and the standard temperature data, and obtaining a preliminary grid division scheme based on the comparison result, comprises:

[0015] Comparing the reconstructed temperature data with the standard temperature data receipt image, and verifying through specific error limits, to obtain the preliminary grid division scheme;

[0016] The preliminary grid division scheme is: maxN={n×n, N≠K(m-1)}, n×n is the grid division scheme, m is the number of acoustic wave transceiver devices on one side, N is the number of divided grids, and K is a positive integer;

[0017] The specific error limit is: the root mean square percentage error and the average temperature relative error between the reconstructed temperature data and the standard temperature data are both less than a first threshold, and the maximum temperature relative error is less than a second threshold.

[0018] Preferably, the method for calculating the root mean square percentage error is:

[0019]

[0020] Where E is the root mean square percentage error, T Mmave is the average temperature of the basic temperature field, m is the total number of grids divided into the measured area, T M(i) is the original temperature of the center point of the i-th grid, T c(i) is the reconstructed temperature of the i-th grid center point;

[0021] The method for calculating the relative error of the average temperature is:

[0022]

[0023] In the formula, ε ave is the average temperature relative error, T Cave is the average temperature of the reconstructed temperature field, T Mave is the average temperature of the basic temperature field.

[0024] Preferably, the method for calculating the maximum temperature relative error is:

[0025]

[0026] In the formula, ε max is the maximum temperature relative error, T Cmax is the highest temperature value of the reconstructed temperature field, T Mmax is the highest temperature value of the original temperature field.

[0027] Preferably, the first area to be tested is expanded in the longitudinal direction to obtain the second area to be tested.

[0028] Preferably, optimizing the preliminary grid division scheme to obtain a second grid division scheme includes:

[0029] Based on the requirement of grid uniformity, the preliminary grid division scheme is optimized to maxN={n1×n2, n1≠k1(m1-1), n2≠k2(m2-1)}, and the second grid division scheme is obtained;

[0030] Where m1 is the number of acoustic wave transceivers in the longitudinal direction of the tunnel, m2 is the number of acoustic wave transceivers in the transverse direction of the tunnel, maxN is the number of optimized grids, n1 is the grid division in the longitudinal direction of the tunnel, n2 is the grid division in the transverse direction of the tunnel, and k1 and k2 are positive integers respectively.

[0031] Preferably, after obtaining the second grid division scheme, the method further includes increasing the number of sound wave transceivers, specifically b1=cb2, where b1 is the longitudinal spacing of the sound wave transceivers in the tunnel, b2 is the transverse spacing of the sound wave transceivers in the tunnel, and c is a positive integer.

[0032] Preferably, the optimization scheme is:

[0033] Based on the arrangement of the acoustic wave transceiver devices in the second test area corresponding to the second grid division scheme, the temperature field reconstruction of the acoustic CT temperature measurement technology is performed to obtain a second reconstruction error. If the second reconstruction error is within a preset range, the arrangement scheme of the acoustic wave transceiver devices with the least number of acoustic wave transceiver devices and the corresponding optimal grid division are selected.

[0034] Compared with the prior art, the present invention has the following advantages and technical effects:

[0035] The present invention can use acoustic CT technology in tunnel fire monitoring, so that it can achieve high anti-interference ability and real-time online monitoring of fire occurrence in not limited to special fire scenes, and provides an optimized arrangement scheme of sound wave transceiver devices based on the temperature reconstruction effect of acoustic CT temperature measurement technology. Under this scheme, it can meet the accuracy requirements with extremely high accuracy on the basis of greatly reducing economic costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0037] Figure 1 is a schematic diagram of an acoustic CT principle of an embodiment of the present invention;

[0038] Figure 2 It is a flow chart of a method for optimizing the spatial arrangement of a sound wave transceiver device based on acoustic CT according to an embodiment of the present invention;

[0039] Figure 3 A three-dimensional model diagram of a tunnel according to an embodiment of the present invention;

[0040] Figure 4 1 is a comparison diagram of reconstruction temperatures under three schemes of an embodiment of the present invention. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0043] The present invention proposes a method for optimizing the spatial arrangement of an acoustic wave transceiver based on acoustic CT, such as Figure 2 ,include:

[0044] Based on the principle of acoustic CT (such as Figure 1 ) deploying a sound wave transceiver in a target tunnel area to obtain an effective sound wave path passing through the target tunnel area;

[0045] Based on the effective sound wave path, a first area to be measured is selected within the target tunnel area, the area to be measured is meshed at different intervals, temperature data is reconstructed based on different meshing results, errors of the different reconstructed temperature data are compared with standard temperature data, and a preliminary meshing scheme is obtained based on the comparison results;

[0046] Expand the first area to be measured to obtain a second area to be measured, perform temperature field reconstruction using the acoustic CT temperature measurement technology based on the arrangement of the acoustic wave transceiver in the second area to be measured corresponding to the preliminary grid division scheme, obtain a first reconstruction error, and verify whether the reconstruction error is within a preset range. If it is within the preset range, output a preliminary grid division scheme. If it exceeds the preset range, optimize the preliminary grid division scheme to obtain a second grid division scheme.

