A system and method for testing the refractive index of a pressure reflective layer of an optical fiber cable fabric under pressure

Abstract

The application discloses a kind of optical fiber cable fabric pressure reflection layer refractive index pressure test system and method, it is related to optical fiber cable technical field, the system includes: connection positioning module, parameter configuration module, pressure acquisition module, analysis transmission module and cyclic export module;The application is by constructing and including connection positioning, parameter configuration, pressure acquisition, analysis transmission, cyclic export test architecture, let the whole of each link of optical fiber cable fabric test form orderly link, by electromagnetic shield cover to the closed test area, cooperate with the synchronous start operation of data acquisition unit and pressure exertion unit, real-time pressure value and reflection layer refractive index, reflected light power data are synchronously marked and then transmitted, make pressure exertion and multiple types of optical data acquisition form accurate linkage, let test whole process advance according to preset specification architecture, realize the collaborative operation of test process and data acquisition.

Description

Technical Field

[0001] This invention relates to the field of optical fiber and cable technology, specifically to a system and method for testing the refractive index of the pressure reflective layer of optical fiber and cable fabric. Background Technology

[0002] Fiber optic cable fabric is a functional fabric that combines the optical properties of fiber optics with the braided structure of polyester fibers. It is currently widely used in various fields such as intelligent sensing, communication transmission, and industrial testing, becoming an important carrier for signal perception and transmission in various intelligent systems. As the performance requirements of equipment in various fields continue to increase, the application scenarios of fiber optic cable fabric continue to expand, and the market demand for its quality testing and performance evaluation is also increasing. The supporting development of related testing technologies has become an important support for the development of the industry.

[0003] However, existing technologies for pressure testing of the refractive index of the pressure-reflective layer of fiber optic cable fabrics lack integrated testing technology. The various stages of testing operate in a decentralized manner, lacking standardized collaborative design for positioning, pressure application, data acquisition, and analysis. There is also a lack of a dedicated electromagnetic shielding testing environment. Data acquisition and pressure application lack synchronous linkage, and precise refractive index calibration is not performed for specific operating pressure conditions. Furthermore, the processing, storage, and export of test data are disconnected from the testing process, and there is no standardized pressure relief and data integration mechanism for cyclic testing. This results in a lack of continuity in the testing process and insufficient data correlation and effectiveness. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a pressure testing system and method for the refractive index of the pressure-reflective layer of optical fiber and cable fabric. This invention constructs a test architecture that includes connection and positioning, parameter configuration, pressure application and acquisition, analysis and transmission, and loop export, so that each link in the testing of optical fiber and cable fabric forms an orderly and interconnected whole. The test area is sealed by an electromagnetic shielding cover, and the data acquisition unit and the pressure application unit are started and operated synchronously. The real-time pressure value and the refractive index and reflected light power data of the reflective layer are synchronously marked and transmitted, so that the pressure application and the acquisition of multiple types of optical data form a precise linkage relationship. The entire test process proceeds according to the preset standard architecture, realizing the coordinated operation of the test process and data acquisition.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In one aspect, a system for testing the refractive index pressure of a pressure-reflective layer in an optical fiber cable fabric, the system comprising:

[0006] Connection and positioning module: The fiber optic cable fabric test core is laid and fixed on the test platform of the pressure application unit, and the positioning is completed by the limiting structure. The two ends are respectively connected to the optical emitting unit and the optical receiving unit.

[0007] Parameter configuration module: Sets unified test parameters through the data processing unit, determines the test scenario, input pressure application range, pressure increase rate, data acquisition frequency and test cycle number, and transmits the test parameters to the pressure application unit;

[0008] Pressure acquisition module: The electromagnetic shielding cover covers the test area of ​​the fiber optic cable fabric test core, sends a start command to the pressure application unit, applies surface pressure to the fiber optic cable fabric test core according to the pressure increase rate, and collects the refractive index data of the reflective layer and the reflected light power data. After preprocessing, the data is transmitted to the data processing unit.

