Tank internal and external temperature field measuring device and database construction method

Abstract

The invention discloses a tank internal and external temperature field measurement device and a database construction method, and the device comprises an external temperature field measurement module which is used for measuring the surface temperature; the internal temperature field measurement module is used for measuring the internal temperature of the tank body; the internal temperature field measurement module comprises a supporting rod, a plurality of supports arranged on the supporting rod and an optical fiber temperature sensing array arranged on the supports. The support is installed on the supporting rod in a sliding mode and can slide to the position of any cross section in the tank body so as to measure the temperature of any cross section in the tank body. The database construction method comprises the step of constructing the internal and external temperature field database of the tank body based on the internal and external temperature data of the tank body collected by the device. According to the invention, flexible design can be carried out for tank bodies with different tank opening sizes, and the measurement position and the measurement range can be adjusted according to actual needs; and a training data basis is provided for building an artificial intelligence model for inverting the internal temperature field through the surface temperature field data of the tank body.

Description

Technical Field

[0001] The invention belongs to the field of tank temperature field measuring equipment, and in particular relates to a tank internal and external temperature field measuring device and a database construction method. Background Art

[0002] Gases such as hydrogen, methane, and acetylene play an important role in industrial production and daily life. These gases often need to be compressed and stored in various tanks for easy transportation and use. The filling and discharging state of the gas in the tank directly affects the safety of the tank. The process of gas filling and discharging the tank can be regarded as the process of adiabatic ideal gas expansion and compression, and the temperature inside the tank will increase or decrease significantly. By monitoring the temperature field inside the tank, the gas state inside the tank can be indirectly obtained, thereby realizing the evaluation of the safety of the tank.

[0003] Existing methods for measuring the internal temperature field of tanks mostly use electrical temperature sensors, such as thermocouples and thermistors, which are distributed inside or on the surface of the tank in the form of a single point or a few points to play a certain monitoring role. Such point-type electrical sensors do not have the ability to measure the temperature field, the amount of temperature data information obtained is limited, and they are not suitable for monitoring flammable and explosive gases, and there is a risk of causing explosions. Fiber optic sensors have been widely used in flammable and explosive gas monitoring due to their small size, high sensitivity, and resistance to electromagnetic interference. Tank monitoring based on surface quasi-distributed sensor arrays has been reported (Evaluation of embedded FBGs in composite overwrapped pressure vessels for strain based structural health monitoring. 2014), but current research is still limited to the measurement of external physical parameters.

[0004] With the development of artificial intelligence technology in recent years, constructing an internal temperature field inversion model based on external temperature field data has gradually become a research hotspot. Based on surface temperature field data, researchers have developed and successfully verified a three-dimensional temperature field inversion algorithm for the internal ablation process. (Fiber-optic temperature field monitoring based on deeplearning network for tumor thermal ablation. 2024). Data-driven is a notable feature of this type of method. Therefore, the acquisition of a large amount of high-quality training data and the construction of training samples have become the key to realizing the internal temperature field inversion method based on artificial intelligence. However, the lack of in-situ measurement methods for the internal temperature field distribution of the tank and the imperfect construction methods of the surface and internal temperature field databases of the tank have seriously restricted the development of related monitoring technologies.

[0005] How to efficiently and reliably obtain the temperature field data inside and on the surface of the tank and realize the construction of internal and external temperature field database is an important research content of the internal temperature field inversion method of the tank based on artificial intelligence, and it is also a key technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of the shortcomings of the existing technology, this application provides a device for measuring the temperature field inside and outside the tank and a method for building a database. Through the topological optical fiber temperature sensor array and the surface conformal optical fiber temperature field sensor array, real-time measurement of the overall temperature field inside and outside the tank is carried out, which has the characteristics of safety, distribution, global, high precision, online and real-time.

[0007] The object of the present invention is achieved through the following technical solutions: A device for measuring the temperature field inside and outside a tank, comprising: External temperature field measurement module, used to measure surface temperature; An internal temperature field measurement module is used to measure the internal temperature of a tank body; the internal temperature field measurement module comprises a support rod, a plurality of brackets arranged on the support rod, and an optical fiber temperature sensor array arranged on the bracket; the bracket is slidably mounted on the support rod and can slide to any cross-sectional position in the tank body to measure the temperature of any cross-sectional position in the tank body.

