Measuring device for monitoring strain and attitude of road surface

Abstract

The utility model discloses a measuring device for monitoring pavement strain and posture, and belongs to the technical field of civil structure health monitoring. In order to solve the problems that a large amount of cost needs to be invested because a large number of sensing elements need to be buried on a road surface and corresponding power supply and acquisition equipment needs to be matched in an existing road surface strain and attitude measuring device, and a large number of buried sensing elements can damage an original road surface structure, so that the original road surface structure is easy to damage and the road use performance is reduced, the utility model provides the road surface strain and attitude measuring device. The multi-parameter sensing device comprises a plurality of multi-parameter sensing units which are arranged side by side along the width direction of a road surface, wherein the plurality of multi-parameter sensing units are connected in series; each multi-parameter sensing unit comprises a high-strength optical fiber and a plurality of attitude sensing modules arranged on the high-strength optical fiber along the length direction of the high-strength optical fiber; the high-strength optical fibers are arranged in the length direction of the road surface, and every two adjacent high-strength optical fibers are connected in an optical fiber welding mode. The device is mainly used for measuring the strain and attitude of the road surface.

Description

Technical Field

[0001] The utility model belongs to the technical field of civil structure health monitoring, and in particular relates to a measuring device for monitoring road surface strain and posture. Background Art

[0002] At present, my country's highway mileage ranks first in the world. However, the failure to discover and deal with highway diseases in time has led to a sharp increase in the cost of highway maintenance in the later stage. Road monitoring is an important way to discover diseases and provide timely maintenance decisions. In areas such as the three northeastern provinces, Inner Mongolia, Xinjiang, Ningxia and Tibet, asphalt pavements often crack in winter due to the low temperature in winter. In the rainy season in summer, rainwater penetrates into the structure along the cracks, and under the action of external loads, water damage occurs early inside the pavement, greatly increasing the maintenance cost. In addition, in southern my country, the summer is hot, and under the influence of solar radiation, the road surface temperature can reach 70-80℃ in summer. Under such high temperature conditions, due to the viscoelastic characteristics of asphalt materials, under the action of external loads, the road surface also has serious rutting, affecting driving safety and comfort, and also requires timely preventive monitoring and maintenance. Among many monitoring technologies, optical fiber sensing has been widely used in civil engineering, aerospace, petrochemical, electric power, medical, shipbuilding and other fields due to its advantages of anti-electromagnetic interference, corrosion resistance, high insulation, wide measurement range, and easy multiplexing into a network. Among them, distributed optical fiber sensors are increasingly used due to their continuous spatial resolution. It is only necessary to bury an ordinary optical cable inside the road to measure the strain at each point of the optical cable.

[0003] However, there are many existing monitoring directions and monitoring methods, such as vibration monitoring (load), strain monitoring (fatigue, cracks), posture monitoring (rutting), etc., but one monitoring element can only monitor one physical quantity. If you want to obtain multi-model information of the pavement structure, you need to bury a large number of sensor elements and match them with corresponding power supply and collection equipment. This process requires a lot of cost, and burying a large number of sensor elements will destroy the original pavement structure and make it more prone to disease. At the same time, the road performance will also be reduced (stiffness will increase). Therefore, developing a sensing component that can measure multi-parameter information of the pavement in real time is an urgent problem that technicians in this field need to solve. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a measuring device for monitoring road surface strain and posture. Based on high-strength optical fiber and MEMS chip, it can realize the measurement of strain information, three-dimensional vibration acceleration, three-dimensional posture and three-dimensional magnetic field, and realize the perception of multiple parameters of the road surface.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A measuring device for monitoring road surface strain and posture, comprising a plurality of multi-parameter sensing units and a terminal processing device arranged side by side along the width direction of the road surface, wherein the plurality of multi-parameter sensing units are connected in series;

[0007] Each multi-parameter sensing unit includes a high-strength optical fiber and a plurality of posture sensing modules arranged on the high-strength optical fiber along the length direction of the high-strength optical fiber; the high-strength optical fiber is arranged along the length direction of the road surface, and two adjacent high-strength optical fibers are connected by optical fiber fusion splicing; the signal output end of the high-strength optical fiber and the signal output end of the posture sensing module are connected to the signal receiving end of the terminal processing device.

