Optical fiber sensor based on pressure guide pipe structure and design method

Abstract

The invention discloses an optical fiber sensor based on a pressure guide pipe structure and a design method, and aims to solve the technical problem that the performance of an optical fiber sensor in the prior art is reduced due to the fact that the optical fiber sensor is easily influenced in a high-temperature environment. The optical fiber sensor comprises a front-end temperature measuring structure, the front-end temperature measuring structure is connected with a pressure guiding pipe, the other end of the pressure guiding pipe is connected with an optical fiber jumper connector, and a pressure sensing diaphragm is arranged in the end, connected with the optical fiber jumper connector, of the pressure guiding pipe. Materials comprise alloy, aluminum oxide and the like, and attribute parameters derive from a software library or experimental literatures; adding simulation parameters to obtain a simulation model; and finally carrying out analogue simulation. Through a unique structural design and a comprehensive design method, the stability and reliability of the sensor in a high-temperature environment are effectively improved, and a high-precision solution is provided for pressure measurement in the high-temperature environment.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber sensors, and in particular to an optical fiber sensor based on a pressure-inducing tube structure and a design method thereof. Background Art

[0002] With the rapid development of high-tech fields such as aerospace, aircraft engines, as core components of aviation equipment, have increasingly stringent requirements for performance and reliability. During operation, aircraft engines need to be in high temperature, high pressure, high speed and complex and changeable extreme conditions for a long time. Accurate monitoring of dynamic pressure signals in key parts of the engine, such as pipes, chambers, and combustion chambers, is of great significance for ensuring the normal operation of the engine, achieving mode switching, and improving overall performance.

[0003] However, when measuring pressure in a high-temperature environment, optical fiber sensors in the prior art expose many problems, which seriously restrict the accuracy and reliability of engine performance monitoring.

[0004] The fiber optic sensors currently on the market are very susceptible to high temperatures due to their own structural and material properties. High temperatures can have adverse effects on multiple key components of the sensor. For example, the physical properties of the fiber optic patch cord change under high temperatures, resulting in decreased signal transmission stability and even signal interruption. The pressure-sensing performance of the pressure-sensing diaphragm will also be greatly weakened by high temperatures, directly affecting the sensitivity and accuracy of pressure measurement. These problems make it difficult for the sensor to accurately obtain pressure information from key parts of the engine, and thus cannot provide a reliable basis for precise control of the engine.

[0005] In addition, the current fiber optic sensor design scheme lacks effective structural design to reduce the interference of temperature on sensor performance when dealing with high temperature environments. In terms of the model structure of pressure-sensing components, a complete design system that can adapt to high temperature conditions has not yet been formed, especially for key issues such as how to optimize the temperature relationship between the pressure-sensing position and the end, and determine the reasonable length of component extensions. There is a lack of effective solutions. This leads to the lack of accurate grasp and simulation verification of relevant parameters in the early stages of component processing and design, and parameter settings often fail to achieve the expected results, making the performance of the sensor in high temperature environments far lower than expected, and unable to meet the high-precision and high-stability requirements of aircraft engines for pressure monitoring. Therefore, there is an urgent need for a fiber optic sensor that can work stably in high temperature environments and measure pressure with high precision. Summary of the invention

[0006] The purpose of the present invention is to provide an optical fiber sensor based on a pressure-inducing tube structure and a design method thereof, so as to overcome the disadvantage that the optical fiber sensor of the prior art is easily affected in a high temperature environment and thus results in performance degradation.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: A fiber optic sensor based on a pressure-leading tube structure comprises a front-end temperature measuring structure, the front-end temperature measuring structure is connected to a pressure-leading tube, one end of the pressure-leading tube is connected to the front-end temperature measuring structure, and the other end is connected to a fiber optic jumper connector, and a pressure-sensitive diaphragm is arranged in the end where the pressure-leading tube is connected to the fiber optic jumper connector.

[0008] The pressure-sensitive diaphragm is integrated inside the pressure-guiding tube, and the two are an integrated design.

[0009] One end of the front-end temperature measuring structure is installed in the pressure-inducing pipe to form a FP pressure-sensing structure with the pressure-sensing diaphragm.

[0010] The front-end temperature measurement structure includes a core and an optical fiber, wherein the core is arranged on the outer layer of the optical fiber.