[0008] Furthermore, the external temperature field measurement module includes a surface conformal fiber optic temperature sensor array; the surface conformal fiber optic temperature sensor array is composed of a conformal sensing film and a temperature sensing optical fiber; the conformal sensing film is designed according to the outer surface morphology of the tank body, and a groove is provided on its surface for embedding the temperature sensing optical fiber.

[0009] Furthermore, the groove is a spiral groove, a horizontal groove, or a spiral and horizontal groove.

[0010] Furthermore, the temperature sensing optical fiber adopts a bend-resistant optical fiber, on which a large-capacity fiber grating sensing array from O band to C band is engraved.

[0011] Furthermore, the bracket is an umbrella-shaped automatic opening and closing bracket with a multi-layer design, and the spacing between the bracket surfaces is flexibly adjustable, so as to cover any cross-sectional position in the tank.

[0012] Furthermore, it also includes a temperature signal on-chip demodulation system and a host computer; the temperature signal on-chip demodulation system is used to demodulate the temperature sensor data and upload it to the host computer for data processing.

[0013] The present invention also provides a method for constructing a tank internal and external temperature field database. Based on the tank internal and external temperature data collected by the above-mentioned tank internal and external temperature field measuring device, the tank internal and external temperature field database is constructed. The construction method is as follows: according to the optical fiber sensor array topology structure, the spatial distribution of the optical fiber array sensor data is reconstructed to characterize the temperature field of each measurement section inside the tank and the tank surface; finally, the tank geometric parameters and the acquisition time parameters are integrated to establish the tank internal and external temperature field database.

[0014] Furthermore, the internal and external temperature field database of the tank body is divided into two parts: the surface temperature field data of the tank body and the temperature field data of each section inside the tank body. The data set containing time, section position information and surface temperature field information is used as the learning feature part of the database, and the temperature field data set of each section inside the tank body corresponding to the data set containing time, section position information and surface temperature field information is used as the learning feature label part of the database.

[0015] Furthermore, the characterization of the temperature field of each measurement section inside the tank body and the tank body surface includes the following steps: (1) constructing the spatial position coordinates of the temperature measurement points inside the tank body and on the tank body surface; (2) interpolation processing of discrete temperature sensor data; and (3) characterizing the spatial distribution of the temperature field inside the tank body and on the tank body surface.

[0016] Furthermore, the step (1) includes: taking the center of the bottom circle of the umbrella-shaped automatic opening and closing bracket as the coordinate origin, establishing a three-dimensional polar coordinate system, and defining the three-dimensional polar coordinates of each measuring point of the optical fiber temperature sensor array when each foldable umbrella surface of the umbrella-shaped automatic opening and closing bracket is in an open state and each measuring point of the optical fiber temperature sensor array on the surface of the tank body; The step (2) comprises: for the internal temperature measurement section, dividing the measurement section into five sector-shaped areas and a circular area in the middle according to the positions of the temperature sensing points in the section, performing temperature interpolation on the sector-shaped areas based on two temperature measurement lines, and performing interpolation on the circular area in the middle based on the outer circle temperature measurement line using a difference method; For the surface temperature measurement area, the temperature interpolation of the middle point is based on the adjacent upper and lower optical fiber measurement lines; The step (3) includes: mapping different temperature values ​​to corresponding RBG values ​​according to the temperature value range of the temperature field inside the tank and on the surface of the tank, and constructing RBG representations of different temperature values; filling the temperature color of each measuring point according to the RBG value, and obtaining the temperature cloud map of each section inside the tank and on the surface of the tank.

[0017] The technical solution provided by the embodiments of the present application includes the following beneficial effects: 1) The device for measuring the internal and external temperature field of a tank body described in the present invention can be implanted in a closed umbrella-shaped structure inside the tank body, and can be unfolded by its own weight, so as to realize the in-situ distribution measurement of the overall temperature field inside the tank body; it can be adhered to the surface of tank bodies of different shapes in a conformal manner to measure the surface temperature field. The design is flexible, and can be flexibly designed for tank bodies of different tank mouth sizes, and the measurement position and measurement range can be adjusted according to actual needs, which has the advantages of convenient measurement, repeatability, distribution, and real-time measurement.