[0009] Analysis and transmission module: The data processing unit receives the preprocessed refractive index data and reflected light power data of the reflective layer, retrieves the preset working pressure value, compares the refractive index data of the reflective layer collected under the pressure with the preset refractive index threshold of the reflective layer and completes the calibration, plots the pressure-refractive index-light power linkage curve based on the calibrated data, and then transmits the calibrated data and linkage curve to the display unit for visualization display, while storing each data.

[0010] Cyclic Export Module: When the pressure applied by the pressure application unit reaches the target pressure, a pressure relief operation is performed until the reflective layer of the fiber optic cable fabric test core returns to its initial pressure-free state, completing a single test. Then, according to the number of test cycles, after completing the cyclic test, a test average data report is generated and stored in the data server, which can be exported through the data server's export interface.

[0011] Furthermore, in the connection and positioning module, the two ends of the fiber optic cable fabric test core are respectively connected to the output end of the optical transmitting unit and the input end of the optical receiving unit to complete the connection between the fiber optic cable fabric test core and the optical transmitting unit and the optical receiving unit. The middle section of the connected fiber optic cable fabric test core is then laid flat on the test table surface of the pressure application unit, and its placement is adjusted to align with the positioning marks on the test table. The middle section of the fiber optic cable fabric test core is fixed on the test table using a detachable fixing method, and then positioned by a limiting structure.

[0012] Furthermore, in the parameter configuration module, when setting test parameters, the user sequentially selects the test scenario as surface pressure simulation, the input pressure application range as 0~100N, the pressure increase rate as 1N / s, the data acquisition frequency as 10Hz, and the number of test cycles as 2~4 times in the operation interface of the data processing unit. After completing the initial setting of all test parameters, the user performs overall confirmation. After confirmation, a parameter locking command is triggered to fix the test parameters. Then, the locked test parameters are transmitted to the pressure application unit through the data transmission link.

[0013] Furthermore, in the pressure acquisition module, the electromagnetic shielding cover is activated, causing it to close downwards until it completely covers the test area of ​​the fiber optic cable fabric test core and the connection points between the optical emitting unit, the optical receiving unit, and the fiber optic cable fabric test core, thus completing the sealing of the test area. Then, the data processing unit sends a start command to the pressure application unit, applying surface pressure to the fiber optic cable fabric test core according to the pressure increase rate in the test parameters. Simultaneously, the data acquisition unit is activated, acquiring the refractive index data of the reflective layer of the fiber optic cable fabric test core through the built-in fiber refractive index detection component, and acquiring the reflected light power data of the fiber optic cable fabric test core through the optical receiving unit. These data are then amplified and filtered in sequence before being transmitted to the data processing unit via a wired transmission link. During the process of applying surface pressure to the fiber optic cable fabric test core, the pressure application unit continuously acquires the real-time applied pressure value, synchronously marks the real-time pressure value along with the reflective layer refractive index data and the reflected light power data, and then transmits the marked real-time pressure value to the data processing unit.

[0014] Furthermore, in the analysis and transmission module, the data processing unit receives preprocessed reflective layer refractive index data, reflected optical power data, and synchronously marked real-time pressure values. It integrates these data according to a time series, retrieves a preset 50N operating pressure value, matches the reflective layer refractive index data collected under this pressure, and compares the reflective layer refractive index data with a preset reflective layer refractive index threshold using a refractive index threshold calibration formula to complete the calibration. Based on the calibrated reflective layer refractive index data, a pressure-refractive index-optical power linkage curve is plotted with the pressure value as the abscissa and the refractive index value and optical power value as the ordinates, respectively, within the pressure range of 0~100N. The calibrated data and the plotted linkage curve are then transmitted to the display unit for visualization. Simultaneously, the integrated data, calibrated data, refractive index threshold calibration results, and linkage curve data are stored through a data server.