[0011] A method for designing an optical fiber sensor based on a pressure-inducing tube structure, comprising: Determine the physical parameters of the pressure-inducing pipe and construct a three-dimensional model of the pressure-inducing pipe; Add simulation parameters to the three-dimensional model of the pressure-inducing pipe to obtain a simulation model of the pressure-inducing pipe; The simulation model of the pressure-conducting pipe is simulated to obtain a point-line graph showing the relationship between the length of the pressure-conducting pipe and the temperature at the pressure-sensing position.

[0012] Determine the physical parameters of the pressure-inducing pipe and construct a three-dimensional model of the pressure-inducing pipe, including: Determine the physical parameters of the pressure pipe, including structure, material, and size; Draw a three-dimensional model of the pressure lead pipe according to the physical parameters of the pressure lead pipe; Get the corresponding properties of the material and add them to the 3D model.

[0013] The three-dimensional model structure of the pressure-inducing pipe adopts the FP pressure-sensitive structure, and the materials of the three-dimensional model of the pressure-inducing pipe include alloy materials, alumina, silicon carbide, and plastic.

[0014] The corresponding property parameters of the material come from the material library provided by the ComsolMultiphysics multi-physics field simulation software, or from experimental data and / or relevant literature.

[0015] Add simulation parameters to the three-dimensional model of the pressure-inducing pipe to obtain a simulation model of the pressure-inducing pipe, including adding a heat source at the end face of the three-dimensional model of the pressure-inducing pipe, adding a domain point probe to the pressure-sensitive surface of the three-dimensional model of the pressure-inducing pipe, and adding a heat flux to the heated end face of the three-dimensional model of the pressure-inducing pipe.

[0016] The simulation model of the pressure lead pipe is simulated to obtain a point-line diagram of the relationship between the pressure lead pipe length and the temperature at the pressure sensing position, including: Mesh the pressure pipe simulation model and select the physical field interface; Define the length parameter range and step size of the impulse pipe simulation model; Perform a parametric sweep to change the impulse line length according to the step size within the length parameter range and run simulation calculations for each length value; The pressure-sensing surface temperature data is collected by using a domain point probe; Extract the relationship between the length of the pressure-conducting pipe simulation model and the temperature of the pressure-sensing surface data, and output a point-line graph of the relationship between the length of the pressure-conducting pipe and the temperature at the pressure-sensing position.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: An optical fiber sensor based on a pressure-guiding tube structure, in terms of structural design, the front-end temperature measurement structure and the pressure-sensitive diaphragm in the pressure-guiding tube form an F-P pressure-sensitive structure. This structure can use the F-P cavity formed between the optical fiber end face and the pressure-sensitive diaphragm to accurately measure the pressure by affecting the light reflection due to the change in cavity length when the diaphragm is under pressure. Since the pressure-sensitive diaphragm and the pressure-guiding tube are an integrated design, the connection loss between components and possible sealing problems are reduced, the stability and reliability of the sensor are improved, and pressure data can be accurately obtained under complex environmental conditions. Secondly, the introduction of the pressure-guiding tube structure enables the optical fiber sensor to effectively complete pressure measurement in a high-temperature environment. When the airflow passes through the pressure-guiding tube and reaches the position of the pressure-sensitive diaphragm, the temperature will decrease, avoiding damage to the pressure-sensitive diaphragm and other key components caused by high temperature, broadening the application scenarios of the sensor, enabling it to work reliably in high-temperature environments such as near the combustion chamber of an aerospace engine and a high-temperature smelting furnace. From the perspective of material selection, the material of the pressure-guiding tube can be selected from alloy materials, aluminum oxide, silicon carbide, plastic, etc. Different materials are suitable for different working conditions. For example, silicon carbide can be used in high temperature and high pressure environments, with a high melting point and good physical properties; while in scenarios where the temperature is relatively low and the cost is required, plastic materials can be used as an option. This diverse material selection allows sensors to be flexibly applied to various industrial environments.