[0018] 2) The device for measuring the internal and external temperature field of a tank and the method for constructing a database described in the present invention use an O-band to C-band fiber Bragg grating sensor array. Compared with electrical sensors, it has the characteristics of anti-electromagnetic interference, high precision, high sensitivity, and suitability for flammable and explosive gases. It has the ability of ultra-wide spectrum and large-capacity wavelength division multiplexing. Combined with an on-chip demodulation chip, it can realize a lightweight and low-power temperature sensing system.

[0019] 3) The device for measuring the internal and external temperature field of a tank and the method for constructing a database described in the present invention provide a method for constructing, characterizing and building a database of the internal and external temperature field of a tank, and provide a training data basis for constructing an artificial intelligence model for inverting the internal temperature field through the tank surface temperature field data.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1 A schematic diagram of the system composition of a device for measuring the internal and external temperature field of a tank provided by an embodiment of the present invention.

[0023] Figure 2 A schematic diagram of the actual process of placing a device for measuring the internal and external temperature field of a tank body provided by an embodiment of the present invention into a tank body.

[0024] Figure 3A flow chart of a device for measuring the internal and external temperature field of a tank provided in an embodiment of the present invention for collecting data on the internal and external temperature field of the tank.

[0025] Figure 4 A schematic diagram of a method for constructing, interpolating and characterizing the spatial position coordinates of internal and external temperature measurement points of a tank internal and external temperature field measurement device provided by an embodiment of the present invention.

[0026] The reference numerals in the figure are: 1. topological optical fiber temperature sensing array; 11 supporting rod; 12 bracket; 2. surface conformal optical fiber temperature sensing array; 3. optical fiber temperature signal on-chip demodulation system; 4. host computer; 5. tank body. DETAILED DESCRIPTION

[0027] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0028] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0029] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0030] A device for measuring the internal and external temperature field of a tank body of the present invention comprises: External temperature field measurement module, used to measure surface temperature; An internal temperature field measurement module is used to measure the internal temperature of a tank body; the internal temperature field measurement module comprises a support rod, a plurality of brackets arranged on the support rod, and an optical fiber temperature sensor array arranged on the bracket; the bracket is slidably mounted on the support rod and can slide to any cross-sectional position in the tank body to measure the temperature of any cross-sectional position in the tank body.

[0031] In one embodiment, the external temperature field measurement module includes a conformal-designed optical fiber temperature sensor array; the conformal-designed optical fiber temperature sensor array is composed of a conformal sensing film and a temperature sensing optical fiber; the conformal sensing film is designed according to the surface morphology of the tank, and a groove is provided on its surface for embedding the temperature sensing optical fiber.

[0032] In one embodiment, the groove is a spiral groove, a horizontal groove, or a spiral and horizontal groove.

[0033] In one embodiment, the temperature sensing optical fiber is a bend-resistant optical fiber on which a large-capacity fiber grating sensing array from O band to C band is inscribed.

[0034] In one embodiment, the support is an umbrella-shaped automatic opening and closing support. Figure 2 The umbrella-shaped automatic opening and closing bracket uses its own gravity to open and close. For example, when the diameter of the bottle mouth is small, it can be placed in an inverted tank in a closed manner. After the bottle is placed, the tank is turned over, and the bracket can automatically unfold to realize the deployment of the in-situ temperature sensing network in the tank. The umbrella-shaped automatic opening and closing bracket has a multi-layer umbrella design, and the distance between adjacent umbrellas is flexible and adjustable, which can cover any cross-sectional position in the tank.

[0035] In one embodiment, it also includes a temperature signal on-chip demodulation system and a host computer; the temperature signal on-chip demodulation system is used to demodulate the temperature sensing data and upload it to the host computer for data processing.

[0036] In one embodiment, the temperature signal on-chip demodulation system uses a high-speed micro-on-chip spectrometer, which has the advantages of fast demodulation speed, small size and large bandwidth, and can realize wavelength demodulation of O-band to C-band fiber Bragg gratings.

[0037] The present invention also provides a method for constructing a tank internal and external temperature field database. Based on the tank internal and external temperature data collected by the above-mentioned tank internal and external temperature field measurement device, the tank internal and external temperature field database is constructed. The construction method is as follows: according to the optical fiber sensor array topology structure, the spatial distribution of the optical fiber array sensor data is reconstructed to characterize the temperature field of each measurement section inside the tank and the tank surface; finally, the tank geometric parameters and the acquisition time parameters are integrated to establish the tank internal and external temperature field database; In one embodiment, the internal and external temperature field database of the tank is divided into two parts: the tank surface temperature field data and the temperature field data of each section inside the tank. The data set containing time, section position information and surface temperature field information is used as the learning feature part of the database, and the temperature field data set of each section inside the tank corresponding to the data set containing time, section position information and surface temperature field information is used as the learning feature label part of the database; this provides a training data basis for constructing an artificial intelligence model for inverting the internal temperature field through the tank surface temperature field data.