[0015] Furthermore, in the analysis transmission module, the refractive index threshold calibration formula is: ,in, The refractive index value of the reflective layer under calibrated pressure of 50N. The data collected includes the refractive index of the reflective layer under a pressure of 50N. The refractive index threshold of the reflective layer of this type of optical fiber cable fabric under 50N pressure is determined by the manufacturer of the optical fiber cable fabric. To obtain the reference value of the refractive index of the core under the initial pressureless state, the data was acquired by connecting to the data acquisition unit after positioning.

[0016] Furthermore, in the analysis and transmission module, after the display unit receives the calibrated data and the linkage curve, it displays the real-time pressure value, real-time refractive index value, and real-time optical power value in digital form through the display interface, and displays the pressure-refractive index-optical power linkage curve in graphical form through the display interface. The data processing unit performs eigenvalue fitting on the plotted linkage curve using the pressure-refractive index-optical power linkage feature fitting formula, obtains the linkage feature parameters, and then displays the linkage feature parameters along with the numbers and graphs on the display interface. At the same time, the linkage feature parameters are stored in the data server.

[0017] Furthermore, in the analysis and transmission module, the pressure-refractive index-optical power linkage feature fitting formula is: ,in, This is a linked characteristic parameter of pressure, refractive index, and optical power. The refractive index correlation coefficient is determined by the linear correlation between the calibrated refractive index data of the reflective layer and the pressure value. The refractive index value of the reflective layer under calibrated pressure of 50N. The optical power correlation coefficient is determined by the linear correlation between the collected real-time reflected optical power data and the pressure value. For the real-time reflected light power data collected, The linkage characteristic is a fundamental constant, determined by the inherent optical properties of the braided layer of the fiber optic cable fabric test core, and is an inherent calibration parameter of the fiber optic cable fabric at the time of production.

[0018] Furthermore, in the cyclic output module, when the pressure applied by the pressure application unit reaches 100N, a pressure compliance signal is sent to the data processing unit. Based on the pressure compliance signal, the data processing unit sends a pressure relief command to the pressure regulating unit. After receiving the pressure relief command, the pressure regulating unit performs the pressure relief operation. The cyclic test is repeated according to the number of test cycles. After the cyclic test is completed, the data processing unit sends a data retrieval command to the data server to retrieve the full calibration data and linkage characteristic parameters of the cyclic test, generates an average data report of the cyclic test, and stores it in the data server.

[0019] On the other hand, a method for testing the refractive index pressure of the pressure-reflective layer of optical fiber cable fabric includes the following specific steps:

[0020] Connection and positioning: The fiber optic cable fabric test core is laid and fixed on the test platform of the pressure application unit, and the positioning is completed by the limiting structure. The two ends are respectively connected to the optical emitting unit and the optical receiving unit.

[0021] Parameter configuration: Set unified test parameters through the data processing unit, determine the test scenario, input pressure application range, pressure increase rate, data acquisition frequency and test cycle number, and transmit the test parameters to the pressure application unit;

[0022] Pressure acquisition: The electromagnetic shielding cover is activated to cover the test area of ​​the fiber optic cable fabric test core. A start command is sent to the pressure application unit to apply surface pressure to the fiber optic cable fabric test core according to the pressure increase rate. The refractive index data of the reflective layer and the reflected light power data are collected and transmitted to the data processing unit after preprocessing.

[0023] Analysis and transmission: The data processing unit receives the preprocessed refractive index data and reflected light power data of the reflective layer, retrieves the preset working pressure value, compares the refractive index data of the reflective layer collected under this pressure with the preset refractive index threshold of the reflective layer and completes the calibration, plots the pressure-refractive index-light power linkage curve based on the calibrated data, and then transmits the calibrated data and linkage curve to the display unit for visualization display, while storing each data.

[0024] Cyclic Export: When the pressure applied by the pressure application unit reaches the target pressure, a pressure relief operation is performed until the reflective layer of the fiber optic cable fabric test core returns to its initial pressure-free state, completing a single test. Then, according to the number of test cycles, after completing the cyclic test, a test average data report is generated and stored in the data server, which can be exported through the data server's export interface.

