DTS system temperature calibration method and system based on point type FBG sensor

Abstract

The invention discloses a DTS system temperature calibration method and system based on a point-type FBG sensor, and belongs to the technical field of optical fiber sensing, and the method comprises the steps: a DTS receives Stokes light and anti-Stokes light of a temperature sensing optical fiber, an optical fiber point-type demodulator receives a spectral signal reflected by an FBG optical fiber, and carries out the collection and processing of an optical signal respectively; and converting the spectrum information into an electric signal, uploading the electric signal to an upper computer program of a host, respectively carrying out temperature regulation on the original spectrum information to obtain a temperature curve of the DTS temperature sensing optical fiber and temperature values of the three FBGs, adjusting a compensation parameter in a temperature calculation formula of the distributed optical fiber temperature sensor, and carrying out temperature compensation processing on the DTS temperature curve. The requirement for additionally arranging a relay amplification module in a traditional scheme is avoided, the system complexity and the hardware cost are remarkably reduced, the whole-section temperature measurement consistency of the ultra-long power transmission line is guaranteed, different manufacturer devices can be adapted, and meanwhile the calibration density can be flexibly expanded by increasing the number of FBG nodes.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber sensing technology, and in particular to a temperature calibration method and system for a DTS system based on a point-type FBG sensor. Background Art

[0002] Raman distributed fiber optic sensing technology is based on the spontaneous Raman scattering effect of optical fibers. By integrating the relationship between Raman scattered light intensity and scattering point temperature with the positioning technology of optical time-domain reflectometry, it enables continuous temperature field measurement over a wide range. Due to its advantages such as a large measurement range, real-time measurement, corrosion resistance, and immunity to electromagnetic interference, it has been widely used in long-distance linear temperature safety monitoring, such as in tunnels, power cables, gas pipelines, dams, and other major infrastructure projects.

[0003] In the field of power cable safety monitoring, Raman distributed fiber optic temperature sensor is an ideal non-destructive safety monitoring technology. This technology can monitor the temperature field changes of long-distance transmission lines in real time. It can also calculate the changes in cable current carrying capacity through the temperature field, providing a comprehensive and effective solution for long-distance transmission line fault monitoring and load management.

[0004] The temperature demodulation principle of Raman distributed fiber optic sensing technology is mainly based on the temperature demodulation technology of the ratio of Stokes light (Stokes) to anti-Stokes light (anti-Stokes). The wavelengths of the Stokes signal and the anti-Stokes signal are different. When transmitted along the optical fiber, the attenuation coefficients of the two scattered light beams are unequal. When measuring long-distance optical fibers, the difference in the ratio of the two light intensities increases with distance. The distant or tail optical fiber will produce non-negligible loss. When performing temperature calculations, it is necessary to compensate for the optical loss caused by the optical wavelength difference. Summary of the Invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the present invention aims to overcome the above-mentioned problems in the prior art and provides a temperature calibration method for a distributed optical fiber temperature sensing (DTS) system based on point-type fiber Bragg grating (FBG) sensors. FBG sensors are placed at specific locations on the high-voltage cables monitored by the DTS. The temperature data measured by the FBG sensors is used to compensate and adjust the DTS temperature curve, achieving temperature calibration and high-precision temperature monitoring of long-distance transmission lines.

[0007] In order to solve the above technical problems, the present invention provides the following technical solution: a DTS system temperature calibration method based on a point-type FBG sensor, which comprises the following steps:

[0008] Add optical fibers with FBG strings to the optical cable and build a DTS temperature measurement system based on point FBG sensors to receive spectral signals;

[0009] The spectral signal is converted into an electrical signal and uploaded to the host computer program to output the original spectrum;

[0010] Perform temperature demodulation on the original spectrum information in the original spectrum graph to obtain the temperature curve of the DTS temperature sensing fiber and the temperature values ​​of the three FBGs;

[0011] Adjust the temperature compensation parameters of the distributed optical fiber temperature sensor and perform temperature compensation on the DTS temperature curve.

[0012] As a preferred solution of the DTS system temperature calibration method based on point-type FBG sensors described in the present invention, the DTS temperature measurement system includes: adding an optical fiber engraved with an FBG string in an optical cable, and engraving FBGs at the head, tail and midpoint of the optical cable respectively;

[0013] The optical fiber point interrogator receives the spectrum signal reflected back from the FBG optical fiber;

[0014] The DTS temperature measurement system simultaneously receives the spectrum signal monitored by the DTS in real time and the spectrum signal uploaded by the optical fiber point demodulator.