[0047] The arrangement scheme of the acoustic wave transceiver device corresponding to the second grid division scheme is optimized to determine an optimization scheme.

[0048] The present invention can use acoustic CT technology in tunnel fire monitoring, so that it can achieve high anti-interference ability and real-time online monitoring of fire occurrence in not limited to special fire scenes, and provides an optimized arrangement scheme of sound wave transceiver devices based on the temperature reconstruction effect of acoustic CT temperature measurement technology. Under this scheme, it can meet the accuracy requirements with extremely high accuracy on the basis of greatly reducing economic costs.

[0049] Further, obtaining an effective sound wave path passing through the target tunnel area includes:

[0050] According to the acoustic CT principle, a first area to be tested is selected in the target tunnel area, a certain number of sound wave transceivers are evenly arranged around the first area to be tested, and these sound wave transceivers are connected in pairs to form a number of sound wave paths. Without considering that the connecting line is located on the boundary surface of the first area to be tested, M effective sound wave paths that pass through the first area to be tested are formed, and the first area to be tested is divided into N grids, where N<M.

[0051] Specifically, a first area to be tested is selected in the tunnel area, a certain number of sound wave transceivers are evenly arranged around the first area to be tested, and these sound wave transceivers are connected in pairs to form several sound wave paths. Without considering that the connecting lines are located on the boundary surface of the first area to be tested, M effective sound wave paths that pass through the first area to be tested can be formed.

[0052] If the first area to be tested is divided into N=n1×n2 grids, it is required that the first area to be tested N<M. In this embodiment, the shortest distance between the two sound wave transceivers is set to 2.5 m.

[0053] Furthermore, the first test area is a square test area with a side length of B and a preset length from the tunnel ceiling, the standard data is the temperature data obtained in the tunnel fire experiment of the first test area, and the reconstructed temperature data is the temperature data reconstructed by acoustic CT temperature measurement technology.

[0054] Specifically, in this embodiment, a first test area is selected at 0.17 m from the top of the tunnel for study. First, a square test area at the ceiling with a side length of the tunnel width B is selected for study, and sound wave transceivers are arranged at equal distances of 2.5 m around the square test area.

[0055] In order to optimize the spatial arrangement of the acoustic wave transceiver in the first test area, the error between the reconstructed temperature data of the first test area and the temperature data obtained in the tunnel fire experiment was used as the criterion. The temperature data obtained in the tunnel fire experiment was taken from the simulation of tunnel fire data in the fire dynamics simulation software (FDS), and its adaptability was verified by grid independence.

[0056] Furthermore, the errors of different reconstructed temperature data and standard temperature data are compared, and a preliminary grid division scheme is obtained based on the comparison results, including:

[0057] Compare the reconstructed temperature data with the standard temperature data receipt image and verify it through specific error limits to obtain a preliminary grid division scheme;

[0058] The preliminary grid division scheme is: maxN = {n×n, N≠K(m-1)}, n×n is the grid division scheme, m is the number of acoustic wave transceiver devices on one side, N is the number of divided grids, and K is a positive integer;

[0059] The specific error limits are: the root mean square percentage error and the average temperature relative error between the reconstructed temperature data and the standard temperature data are both less than a first threshold, and the maximum temperature relative error is less than a second threshold.

[0060] Specifically, a feasible grid division scheme for the selected square test area (the first test area) is determined. Different reconstruction temperature data can be obtained for the reconstruction effects under different grid division schemes. By comparing the error between the reconstructed temperature data and the temperature data obtained in the test area in the tunnel fire experiment, when E<5%, ε ave <5%,ε max When it is less than 15%, the feasibility and practical significance of this optimization plan can be determined.

[0061] Furthermore, the method for calculating the root mean square percentage error is:

[0062]

[0063] Where E is the root mean square percentage error, T Mmave is the average temperature of the basic temperature field, m is the total number of grids divided into the measured area, T M(i) is the original temperature of the center point of the i-th grid, T c(i) is the reconstructed temperature of the i-th grid center point;

[0064] The method for calculating the relative error of the average temperature is:

[0065]

[0066] In the formula, ε ave is the average temperature relative error, T Cave is the average temperature of the reconstructed temperature field, T Mave is the average temperature of the basic temperature field.