[0025] Compared with existing technologies, the new system and method for testing the refractive index of the pressure-reflective layer of optical fiber and cable fabric has the following advantages:

[0026] I. This invention constructs a test architecture that includes connection positioning, parameter configuration, pressure acquisition, analysis and transmission, and loop export, enabling all aspects of fiber optic cable fabric testing to form an orderly and interconnected whole. By enclosing the test area with an electromagnetic shield, and coordinating the synchronous operation of the data acquisition unit and the pressure application unit, real-time pressure values, along with data on the refractive index of the reflective layer and the reflected light power, are synchronously marked and transmitted. This establishes a precise linkage between pressure application and the acquisition of multiple types of optical data, allowing the entire test process to proceed according to the preset standard architecture and achieving coordinated operation of the test process and data acquisition.

[0027] Second, this invention integrates multiple types of received test data through a data processing unit to perform time-series integration, completes the calibration operation of the refractive index of the reflective layer under specific working pressure conditions, and then completes the plotting of the pressure-refractive index-optical power linkage curve based on the calibrated data. At the same time, the linkage curve is fitted with eigenvalues ​​to obtain linkage characteristic parameters. Various calibration data, curves and characteristic parameters are synchronously transmitted to the display unit for visualization and stored in the data server. Combined with the pressure relief control after cyclic testing and the integration and analysis of full data, an average data report is generated, realizing integrated management of test data from processing, analysis to storage and export, so that the processing and application of test data are in line with the testing needs of optical fiber and cable fabrics.

[0028] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0030] Figure 1 A flowchart of a method for testing the refractive index pressure of a pressure-reflective layer in an optical fiber cable fabric;

[0031] Figure 2 A framework diagram of a pressure testing system for the refractive index of a pressure-reflective layer in an optical fiber cable fabric.

[0032] Figure 3 This is a framework diagram of the analysis and transmission module in a pressure testing system for the refractive index of a pressure-reflective layer in an optical fiber cable fabric. Detailed Implementation

[0033] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0034] Example:

[0035] In the finished product quality inspection stage of the manufacturing enterprise that mass-produces optical fiber and cable fabric, the enterprise is equipped with a professional constant temperature and humidity optical testing laboratory. The laboratory is equipped with anti-static operating tables and standard optical testing facilities. All testing equipment has completed the preliminary debugging and calibration. This time, the factory test of the refractive index pressure performance of the pressure reflection layer of a batch of polyester fiber braided optical fiber and cable fabric test cores was carried out. Multiple cores were randomly selected from each batch for testing.

[0036] Take the fiber optic cable fabric test core to be tested, and precisely connect both ends of the core to the output end of the optical transmitting unit and the input end of the optical receiving unit, respectively. During the connection process, ensure that the fiber optic link is not bent or loose. Then, lay the middle section of the connected core flat on the test table surface of the pressure application unit, and slowly adjust the placement of the core so that the central axis of the core is completely aligned with the positioning mark preset on the test table. Then, use the detachable fastener provided with the test table to stably fix the middle section of the core on the test table. Then, use the limiting structure on both sides of the test table to limit the core in both directions, so that the core always remains flat and in a close fit during the subsequent pressure application process. This avoids the test deviation caused by the core displacement from a physical point of view, laying the foundation for the accurate implementation of all subsequent test steps.

[0037] Standardized test parameter settings are performed on the data processing unit's interface. First, surface pressure simulation is selected in the scenario options. Then, the values ​​for pressure application range, pressure increase rate, data acquisition frequency, and number of test cycles are entered precisely. The pressure application range is 0~100N, the pressure increase rate is 1N / s, the data acquisition frequency is 10Hz, and the number of test cycles is 3. After completing the initial input of all parameters, the overall parameters are checked and confirmed a second time. Once confirmed to be correct, a parameter locking command is triggered to fix all test parameters, preventing parameter misadjustment during subsequent tests. The data processing unit then transmits all locked test parameters to the pressure application unit via a high-speed data transmission link. Figure 1 As shown, this ensures that subsequent operations of the pressure application unit fully match the preset test standards.

