Road collapse monitoring method and system by multiplexing existing communication optical cable

Abstract

The invention relates to a road collapse monitoring method and system by multiplexing an existing communication optical cable, the method comprises the steps of data acquisition and processing, conversion relation acquisition, mapping relation construction and road collapse monitoring, the system comprises a communication optical cable, a junction box, a distributed optical fiber demodulation device and a computing terminal, the computing terminal is used for implementing the method. Compared with the prior art, the method has the advantages of wide monitoring range, low monitoring cost, high real-time performance, high accuracy and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of highway engineering, and in particular to a highway collapse monitoring method and system for multiplexing existing communication optical cables. Background Art

[0002] Highway collapse monitoring is an important means to ensure traffic safety. Traditional monitoring methods include manual inspections and the use of various sensor technologies, such as the Global Positioning System (GPS) and ground penetrating radar. Although these methods can provide accurate monitoring data, they have problems such as high cost, low efficiency, and poor real-time performance. At present, fiber optic sensing technology has been widely used in the field of structural health monitoring due to its long-term stability and corrosion resistance. The distributed fiber optic acoustic sensing system (DAS) can use existing communication optical cables to detect underground cavities and cracks by monitoring the acoustic signals along the optical cables, thereby achieving early warning of highway collapse. However, existing fiber optic sensing monitoring systems usually require special optical cables and equipment, and have high installation and maintenance costs.

[0003] Although fiber optic sensing technology has significant advantages in structural health monitoring, the following problems still exist in highway collapse monitoring: high installation and maintenance costs, requiring specialized optical cables and equipment; low coverage of the monitoring system, which can only cover certain sections of the road with higher safety requirements and cannot cover the entire area; and the real-time and accuracy of monitoring data in complex environments needs to be improved.

[0004] Therefore, providing a method with low cost, wide coverage, high real-time performance and high accuracy is a problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a highway collapse monitoring method and system that reuses existing communication optical cables.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a method for monitoring highway collapse by reusing an existing communication optical cable, the method comprising:

[0008] Data collection and processing: collect one or more optical fiber signals of the existing communication optical cable of the target highway in real time, and analyze the optical fiber signals to obtain the vibration information, temperature information, strain information of the optical fiber distribution and the corresponding one-dimensional coordinate information of the optical fiber; pre-process the vibration information and strain information using temperature, and the pre-processed vibration information and strain information constitute diagnostic data;

[0009] Acquiring the conversion relationship: acquiring the highway pile information of the target road section and combining it with the one-dimensional optical fiber coordinate information to obtain the conversion relationship between the one-dimensional optical fiber coordinate and the highway pile information; the highway pile information includes the highway pile number and the corresponding highway pile position information;

[0010] Mapping relationship construction: construct the mapping relationship between highway collapse type and collapse degree and diagnostic data;

[0011] Highway collapse monitoring: Based on the optical fiber signal collected in real time, a highway collapse monitoring result is generated based on the conversion relationship or a combination of the conversion relationship and the mapping relationship. The collapse result includes the collapse type, collapse degree and location information of the collapse.

[0012] As a preferred technical solution, the optical fiber signal acquisition method is:

[0013] Connect the existing communication optical cable, reserve connection ports and number them;

[0014] The existing communication optical cables with numbers are connected to multiple distributed optical fiber demodulation devices according to preset rules, and the distributed optical fiber demodulation devices are used to collect optical fiber signals.

[0015] As a preferred technical solution, the preset rules are:

[0016] If the distributed optical fiber demodulation device used does not require double-end connection, the connection ports with odd numbers are connected to the distributed optical fiber demodulation device, and the connection ports with even numbers are used as reserved ports;

[0017] If the distributed optical fiber demodulation device used requires a double-end connection, the even-numbered connection ports are connected to the distributed optical fiber demodulation device, and the tail ends of the optical fibers corresponding to the even-numbered connection ports with adjacent numbers are fused;

[0018] If the number of the i-th (1≤i≤N) connection port is an odd number and the type of distributed optical fiber demodulation equipment used is a non-optical time domain reflectometer, the tail ends of the optical fibers corresponding to the i-th and i+1-th connection ports are fused, where N represents the total number of connection ports.