[0067] The method for calculating the maximum temperature relative error is:

[0068]

[0069] In the formula, ε max is the maximum temperature relative error, T Cmax is the highest temperature value of the reconstructed temperature field, T Mmax is the highest temperature value of the original temperature field.

[0070] Specifically, according to the temperature data reconstructed by the acoustic CT temperature measurement technology and the temperature data of the test area obtained in the tunnel fire experiment, relevant images can be drawn for intuitive comparison, and verified by the above-mentioned specific error limit, the optimal grid division scheme (i.e., the preliminary grid division scheme) is obtained under which the sound wave transceiver devices are arranged at equal intervals of 2.5 m around the square test area: maxN = {n×n, N≠K(m-1)}, where n×n is the grid division scheme, and m is the number of sound wave transceivers on one side.

[0071] Furthermore, the first area to be tested is expanded in the longitudinal direction to obtain a second area to be tested.

[0072] In order to further optimize the layout of the sound wave transceiver in the narrow and long area to be tested, the area to be tested can be expanded for research based on the optimal grid division scheme of the square area to be tested. Specifically, the square area to be tested at the tunnel ceiling is first expanded longitudinally to become a rectangular area to be tested (the second area to be tested).

[0073] Furthermore, the preliminary grid division scheme is optimized to obtain a second grid division scheme, including:

[0074] Based on the requirement of grid uniformity, the preliminary grid division scheme is optimized to maxN={n1×n2, n1≠k1(m1-1), n2≠k2(m2-1)}, and the second grid division scheme is obtained;

[0075] Where m1 is the number of acoustic wave transceivers in the longitudinal direction of the tunnel, m2 is the number of acoustic wave transceivers in the transverse direction of the tunnel, maxN is the number of optimized grids, n1 is the grid division in the longitudinal direction of the tunnel, n2 is the grid division in the transverse direction of the tunnel, and k1 and k2 are positive integers respectively.

[0076] Specifically, the temperature field of the acoustic CT temperature measurement technology is reconstructed according to the arrangement of the acoustic wave transceiver in the square area to be measured, and it is verified whether the reconstruction error under the preliminary grid division scheme is within the limit and whether it can meet the engineering accuracy requirements. If the engineering accuracy requirements are not met, the number of acoustic wave transceivers needs to be further increased, and b1=b2, b1 is the spacing between two adjacent acoustic wave transceivers in the longitudinal direction of the tunnel, and b2 is the spacing between two adjacent acoustic wave transceivers in the transverse direction of the tunnel. Accordingly, due to the requirement of grid uniformity, the preliminary grid division scheme is further optimized to (second grid division scheme): maxN={n1×n2, n1≠k1(m1-1), n2≠k2(m2-1)}, m1 is the number of acoustic wave transceivers in the longitudinal direction of the tunnel, and m2 is the number of acoustic wave transceivers in the transverse direction of the tunnel.

[0077] Furthermore, after obtaining the second grid division scheme, the number of sound wave transceivers is increased, specifically b1=cb2, b1 is the longitudinal spacing of the sound wave transceivers in the tunnel, b2 is the transverse spacing of the sound wave transceivers in the tunnel, and c is a positive integer.

[0078] Specifically, for the arrangement of the acoustic wave transceiver in a given narrow and long area to be tested, the arrangement cost can be considered for the determined arrangement of the acoustic wave transceiver on the basis of b1=b2 and the feasibility and practical significance of the optimization scheme, and the arrangement of the acoustic wave transceiver can be further optimized. At this time, if N is not too small, the more feasible arrangement of the acoustic wave transceiver is b1=cb2, where b1 is the longitudinal spacing of the acoustic wave transceiver in the tunnel, b2 is the transverse spacing of the acoustic wave transceiver in the tunnel, and c is a positive integer.

[0079] Furthermore, the optimization scheme is:

[0080] Based on the arrangement of the acoustic wave transceiver devices in the second test area corresponding to the second grid division scheme, the temperature field reconstruction of the acoustic CT temperature measurement technology is performed to obtain a second reconstruction error. If the second reconstruction error is within a preset range, the arrangement scheme of the acoustic wave transceiver devices with the least number of acoustic wave transceivers and the corresponding optimal grid division are selected.