[0038] The electromagnetic shielding cover of the operating laboratory opens and closes slowly until it completely covers the entire test area of ​​the fiber optic cable fabric test core. At the same time, the connection points between the optical emitting unit, the optical receiving unit and the core are also included in the shielding range, forming a fully enclosed test space. This effectively isolates electromagnetic interference generated by other optical testing instruments and electrical equipment inside the laboratory, allowing subsequent optical data acquisition to be conducted in a clean and interference-free environment.

[0039] The data processing unit sends a start command to the pressure application unit, which then applies surface pressure to the core uniformly at a preset pressure increase rate. The surface pressure application process remains stable and without fluctuations. Simultaneously, the data acquisition unit starts working, continuously acquiring the refractive index data of the core's reflective layer through its built-in fiber optic refractive index detection component, and simultaneously acquiring the core's reflected optical power data through its optical receiving unit. These two types of raw data are transmitted in real-time to the signal processing component of the data acquisition unit, where amplification and filtering preprocessing operations are performed sequentially to effectively filter out noise signals in the data. The preprocessed data is then transmitted to the data processing unit via a stable wired transmission link. Figure 2 As shown, during the continuous application of pressure, the pressure application unit acquires the current applied pressure value in real time, and accurately synchronizes and marks the real-time pressure value with the refractive index data and optical power data collected at the same time, so that the pressure data and optical data form a one-to-one correspondence. The marked real-time pressure value is transmitted to the data processing unit along with the two types of optical data to ensure the correlation and accuracy of subsequent data processing.

[0040] The data processing unit receives pre-processed refractive index data of the reflective layer, reflected light power data, and synchronously marked real-time pressure values ​​in real time. It integrates all received data in a time-series manner, creating a clear temporal relationship between pressure and optical data at different time points. Then, it retrieves a preset 50N operating pressure value and precisely matches the refractive index data of the reflective layer collected under this pressure value. Using a refractive index threshold calibration formula, it accurately compares the refractive index data with a preset refractive index threshold and completes the calibration, ensuring that the refractive index data under this operating pressure more closely matches the actual optical performance of the core. The refractive index threshold calibration formula is as follows: ,in, The refractive index value of the reflective layer under calibrated pressure of 50N. The data collected includes the refractive index of the reflective layer under a pressure of 50N. The refractive index threshold of the reflective layer of this type of optical fiber cable fabric under 50N pressure is determined by the manufacturer of the optical fiber cable fabric. To test the refractive index baseline value of the core under initial pressureless conditions, data was acquired through a data acquisition unit after positioning. Based on the calibrated refractive index data of the reflective layer, the data processing unit plotted a pressure-refractive index-optical power linkage curve within a pressure range of 0-100N, with pressure value as the abscissa and refractive index value and optical power value as the ordinates. This curve visually reflects the changes in the optical performance of the core under different pressures. The data processing unit transmitted the calibrated data and the plotted linkage curve to the display unit in real time. The display unit clearly displayed the real-time pressure value, refractive index value, and optical power value in digital form, and presented the linkage curve in a dynamic graphical format, facilitating real-time observation of the testing process and data changes. Simultaneously, the data processing unit transmitted the integrated raw data, calibrated data, refractive index threshold calibration results, and linkage curve data to a data server for unified classification and storage, ensuring the integrity and traceability of the test data.