[0019] As a preferred technical solution, the sampling frequency for collecting the vibration information is greater than or equal to 500 Hz, and the sampling frequency for collecting the temperature information and strain information is greater than or equal to 0.1 Hz.

[0020] As a preferred technical solution, the preprocessing method is to perform temperature compensation and correction on vibration information and strain information based on temperature information.

[0021] As a preferred technical solution, the detailed steps of obtaining the conversion relationship include:

[0022] Collect the time data of the continuous impact load of the mobile vehicle on the target road section and the positioning information of the vehicle;

[0023] Obtain the optical fiber vibration signal during the impact load process and extract the vibration peak value generated by each impact load;

[0024] The vibration peak is used to locate the one-dimensional coordinates of the optical fiber of the target road section, and the conversion relationship between the one-dimensional coordinates of the optical fiber and the highway stake number in the target road section is established by combining the positioning information and the highway stake information.

[0025] As a preferred technical solution, the detailed process of constructing the mapping relationship includes:

[0026] Construct a simulation model of the target road section, simulate typical collapse conditions of the target road section, and obtain diagnostic data under corresponding collapse conditions;

[0027] Based on the diagnostic data, the mapping relationship between highway collapse type and collapse degree and diagnostic data is constructed.

[0028] As a preferred technical solution, the mapping relationship includes:

[0029] When the fluctuation of the signal segment corresponding to the vibration information exceeds the first preset amplitude, and the signal segment corresponding to the strain information fluctuates within the preset amplitude range and then returns to stability, the mapped collapse type is landslide collapse; the fluctuation amplitude of the signal segment corresponding to the vibration information maps the degree of landslide collapse;

[0030] When the fluctuation time of the signal segment corresponding to the vibration information exceeds the first preset time, and the signal segment corresponding to the strain information generates oscillation and the offset duration exceeds the second preset time, the mapped collapse type is slope collapse; the fluctuation amplitude of the signal segment corresponding to the vibration information and the offset degree of the signal segment corresponding to the strain information map the degree of slope collapse;

[0031] When the signal segment corresponding to the vibration information fluctuates beyond the second preset amplitude in a very short time, and the signal segment corresponding to the strain information fluctuates beyond the third preset amplitude and produces an offset beyond the allowable range, the mapped collapse type is roadbed collapse; the fluctuation amplitude of the signal segment corresponding to the vibration information and the offset degree of the signal segment corresponding to the strain information map the degree of roadbed collapse.

[0032] As a preferred technical solution, the method for monitoring highway collapse includes:

[0033] If the optical fiber signal is interrupted and does not recover autonomously within the third preset time, the collapse degree and type of the target road section are determined to be the overall collapse of the roadbed, and the location information of the collapse is obtained by combining the conversion relationship between the optical fiber one-dimensional coordinates corresponding to the target road section and the highway pile information to generate the highway collapse monitoring result;

[0034] If the optical fiber signal is not interrupted, but the signal attenuation exceeds the preset range, the collapse degree and type of the target road section are determined to be the overall collapse or deformation of the roadbed. The location information of the collapse is obtained by combining the conversion relationship between the one-dimensional coordinates of the optical fiber corresponding to the target road section and the highway pile information, and the highway collapse monitoring results are generated;

[0035] If the optical fiber signal undergoes a sudden change beyond a preset degree, the degree and type of collapse are determined based on the diagnostic data using the mapping relationship corresponding to the target road section, and the location information of the collapse is obtained by combining the conversion relationship between the one-dimensional coordinates of the optical fiber corresponding to the target road section and the highway pile information to generate a highway collapse monitoring result.

