A marine turbidity sensor pressure ratio measuring device and method

Abstract

The application discloses a kind of marine turbidity sensor pressure ratio measuring device and testing method, device includes hydrostatic test system, pressure turbidity ratio measuring device and measured turbidity sensor;Pressure turbidity ratio measuring device includes sealed cabin, pressure balance component, stirring component, internal pressure monitoring component and mounting base, pressure balance component realizes pressure balance inside and outside cabin by volume change, stirring component makes turbidity solution uniform suspension, internal pressure monitoring component is used to monitor the real-time pressure in sealed cabin, measured turbidity sensor includes at least one high-precision standard turbidity sensor and at least one low-precision compared turbidity sensor.The method includes normal pressure pretest, pressure stirring measurement with pressure, decompression and comparative analysis.This application solves the problem that existing turbidity sensor can only be measured under normal pressure, and cannot carry out "pressure-turbidity" combined parameter traceability under simulated deep-sea pressure, with the characteristics of simple structure, strong compatibility and accurate testing.

Description

Technical Field

[0001] This invention relates to the field of performance testing technology for marine chemical instruments, and in particular to a pressure comparison device and method for a marine turbidity sensor. Background Technology

[0002] The principle of traceability of marine turbidity sensors is to use a certain standard substance as a carrier of measurement values, and establish the correlation between the sensor and the national standard through calibration or comparative measurement. At the same time, environmental interference such as high salinity and temperature is eliminated through marine-specific processes and data calculation models. Ultimately, the measurement values ​​of marine turbidity sensors can be traced back to international or national turbidity standards, and the corrected values ​​of the actual measurements of the sensors are given.

[0003] In the metrological assurance system of marine turbidity sensors, calibration and comparative testing are two core operations. Calibration establishes a quantitative correlation between the sensor and standard values, while comparative testing verifies the consistency, accuracy, or applicability of the sensor's measurements. These two operations have clear boundaries in terms of purpose, standard requirements, and operational logic. Calibration uses standard materials traceable to national or international turbidity benchmarks. Under controlled conditions, it establishes a quantitative relationship between the sensor's "measured value" and the "standard turbidity value" through multi-point measurements, clarifies the sensor's systematic errors, and ultimately achieves metrological traceability. Comparative testing, under laboratory conditions, involves simultaneously measuring the marine turbidity sensor to be evaluated against a calibrated reference standard (such as a high-precision standard turbidimeter). By comparing the measurement results, the consistency, accuracy, or applicability of the sensor's measurements is verified, and a pass / fail judgment or deviation assessment is made.

[0004] Traditional performance testing of marine turbidity sensors involves using seawater as the test medium under normal atmospheric pressure. Standard substances or standard particles are added to the seawater to create a fixed liquid test environment. The sensor under test is then placed in this environment, and the standard values ​​of the solution are measured. The test difference is calculated using a formula and fed back to the application customer to generate a test report.

[0005] However, with the development of deep-sea applications in recent years, the industry has found that turbidity data measured based on normal atmospheric pressure exhibits significant deviations under deep-sea pressure conditions, failing to accurately reflect real-time measurement data in the deep-sea environment. Traditional turbidity sensors using normal atmospheric pressure measurement are no longer suitable for deep-sea conditions, exhibiting the following problems or shortcomings: 1) Traditional testing methods are unsuitable: Traditional turbidity sensor testing methods use a normal laboratory atmospheric environment as the testing background, and the correction coefficients they provide are only applicable to atmospheric pressure or water depths of less than 100m. When the turbidity sensor is used at a depth greater than 100m, the correction values ​​provided by traditional testing methods deviate and cannot meet the correction requirements in deep-water environments.