[0041] The data processing unit uses the pressure-refractive index-optical power linkage characteristic fitting formula to fit the eigenvalues ​​of the plotted linkage curve, obtaining linkage characteristic parameters that reflect the correlation between core pressure and optical performance. The pressure-refractive index-optical power linkage characteristic fitting formula is as follows: ,in, This is a linked characteristic parameter of pressure, refractive index, and optical power. The refractive index correlation coefficient is determined by the linear correlation between the calibrated refractive index data of the reflective layer and the pressure value. The refractive index value of the reflective layer under calibrated pressure of 50N. The optical power correlation coefficient is determined by the linear correlation between the collected real-time reflected optical power data and the pressure value. For the real-time reflected light power data collected, The fundamental constants for the linkage characteristics are determined by the inherent optical properties of the braided layer of the fiber optic cable fabric test core, and are inherent calibration parameters at the time of production of the fiber optic cable fabric. Transmitting these linkage characteristic parameters to the display unit and displaying them along with existing data and graphics allows for a more accurate grasp of the core's core optical characteristics. Simultaneously, the linkage characteristic parameters are stored in the data server, completing the storage and retention of all test data. Figure 3 As shown.

[0042] When the pressure applied to the core by the pressure application unit reaches the preset pressure of 100N, it immediately sends a pressure compliance signal to the data processing unit. Upon receiving this signal, the data processing unit immediately sends a pressure relief command to the pressure regulating unit. The pressure regulating unit then smoothly executes the pressure relief operation, maintaining a uniform rate to avoid structural damage to the core due to excessively rapid pressure relief. Once the reflective layer of the fiber optic cable fabric test core has completely returned to its initial pressure-free state, this single test is complete. Subsequently, according to the preset number of test cycles, the entire process of pressure application, data acquisition, data processing, and pressure relief is automatically repeated. Multiple test cycles effectively avoid the random errors of a single test, making the test results more objective and reliable. After all three test cycles are completed, the data processing unit sends the data to the data server. A data retrieval command is sent to retrieve the full calibration data and linkage characteristic parameters from the server for three tests. After integrating and analyzing similar data, a test average data report is generated. The test average data report comprehensively reflects the refractive index pressure performance of the core's pressure-bearing reflective layer. The average data report is then stored on the data server, achieving integrated storage of test data and reports. Subsequently, when exporting data through the data server's operating terminal, the original test data, calibration data, linkage curve data, and average data report to be exported are selected according to the requirements for compiling the factory quality inspection report. All selected data are exported through the data server's standard export interface. The exported data can be directly used for compiling the factory quality inspection report, providing accurate and comprehensive technical data support for the factory quality judgment of batch cores.

[0043] In summary, in the constant temperature and humidity optical testing environment of fiber optic cable fabric manufacturers, a complete set of pressure testing operations on the refractive index of the pressure-reflective layer of polyester fiber braided fiber optic cable fabric test cores was completed. From the precise docking and positioning of the fiber optic cable fabric test cores to the final export of test data, a standardized operating procedure was formed. Multiple rounds of cyclic testing effectively avoided the random errors of single tests. All types of test data were fully stored and exported as needed. The obtained test data and average data reports can directly provide accurate and comprehensive technical data support for the factory quality judgment of fiber optic cable fabric test cores, ensuring that the performance of finished products meets the standards.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A system for testing the refractive index pressure of a pressure-reflective layer in an optical fiber cable fabric, characterized in that, The system includes: Connection and positioning module: The fiber optic cable fabric test core is laid and fixed on the test platform of the pressure application unit, and the positioning is completed by the limiting structure. The two ends are respectively connected to the optical emitting unit and the optical receiving unit. Parameter configuration module: Sets unified test parameters through the data processing unit, determines the test scenario, input pressure application range, pressure increase rate, data acquisition frequency and test cycle number, and transmits the test parameters to the pressure application unit; Pressure acquisition module: The electromagnetic shielding cover covers the test area of ​​the fiber optic cable fabric test core, sends a start command to the pressure application unit, applies surface pressure to the fiber optic cable fabric test core according to the pressure increase rate, and collects the refractive index data of the reflective layer and the reflected light power data. After preprocessing, the data is transmitted to the data processing unit. Analysis and transmission module: The data processing unit receives the preprocessed refractive index data and reflected light power data of the reflective layer, retrieves the preset working pressure value, compares the refractive index data of the reflective layer collected under the pressure with the preset refractive index threshold of the reflective layer and completes the calibration, plots the pressure-refractive index-light power linkage curve based on the calibrated data, and then transmits the calibrated data and linkage curve to the display unit for visualization display, while storing each data. Cyclic Export Module: When the pressure applied by the pressure application unit reaches the target pressure, a pressure relief operation is performed until the reflective layer of the fiber optic cable fabric test core returns to its initial pressure-free state, completing a single test. Then, according to the number of test cycles, after completing the cyclic test, a test average data report is generated and stored in the data server, which can be exported through the data server's export interface.