[0036] According to a second aspect of the present invention, there is provided a highway collapse monitoring system that reuses existing communication optical cables, including existing communication optical cables, junction boxes, distributed optical fiber demodulation equipment and computing terminals, wherein the computing terminals are used to implement the above method.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1) High monitoring coverage and low monitoring cost: By reusing the existing communication optical cables inside the highway infrastructure, there is no need to lay additional dedicated monitoring optical cables, which can not only achieve full road coverage but also avoid additional installation and maintenance costs;

[0039] 2) High real-time performance: The distributed optical fiber demodulation equipment can demodulate the optical fiber signal collected in real time, and obtain the vibration, temperature, strain and other information distributed along the optical fiber in real time, ensuring the real-time performance of the monitoring data;

[0040] 3) High accuracy: Temperature is used to compensate and correct vibration and strain information, eliminating measurement errors caused by temperature, enhancing the reliability and accuracy of data, thereby improving the accuracy of collapse monitoring;

[0041] 4) Easy to implement and maintain: The system provided by the present invention utilizes existing communication optical cables to monitor highway collapse, reducing construction difficulty and maintenance workload; and the method of collecting data is simple, easy to understand and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of the method of the present invention;

[0043] Figure 2 A flow chart of obtaining a conversion relationship of the present invention;

[0044] Figure 3 A flowchart of constructing a mapping relationship of the present invention;

[0045] Figure 4It is a system structure diagram of the present invention.

[0046] Reference numerals:

[0047] 1-highway, 2-existing communication optical cable, 3-junction box, 4-connection port, 5-distributed optical fiber demodulation equipment, 6-computing terminal. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0050] Example 1

[0051] In view of the shortcomings of the prior art, this embodiment provides a highway collapse monitoring method that reuses the existing communication optical cable 2. The method utilizes the existing communication optical cable 2 buried inside the current highway infrastructure and combines it with the cutting-edge distributed optical fiber sensing technology to achieve full-road collapse monitoring. The process of the method is as follows: Figure 1 As shown, the following steps are included:

[0052] S1. Data collection and processing: collect one or more optical fiber signals of the existing communication optical cable 2 of the target highway in real time and process them.

[0053] S11. Connect the existing communication optical cable 2 installed at the lower part of the central dividing strip or the outer side of the roadway, reserve the connection port 4 and number it.

[0054] S12, connect the existing communication optical cables with numbers to multiple distributed optical fiber demodulation devices 5, and use the distributed optical fiber demodulation devices 5 to collect optical fiber signals, wherein the distributed optical fiber demodulation devices 5 can use BOTDA, BOTDR and One or more of .

[0055] When connecting the optical cable to the distributed optical fiber demodulation device 5, pay attention to the following three situations:

[0056] a. If the distributed optical fiber demodulation device 5 does not require a double-ended connection, the odd-numbered connection ports are connected to the distributed optical fiber demodulation device 5, and the even-numbered connection ports are used as reserved ports;

[0057] b. If the distributed optical fiber demodulation device 5 used requires a double-ended connection, the even-numbered connection ports are connected to the distributed optical fiber demodulation device 5, and the tail ends of the optical fibers corresponding to the adjacent odd-numbered connection ports and even-numbered connection ports are fused;

[0058] c. If the number of the i-th (1≤i≤N) connection port is an odd number, and the type of the distributed optical fiber demodulation device 5 used is a distributed optical fiber demodulation device other than OTDR (optical time domain reflectometer), the tail ends of the optical fibers corresponding to the i-th and i+1-th connection ports are fused, where N represents the total number of connection ports.

[0059] S13. Analyze the collected optical fiber signal to obtain vibration information, temperature information, strain information of the optical fiber distribution and the corresponding one-dimensional coordinate information of the optical fiber, wherein the sampling frequency for collecting vibration information is greater than or equal to 500 Hz, and the sampling frequency for collecting temperature information and strain information is greater than or equal to 0.1 Hz.