[0006] 2) Traditional sea trial comparison methods are unsuitable: Traditional sea trial comparison methods for turbidity sensors involve simultaneously deploying multiple turbidity sensors aboard a deep-sea platform to the seabed, measuring underwater turbidity parameters together, and then using a high-precision sensor as a benchmark to provide the real-time underwater measurements from the other sensors, calculated using a weighted average. However, if depth already affects the performance of the turbidity sensors, this method cannot eliminate deviations, and the error of each sensor under deep-sea conditions is unknown, meaning the obtained measurement data may still be erroneous.

[0007] 3) Lack of testing equipment: Traditional turbidity sensor testing methods involve testing low-accuracy sensors with high-accuracy standard substances under normal atmospheric conditions in a laboratory, then providing the true and corrected values. However, in deep-sea conditions, pressure factors can affect the accuracy of this testing process, thus requiring a testing device that incorporates pressure parameters. Currently, the industry lacks a suitable testing device, representing a gap in equipment availability.

[0008] 4) Inadequate test data calculation model: Traditional turbidity sensor traceability methods use standard substances as the true value to transmit to the test sensor and establish a corresponding relationship model, then calculate correction values. However, current mathematical calculation models do not incorporate pressure parameters, thus only applicable to atmospheric pressure environments or water depths within 100m. To accurately reflect correction results under deep-sea conditions, pressure factors need to be added to the data calculation model to provide correction values ​​under different pressure conditions at different depths, thereby improving test accuracy.

[0009] Therefore, there is an urgent need for a device and method that can trace the joint parameters of turbidity sensors based on pressure and turbidity under simulated deep-sea pressure conditions. Summary of the Invention

[0010] To address the problems existing in the prior art, this invention provides a pressure comparison device and testing method for marine turbidity sensors. It features a simple structure, convenient manufacturing, accurate and rapid testing, and good reproducibility. It fundamentally solves the problem of the lack of turbidity pressure comparison devices and testing methods in the field of performance testing of marine chemical instruments in my country. It improves upon the unsuitability of traditional testing methods, the unsuitability of traditional sea trial comparison methods, the lack of testing devices, and the unreasonable calculation models for test data, providing a new means for performance testing of marine chemical instruments.

[0011] This invention is achieved using the following technical solution: a marine turbidity sensor with pressure ratio measurement device, comprising: A hydrostatic testing system is used to provide a simulated deep-sea pressure environment; A pressure turbidity ratio measuring device is installed within the water pressure test system; The turbidity sensor to be measured is installed inside the pressurized turbidity comparison device; The pressurized turbidity comparator includes a sealed chamber, a pressure balancing assembly, a stirring assembly, an internal pressure monitoring assembly, and a mounting base. The sealed chamber is formed by a sealed connection of an upper end cover, a main chamber of the turbidity device, and a lower end cover. The pressure balancing assembly is installed at the bottom of the lower end cover, and its interior communicates with the sealed chamber. It can balance the pressure inside and outside the sealed chamber through volume changes under external pressure. The stirring assembly includes a pressure-resistant servo motor and a stirring paddle. The pressure-resistant servo motor is installed at the bottom of the lower end cover and drives the stirring paddle located inside the sealed chamber through a linkage bearing. The internal pressure monitoring assembly includes a pressure sensor and a sensor cover for protecting the pressure sensor. The pressure sensor is installed at the top of the upper end cover and is used to monitor the real-time pressure inside the sealed chamber. The mounting base is located at the bottom of the sealed chamber and is used to support the sealed chamber and house and protect the pressure balancing assembly and the stirring assembly. The turbidity sensor to be measured includes at least one high-precision standard turbidity sensor and at least one low-precision turbidity sensor to be compared. The pressure sensor, the high-precision standard turbidity sensor, and the low-precision turbidity sensor to be compared are respectively led out to the terminal data analyzer through pressure-resistant data cables.

[0012] In the above technical solution, preferably, the pressure sensor cover, pressure sensor, upper cover, turbidity device main chamber, mounting base, pressure balance component, pressure-resistant servo motor, lower cover and stirring paddle are all detachable structures, which can change the effective space of the sealed chamber according to the size of different water pressure test systems.