[0008] Furthermore, each posture sensing module includes a MEMS chip, a power supply battery, a packaging plastic shell and a power cord; the MEMS chip and the power supply battery are installed on the high-strength optical fiber through the packaging plastic shell and are wrapped by the packaging plastic shell; the power supply battery is connected to the MEMS chip through the power cord to power the MEMS chip.

[0009] Furthermore, the MEMS chip includes a three-axis acceleration sensor, a three-axis gyroscope, a three-axis magnetic sensor, a PC and an ADC analog-to-digital conversion chip. The information receiving end of the ADC analog-to-digital conversion chip is respectively connected to the information output ends of the three-axis acceleration sensor, the three-axis gyroscope and the three-axis magnetic sensor. The information output end of the ADC analog-to-digital conversion chip is connected to the information receiving end of the PC through a serial port. The PC receiving end is equipped with a host computer for data collection and storage.

[0010] Furthermore, the MEMS chip also includes a temperature sensor, and an information output terminal of the temperature sensor is connected to an information receiving terminal of the PC.

[0011] Furthermore, the power supply battery is a rechargeable battery with a voltage of 5V.

[0012] Furthermore, the packaging shell is made of a polymer insulator.

[0013] Furthermore, the high-strength optical fiber includes a core, a cladding and an optical fiber protective layer arranged in sequence from the inside to the outside.

[0014] Furthermore, the optical fiber protective layer is a hard rubber sheath with fine steel strands.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. This application uses fiber Bragg grating as the sensing element for strain measurement. Since the optical fiber has good anti-electromagnetic interference performance, in the process of joint monitoring with MEMS chip, the frequency of general electromagnetic radiation is much lower than that of light waves, so the optical signal transmitted in the optical fiber is not affected by electromagnetic interference. This application can realize real-time dynamic monitoring based on high-strength optical fiber and MEMS chip. The real-time monitoring data can reflect strain information, three-dimensional vibration acceleration, three-dimensional posture and three-dimensional magnetic field, and can monitor the internal mechanical response information of the road surface, disease information and external vehicle load information, meeting the needs of foundation settlement monitoring in the field of civil engineering. In addition, the optical fiber transmission loss is small, and long-distance remote control monitoring can be realized. Furthermore, the fiber Bragg grating has good insulation performance, a wide range of applications, and is safe and reliable. The optical fiber itself is composed of electrolytes and does not require power drive.

[0017] 2. The posture sensing module of the present application is provided with a temperature sensor, which can obtain the temperature information of the measurement position in real time to eliminate the measurement error caused by temperature (thermal expansion and contraction) during the real-time measurement of the optical fiber, thereby improving the measurement accuracy.

[0018] 3. In the multi-parameter sensing unit of the present application, the length of the optical fiber and the number of MEMS chips connected in series on the surface can be determined according to the specific monitoring needs, which can realize the measurement of large-scale, multi-point, and continuous three-dimensional space physical quantities. Moreover, the MEMS chip can realize wireless measurement, avoiding redundant lines and damage to the road surface.

[0019] 4. This application can be installed by trenching, backfilling and burial to monitor the built roads or structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] As a part of this application, the accompanying drawings are used to provide a further understanding of the present invention.

[0021] Figure 1 The overall structure of this application is shown in FIG. Figure 1 .

[0022] Figure 2 The overall structure of this application is shown in FIG. Figure 2 .

[0023] Figure 3 This is a schematic diagram of the structure of the electrical connection between the MEMS chip and the power supply battery.

[0024] Figure 4 This is a schematic diagram of the structure of the posture sensing module and the high-strength optical fiber arrangement.

[0025] Figure 5 Schematic diagram of the structure of high-strength optical fiber.

[0026] Figure 6 This is a schematic diagram of the structure of the strain and posture measurement device of this application arranged on the road surface.

[0027] Figure 7 Control relationship diagram for posture perception.

[0028] Figure 8 Schematic diagram of a MEMS chip.

[0029] Explanation of the accompanying drawings: 1-high-strength optical fiber; 1-1-fiber core; 1-2-cladding; 1-3-optical fiber protective layer; 2-gesture sensing module; 2-1-MEMS chip; 2-1-1-three-axis acceleration sensor; 2-1-2-three-axis gyroscope; 2-1-3-three-axis magnetic sensor; 2-1-4-PC; 2-1-5-ADC analog-to-digital conversion chip; 2-1-6-temperature sensor; 2-2-power supply battery; 2-3-packaging shell; 2-4-power cord. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0031] Since the existing road surface strain and posture measurement devices need to bury a large number of sensor elements in the road surface and provide corresponding power supply and data collection equipment, a large amount of cost is required. In addition, burying a large number of sensor elements will damage the original road surface structure, making it more prone to diseases and reducing road performance. Therefore, this embodiment provides a measurement device for monitoring road surface strain and posture.