[0081] By using the feasible b1=cb2 acoustic wave transceiver arrangement scheme, the acoustic wave transceiver arrangement in the second test area corresponding to the second grid division scheme is used to reconstruct the temperature field of the test area of ​​acoustic CT. When E<5%, ε ave <5%,ε max When <15% are all satisfied, the acoustic wave transceiver device arrangement scheme with the least number of acoustic wave transceiver devices and the corresponding optimal grid division are the optimization methods for the spatial arrangement scheme of the acoustic wave transceiver devices to be sought.

[0082] The present invention can arrange the sound wave transceiver device solution that best meets the economic and engineering accuracy requirements for different tunnels, effectively helping to monitor the occurrence of tunnel fires in real time, determine the location of the fire source, and carry out fire rescue.

[0083] In order to more clearly express the technical solution of the present invention, the following specific embodiments are provided to introduce the solution:

[0084] like Figure 3 As shown in the figure, a full-size model tunnel with a length of 130m, a width of 10m, a height of 5m, a rectangular cross-section and a fire source located 30 meters away from the center line of the tunnel entrance was constructed. The plane at 4.83m from the tunnel ceiling was selected for verification. The optimal arrangement scheme of the acoustic wave transceiver in the constructed tunnel is b1=4b2, and the corresponding optimal grid division scheme is N=64×5.

[0085] Firstly, the tunnel was verified to determine the adaptability of the original temperature obtained by FDS numerical simulation, and the temperature data when the fire source power was 3MW was selected to optimize the spatial layout scheme system of the acoustic wave transceiver.

[0086] A square plane with tunnel width B as the side length is selected for analysis. The acoustic wave transceivers are arranged at an interval of 2.5m from the plane vertex, forming 80 effective acoustic wave paths. According to the principle of acoustic CT, the measured area N<M, and there are 5 corresponding grid division schemes: 4×4, 5×5, 6×6, 7×7 and 8×8.

[0087] According to the comparison between the image reconstructed by the acoustic CT temperature measurement technology and the real fire image, and verified by the specific error value, the corresponding grid division scheme is:

[0088] maxN={n×n,N≠c(m-1)}

[0089] Among them, n×n is the grid division scheme, and m is the number of sound wave transceiver devices on one side.

[0090] At this time, the layout and grid division of the acoustic wave transceiver device minimizes the corresponding error during real-time detection of tunnel fires, thus achieving timely and effective monitoring of fires.

[0091] Secondly, in order to further optimize the arrangement of the sound wave transceiver in the narrow tunnel, the square plane of the tunnel ceiling is first doubled in the longitudinal direction to 2B, which is then converted into a rectangular plane.

[0092] The temperature field of acoustic CT temperature measurement technology is reconstructed according to the original number of sound wave transceivers to verify whether the reconstruction effect under the optimal grid meets the engineering accuracy requirements.

[0093] It can be found that the original arrangement of the sound wave transceiver does not meet the engineering accuracy requirements, and the number of sound wave transceivers needs to be further increased. b1=b2, b1 is the longitudinal spacing of the sound wave transceivers in the tunnel, and b2 is the transverse spacing of the sound wave transceivers in the tunnel.

[0094] Correspondingly, due to the requirement of grid uniformity, the grid division scheme is further optimized to maxN={n1×n2, n1≠k1(m1-1), n2≠k2(m2-1)}, where m1 is the number of longitudinal sound wave transceivers in the tunnel, and m2 is the number of transverse sound wave transceivers in the tunnel.

[0095] Based on the comparison between the image reconstructed by acoustic CT monitoring technology and the real image of the fire, and verified by specific error values, it is necessary to add sound wave transceivers when the plane is expanded.

[0096] For the tunnel in this example, combined with the requirements of fire monitoring accuracy and economy, there is a determined layout scheme of the acoustic wave transceiver, which has high engineering accuracy. Taking into account the cost of arranging the acoustic wave transceiver in the entire tunnel, the layout scheme of the acoustic wave transceiver is further optimized. There are three optimized layout schemes of the acoustic wave transceiver: b1=2b2, b1=3b2, and b1=4b2. Figure 4 The reconstruction temperature comparison diagrams of the three schemes are given, and it can be concluded that the acoustic wave transceiver with b1=4b2 can well meet the engineering accuracy requirements.