[0015] As a preferred solution of the temperature calibration method of the DTS system based on the point-type FBG sensor described in the present invention, the spectral signal includes Stokes light and anti-Stokes light collected by the temperature sensing optical fiber.

[0016] As a preferred solution of the temperature calibration method of the DTS system based on the point-type FBG sensor of the present invention, wherein: the temperature demodulation includes performing temperature demodulation respectively according to the original spectrum output by the host computer program;

[0017] Among them, DTS calculates the accurate temperature by demodulation method with spectral signal and reference fiber as reference.

[0018] As a preferred solution of the DTS system temperature calibration method based on the point-type FBG sensor of the present invention, the temperature curve of the DTS temperature sensing optical fiber includes a temperature curve calculated based on the calculated accurate temperature result without considering the attenuation coefficient difference;

[0019] Temperature measurement is achieved by establishing a mathematical relationship between FBG wavelength offset and external temperature, and calculating the mapping relationship between the central wavelength and temperature of the FBG reflection spectrum;

[0020] The host computer program monitors the changes in the FBG central wavelength through the FBG reflection spectrum and obtains the temperatures at the three FBG positions.

[0021] As a preferred solution of the temperature calibration method of the DTS system based on the point-type FBG sensor of the present invention, the temperature compensation process includes, based on the temperatures obtained at the three FBG positions, measuring the temperature value of the temperature curve measured by the DTS and the actual measured temperature value at the first FBG position, and calculating the temperature error;

[0022] Calculate the temperature relationship between the temperature value of the temperature curve measured by DTS and the actual measured temperature value;

[0023] The temperature compensation parameter between any two temperature measurement points of the optical cable is calculated according to the temperature relationship.

[0024] As a preferred solution of the temperature calibration method of the DTS system based on the point-type FBG sensor of the present invention, the temperature compensation processing further includes compensating the original DTS temperature curve according to the attenuation coefficient difference and calculating the compensated temperature.

[0025] Another object of the present invention is to provide a DTS system temperature calibration system based on point-type FBG sensors.

[0026] In order to solve the above technical problems, the present invention provides the following technical solutions: a DTS system temperature calibration system based on a point-type FBG sensor, comprising: a signal acquisition module, a signal conversion module, a temperature adjustment module and a temperature compensation module;

[0027] The signal acquisition module adds an optical fiber with an FBG string in the optical cable to build a DTS temperature measurement system based on point FBG sensors to receive spectral signals;

[0028] The signal conversion module converts the spectral signal into an electrical signal and uploads it to the host computer program to output the original spectrum;

[0029] The temperature adjustment module performs temperature adjustment on the original spectrum information in the original spectrum graph to obtain the temperature curve of the DTS temperature sensing optical fiber and the temperature values ​​of the three FBGs;

[0030] The temperature compensation module adjusts the temperature compensation parameters of the distributed optical fiber temperature sensor and performs temperature compensation processing on the DTS temperature curve.

[0031] The present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the DTS system temperature calibration method based on a point-type FBG sensor are implemented.

[0032] The present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the temperature calibration method of the DTS system based on a point-type FBG sensor.

[0033] Beneficial effects of the present invention: The system structure of the present invention is simplified: temperature calibration is achieved by integrating FBG sensors inside the optical fiber, avoiding the need for additional relay amplification modules in traditional solutions, and significantly reducing system complexity and hardware costs.

[0034] The long-distance temperature monitoring system of the present invention can compensate for the influence of factors such as optical fiber attenuation and Raman scattering fluctuation on the temperature curve by setting distributed FBG calibration points at the near end, far end and middle end, thus ensuring the consistency of temperature measurement along the entire section of the ultra-long transmission line.

[0035] Compatibility and scalability of the present invention: The temperature compensation mechanism based on the algorithm level does not require changes to the DTS infrastructure and can be adapted to devices from different manufacturers. It also supports flexible expansion of the calibration density by increasing the number of FBG nodes.

[0036] Compared with the existing patent ZL201210323809.9, the advantage of this method is that there is no need to add a relay amplification module to the system. By demodulating the FBG signal, the distributed optical fiber temperature curve can be compensated at the temperature algorithm level. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is an overall flow chart of a temperature calibration method for a DTS system based on point-type FBG sensors provided by one embodiment of the present invention.

[0039] Figure 2 A schematic diagram of a DTS system based on point-type FBG sensors and a temperature calibration method of a DTS system based on point-type FBG sensors provided by an embodiment of the present invention is shown.

[0040] Figure 3This is a comparison diagram of an uncalibrated temperature curve of a DTS system temperature calibration method based on a point-type FBG sensor provided by an embodiment of the present invention and a temperature curve calibrated using the temperature measured by the FBG sensor.