[0018] A method for designing an optical fiber sensor based on a pressure-conducting tube structure is provided. The method determines the physical parameters of the pressure-conducting tube to construct a three-dimensional model, including the precise determination of the structure, material, and size. This method of determining physical parameters based on actual working conditions ensures that the designed sensor can achieve optimal performance under specific conditions. In addition, by drawing a three-dimensional model and adding corresponding material properties through professional software, the performance of the sensor can be fully simulated and analyzed in the design stage, and potential problems can be discovered in advance. In the process of adding simulation parameters, operations such as adding a heat source at the end face of the three-dimensional model of the pressure-conducting tube, adding a domain point probe to the pressure-sensing surface, and adding a heat flux to the heated end face can accurately simulate the physical phenomena of heat transfer and pressure conduction of the sensor in the actual working environment. This enables designers to have an in-depth understanding of the performance of the sensor under different working conditions and provide a basis for optimizing the design. In addition, by simulating the data of the pressure-conducting tube under various materials, the performance of different materials under the same working conditions can be comprehensively evaluated. In this way, the optimal parameter combination scheme can be selected to ensure that the designed sensor achieves the best balance in terms of accuracy, reliability, high temperature resistance, etc., reducing the trial and error cost in actual production and improving R&D efficiency. When simulating the pressure-conducting pipe simulation model, the relationship between the pressure-conducting pipe length and the temperature at the pressure-sensing position can be systematically studied through meshing, selecting physical field interfaces, and performing parametric sweeps. This comprehensive and in-depth simulation analysis method helps to accurately determine the optimal length and other key parameters of the pressure-conducting pipe, thereby designing a fiber optic sensor with high precision and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the structure of an optical fiber sensor based on a pressure-guiding tube structure in an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of a method for designing an optical fiber sensor based on a pressure-guiding tube structure in an embodiment of the present invention.

[0021] Figure 3 The present invention provides a flow chart of determining the physical parameters of a pressure-leading tube and constructing a three-dimensional model of the pressure-leading tube in a method for designing a fiber optic sensor based on a pressure-leading tube structure in an embodiment of the present invention.

[0022] Figure 4 The present invention is a method for designing an optical fiber sensor based on a pressure-leading tube structure in an embodiment of the present invention. The simulation model of the pressure-leading tube is simulated to obtain a dot-line diagram flow chart of the relationship between the length of the pressure-leading tube and the temperature at the pressure-sensing position.

[0023] Figure 5 It is a dotted line diagram of the relationship between the length of the pressure-guiding tube of different materials and the temperature of the pressure-sensing position in the embodiment of the present invention.

[0024] In the figure, 1 is the front-end temperature measurement structure, 2 is the pressure lead tube, 3 is the fiber optic jumper connector, 4 is the ferrule, 5 is the optical fiber, 6 is the pressure-sensitive diaphragm, and 7 is the F-P pressure-sensitive structure. DETAILED DESCRIPTION

[0025] 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 only 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 are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0029] A specific embodiment of the present invention provides a light sensor based on a pressure-inducing tube structure and a design method, which solves the problem that the optical fiber sensor in the prior art is easily affected in a high-temperature environment and causes performance degradation.

[0030] Embodiment 1: Reference Figure 1As shown, an optical fiber sensor based on a pressure-leading tube structure provided in an embodiment of the present invention includes a front-end temperature measuring structure 1 for sensing temperature changes and converting temperature changes into measurable signals. The front-end temperature measuring structure 1 is connected to a pressure-leading tube 2, one end of the pressure-leading tube 2 is connected to the front-end temperature measuring structure 1, and the other end is connected to an optical fiber jumper connector 3. A pressure-sensitive diaphragm 6 is arranged in the end where the pressure-leading tube 2 is connected to the optical fiber jumper connector 3. Through the design of the pressure-leading tube 2, the temperature of the airflow in a high-temperature environment will not be too high when it passes through the pressure-leading tube 2 and reaches the position of the pressure-sensitive diaphragm 6, that is, a temperature reduction effect is achieved.

[0031] The pressure-sensitive diaphragm 6 is integrated inside the pressure-guiding tube 2. The two are of an integrated design, which essentially solves the problem of airtight packaging for airflow pressure measurement and optimizes the sensor test performance, measurement accuracy and stability.

[0032] One end of the front-end temperature measurement structure 1 is installed in the pressure-guiding tube 2, and forms an FP pressure-sensing structure 7 with the pressure-sensing diaphragm 6. The principle of this structure is that an FP cavity is formed between the optical fiber end face and the pressure-sensing diaphragm. When the pressure-sensing diaphragm 6 is under pressure, the length of the FP cavity changes, thereby affecting the reflection of light, and analyzing and demodulating the optical signal to obtain the effective pressure value.

[0033] The front-end temperature measurement structure 1 includes a core insert 4 and an optical fiber 5, wherein the core insert 4 is arranged on the outer layer of the optical fiber 5. The stability and durability of the sensor are improved, while ensuring that the optical fiber can effectively transmit the optical signal for temperature measurement.