2. The optical fiber cable fabric refractive index pressure testing system according to claim 1, characterized in that, In the connection and positioning module, the two ends of the fiber optic cable fabric test core are respectively connected to the output end of the optical transmitting unit and the input end of the optical receiving unit to complete the connection between the fiber optic cable fabric test core and the optical transmitting unit and the optical receiving unit. The middle section of the connected fiber optic cable fabric test core is then laid flat on the test table surface of the pressure application unit, and its position is adjusted to align with the positioning marks on the test table. The middle section of the fiber optic cable fabric test core is fixed on the test table using a detachable fixing method, and then positioned by a limiting structure.

3. The optical fiber cable fabric refractive index pressure testing system according to claim 1, characterized in that, In the parameter configuration module, when setting test parameters, the user sequentially selects the test scenario as surface pressure simulation, the input pressure application range as 0~100N, the pressure increase rate as 1N / s, the data acquisition frequency as 10Hz, and the number of test cycles as 2~4 times in the operation interface of the data processing unit. After completing the initial setting of all test parameters, the user performs overall confirmation. After confirmation, a parameter locking command is triggered to fix the test parameters. Then, the locked test parameters are transmitted to the pressure application unit through the data transmission link.

4. The optical fiber cable fabric refractive index pressure testing system according to claim 1, characterized in that, In the pressure acquisition module, the electromagnetic shielding cover is activated, causing it to close downwards until it completely covers the test area of ​​the fiber optic cable fabric test core and the connection points between the optical emitting unit, the optical receiving unit, and the fiber optic cable fabric test core, thus sealing the test area. Then, the data processing unit sends a start command to the pressure application unit, applying surface pressure to the fiber optic cable fabric test core according to the pressure increase rate in the test parameters. Simultaneously, the data acquisition unit is activated, acquiring the refractive index data of the reflective layer of the fiber optic cable fabric test core through the built-in fiber refractive index detection component and the reflected light power data of the fiber optic cable fabric test core through the optical receiving unit. These data are then pre-processed by amplification and filtering before being transmitted to the data processing unit via a wired transmission link. Furthermore, during the application of surface pressure to the fiber optic cable fabric test core, the pressure application unit continuously acquires the real-time applied pressure value, synchronously marking the real-time pressure value along with the reflective layer refractive index data and the reflected light power data, and then transmitting the marked real-time pressure value to the data processing unit.

5. The optical fiber cable fabric refractive index pressure testing system according to claim 1, characterized in that, In the analysis and transmission module, the data processing unit receives preprocessed reflective layer refractive index data, reflected optical power data, and synchronously marked real-time pressure values. It integrates these data according to a time series, retrieves a preset 50N operating pressure value, matches it with the reflective layer refractive index data collected under that pressure, and compares the reflective layer refractive index data with a preset refractive index threshold using a refractive index threshold calibration formula to complete the calibration. Based on the calibrated reflective layer refractive index data, it plots a pressure-refractive index-optical power linkage curve within the 0~100N pressure range, with pressure value as the abscissa and refractive index value and optical power value as the ordinates. The calibrated data and the plotted linkage curve are then transmitted to the display unit for visualization. Simultaneously, the integrated data, calibrated data, refractive index threshold calibration results, and linkage curve data are stored through a data server.

6. The optical fiber cable fabric refractive index pressure testing system according to claim 5, characterized in that, The refractive index threshold calibration formula in the analysis transmission module is: ,in, The refractive index value of the reflective layer under calibrated pressure of 50N. The data collected includes the refractive index of the reflective layer under a pressure of 50N. This represents the refractive index threshold of the reflective layer of this type of optical fiber cable fabric under 50N pressure. To obtain the reference value of the refractive index of the core under the initial pressureless state, the data was acquired by connecting to the data acquisition unit after positioning.