[0060] S14. Compensating and correcting the vibration information and strain information using temperature. The compensated and corrected vibration information and strain information constitute diagnostic data.

[0061] S2, conversion relationship acquisition: obtain the target road section highway pile information and combine it with the optical fiber one-dimensional coordinate information to obtain the conversion relationship between the optical fiber one-dimensional coordinate and the highway pile information. The process is as follows: Figure 2 As shown, the detailed steps include:

[0062] S21. Collect the time data of the mobile vehicle's continuous impact load on the target road section and the Beidou / GPS positioning information of the vehicle.

[0063] S22, obtaining the optical fiber vibration signal during the impact load process, and using the vibration energy peak value extraction method according to the vibration information to extract the vibration peak value generated by each impact load.

[0064] S23, using the vibration peak to locate the one-dimensional coordinates of the optical fiber of the target road section, and combining the positioning information with the highway pile information to establish a conversion relationship between the one-dimensional coordinates of the optical fiber and the highway pile number in the target road section, wherein the highway pile information includes the highway pile number and the corresponding highway pile position information.

[0065] S3. Mapping relationship construction: Construct the mapping relationship between highway collapse type and collapse degree and diagnostic data. The process is as follows: Figure 3 As shown, the detailed steps include:

[0066] S31. Construct a finite element simulation model of the target road section based on the roadbed-slope configuration of the road section to be monitored (eg, high fill roadbed, half-fill and half-excavation roadbed, road cutting, etc.).

[0067] S32, simulating a typical collapse condition of a target road section, and obtaining diagnostic data corresponding to the collapse condition;

[0068] S33. Constructing a mapping relationship between the highway collapse type and collapse degree and the diagnostic data based on the diagnostic data.

[0069] Specifically, the mapping relationship includes the following three categories:

[0070] i. Landslide and collapse: When the fluctuation of the signal segment corresponding to the vibration information exceeds the first preset amplitude, and the signal segment corresponding to the strain information fluctuates within the preset amplitude range and then returns to stability; the fluctuation amplitude of the signal segment corresponding to the vibration information maps the degree of landslide and collapse;

[0071] ii. Slope collapse: When the fluctuation time of the signal segment corresponding to the vibration information exceeds the first preset time, and the signal segment corresponding to the strain information generates oscillation and the offset duration exceeds the second preset time; the fluctuation amplitude of the signal segment corresponding to the vibration information and the offset degree of the signal segment corresponding to the strain information map the degree of slope collapse;

[0072] iii. Roadbed collapse: When the signal segment corresponding to the vibration information fluctuates beyond the second preset amplitude in a very short time, and the signal segment corresponding to the strain information fluctuates beyond the third preset amplitude and produces an offset beyond the allowable range; the fluctuation amplitude of the signal segment corresponding to the vibration information and the offset degree of the signal segment corresponding to the strain information map the degree of roadbed collapse.

[0073] S4. Highway collapse monitoring: Based on the optical fiber signal collected in real time, the highway collapse monitoring result is generated based on the conversion relationship or in combination with the conversion relationship and the mapping relationship. The collapse result includes the collapse type, collapse degree and location information of the collapse.

[0074] If the optical fiber signal is interrupted and does not recover autonomously within the third preset time, the collapse degree and type of the target road section are determined to be the overall collapse of the roadbed, and the location information of the collapse is obtained by combining the conversion relationship between the optical fiber one-dimensional coordinates corresponding to the target road section and the highway pile information to generate the highway collapse monitoring result;

[0075] If the optical fiber signal is not interrupted, but the signal attenuation exceeds the preset range, the collapse degree and type of the target road section are determined to be the overall collapse or deformation of the roadbed. The location information of the collapse is obtained by combining the conversion relationship between the one-dimensional coordinates of the optical fiber corresponding to the target road section and the highway pile information, and the highway collapse monitoring results are generated;

[0076] If the optical fiber signal undergoes a sudden change beyond a preset degree, the degree and type of collapse are determined based on the diagnostic data using the mapping relationship corresponding to the target road section, and the location information of the collapse is obtained by combining the conversion relationship between the one-dimensional coordinates of the optical fiber corresponding to the target road section and the highway pile information to generate a highway collapse monitoring result.