[0013] In the above technical solution, preferably, the pressure sensor cover, pressure sensor, upper cover, turbidity device main chamber, mounting base, pressure balance component, pressure-resistant servo motor, lower cover and stirring paddle are all detachable structures, which can change the effective space of the sealed chamber according to the size of different turbidity sensors being measured, and by increasing the number of pressure-resistant data cables at the upper cover, multiple sensors can be measured simultaneously.

[0014] In the above technical solution, preferably, the pressure balancing component is a pressure-resistant balancing rubber bladder with adjustable volume. Adjusting its volume enables the pressurized turbidity ratio measuring device to be suitable for different water pressure testing ranges, and can be extended to a full ocean depth environment of 110MPa.

[0015] In the above technical solution, preferably, the pressure-resistant servo motor and the stirring paddle are of adjustable speed, which can realize continuous speed change in the range of 0 to 300 r / min under pressure, and adapt to the testing requirements of different turbidity standard particles.

[0016] The present invention also provides a method for measuring the pressure ratio of a marine turbidity sensor using the above-mentioned pressure ratio measuring device, comprising the following steps: S1. Under normal pressure, the turbidity sensor under test is placed in the normal pressure test area of ​​the standard solution to perform normal pressure performance testing and traceability, obtain basic background data and store it in the terminal data analyzer. S2. Place the turbidity sensor under test back into the sealed chamber of the pressure-controlled turbidity comparison device, and inject the same seawater turbidity reagent as in step S1. Adjust the pressure-resistant servo motor to select a stirring speed that is consistent with the turbidity of the solution suspension under normal pressure. Then turn off the pressure-resistant servo motor to complete the sealing of the pressure-controlled turbidity comparison device. Place it together with the multiple turbidity sensors inside into the water pressure test system, and lead out each pressure-resistant data cable to the terminal data analyzer. S3. Use a hydrostatic test system to simulate underwater pressure environments at different depths and apply predetermined pressure values ​​step by step. At each predetermined pressure value, the pressure sensor is activated to confirm the internal pressure of the pressurized turbidity comparator. Then, the pressure-resistant servo motor is started to drive the stirring paddle to homogenize the internal test solution. After the stirring stabilizes, the turbidity sensor under test is activated to measure real-time data, and the data is transmitted and stored to the terminal data analyzer through each pressure-resistant data cable. After the measurement of the current pressure value is completed, the pressure-resistant servo motor is turned off, and the pressure is increased to the next predetermined pressure value. This step is repeated until the measurement under all predetermined pressure value conditions is completed. S4. Reduce the pressure in the water pressure test system to normal pressure, and remove the pressurized turbidity comparison device and the turbidity sensor to be measured. S5. Compare and analyze the atmospheric pressure test data and the pressure test data stored in the terminal data analyzer to generate a turbidity sensor pressure comparison test data report.

[0017] In the above technical solution, preferably, in step S3, the depth range simulated by the water pressure test system is 0 to 6000m, the corresponding pressure range is from atmospheric pressure to 60MPa, and the simulated pressure can be extended to 110MPa by increasing the volume adjustment range of the pressure balance component.

[0018] In the above technical solution, preferably, in step S3, the stirring stabilization time is 5 minutes.

[0019] In the above technical solution, preferably, in step S3, after turning on the pressure sensor, the measured pressure value is first compared with the pressure value displayed by the water pressure test system itself, and after confirming that there is no deviation, the pressure-resistant servo motor is started to stir.

[0020] In the above technical solution, preferably, the resolution of the high-precision standard turbidity sensor is three times higher than that of the low-precision turbidity sensor.