[0038] In one embodiment, the characterization of the temperature field of each measurement section inside the tank body and the tank body surface includes the following steps: (1) constructing the spatial position coordinates of the temperature measurement points inside the tank body and on the tank body surface; (2) interpolating discrete temperature sensor data; and (3) characterizing the spatial distribution of the temperature field inside the tank body and on the tank body surface.

[0039] Specifically, the step (1) includes: taking the center of the bottom of the bracket as the coordinate origin, establishing a three-dimensional polar coordinate system, and constructing the spatial position coordinates of the temperature measurement points inside the tank and on the surface of the tank; defining the three-dimensional polar coordinates of each measurement point of the optical fiber temperature sensor array and each measurement point of the optical fiber temperature sensor array on the surface of the tank when each foldable umbrella of the umbrella-shaped automatic opening and closing bracket is in the open state, that is, the radial distance, elevation angle and azimuth angle. ρ Defined as: the distance from the origin to the optical fiber temperature sensor array measurement point; the elevation angle θ Defined as: From positive z The connection line from the axis to the optical fiber temperature sensor array measurement point and z The angle between axes; azimuth φ Defined as: xy On the plane, from the positive x The connection line from the axis to the optical fiber temperature sensor array measurement point and x The angle between the axes. Then any measuring point of the optical fiber temperature sensor array inside the tank I mn And each measuring point of the optical fiber temperature sensor array on the tank surface O ij The three-dimensional polar coordinates of are expressed as: P Imn =( ρ Imn , θ Imn , φ Imn ); P Oij =( ρ Oij , θ Oij , φ Oij ); In the formula, P Imn The optical fiber temperature sensor array inside the tank m Measuring section n The location of the measuring points, ρ Imn ,θ Imn , φ Imn They are the optical fiber temperature sensor array inside the tank.m Measuring section n The radial distance, elevation and azimuth of each measuring point. P Oij The optical fiber temperature sensor array for the outer surface of the tank i Survey line j The location of the measuring points, ρ Iij , θ Iij , φ Iij They are respectively the optical fiber temperature sensor array of the outer surface of the tank i Survey line j The radial distance, elevation and azimuth of each measuring point.

[0040] Specifically, the step (2) includes: dividing the interpolation area according to the known spatial position coordinates of the temperature measurement points inside the tank and on the surface of the tank; using an interpolation method to interpolate the temperature value of the unknown point according to the temperature value of the known measurement point; the interpolation method includes a cubic spline interpolation method; Specifically, the step (3) includes: mapping different temperature values ​​to corresponding RBG values ​​according to the temperature value range of the temperature field inside the tank and on the surface of the tank, and constructing RBG representations of different temperature values; filling the temperature color of each measuring point according to the RBG value, and obtaining the temperature cloud map of each cross section inside the tank and on the surface of the tank.

[0041] The present invention also provides a method for predicting the internal temperature field of a tank body, which obtains a data set of the internal and external temperature field of the tank body based on the above-mentioned internal and external temperature field measuring device, and is used to train an internal temperature field inversion model; the trained internal temperature field inversion model is used to predict the internal temperature field of the tank body according to the external temperature field data of the tank body.

[0042] Figure 1 is a schematic diagram of a device for measuring the temperature field inside and outside a tank according to an exemplary embodiment, referring to Figure 1The device comprises: a topological optical fiber temperature sensing array 1, a surface conformal optical fiber temperature sensing array 2, an optical fiber temperature signal on-chip demodulation system 3, a host computer 4 and a tank body 5; the topological optical fiber temperature sensing array 1 comprises a support rod 11, a plurality of brackets 12 arranged on the support rod 11 (an umbrella-shaped automatic opening and closing bracket is used in this embodiment) and an optical fiber temperature sensing array arranged on the bracket 12. The topological optical fiber temperature sensing array 1 is used to measure the temperature field inside the tank body; the surface conformal optical fiber temperature sensing array 2 is used to measure the surface temperature field of the tank body; when the bottle mouth is small, the umbrella-shaped automatic opening and closing bracket puts the topological optical fiber temperature sensing array 1 into the tank body 5 in a closed form, and freely unfolds inside the tank body 5 by gravity, so as to ensure the topological structure of the topological optical fiber temperature sensing array inside the tank body 5; the optical fiber temperature signal on-chip demodulation system 3 and the host computer 4 are used to demodulate the temperature field data of the topological optical fiber temperature sensing array 1 and the surface conformal optical fiber temperature sensing array 2.