[0034] It should be noted that the pressure-conducting tube 2 in the embodiment of the present application is a tubular structure, and its material selection includes but is not limited to aluminum oxide, high-temperature resistant alloys, silicon carbide and plastic materials. Furthermore, the length of the pressure-conducting tube 2 can be adjusted according to the needs of the actual scene.

[0035] Embodiment 2: Reference Figure 2 As shown, another specific embodiment of the present invention provides a method for designing an optical fiber sensor based on a pressure-inducing tube structure, which can be designed for an optical fiber sensor based on a pressure-inducing tube structure in the first embodiment of the present invention, including: Determine the physical parameters of the pressure-inducing pipe and construct a three-dimensional model of the pressure-inducing pipe; Add simulation parameters to the three-dimensional model of the pressure-inducing pipe to obtain a simulation model of the pressure-inducing pipe; The simulation model of the pressure-conducting pipe is simulated to obtain a point-line graph showing the relationship between the length of the pressure-conducting pipe and the temperature at the pressure-sensing position.

[0036] Among them, refer to Figure 3 As shown, the physical parameters of the pressure-inducing pipe are determined and a three-dimensional model of the pressure-inducing pipe is constructed, including: Determine the physical parameters of the pressure pipe, including structure, material, and size; Draw a three-dimensional model of the pressure lead pipe according to the physical parameters of the pressure lead pipe; Get the corresponding properties of the material and add them to the 3D model.

[0037] The three-dimensional model structure of the pressure-inducing pipe adopts the FP pressure-sensitive structure, and the three-dimensional model material of the pressure-inducing pipe includes alloy material, aluminum oxide, silicon carbide, and plastic.

[0038] The corresponding property parameters of the material come from the material library provided by the ComsolMultiphysics multi-physics field simulation software, or from experimental data and / or relevant literature.

[0039] Adding simulation parameters to the three-dimensional model of the pressure-inducing pipe includes adding a heat source at the end face of the three-dimensional model of the pressure-inducing pipe, adding a domain point probe to the pressure-sensitive surface of the three-dimensional model of the pressure-inducing pipe, and adding a heat flux to the heated end face of the three-dimensional model of the pressure-inducing pipe.

[0040] Among them, refer to Figure 4 As shown, the pressure lead pipe simulation model is simulated to obtain a point-line diagram of the relationship between the pressure lead pipe length and the temperature at the pressure sensing position, including: Mesh the pressure pipe simulation model and select the physical field interface; Define the length parameter range and step size of the impulse pipe simulation model; Perform a parametric sweep to change the impulse line length according to the step size within the length parameter range and run simulation calculations for each length value; The pressure-sensing surface temperature data is collected by using a domain point probe; Extract the relationship between the length of the pressure-conducting pipe simulation model and the temperature of the pressure-sensing surface data, and output a point-line graph of the relationship between the length of the pressure-conducting pipe and the temperature at the pressure-sensing position.

[0041] For ease of understanding, the present specific implementation provides a specific usage scenario of the optical fiber sensor design method based on the pressure-inducing tube structure, as follows: In the aerospace field, aircraft engines need to work reliably for a long time under high temperature, high pressure, high speed and complex and changeable conditions, and dynamic pressure signal monitoring of key parts of the engine is crucial. This optical fiber sensor design method based on the pressure lead pipe structure can effectively solve the problems faced by pressure measurement in high temperature environments.

[0042] First, when determining the physical parameters of the pressure-inducing pipe, considering the extreme requirements of high-temperature environments such as aircraft engine combustion chambers, the FP pressure-sensing structure is selected. It can use the FP cavity formed between the optical fiber end face and the pressure-sensing diaphragm to accurately measure the pressure by affecting the light reflection due to the change in cavity length when the diaphragm is under pressure. For materials, alloy materials, aluminum oxide, silicon carbide, plastics, etc. can be selected according to the working conditions of different parts. For example, in the core area near the combustion chamber where the temperature is extremely high and the strength requirements are high, silicon carbide materials can be used first. Its melting point is as high as 2273.15K, it can withstand high temperatures and has good physical properties; in parts where the temperature is relatively low and the cost is more sensitive, plastic materials can be considered, but it is necessary to ensure that its operating temperature range of 493.15K-508.15K can meet the actual working conditions.