7. The optical fiber cable fabric refractive index pressure testing system according to claim 5, characterized in that, In the analysis and transmission module, after receiving the calibrated data and the linkage curve, the display unit displays the real-time pressure value, real-time refractive index value, and real-time optical power value in digital form through the display interface, and displays the pressure-refractive index-optical power linkage curve in graphical form through the display interface. The data processing unit performs eigenvalue fitting on the plotted linkage curve using the pressure-refractive index-optical power linkage feature fitting formula, obtains the linkage feature parameters, and displays the linkage feature parameters along with the numbers and graphs on the display interface. At the same time, the linkage feature parameters are stored in the data server.

8. The optical fiber cable fabric refractive index pressure testing system according to claim 7, characterized in that, In the analysis and transmission module, the fitting formula for the pressure-refractive index-optical power linkage feature is: ,in, This is a linked characteristic parameter of pressure, refractive index, and optical power. The refractive index correlation coefficient is determined by the linear correlation between the calibrated refractive index data of the reflective layer and the pressure value. The refractive index value of the reflective layer under calibrated pressure of 50N. The optical power correlation coefficient is determined by the linear correlation between the collected real-time reflected optical power data and the pressure value. For the real-time reflected light power data collected, These are the fundamental constants for linkage characteristics.

9. The optical fiber cable fabric refractive index pressure testing system according to claim 1, characterized in that, In the cycle export module, when the pressure applied by the pressure application unit reaches 100N, a pressure compliance signal is sent to the data processing unit. Based on the pressure compliance signal, the data processing unit sends a pressure relief command to the pressure regulating unit. After receiving the pressure relief command, the pressure regulating unit performs the pressure relief operation. The cycle test is repeated according to the number of test cycles. After the cycle test is completed, the data processing unit sends a data retrieval command to the data server to retrieve the full calibration data and linkage characteristic parameters of the cycle test, generates an average data report of the cycle test, and stores it in the data server.

10. A method for testing the refractive index of a pressure-reflective layer in an optical fiber cable fabric, the method being applicable to the pressure testing system for the refractive index of a pressure-reflective layer in an optical fiber cable fabric as described in any one of claims 1-9, characterized in that, The specific steps of this method are as follows: Connection and positioning: The fiber optic cable fabric test core is laid and fixed on the test platform of the pressure application unit, and the positioning is completed by the limiting structure. The two ends are respectively connected to the optical emitting unit and the optical receiving unit. Parameter configuration: Set unified test parameters through the data processing unit, determine the test scenario, input pressure application range, pressure increase rate, data acquisition frequency and test cycle number, and transmit the test parameters to the pressure application unit; Pressure acquisition: The electromagnetic shielding cover is activated to cover the test area of ​​the fiber optic cable fabric test core. A start command is sent to the pressure application unit to apply surface pressure to the fiber optic cable fabric test core according to the pressure increase rate. The refractive index data of the reflective layer and the reflected light power data are collected and transmitted to the data processing unit after preprocessing. Analysis and transmission: The data processing unit receives the preprocessed refractive index data and reflected light power data of the reflective layer, retrieves the preset working pressure value, compares the refractive index data of the reflective layer collected under this pressure with the preset refractive index threshold of the reflective layer and completes the calibration, plots the pressure-refractive index-light power linkage curve based on the calibrated data, and then transmits the calibrated data and linkage curve to the display unit for visualization display, while storing each data. Cyclic Export: When the pressure applied by the pressure application unit reaches the target pressure, a pressure relief operation is performed until the reflective layer of the fiber optic cable fabric test core returns to its initial pressure-free state, completing a single test. Then, according to the number of test cycles, after completing the cyclic test, a test average data report is generated and stored in the data server, which can be exported through the data server's export interface.

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