[0043] Figure 2 The figure is a schematic diagram showing the process of placing a device for measuring the internal and external temperature field of a tank into a tank according to an exemplary embodiment. The tank can be inverted first, and the internal temperature field monitoring device in a closed state can be placed into the tank. After the internal temperature field monitoring device is completely placed into the tank, the tank is rotated 180°, and the internal temperature field measuring device will automatically open inside the tank and can adapt to the change in the cross-sectional radius of the narrow-mouthed conical tank.

[0044] Figure 3 It is a flowchart of constructing a data set of the internal and external temperature field of a tank using a device for measuring the internal and external temperature field of the tank according to an exemplary embodiment. The construction process includes: 1) Deploying sensors inside and outside the tank, placing an automatic opening and closing topology optical fiber temperature sensor array and a surface conformal optical fiber temperature sensor array. Carrying out the internal and surface temperature field monitoring experiment of the tank to obtain the internal and surface temperature field monitoring data of the tank. 2) Constructing the spatial position coordinates of the temperature measurement points inside and on the surface of the tank. 3) Interpolating the discrete temperature sensing data inside and on the surface of the tank. 4) Characterizing the spatial distribution of the temperature field inside and on the surface of the tank. 5) Constructing a monitoring database of the internal and surface temperature field of the tank for training the inversion model of the internal temperature field of the tank.

[0045] Figure 4 The present invention is a method for constructing, interpolating and characterizing the spatial position coordinates of the temperature field measurement points inside and on the surface of a tank in a method for constructing a temperature field database inside and outside the tank according to an exemplary embodiment. 1) Spatial position coordinate construction: The method for constructing the spatial position coordinates of the internal and surface measurement points is as follows: Figure 4 As shown in the figure, taking the internal measuring point I21 and the surface measuring point O21 as examples, the bottom center of the umbrella-shaped automatic opening and closing bracket is used as the coordinate origin to establish a three-dimensional polar coordinate system and define the three-dimensional polar coordinates P of the internal measuring point I21 and the surface measuring point O21.I21 ( ρ I21 , φ I21 , θ I21 ) and P O21 ( ρ O21 , φ O21 , θ O21 ), the coordinate construction method of other measuring points is the same as that of the internal measuring point I21 and the surface measuring point O21. 2) Discrete temperature sensing data interpolation processing: 1) For the internal temperature measurement section, the measuring section is divided into five sector-shaped areas and the middle circular area according to the position of the temperature sensing point in the section. The sector-shaped area uses two temperature measuring lines for temperature interpolation, and the middle circular area uses the outer circle circular temperature measuring line for interpolation; for the surface temperature measurement area, the adjacent upper and lower optical fiber measuring lines are used for temperature interpolation of the middle point ( Figure 4 The solid points are actual temperature measurement points, and the hollow points are temperature interpolation points). 3) Characterize the spatial distribution of the temperature field inside and on the surface of the tank to obtain the temperature cloud diagrams of each section inside the tank and on the surface of the tank.

[0046] Table 1 is a sample of the internal and surface temperature field database of a tank obtained by a tank internal and external temperature field measurement device and a database construction method according to an exemplary embodiment. The database sample contains time information (Date), internal section position information of the tank (Location), tank surface temperature information (Surface1, Surface2… Surface306) and tank internal temperature information (Inner1, Inner2… Inner66). The input data is the time information (Date), the internal section position information of the tank (Location) and the tank surface temperature information (Surface1, Surface2… Surface306), and the response data is the temperature field information of different sections inside the tank (Inner1, Inner2… Inner66).