[0032] See also Figure 1 , Figure 2 and Figure 6 The road surface strain and posture measuring device comprises a plurality of multi-parameter sensing units and a terminal processing device arranged side by side along the road surface width direction, and the plurality of multi-parameter sensing units are connected in series;

[0033] Each multi-parameter sensing unit includes a high-strength optical fiber 1 and a plurality of posture sensing modules 2 arranged on the high-strength optical fiber 1 along the length direction of the high-strength optical fiber 1; the high-strength optical fiber 1 is arranged along the length direction of the road surface, and two adjacent high-strength optical fibers 1 are connected by optical fiber fusion splicing; the signal output end of the high-strength optical fiber 1 and the signal output end of the posture sensing module 2 are connected to the signal receiving end of the terminal processing device.

[0034] This embodiment also includes an optical fiber demodulator and a terminal processing device. The high-strength optical fiber 1 and the posture perception module 2 are two independent sensors; the high-strength optical fiber 1 transmits the measured optical signal to the optical fiber demodulator, and the optical fiber demodulator transmits the demodulated data to the terminal processing device for solution and obtains the road surface strain; and the posture perception module 2 can measure its own posture information and transmit it to the terminal processing device. Through the design and arrangement of multiple posture perception modules 2, the disease characteristics of the road surface can be obtained; therefore, this embodiment can realize the perception of multiple parameters of the road surface through the design of high-strength optical fiber 1 and posture perception module 2. It should be noted that the design and arrangement of the posture perception module 2 and the high-strength optical fiber 1 in this embodiment are the key points of protection of this application, and the solution of data by the optical fiber demodulator and the terminal processing device is not the key point of protection of this application.

[0035] In this embodiment, the length of the high-strength optical fiber 1 can be made according to the monitoring length, and the layout and arrangement of the optical fiber can be adjusted according to the width of the monitored road and the required monitoring density; generally speaking, the optical fiber is often buried under the wheel track. For a road with a width of 3.75 meters, the wheel track spacing is generally considered to be 2m, located in the center of the road, and each wheel track is offset by ±0.5m to the left and right. In addition, in order to achieve signal transmission, the end position of the high-strength optical fiber 1 in this embodiment can be welded by a welding machine with a jumper, and connected to a demodulation device for data acquisition. In addition, considering the actual monitoring range of the sensor, the longitudinal layout spacing of the posture sensing module 2 does not exceed 1m, and the lateral spacing is 3m. The specific actual layout plan can be adjusted according to the on-site conditions.

[0036] Furthermore, in order to achieve the measurement of its own posture, such as Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, each posture sensing module 2 includes a MEMS chip 2-1, a power supply battery 2-2, a packaging plastic shell 2-3 and a power cord 2-4; the MEMS chip 2-1 and the power supply battery 2-2 are installed on the high-strength optical fiber 1 through the packaging plastic shell 2-3 and are wrapped by the packaging plastic shell 2-3; the power supply battery 2-2 is connected to the MEMS chip 2-1 through the power cord 2-4 to power the MEMS chip 2-1.

[0037] Among them, the model of the MEMS chip 2-1 is MPU 9250, which is an integrated component, including a three-axis acceleration sensor 2-1-1, a three-axis gyroscope 2-1-2, a three-axis magnetic sensor 2-1-3, PC2-1-4 and an ADC analog-to-digital conversion chip 2-1-5. The information receiving end of the ADC analog-to-digital conversion chip 2-1-5 is respectively connected to the information output ends of the three-axis acceleration sensor 2-1-1, the three-axis gyroscope 2-1-2 and the three-axis magnetic sensor 2-1-3. The information output end of the ADC analog-to-digital conversion chip 2-1-5 is connected to the information receiving end of PC2-1-4 through a serial port (wired USB or wireless Bluetooth). The PC2-1-4 receiving end is equipped with a host computer for data collection and storage.