[0043] When constructing the three-dimensional model of the pressure-conducting pipe, the three-dimensional modeling software is used for precise drawing according to the selected physical parameters. The pressure-conducting pipe is designed as a tubular structure. The specific size of the inner diameter less than 18-20mm and the outer diameter of 20-22mm can be determined according to the actual spatial layout and pressure conduction requirements. At the same time, the size of the pressure diaphragm of the integrated structure is set reasonably, such as a diameter of 17-19mm, to ensure the accuracy and stability of pressure measurement. When obtaining the corresponding properties of the material and adding it to the three-dimensional model, if the parameters in the material library of the ComsolMultiphysics multi-physics field simulation software are used, the corresponding physical properties of the model can be quickly and accurately assigned; if the properties of some special materials are not included in the software library, they can be supplemented and improved through experimental data and relevant literature to ensure the authenticity and reliability of the model.

[0044] When adding simulation parameters to the three-dimensional model of the pressure-conducting pipe, add a heat source of 1500℃, converted to Kelvin temperature 1773.15K, at the end face of the three-dimensional model of the pressure-conducting pipe to simulate the thermal impact of high-temperature environments such as the combustion chamber of an aircraft engine on the pressure-conducting pipe. Add a domain point probe to the pressure-sensitive surface of the three-dimensional model of the pressure-conducting pipe, and accurately determine the center position of the pressure-sensitive surface of the pressure-sensitive diaphragm by setting the domain point probe coordinates to (0,0,0) to accurately obtain the temperature data of the pressure-sensitive position. Add heat flux (heat flux = thermal conductivity / heat transfer distance) to the heated end face of the three-dimensional model of the pressure-conducting pipe. Considering the two materials of the pressure-conducting pipe and the air cavity, add "heat flux 1" and "heat flux 2" to the corresponding "domain" respectively, so as to accurately simulate the heat transfer process in the pressure-conducting pipe and the air cavity.

[0045] When simulating the pressure-conducting pipe simulation model, it is necessary to select the appropriate mesh type and size according to the complexity and accuracy requirements of the model when dividing the mesh to ensure the accuracy of the calculation results. When selecting the physical field interface, it is necessary to combine the actual physical phenomena, such as heat conduction, pressure conduction, etc., and select the corresponding physical field interface for simulation. The length parameter range of the pressure-conducting pipe simulation model is defined as 25-40mm, and the step size is 1, so that the effect of the change in the length of the pressure-conducting pipe on the temperature of the pressure-sensing position can be analyzed in detail. During the parametric scan, within the length parameter range of 25-40mm, the length of the pressure-conducting pipe is changed in sequence according to the step size of 1, and the simulation calculation is run for each length value to simulate the heat transfer and pressure conduction of pressure-conducting pipes of different lengths in a high temperature environment. The pressure-sensing surface temperature data is collected through the domain point probe, and these data will accurately reflect the temperature change at the pressure-sensing position when the length of the pressure-conducting pipe changes. Finally, the relationship between the length of the pressure-conducting tube simulation model and the temperature data of the pressure-sensing surface is extracted, and a dot-line graph of the relationship between the length of the pressure-conducting tube and the temperature at the pressure-sensing position is output. Based on this graph and the tolerable temperature of the optical fiber jumper of 300K-500K, the optimal length value of the pressure-conducting tube is determined while ensuring the sensor measurement sensitivity as much as possible.

[0046] In other high-temperature scenarios, the optical fiber sensor based on the pressure-guiding tube structure can also be designed according to the above method based on specific process requirements and environmental conditions.

[0047] The design is based on the alloy material 304 stainless steel. First, the overall model is constructed, and 304 stainless steel is selected as the material of the pressure tube. The end surface temperature of the pressure tube is set to 1773.15K to simulate the working environment temperature. Then the length of the pressure tube is set to d1 and a parametric sweep range (25,1,35) is added, that is, the value range of d1 is from 25 to 35, and the step size is 1. The coordinates of the center position of the pressure-sensitive diaphragm are set to (0,0,0) and a domain point probe is added here to measure the temperature. The temperature data at the measuring point position are obtained, which are 810.72K, 768.42K, 731.08K, 697.31K, 662.70K, and 634.24K respectively. The model is meshed and the corresponding calculation and analysis are performed. According to the results of meshing and calculation analysis, the size parameters of the pressure tube are determined. By analyzing the simulation results, the optimal size design can be found.

[0048] After the above analysis and calculation, it is determined that the optimal length of the lead pressure tube is 29mm in the 304 stainless steel integrated structure. During the design process, it is necessary to consider the temperature tolerance of the optical fiber jumper and ensure that the analysis results can guarantee responsiveness.