[0047] Table 1: Sample database of temperature fields inside and on the surface of the tank

[0048] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0049] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A device for measuring the internal and external temperature field of a tank, characterized in that: include: External temperature field measurement module, used to measure surface temperature; An internal temperature field measurement module is used to measure the internal temperature of a tank body; the internal temperature field measurement module comprises a support rod, a plurality of brackets arranged on the support rod, and an optical fiber temperature sensor array arranged on the bracket; the bracket is slidably mounted on the support rod and can slide to any cross-sectional position in the tank body to measure the temperature of any cross-sectional position in the tank body.

2. A device for measuring the internal and external temperature field of a tank according to claim 1, characterized in that: The external temperature field measurement module includes a surface conformal fiber temperature sensing array; the surface conformal fiber temperature sensing array consists of a conformal sensing film and a temperature sensing fiber; the conformal sensing film is designed according to the outer surface morphology of the tank body, and a groove is provided on its surface for embedding the temperature sensing fiber.

3. A device for measuring the internal and external temperature field of a tank according to claim 2, characterized in that: The groove is a spiral groove, a horizontal groove, or a spiral and horizontal groove.

4. The device for measuring the internal and external temperature field of a tank according to claim 2, characterized in that: The temperature sensing optical fiber adopts a bend-resistant optical fiber, on which a large-capacity optical fiber grating sensing array from O band to C band is engraved.

5. The device for measuring the internal and external temperature field of a tank according to claim 1, characterized in that: The bracket is an umbrella-shaped automatic opening and closing bracket with a multi-layer design, and the spacing between the bracket surfaces is flexibly adjustable, so that any cross-sectional position in the tank can be covered.

6. The device for measuring the internal and external temperature field of a tank according to claim 1, characterized in that: It also includes a temperature signal on-chip demodulation system and a host computer; the temperature signal on-chip demodulation system is used to demodulate temperature sensing data and upload it to the host computer for data processing.

7. A method for constructing a temperature field database inside and outside a tank, characterized in that: Based on the internal and external temperature data of the tank collected by the internal and external temperature field measuring device of the tank described in any one of claims 1 to 6, a database of the internal and external temperature field of the tank is constructed, and the construction method is as follows: according to the topological structure of the optical fiber sensor array, the spatial distribution of the optical fiber array sensor data is reconstructed to characterize the temperature field of each measurement section inside the tank and the surface of the tank; and the tank geometric parameters and the acquisition time parameters are integrated to establish the database of the internal and external temperature field of the tank.

8. The method for constructing a tank internal and external temperature field database according to claim 7, characterized in that: The internal and external temperature field database of the tank is divided into two parts: the surface temperature field data of the tank and the temperature field data of each section inside the tank. The data set containing time, section position information and surface temperature field information is used as the learning feature part of the database, and the temperature field data set of each section inside the tank corresponding to the data set containing time, section position information and surface temperature field information is used as the learning feature label part of the database.

9. The method for constructing a tank internal and external temperature field database according to claim 7, characterized in that: The characterization of the temperature field of each measurement section inside the tank and the surface of the tank includes the following steps: (1) constructing the spatial position coordinates of the temperature measurement points inside the tank and on the surface of the tank; (2) interpolation processing of discrete temperature sensor data; and (3) characterizing the spatial distribution of the temperature field inside the tank and on the surface of the tank.

10. The method for constructing a tank internal and external temperature field database according to claim 9, characterized in that: The step (1) comprises: taking the center of the bottom circle of the umbrella-shaped automatic opening and closing bracket as the coordinate origin, establishing a three-dimensional polar coordinate system, and defining the three-dimensional polar coordinates of each measuring point of the optical fiber temperature sensor array when each foldable umbrella surface of the umbrella-shaped automatic opening and closing bracket is in an open state and each measuring point of the optical fiber temperature sensor array on the surface of the tank body; The step (2) comprises: for the internal temperature measurement section, dividing the measurement section into five sector-shaped areas and a circular area in the middle according to the positions of the temperature sensing points in the section, performing temperature interpolation on the sector-shaped areas based on two temperature measurement lines, and performing interpolation on the circular area in the middle based on the outer circle temperature measurement line using a difference method; For the surface temperature measurement area, the temperature interpolation of the middle point is based on the adjacent upper and lower optical fiber measurement lines; The step (3) includes: mapping different temperature values ​​to corresponding RBG values ​​according to the temperature value range of the temperature field inside the tank and on the surface of the tank, and constructing RBG representations of different temperature values; filling the temperature color of each measuring point according to the RBG value, and obtaining the temperature cloud map of each section inside the tank and on the surface of the tank.

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