[0038] In the specific implementation of this embodiment, since the multi-parameter sensing unit is buried in the road surface, when the vehicle travels on the road surface, vibration and load will inevitably be generated, and transmitted to the MEMS chip 2-1 through the road surface. The vibration acceleration of the road surface can be tested by the three-axis acceleration sensor 2-1-1; in addition, the road surface will produce rutting under the action of cumulative load, and the rutting is attributed to the flow deformation of the asphalt material. The three-axis acceleration sensor 2-1-1, the three-axis gyroscope 2-1-2 and the three-axis magnetic sensor 2-1-3 transmit the measured information to the ADC analog-to-digital conversion chip 2-1-5, and the ADC analog-to-digital conversion chip 2-1-5 transmits the converted data to PC2-1-4 via USB or wireless Bluetooth. PC2-1-4 calculates and processes the sensed digital signal and obtains the posture of the MEMS chip 2-1, which is then wirelessly transmitted to the terminal processing device via Bluetooth 5.0. The terminal processing device can further reconstruct the overall morphological characteristics of the rutting based on the postures of multiple MEMS chips 2-1, so as to quantify the disease characteristics of the road surface.

[0039] In addition, in order to avoid the influence of temperature on the measurement results of high-strength optical fiber 1, Figure 7 As shown, the MEMS chip 2-1 described in this embodiment is also integrated with a temperature sensor 2-1-6, and the information output end of the temperature sensor 2-1-6 is connected to the information receiving end of the PC 2-1-4.

[0040] In this embodiment, since the optical fiber is affected by both temperature and load, the measurement result of the optical fiber will be affected. In this embodiment, the temperature information of the measurement position can be obtained in real time through the setting of the temperature sensor 2-1-6. The temperature sensor 2-1-6 transmits the measured data to the terminal processing device through PC2-1-4. The terminal processing device eliminates the temperature influence based on the measured temperature value to eliminate the measurement error of the optical fiber sensor caused by temperature (thermal expansion and contraction) during the real-time measurement of the optical fiber, thereby improving the measurement accuracy.

[0041] Among them, the power supply battery 2-2 is a rechargeable battery with a voltage of 5V to ensure that the MEMS chip 2-1 can work in real time; the power supply battery 2-2 in each posture sensing module 2 is connected to the power supply end through the main power line.

[0042] In this embodiment, since common roads and other monitoring projects are often located in places with few people, and there is often no direct energy supply in these locations, solar panels can be used as a way to store and supply energy. The appropriate size of the solar panels and the capacity of the rechargeable batteries can be selected according to the actual power supply needs and weather conditions. The battery capacity of the power supply battery 2-2 should meet the power supply needs of the MEMS chip 2-1 for real-time operation under cloudy conditions. The working current of the MEMS chip 2-1 is 15mA and the standby current is 10-15μA. Considering that under actual weather conditions such as cloudy days, the charging efficiency of the solar panel is reduced, and the energy consumption of the MEMS chip 2-1 during the charging process is ignored, and under the premise of considering a certain reliability, the battery needs to supply energy to the MEMS chip 2-1 for at least 24 hours; at other times, the battery energy can be fully charged under sufficient sunlight, and the battery capacity should be as high as possible while meeting the size requirements.

[0043] The packaging plastic shell 2-3 is a polymer insulator with a length of 8 cm, a width of 4 cm and a height of 4 cm after curing, and is formed by casting and curing or 3D printing.

[0044] In this embodiment, before the encapsulation plastic shell 2-3 is cast, the MEMS chip 2-1, the power supply battery 2-2 and the power line 2-4 are connected as a whole and placed in a mold, and the charging line connected to the power supply battery 2-2 extends out of the mold to facilitate the subsequent connection to the power supply end, and then the polymer insulator solution is cast and cured, and after curing and forming, it is taken out of the mold to obtain the posture sensing module 2. Since the encapsulation plastic shell 2-3 is formed by curing the polymer insulator, it has no conductivity, and has sufficient strength after curing to ensure that the posture sensing module 2 is not damaged during the road pressure process.

[0045] Furthermore, in order to increase the service life of the high-strength optical fiber 1, as Figure 5 As shown, the high-strength optical fiber 1 described in this embodiment includes a core 1-1, a cladding 1-2 and an optical fiber protective layer 1-3 arranged from the inside to the outside, that is, the cladding 1-2 is wrapped inside the core 1-1, and the optical fiber protective layer 1-3 is wrapped outside the cladding 1-2.