[0021] The advantages and positive effects of this invention are: 1. This invention adopts a traditional mechanical structure and pressure-resistant sealing structure design concept, mainly composed of a pressure sensor cover, pressure sensor, upper end cover, turbidity device main chamber, mounting base, pressure-resistant balance rubber bladder, pressure-resistant servo motor, lower end cover, and three-bladed agitator. Each part is a standardized component, and the overall integration solves problems such as the unsuitability of traditional testing methods, the unsuitability of traditional sea trial comparison methods, the lack of testing devices, and unreasonable test data calculation models. It provides a new means for marine testing institutions in my country to comprehensively test the performance of chemical parameter sensors.

[0022] 2. All components of this invention are industrial-grade products. The pressure sensor and servo motor are mature industrial products, sealed and pressure-resistant by an external pressure-resistant housing. No special customized parts are required, resulting in a simple structure that is readily available in the market. Assembly is quick and convenient, facilitating maintenance, disassembly, and cleaning. It is also easy to transport and can be used in the hydrostatic test chambers of various testing institutions.

[0023] 3. All metal components of this invention are made of 316L stainless steel, which has strong resistance to seawater corrosion and high device reliability. Neither the pressure sensor nor the pressure-resistant servo motor directly bears external pressure, eliminating the risk of overpressure damage. The pressure-resistant servo motor and the pressure-resistant housing are assembled together; during use, the housing is immersed in the water medium of the hydrostatic test chamber, enabling efficient heat dissipation and preventing overheating-induced malfunctions. Furthermore, the pressure sensor and pressure-resistant servo motor can be traced for pressure accuracy and speed performance, ensuring high accuracy during operation.

[0024] 4. The dimensions of the main chamber, upper cover, and lower cover of the turbidity device included in this invention can be flexibly scaled and adjusted according to the dimensions of the hydrostatic test chambers of different hydrostatic testing institutions. Other components can be assembled and used without major modifications. Furthermore, by increasing the volume of the pressure-balancing rubber bladder, the balance pressure range can be expanded to a maximum of 110 MPa. This basically meets the usage needs of various domestic chemical testing institutions equipped with hydrostatic test chambers, and has strong spatial compatibility.

[0025] 5. The pressure-resistant servo motor installed on the lower end cover of the pressurized turbidity comparison device of the present invention is a high-torque DC motor, which can achieve a continuous speed adjustment range of 0~300 r / min under pressure conditions, and the stirring speed of the test medium is controllable. During the test, the speed can be adjusted according to the required suspension turbidity of the internal medium to achieve uniform stirring. When the density of the medium changes, it can also be adjusted accordingly to meet the control requirements.

[0026] 6. In this invention, formalin granules can be used as standard turbidity particles. These particles are characterized by high pressure resistance, high stability, and low water solubility. During the experiment, the amount added can be controlled according to the effective space inside the main chamber of the turbidity device to achieve different test turbidity (concentration) requirements. In addition, other stable, pressure-resistant, and seawater-insoluble particulate media can also be selected as turbidity standard particles, making the turbidity range of the test medium of this device flexible and controllable. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some specific embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall system of the marine turbidity sensor with pressure comparison device in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the pressure turbidity comparison device in Embodiment 1 of the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Hydrostatic test chamber; 2. Sealed end cap; 3. Pressure-resistant pipeline; 4. Pressure gauge; 5. Pressure control system; 6. Turbidity comparator under pressure; 7. Turbidity sensor; 8. Pressure-resistant data cable; 9. Terminal data analyzer; 10. Pressure sensor cover; 11. Pressure sensor; 12. Upper end cap; 13. Main chamber of turbidity device; 14. Mounting base; 15. Pressure-resistant balance rubber bladder; 16. Pressure-resistant servo motor; 17. Lower end cap; 18. Agitator; 19. Sensor suspension terminal. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "b," and "c" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example 1 Please see Figure 1 and Figure 2 This embodiment provides a pressure comparison device for a marine turbidity sensor, including a water pressure test system, a pressure turbidity comparison device, and a turbidity sensor to be measured.