[0049] After completing the temperature change of 304 stainless steel, you can disable this material in the simulation program, enable other materials and add "domains", perform simulation analysis again, and perform the final comparison verification. Figure 5 As shown, it is a dot-line graph of the relationship between the length of the pressure-conducting tube and the temperature at the pressure-sensing position for alloy materials (taking 304 stainless steel as an example), alumina, silicon carbide, and plastic materials.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An optical fiber sensor based on a pressure-inducing tube structure, characterized in that: The invention comprises a front-end temperature measurement structure (1), wherein the front-end temperature measurement structure (1) is connected to a pressure-inducing tube (2), one end of the pressure-inducing tube (2) is connected to the front-end temperature measurement structure (1), and the other end is connected to an optical fiber jumper connector (3), and a pressure-sensitive diaphragm (6) is arranged in the end of the pressure-inducing tube (2) connected to the optical fiber jumper connector (3).

2. The optical fiber sensor based on the pressure-inducing tube structure according to claim 1, characterized in that: The pressure-sensitive diaphragm (6) is integrated inside the pressure-guiding tube (2), and the two are of an integrated design.

3. The optical fiber sensor based on the pressure-inducing tube structure according to claim 1, characterized in that: One end of the front-end temperature measurement structure (1) is installed in the pressure-guiding tube (2) to form an FP pressure-sensing structure (7) with the pressure-sensing diaphragm (6).

4. The optical fiber sensor based on the pressure-inducing tube structure according to claim 1, characterized in that: The front-end temperature measurement structure (1) comprises a core insert (4) and an optical fiber (5), wherein the core insert (4) is arranged on the outer layer of the optical fiber (5).

5. A method for designing an optical fiber sensor based on a pressure-inducing tube structure, characterized in that: include: Determine the physical parameters of the pressure-inducing pipe and construct a three-dimensional model of the pressure-inducing pipe; Add simulation parameters to the three-dimensional model of the pressure-inducing pipe to obtain a simulation model of the pressure-inducing pipe; The simulation model of the pressure-conducting pipe is simulated to obtain a point-line graph showing the relationship between the length of the pressure-conducting pipe and the temperature at the pressure-sensing position.

6. The method for designing an optical fiber sensor based on a pressure-inducing tube structure according to claim 5, characterized in that: The step of determining the physical parameters of the pressure-inducing pipe and constructing a three-dimensional model of the pressure-inducing pipe includes: Determine the physical parameters of the pressure pipe, including structure, material, and size; Draw a three-dimensional model of the pressure lead pipe according to the physical parameters of the pressure lead pipe; Get the corresponding properties of the material and add them to the 3D model.

7. The method for designing an optical fiber sensor based on a pressure-inducing tube structure according to claim 6, characterized in that: The three-dimensional model structure of the pressure-inducing pipe adopts a FP pressure-sensitive structure, and the three-dimensional model material of the pressure-inducing pipe includes alloy material, aluminum oxide, silicon carbide, and plastic.

8. The method for designing an optical fiber sensor based on a pressure-inducing tube structure according to claim 6, characterized in that: The corresponding property parameters of the material are derived from the material library provided by Comsol Multiphysics multi-physics field simulation software, or from experimental data and / or relevant literature.

9. The method for designing an optical fiber sensor based on a pressure-inducing tube structure according to claim 5, characterized in that: The method of adding simulation parameters to the three-dimensional model of the pressure-inducing pipe to obtain the simulation model of the pressure-inducing pipe includes adding a heat source at the end face of the three-dimensional model of the pressure-inducing pipe, adding a domain point probe to the pressure-sensitive surface of the three-dimensional model of the pressure-inducing pipe, and adding a heat flux to the heated end face of the three-dimensional model of the pressure-inducing pipe.

10. The method for designing an optical fiber sensor based on a pressure-inducing tube structure according to claim 9, characterized in that: The simulation model of the pressure-inducing pipe is simulated to obtain a point-line diagram of the relationship between the length of the pressure-inducing pipe and the temperature at the pressure-sensing position, including: Mesh the pressure pipe simulation model and select the physical field interface; Define the length parameter range and step size of the impulse pipe simulation model; Perform a parametric sweep to change the impulse line length according to the step size within the length parameter range and run simulation calculations for each length value; The pressure-sensing surface temperature data is collected by using a domain point probe; Extract the relationship between the length of the pressure-conducting pipe simulation model and the temperature of the pressure-sensing surface data, and output a point-line graph of the relationship between the length of the pressure-conducting pipe and the temperature at the pressure-sensing position.

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