[0046] Among them, the fiber core 1-1 is made of silica material. The silica material itself is relatively fragile and is very easy to break under mechanical conditions such as folding and bending. Therefore, in this embodiment, a cladding 1-2 and an optical fiber protective layer 1-3 are arranged on the outside of the fiber core 1-1 to extend the service life of the fiber core 1-1.

[0047] Among them, the optical fiber protective layer 1-3 is a hard rubber sheath with fine steel strands. Six steel strands form a twisted shape. The fiber core 1-1 protected by the cladding 1-2 is located at the center of the steel strands. The steel strands have a large stiffness, which makes it difficult for the optical fiber to deform laterally when loaded. The optical fiber will not be subjected to excessive bending and shearing forces, and only tensile deformation will occur along the axial direction of the optical fiber. Since the upper paver and roller are extremely loaded during the burial process of road-used distributed optical fiber, other types of protective layer materials will also damage the optical fiber during the rolling process.

[0048] The following is a further description of the installation process and working process of the utility model to further demonstrate the working principle and advantages of the utility model:

[0049] 1. Manufacturing process of road surface strain and attitude measurement device:

[0050] Step 1, first make a casting mold of the size of the packaging plastic shell 2-3;

[0051] Step 2: Use PCB special glue to stick the MEMS chip 2-1 on the surface of the high-strength optical fiber 1, weld the power supply contacts of the power supply battery 2-2 and the MEMS chip 2-1 together through the power supply line 2-4, and lead out the charging line of the power supply battery 2-2, place the pasted MEMS chip 2-1 in the casting mold, and repeat this step until all the posture sensing modules 2 are installed;

[0052] Step 3, mix the A and B components used to make the encapsulation plastic shell 2-3, and pour them into the mold. After standing for 24 hours, the cured encapsulation plastic shell 2-3 is demolded. In this embodiment, Kraft K9741 epoxy resin is used for pouring and curing. In fact, it is only necessary to ensure that the pouring material is non-conductive and has a certain strength after curing, such as polyurethane material, which is essentially no different from this example.

[0053] Step 4, connect all the charging wires from the power supply batteries 2-2 in parallel through two copper power wires, and connect them to a power supply, which is generally solar energy;

[0054] Step 5, the ends of two adjacent high-strength optical fibers 1 are fused together to form a series connection as a whole.

[0055] 2. Installation process of road surface strain and attitude measurement device:

[0056] Grooves are opened along the length of the road surface, including the grooves for burying the high-strength optical fiber 1 and the grooves for burying the posture sensing module 2; the high-strength optical fiber 1 and the posture sensing module 2 are laid in the corresponding grooves on the road surface; in the actual burying process, for the newly built road surface, after the lower layer is laid, for the soil base and semi-rigid base materials, a fine groove equivalent to the length of the optical cable can be directly opened along the driving direction by a pickaxe, and at the location of each MEMS chip, it is expanded outward to a rectangular groove with a size of 8*4*4cm, and the aggregate of uniform thickness is laid to fill the bottom, and it is compacted with a leveling hammer to ensure that the bottom is uniform. The depth of the groove after laying the aggregate should be consistent with or slightly higher than the height of the sensing element. The sensing element should not protrude during the burying process, and 5% epoxy resin or polyurethane polymer is poured to strengthen the aggregate. After the polymer is completely cured, the sensing element is buried in the hole and placed horizontally, and the polymer is poured on the side wall to solidify, and the polymer is ensured to be in a dry state. During the burying process, it is important to ensure that the sensor X and Y axes are parallel to the longitudinal and transverse directions of the road respectively.

[0057] For the asphalt layer material, a slotting machine is used to open a thin slot on the asphalt surface along the driving direction, which is equivalent to the length of the optical cable. On this basis, an electric pick is used to expand it outward to a rectangular slot of 8*4*4, because after the asphalt material cools, it is difficult to complete it manually with a pick. After the slotting is completed, a blower is used to clean the excess debris and moisture in the slot. The rest of the backfilling process is not much different from the above.