[0097] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for optimizing the spatial arrangement of an acoustic wave transceiver based on acoustic CT, characterized in that: include: Arrange an acoustic wave transceiver in the target tunnel area based on the acoustic CT principle to obtain an effective acoustic wave path passing through the target tunnel area; Selecting a first area to be measured within the target tunnel area, dividing the area to be measured into grids with different spacings, calculating and reconstructing temperature data based on different grid division results, performing error comparison between the different reconstructed temperature data and standard temperature data, and obtaining a preliminary grid division scheme based on the comparison results; The first area to be measured is expanded to obtain a second area to be measured, and the temperature field of the acoustic CT temperature measurement technology is reconstructed based on the arrangement of the acoustic wave transceiver device in the second area to be measured corresponding to the preliminary grid division scheme to obtain a first reconstruction error, and verify whether the reconstruction error is within a preset range. If it is within the preset range, the preliminary grid division scheme is output, and if it exceeds the preset range, the preliminary grid division scheme is optimized to obtain a second grid division scheme; The arrangement scheme of the acoustic wave transceiver device corresponding to the second grid division scheme is optimized to determine an optimization scheme.

2. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 1, characterized in that: Obtaining an effective sound wave path through the target tunnel area, including: According to the acoustic CT principle, a certain number of sound wave transceivers are evenly arranged around the target tunnel area, and these sound wave transceivers are connected in pairs to form a number of sound wave paths. Without considering that the connecting lines are located on the boundary surface of the target tunnel area, M effective sound wave paths that pass through the target tunnel area are formed, and the target tunnel area is divided into N grids, where N<M.

3. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 1, characterized in that: The first test area is a square test area with a side length of B and a preset distance from the tunnel ceiling. The standard temperature data is the temperature data obtained in the tunnel fire experiment of the first test area. The reconstructed temperature data is the temperature data reconstructed by acoustic CT temperature measurement technology.

4. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 3 is characterized in that: Comparing the errors of the different reconstructed temperature data with the standard temperature data, and obtaining a preliminary grid division scheme based on the comparison results, including: Comparing the reconstructed temperature data with the standard temperature data receipt image, and verifying through specific error limits, to obtain the preliminary grid division scheme; The preliminary grid division scheme is: maxN={n×n, N≠K(m-1)}, n×n is the grid division scheme, m is the number of acoustic wave transceiver devices on one side, N is the number of divided grids, and K is a positive integer; The specific error limit is: the root mean square percentage error and the average temperature relative error between the reconstructed temperature data and the standard temperature data are both less than a first threshold, and the maximum temperature relative error is less than a second threshold.

5. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 4, characterized in that: The method for calculating the root mean square percentage error is: Where E is the root mean square percentage error, T Mmave is the average temperature of the basic temperature field, m is the total number of grids divided into the measured area, T M(i) is the original temperature of the center point of the i-th grid, T c(i) is the reconstructed temperature of the i-th grid center point; The method for calculating the relative error of the average temperature is: In the formula, ε ave is the average temperature relative error, T Cave is the average temperature of the reconstructed temperature field, T Mave is the average temperature of the basic temperature field.

6. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 4, characterized in that: The method for calculating the maximum temperature relative error is: In the formula, ε max is the maximum temperature relative error, T Cmax is the highest temperature value of the reconstructed temperature field, T Mmax is the highest temperature value of the original temperature field.

7. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 1, characterized in that: The first area to be tested is expanded in the longitudinal direction to obtain the second area to be tested.

8. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 7, characterized in that: Optimizing the preliminary grid division scheme to obtain a second grid division scheme includes: Based on the requirement of grid uniformity, the preliminary grid division scheme is optimized to maxN={n1×n2, n1≠k1(m1-1), n2≠k2(m2-1)}, and the second grid division scheme is obtained; Where m1 is the number of acoustic wave transceivers in the longitudinal direction of the tunnel, m2 is the number of acoustic wave transceivers in the transverse direction of the tunnel, maxN is the number of optimized grids, n1 is the grid division in the longitudinal direction of the tunnel, n2 is the grid division in the transverse direction of the tunnel, and k1 and k2 are positive integers respectively.

9. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 8, characterized in that: After obtaining the second grid division scheme, the method also includes increasing the number of sound wave transceivers, specifically b1=cb2, where b1 is the longitudinal spacing of the sound wave transceivers in the tunnel, b2 is the transverse spacing of the sound wave transceivers in the tunnel, and c is a positive integer.

10. The method for optimizing the spatial arrangement of the acoustic wave transceiver device based on acoustic CT according to claim 9, characterized in that: The optimization scheme is: Based on the arrangement of the acoustic wave transceiver devices in the second test area corresponding to the second grid division scheme, the temperature field reconstruction of the acoustic CT temperature measurement technology is performed to obtain a second reconstruction error. If the second reconstruction error is within a preset range, the arrangement scheme of the acoustic wave transceiver devices with the least number of acoustic wave transceiver devices and the corresponding optimal grid division are selected.

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