[0041] Figure 4 This is a system solution module diagram of a DTS system temperature calibration system based on point-type FBG sensors provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0042] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0043] Example 1, with reference to Figure 1-Figure 2 , which is the first embodiment of the present invention, provides a DTS system temperature calibration method based on a point-type FBG sensor, comprising:

[0044] S1: Add an optical fiber with an FBG string to the optical cable and build a DTS temperature measurement system based on point FBG sensors to receive spectral signals; convert the spectral signals into electrical signals and upload them to the host computer program to output the original spectrum.

[0045] An optical fiber with FBG strings engraved on it is added to the optical cable. FBGs are engraved on the head, tail and midpoint of the optical cable. The specific schematic diagram is shown in the figure below. Figure 2 As shown;

[0046] The optical fiber point interrogator receives the spectrum signal reflected back from the FBG optical fiber;

[0047] A DTS temperature measurement system based on point-type FBG sensors is constructed. The DTS temperature measurement system simultaneously receives the spectral signal monitored in real time by the DTS and the spectral signal uploaded by the optical fiber point-type demodulator, and then uses the host computer program to demodulate their respective original spectra.

[0048] The spectral signal includes Stokes light and anti-Stokes light collected by the temperature sensing optical fiber.

[0049] S2: Perform temperature demodulation on the original spectrum information in the original spectrum graph to obtain the temperature curve of the DTS temperature sensing fiber and the temperature values ​​of the three FBGs.

[0050] It should be noted that the original spectral information in the original spectrum is temperature demodulated, and DTS calculates the precise temperature using the demodulation method with the spectral signal and the reference fiber as reference;

[0051] In the present invention, an optional method is as follows: DTS uses a two-way ratio demodulation method with Stokes light as a reference, and the formula for calculating the precise temperature using the two-way ratio demodulation method with the reference optical fiber as the base point is:

[0052]

[0053] Where T(L) is the temperature of any temperature measurement point L on the optical cable, T(L0) is the temperature of any temperature measurement point L0 of the system reference optical fiber, R(T,L) and R(T0,L0) are the ratios of Raman Stokes light to anti-Stokes light, and k B is the Boltzmann constant, h is the Planck constant, α as is the propagation attenuation coefficient of anti-Stokes light in the optical fiber, α s is the propagation attenuation coefficient of Stokes light in the optical fiber.

[0054] Among them, the attenuation coefficient α of the two scattered light beams is as and α s The two optical intensities are not equal. When measuring long-distance optical fibers, the difference in the ratio of the two optical intensities increases with the distance, and the distant or tail optical fiber will produce non-negligible loss.

[0055] In an optional embodiment, the characteristics of Stokes light and anti-Stokes light in the original spectrum can be used to perform temperature demodulation through a machine learning algorithm, specifically:

[0056] The system collects a large amount of spectral signal data and labels it with corresponding temperature values. The data includes the intensity information of Stokes light and anti-Stokes light under different temperature conditions. Features are extracted from the collected spectral signals, such as the height, position and width of the spectral peak, reflecting temperature changes. Using the labeled data set, suitable machine learning algorithms (such as random forests, support vector machines, etc.) are selected for model training to establish a mapping relationship between spectral features and temperature.

[0057] In another optional embodiment, an adaptive filter is used to eliminate noise in the spectral signal, thereby performing temperature demodulation more accurately, specifically:

[0058] The system acquires the raw spectral signal from the fiber optic point demodulator and identifies the noise component. It processes the spectral signal using an adaptive filter. Based on the characteristics of the spectral signal, the filter parameters are dynamically adjusted to minimize the impact of noise on the signal and extract more accurate Stokes and anti-Stokes light signals. The filtered signal is used for temperature demodulation. The ratio of Stokes and anti-Stokes light is used to compare the measured temperature with previously recorded reference data for calibration. The adaptive filter parameters are continuously updated to maintain high-precision temperature measurements under changing environmental conditions.

[0059] It should also be noted that the host computer program monitors the changes in the FBG central wavelength through the FBG reflectance spectrum and obtains the temperatures at the three FBG positions.

[0060] Based on the calculated temperature demodulation result without considering the attenuation coefficient difference, the temperature curve is calculated:

[0061]

[0062] Based on the temperature calculated by this formula, calibration is required to obtain the accurate temperature value.

[0063] It should be noted that the period and refractive index of the FBG grating region will change due to temperature, causing its wavelength to shift.