[0034] The hydrostatic testing system is the fundamental equipment for simulating deep-sea pressure environments, providing a pressure simulation environment of 0–6000 m for the pressurized turbidity comparator 6. It includes a hydrostatic testing chamber 1, a sealed end cap 2, pressure-resistant pipelines 3, a pressure gauge 4, and a pressure control system 5. The sealed end cap 2 seals the hydrostatic testing chamber 1, the pressure gauge 4 monitors the pressure within the hydrostatic testing system, and the pressure control system 5 is connected to the hydrostatic testing system via the pressure-resistant pipelines 3 to regulate the pressure within the system. In this embodiment, the pressure testing chamber 1, upon which the hydrostatic testing system relies, can withstand a maximum pressure of 140 MPa, has an effective space of Φ0.8 m × 2 m, and the pressure gauge 4 has a control accuracy of 0.4%FS. Other domestic chemical testing institutions (laboratories) with similar hydrostatic testing chambers 1, as long as their dimensions can accommodate the pressurized turbidity comparator 6 and the pressure is higher than 60 MPa, can achieve the same purpose without affecting the normal operation of the pressurized turbidity sensor's comparability testing.

[0035] The pressurized turbidity comparator 6 is installed within the hydrostatic testing system. It includes a sealed chamber, a pressure balancing assembly, a stirring assembly, an internal pressure monitoring assembly, a mounting base 14, and a terminal data analyzer 9. The sealed chamber is formed by a sealed connection of an upper cover 12, a main chamber 13 for the turbidity device, and a lower cover 17, creating a sealed environment. Seawater turbidity solution is placed inside to form the main test environment. The pressure balancing assembly is installed at the bottom of the lower cover 17, communicating with the sealed chamber internally. Under external pressure, it balances the pressure inside and outside the sealed chamber through its own volume change (i.e., the pressure inside the sealed chamber is balanced with the pressure inside the hydrostatic testing chamber), achieving consistent test pressure control. The stirring assembly includes a pressure-resistant servo motor 16 and a stirring paddle 18. The pressure-resistant servo motor 16 is installed at the bottom of the lower cover 17 and drives the stirring paddle 18 located inside the sealed chamber via a linkage bearing. This stirring agitates the internal seawater turbidity medium, ensuring uniform suspension of the turbidity standard particles. The stirring paddle 18 can be a three-bladed type. The internal pressure monitoring assembly includes a pressure sensor 11 and a sensor cover 10 for protecting the pressure sensor 11. The pressure sensor 11 is mounted on the top of the upper end cover 12 and is used to monitor the real-time pressure inside the sealed chamber, exporting this value to the terminal data analyzer 9 for data calculation. The pressure sensor cover 10 ensures the pressure sensor 11 is pressure-resistant and sealed. The mounting base 14 is located at the bottom of the sealed chamber and is used to support the sealed chamber and house and protect the pressure balancing assembly and the stirring assembly.

[0036] The turbidity sensor 7 includes at least one high-precision standard turbidity sensor and at least one low-precision comparison turbidity sensor, housed inside the pressurized turbidity comparison device 6. The pressure sensor 11, high-precision standard turbidity sensor, and low-precision comparison turbidity sensor are each connected to the terminal data analyzer 9 via pressure-resistant data cables 8. The high-precision standard turbidity sensor and the low-precision comparison turbidity sensor are suspended via sensor suspension terminals 19. Both domestically produced and imported turbidity sensors are acceptable. The high-precision standard sensor, after undergoing "routine laboratory traceability - pressurized testing - secondary routine laboratory traceability," serves as the standard reference value for comparison, while the low-precision comparison sensor serves as the object instrument being compared.