[0077] Example 2

[0078] The above is an introduction to the method embodiment. The following is a further explanation of the solution of the present invention through a system embodiment. Figure 4 As shown, the system includes: a highway 1, an existing communication optical cable 2, a junction box 3, a connection port 4, a distributed optical fiber demodulation device 5 and a computing terminal 6, wherein the computer terminal 6 is used to implement the method provided in the above embodiment.

[0079] In the system provided in this embodiment, the existing communication optical cable 2 is connected to the redundant optical fiber laid in the highway 1 through the junction box 3, and then connected to one or more distributed optical fiber demodulation devices 5 through multiple optical ports 4. The distributed optical fiber demodulation device 5 converts the optical signal into physical quantities such as strain, temperature, and vibration, and then transmits the data to the computing terminal 6. The computing terminal uses the monitoring method provided in the above embodiment to perform calculations to obtain highway collapse monitoring results.

[0080] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0081] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A highway collapse monitoring method for multiplexing existing communication optical cables, characterized in that: The method includes: Data collection and processing: real-time collection of one or more optical fiber signals of an existing communication optical cable (2) on the target highway, and analysis of the optical fiber signals to obtain vibration information, temperature information, strain information of the optical fiber distribution and corresponding one-dimensional coordinate information of the optical fiber; pre-processing the vibration information and strain information using temperature, and the pre-processed vibration information and strain information constitute diagnostic data; Acquiring the conversion relationship: acquiring the highway pile information of the target road section and combining it with the one-dimensional optical fiber coordinate information to obtain the conversion relationship between the one-dimensional optical fiber coordinate and the highway pile information; the highway pile information includes the highway pile number and the corresponding highway pile position information; Mapping relationship construction: construct the mapping relationship between highway collapse type and collapse degree and diagnostic data; Highway collapse monitoring: Based on the optical fiber signal collected in real time, a highway collapse monitoring result is generated based on the conversion relationship or based on the conversion relationship and the mapping relationship. The collapse result includes the collapse type, collapse degree and location information of the collapse.

2. A highway collapse monitoring method for reusing existing communication optical cables according to claim 1, characterized in that: The optical fiber signal acquisition method is as follows: Connect the existing communication optical cable (2), reserve connection ports (4) and number them; The existing communication optical cables with numbers are connected to a plurality of distributed optical fiber demodulation devices (5) according to a preset rule, and the distributed optical fiber demodulation devices (5) are used to collect optical fiber signals.

3. A highway collapse monitoring method for reusing existing communication optical cables according to claim 2, characterized in that: The preset rules are: If the used distributed optical fiber demodulation device (5) does not require a double-end connection, the odd-numbered connection ports are connected to the distributed optical fiber demodulation device (5), and the even-numbered connection ports are used as reserved ports; If the used distributed optical fiber demodulation device (5) requires a double-end connection, the even-numbered connection ports are connected to the distributed optical fiber demodulation device (5), and the tail ends of the optical fibers corresponding to the adjacent odd-numbered connection ports and the even-numbered connection ports are fused; If the number of the i-th (1≤i≤N) connection port is an odd number and the type of the distributed optical fiber demodulation device (5) used is a non-optical time domain reflectometer, the tail ends of the optical fibers corresponding to the i-th and i+1-th connection ports are fused, where N represents the total number of connection ports.

4. A highway collapse monitoring method for reusing existing communication optical cables according to claim 2, characterized in that: The sampling frequency for collecting the vibration information is greater than or equal to 500 Hz, and the sampling frequency for collecting the temperature information and strain information is greater than or equal to 0.1 Hz.