[0064] Temperature measurement is achieved by establishing a mathematical relationship between the FBG wavelength offset and the external temperature, and the mapping relationship between the central wavelength and temperature of the FBG reflection spectrum is calculated:

[0065]

[0066] Where T0 is the central wavelength of FBG and B K is the temperature sensitivity coefficient of FBG, and there is a linear relationship between Δλ and ΔT of FBG.

[0067] The host computer program monitors the change of the FBG central wavelength through the FBG reflection spectrum, obtains the central wavelength data of each position, analyzes the collected spectral data, calculates the change of the central wavelength of each FBG position, and marks them as λ1, λ2 and λ3 corresponding to the temperature of the component position. These changes are matched with the known temperature sensitivity coefficient. By substituting the central wavelength change of each FBG into the temperature mapping relationship, the temperatures of the three FBG positions are obtained. and

[0068] S3: Adjust the temperature compensation parameters of the distributed optical fiber temperature sensor and perform temperature compensation processing on the DTS temperature curve.

[0069] Furthermore, based on the temperatures of the three FBG positions, the temperature values ​​of the temperature curve measured by DTS at the first FBG position are respectively The actual measured temperature is The temperature errors of the two measurement methods are calculated as:

[0070]

[0071] and and The temperature relationship between them is:

[0072]

[0073] Thus, the temperature compensation parameter from L0 to L1 is calculated, that is, the attenuation coefficient difference (α as -α s ), similarly, the temperature compensation parameter between any two temperature measurement points of the optical cable such as L1 to L2, L2 to L3, etc. can be obtained, that is, the attenuation coefficient difference (α as -α s ).

[0074] It should be noted that, according to the attenuation coefficient difference of each segment (α as -α s ), compensate the original DTS temperature curve, and the temperature calculation formula after compensation is:

[0075]

[0076] The compensated temperature T is calculated and temperature calibration is realized, thereby achieving the purpose of high-precision temperature monitoring of long-distance transmission lines.

[0077] In an optional embodiment, compensation for the original DTS temperature curve can be achieved by establishing a system temperature field model to conduct a more detailed analysis of the temperature distribution within the optical cable. The temperature field model is based on real-time data acquired by existing FBG sensors and the DTS system, and uses numerical simulation methods (such as the finite element method) to predict the temperature distribution at different locations. These simulation results will provide a reference for subsequent temperature compensation.

[0078] The temperature data obtained by the DTS system is integrated with the data measured by the FBG sensor, and a weighted average or interpolation algorithm is used to obtain smoother and more accurate temperature field data. During each measurement cycle, the temperature field model is regularly updated to take into account factors such as changes in the external environment and cable load to ensure that the model can reflect the actual temperature field distribution of the system in real time. Based on the newly generated temperature field model, the temperature compensation parameters of the DTS system are dynamically adjusted to correct the original temperature curve and improve the overall measurement accuracy.

[0079] In another optional embodiment, the original DTS temperature curve may be compensated by using a long short-term memory network (LSTM) for time series analysis and compensation of temperature data.

[0080] Historical temperature data from DTS and FBG sensors is collected to construct a time series dataset, recording time, temperature, and corresponding environmental parameters (such as humidity and wind speed). This time series data is trained using an LSTM network to learn the temporal characteristics of temperature changes, enabling the model to understand the patterns of temperature change. When new temperature data is acquired, the trained LSTM model is used to predict the current temperature, enabling dynamic compensation of the original DTS temperature curve. The model combines real-time environmental parameters with historical data to achieve more accurate temperature calibration.

[0081] Example 2, reference Figure 3 , which is the second embodiment of the present invention, provides a DTS system temperature calibration method based on a point-type FBG sensor. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0082] The DTS system is used to collect the Raman scattering signal on an optical cable, and a temperature curve without calibration and a temperature curve calibrated by the temperature measured by the FBG sensor are plotted for comparison. The data is as follows: Figure 2 As shown;

[0083] From the compensation results, it can be seen that the temperature after compensation at room temperature no longer changes with distance and is almost a horizontal straight line. Compared with the temperature curve without compensation, the temperature error of the optical fiber at the end is reduced from 11.2°C to 1.2°C.