[0037] In this embodiment, the device's range covers 0–60 MPa, with an effective test space diameter of 300 mm and a height of 300 mm, allowing simultaneous testing of three sets of sensors. This device has broad applicability to chemical testing institutions (laboratories) across China equipped with hydrostatic testing chambers. Utilizing a hydrostatic testing system to simulate different deep-sea underwater pressure environments, continuous turbidity parameter measurements are conducted within the pressurized turbidity comparison device 6, ultimately generating linear analysis results. This verifies the consistency of the three turbidity sensors under high-pressure conditions and provides the traceability coefficient of the low-precision compared turbidity sensor under pressurized conditions. To meet the comparison requirements, the resolution of the high-precision standard turbidity sensor should generally be more than three times higher than that of the low-precision compared turbidity sensor.

[0038] Through the above structure, this invention integrates a hydrostatic testing system, a pressurized turbidity comparison device, and the turbidity sensor under test into a single unit, creating a testing platform capable of synchronously comparing turbidity sensors under simulated deep-sea high-pressure environments in a laboratory setting. The pressure balancing component achieves pressure balance inside and outside the sealed chamber, ensuring that the turbidity sensor under test withstands realistic simulated deep-sea pressure; the stirring component ensures uniform suspension of turbidity standard particles under high pressure, eliminating the interference of sedimentation on measurement results; and the internal pressure monitoring component monitors the pressure inside the sealed chamber in real time, providing accurate pressure parameters for data calculation. This device fundamentally solves the problems lacking in traditional testing devices.

[0039] In a preferred embodiment, the pressure sensor cover 10, pressure sensor 11, upper cover 12, turbidity device main chamber 13, mounting base 14, pressure balancing assembly, pressure-resistant servo motor 16, lower cover 17, and stirring paddle 18 are all detachable structures, allowing the effective space of the sealed chamber to be adjusted according to the size of different hydrostatic testing systems. In this embodiment, through the detachable design of each component, the size of the sealed chamber can be flexibly scaled and adjusted with reference to the size of the hydrostatic testing chamber 1 of different hydrostatic testing mechanisms, and other components can be assembled and used without major modifications. This makes the present invention applicable to basic hydrostatic testing platforms in different laboratories, exhibiting good versatility and compatibility.

[0040] In a preferred embodiment, the pressure sensor housing 10, pressure sensor 11, upper cover 12, turbidity device main chamber 13, mounting base 14, pressure balancing assembly, pressure-resistant servo motor 16, lower cover 17, and stirring paddle 18 are all detachable structures. This allows for adjustments to the effective space of the sealed chamber based on the size of different turbidity sensors being measured. Furthermore, by increasing the number of pressure-resistant data cables 8 at the upper cover 12, simultaneous measurement by multiple sensors can be achieved, increasing the efficiency of a single test. In this embodiment, the detachable structure allows for adjustment of the internal space of the sealed chamber according to the size of different turbidity sensors. Simultaneously, multiple pressure-resistant data cable 8 interfaces can be provided on the upper cover 12, enabling simultaneous measurement by multiple sensors and significantly improving the efficiency of a single test and the applicability of the device.

[0041] In a preferred embodiment, the pressure balancing component is a pressure-resistant balancing rubber bladder 15 with adjustable volume. Adjusting its volume allows the pressurized turbidity comparator 6 to be adapted to different water pressure testing ranges, up to a maximum of 110 MPa in a full ocean depth environment. In this embodiment, the pressure-resistant balancing rubber bladder 15 is installed at the bottom of the lower end cap 17 and is internally connected to the main chamber 13 of the turbidity device. When the external pressure changes, the pressure-resistant balancing rubber bladder 15 achieves pressure balance by changing its own volume. By selecting different volume specifications or increasing the volume adjustment range of the pressure-resistant balancing rubber bladder 15 to adapt to different water pressure testing ranges, the balancing pressure can be extended up to 110 MPa, corresponding to a full ocean depth environment.