5. The highway collapse monitoring method for reusing existing communication optical cables according to claim 1, characterized in that: The preprocessing method is to perform temperature compensation and correction on vibration information and strain information based on temperature information.

6. A highway collapse monitoring method for reusing existing communication optical cables according to claim 1, characterized in that: The detailed steps of obtaining the conversion relationship include: Collect the time data of the continuous impact load of the mobile vehicle on the target road section and the positioning information of the vehicle; Obtain the optical fiber vibration signal during the impact load process and extract the vibration peak value generated by each impact load; The vibration peak is used to locate the one-dimensional coordinates of the optical fiber of the target road section, and the conversion relationship between the one-dimensional coordinates of the optical fiber and the highway stake number in the target road section is established by combining the positioning information and the highway stake information.

7. A highway collapse monitoring method for reusing existing communication optical cables according to claim 1, characterized in that: The detailed process of constructing the mapping relationship includes: Construct a simulation model of the target road section, simulate typical collapse conditions of the target road section, and obtain diagnostic data under corresponding collapse conditions; Based on the diagnostic data, the mapping relationship between highway collapse type and collapse degree and diagnostic data is constructed.

8. A highway collapse monitoring method for reusing existing communication optical cables according to claim 7, characterized in that: The mapping relationship includes: When the fluctuation of the signal segment corresponding to the vibration information exceeds the first preset amplitude, and the signal segment corresponding to the strain information fluctuates within the preset amplitude range and then returns to stability, the mapped collapse type is landslide collapse; the fluctuation amplitude of the signal segment corresponding to the vibration information maps the degree of landslide collapse; When the fluctuation time of the signal segment corresponding to the vibration information exceeds the first preset time, and the signal segment corresponding to the strain information generates oscillation and the offset duration exceeds the second preset time, the mapped collapse type is slope collapse; the fluctuation amplitude of the signal segment corresponding to the vibration information and the offset degree of the signal segment corresponding to the strain information map the degree of slope collapse; When the signal segment corresponding to the vibration information fluctuates beyond the second preset amplitude in a very short time, and the signal segment corresponding to the strain information fluctuates beyond the third preset amplitude and produces an offset beyond the allowable range, the mapped collapse type is roadbed collapse; the fluctuation amplitude of the signal segment corresponding to the vibration information and the offset degree of the signal segment corresponding to the strain information map the degree of roadbed collapse.

9. The highway collapse monitoring method for reusing existing communication optical cables according to claim 1, characterized in that: The method for monitoring highway collapse comprises: If the optical fiber signal is interrupted and does not recover autonomously within the third preset time, the collapse degree and type of the target road section are determined to be the overall collapse of the roadbed, and the location information of the collapse is obtained by combining the conversion relationship between the optical fiber one-dimensional coordinates corresponding to the target road section and the highway pile information to generate the highway collapse monitoring result; If the optical fiber signal is not interrupted, but the signal attenuation exceeds the preset range, the collapse degree and type of the target road section are determined to be the overall collapse or deformation of the roadbed. The location information of the collapse is obtained by combining the conversion relationship between the one-dimensional coordinates of the optical fiber corresponding to the target road section and the highway pile information, and the highway collapse monitoring results are generated; If the optical fiber signal undergoes a sudden change beyond a preset degree, the degree and type of collapse are determined based on the diagnostic data using the mapping relationship corresponding to the target road section, and the location information of the collapse is obtained by combining the conversion relationship between the one-dimensional coordinates of the optical fiber corresponding to the target road section and the highway pile information to generate a highway collapse monitoring result.

10. A highway collapse monitoring system that reuses existing communication optical cables, comprising an existing communication optical cable (2), a junction box (3), a distributed optical fiber demodulation device (5) and a computing terminal (6), characterized in that: The computing terminal is used to implement the method described in any one of claims 1 to 9.

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