[0084] Example 3 is the third embodiment of the present invention, which differs from the first two embodiments in that:

[0085] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0086] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0087] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0088] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0089] Example 4, with reference to Figure 4 , which is the fourth embodiment of the present invention, provides a DTS system temperature calibration system based on a point-type FBG sensor, comprising: a signal acquisition module, a signal conversion module, a temperature adjustment module, and a temperature compensation module;

[0090] The signal acquisition module adds an optical fiber with an FBG string to the optical cable to build a DTS temperature measurement system based on point FBG sensors to receive spectral signals;

[0091] The signal conversion module converts the spectral signal into an electrical signal and uploads it to the host computer program to output the original spectrum;

[0092] The temperature adjustment module adjusts the temperature of the original spectrum information in the original spectrum graph to obtain the temperature curve of the DTS temperature sensing fiber and the temperature values ​​of the three FBGs;

[0093] The temperature compensation module adjusts the temperature compensation parameters of the distributed optical fiber temperature sensor and performs temperature compensation processing on the DTS temperature curve.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A temperature calibration method for a DTS system based on a point-type FBG sensor is characterized by: include, Add optical fibers with FBG strings to the optical cable and build a DTS temperature measurement system based on point FBG sensors to receive spectral signals; The spectral signal is converted into an electrical signal and uploaded to the host computer program to output the original spectrum; Perform temperature demodulation on the original spectrum information in the original spectrum graph to obtain the temperature curve of the DTS temperature sensing fiber and the temperature values ​​of the three FBGs; Adjust the temperature compensation parameters of the distributed optical fiber temperature sensor and perform temperature compensation on the DTS temperature curve.

2. The temperature calibration method for a DTS system based on a point-type FBG sensor according to claim 1, wherein: The DTS temperature measurement system includes adding an optical fiber with an FBG string inscribed in the optical cable, and FBGs are inscribed at the head, tail and midpoint of the optical cable respectively; The optical fiber point interrogator receives the spectrum signal reflected back from the FBG optical fiber; The DTS temperature measurement system simultaneously receives the spectrum signal monitored by the DTS in real time and the spectrum signal uploaded by the optical fiber point demodulator.

3. The temperature calibration method for a DTS system based on a point-type FBG sensor according to claim 2, wherein: The spectral signal includes Stokes light and anti-Stokes light collected by the temperature sensing optical fiber.

4. The temperature calibration method for a DTS system based on a point-type FBG sensor according to claim 3, wherein: The temperature demodulation includes performing temperature demodulation according to the original spectrum output by the host computer program; Among them, DTS calculates the accurate temperature by demodulation method with spectral signal and reference fiber as reference.

5. The temperature calibration method for a DTS system based on a point-type FBG sensor according to claim 4, wherein: The temperature curve of the DTS temperature sensing optical fiber includes a temperature curve calculated based on the calculated accurate temperature result without considering the attenuation coefficient difference; Temperature measurement is achieved by establishing a mathematical relationship between FBG wavelength offset and external temperature, and calculating the mapping relationship between the central wavelength and temperature of the FBG reflection spectrum; The host computer program monitors the changes in the FBG central wavelength through the FBG reflection spectrum and obtains the temperatures at the three FBG positions.

6. The temperature calibration method for a DTS system based on a point-type FBG sensor according to claim 5, wherein: The temperature compensation process includes, based on the temperatures obtained at the three FBG positions, measuring the temperature value of the temperature curve measured by the DTS and the actual measured temperature value at the first FBG position, and calculating the temperature error; Calculate the temperature relationship between the temperature value of the temperature curve measured by DTS and the actual measured temperature value; The temperature compensation parameter between any two temperature measurement points of the optical cable is calculated according to the temperature relationship.

7. The temperature calibration method for a DTS system based on a point-type FBG sensor according to claim 6, wherein: The temperature compensation process further includes compensating the original DTS temperature curve according to the attenuation coefficient difference and calculating the compensated temperature.

8. A DTS system temperature calibration system based on a point-type FBG sensor, applying the DTS system temperature calibration method based on a point-type FBG sensor according to any one of claims 1 to 7, characterized in that: include: Signal acquisition module, signal conversion module, temperature adjustment module and temperature compensation module; The signal acquisition module adds an optical fiber with an FBG string in the optical cable to build a DTS temperature measurement system based on point FBG sensors to receive spectral signals; The signal conversion module converts the spectral signal into an electrical signal and uploads it to the host computer program to output the original spectrum; The temperature adjustment module performs temperature adjustment on the original spectrum information in the original spectrum graph to obtain the temperature curve of the DTS temperature sensing optical fiber and the temperature values ​​of the three FBGs; The temperature compensation module adjusts the temperature compensation parameters of the distributed optical fiber temperature sensor and performs temperature compensation processing on the DTS temperature curve.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the temperature calibration method of a DTS system based on a point-type FBG sensor according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the temperature calibration method of a DTS system based on a point-type FBG sensor according to any one of claims 1 to 7 are implemented.

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