[0058] 3. Working process of road surface strain and attitude measurement device:

[0059] 1) Strain measurement: The load generated by the vehicle on the road surface causes the road surface to strain. The coordinated deformation between the optical fiber in the road surface and the road surface causes the road surface strain to be transmitted to the optical fiber position. After the optical fiber is deformed, according to the Rayleigh scattering principle, the intensity and phase angle of the scattered light will change. Therefore, the strain can be quantified through the optical signal, that is, the road surface strain can be measured. Since the road surface strain under the known axle load is obtained by the test, it is brought into the mechanical model for performance evaluation, and it can also be judged whether the vehicle passes by.

[0060] 2) Posture measurement: Since the multi-parameter sensing unit is buried in the road surface, when the vehicle travels on the road surface, vibration and load will inevitably be generated, and transmitted to the MEMS chip 2-1 through the road surface. The vibration acceleration of the road surface can be tested by the three-axis acceleration sensor 2-1-1; in addition, the road surface will rut under the action of the cumulative load. The rutting is attributed to the flow deformation of the asphalt material. The posture of each MEMS chip 2-1 can be solved by the joint action of the three-axis acceleration sensor 2-1-1, the three-axis gyroscope 2-1-2 and the three-axis magnetic sensor 2-1-3. Based on the postures of multiple MEMS chips 2-1, the overall morphological characteristics of the rutting can be further reconstructed to quantify the disease characteristics of the road surface.

[0061] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A measuring device for monitoring road surface strain and posture, characterized in that: It includes a plurality of multi-parameter sensing units and terminal processing equipment arranged side by side along the width direction of the road surface, wherein the plurality of multi-parameter sensing units are connected in series; Each multi-parameter sensing unit comprises a high-strength optical fiber (1) and a plurality of posture sensing modules (2) arranged on the high-strength optical fiber (1) along the length direction of the high-strength optical fiber (1); the high-strength optical fiber (1) is arranged along the length direction of the road surface, and two adjacent high-strength optical fibers (1) are connected by optical fiber fusion splicing; The signal output end of the high-strength optical fiber (1) and the signal output end of the posture sensing module (2) are connected to the signal receiving end of the terminal processing equipment.

2. A measuring device for monitoring road surface strain and posture according to claim 1, characterized in that: Each posture sensing module (2) comprises a MEMS chip (2-1), a power supply battery (2-2), a packaging plastic shell (2-3) and a power line (2-4); the MEMS chip (2-1) and the power supply battery (2-2) are mounted on a high-strength optical fiber (1) via the packaging plastic shell (2-3) and are wrapped by the packaging plastic shell (2-3); the power supply battery (2-2) is connected to the MEMS chip (2-1) via the power line (2-4) to supply power to the MEMS chip (2-1).

3. A measuring device for monitoring road surface strain and posture according to claim 2, characterized in that: The MEMS chip (2-1) comprises a three-axis acceleration sensor (2-1-1), a three-axis gyroscope (2-1-2), a three-axis magnetic sensor (2-1-3), a PC (2-1-4) and an ADC analog-to-digital conversion chip (2-1-5); the information receiving end of the ADC analog-to-digital conversion chip (2-1-5) is respectively connected to the information output ends of the three-axis acceleration sensor (2-1-1), the three-axis gyroscope (2-1-2) and the three-axis magnetic sensor (2-1-3); the information output end of the ADC analog-to-digital conversion chip (2-1-5) is connected to the information receiving end of the PC (2-1-4) through a serial port; the receiving end of the PC (2-1-4) is equipped with a host computer for data collection and storage.

4. A measuring device for monitoring road surface strain and posture according to claim 3, characterized in that: The MEMS chip (2-1) further comprises a temperature sensor, and an information output terminal of the temperature sensor is connected to an information receiving terminal of the PC (2-1-4).

5. The measuring device for monitoring road surface strain and posture according to claim 2, characterized in that: The power supply battery (2-2) is a rechargeable battery with a voltage of 5V.

6. A measuring device for monitoring road surface strain and posture according to claim 2, characterized in that: The material of the packaging plastic shell (2-3) is a polymer insulator.

7. The measuring device for monitoring road surface strain and posture according to claim 1, characterized in that: The high-strength optical fiber (1) comprises a fiber core (1-1), a cladding (1-2) and an optical fiber protective layer (1-3) which are arranged in sequence from the inside to the outside.

8. A measuring device for monitoring road surface strain and posture according to claim 7, characterized in that: The optical fiber protective layer (1-3) is a hard rubber sheath with fine steel strands.

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