[0042] In a preferred embodiment, the pressure-resistant servo motor 16 and the stirring paddle 18 are of adjustable speed, enabling continuous speed variation within the range of 0–300 r / min under pressure, adapting to testing requirements using standard particles of different turbidity. In this embodiment, the pressure-resistant servo motor 16 is a high-torque DC motor, capable of continuous speed adjustment within the range of 0–300 r / min under pressure, adapting to testing applications using standard particles of different turbidity. During the experiment, the speed can be precisely adjusted according to the suspension turbidity requirements of the internal medium and the sedimentation characteristics of standard particles of different turbidity, thereby achieving uniform stirring. When the medium density changes, the speed can also be changed accordingly to meet the control requirements of various testing conditions.

[0043] Example 2 A method for measuring the pressure ratio of a marine turbidity sensor using the aforementioned pressure ratio measurement device includes the following steps: S1. Under normal pressure, the turbidity sensor 7 to be measured is placed in the normal pressure test area of ​​the standard solution to perform normal pressure instrument performance testing and traceability, obtain basic background data and store it in the terminal data analyzer 9. S2. Place the turbidity sensor 7 to be measured back into the sealed chamber of the pressurized turbidity comparison device 6, and inject the same seawater turbidity reagent as in step S1. Then, adjust the pressure-resistant servo motor 16 to select the stirring speed of the stirring paddle 18 that is consistent with the turbidity of the solution suspension under normal pressure. Turn off the pressure-resistant servo motor 16 to complete the sealing of the pressurized turbidity comparison device 6, and put it together with the multiple turbidity sensors inside into the water pressure test system. Lead out each pressure-resistant data cable 8 to the terminal data analyzer 9. S3. Use a hydrostatic test system to simulate underwater pressure environments at different depths and apply predetermined pressure values ​​step by step. At each predetermined pressure value, the pressure sensor 11 is turned on to confirm the internal pressure of the pressurized turbidity comparator 6. Then, the pressure-resistant servo motor 16 is started to drive the stirring paddle 18 to make the internal test solution uniform. After the stirring is stable, the turbidity sensor 7 is turned on to measure the real-time data. The data is transmitted and stored to the terminal data analyzer 9 through each pressure-resistant data cable 8. After the measurement of the current pressure value is completed, the pressure-resistant servo motor 16 is turned off, and the pressure is increased to the next predetermined pressure value. This step is repeated until the measurement under all predetermined pressure value conditions is completed. S4. After the test, reduce the pressure in the water pressure test system to normal pressure and remove the pressurized turbidity comparison device 6 and the turbidity sensor 7. S5. Finally, the atmospheric pressure test data and the pressure test data stored in the terminal data analyzer 9 are compared and analyzed to form a turbidity sensor pressure comparison test data report.

[0044] This method establishes a complete workflow of "atmospheric pressure benchmark testing - pressurized step-by-step testing - comparative analysis." By obtaining benchmark data through pre-testing under atmospheric pressure, the interference of initial sensor errors is eliminated. During pressurized testing, the comparability and accuracy of the data are ensured by gradually increasing the pressure and simultaneously measuring the data after stirring at each pressure point. Finally, by comparing and analyzing the data from atmospheric pressure and pressurized conditions, correction coefficients can be provided under different depth pressure conditions. This method improves upon the unsuitability of traditional testing methods and sea trial comparison methods, and also introduces pressure parameters into the data calculation, solving the problem of unreasonable traditional calculation models.

[0045] In a preferred embodiment, in step S3, the simulated depth range of the hydrostatic test system is 0–6000 m, corresponding to a pressure range from atmospheric pressure to 60 MPa. The simulated pressure can be extended to 110 MPa by increasing the volume adjustment range of the pressure balancing component. This preferred range covers most deep-sea application scenarios (0–6000 m), and by adjusting the volume of the pressure-resistant balancing rubber bladder 15, it can be further extended to a full-ocean-depth environment of 110 MPa, meeting more extreme deep-sea testing requirements and expanding the applicability of the method. In this embodiment, the device's range covers 0–60 MPa, with an effective test space diameter of 300 mm and a height of 300 mm. Other domestic chemical testing institutions with similar hydrostatic test chambers, as long as their dimensions can accommodate a pressurized turbidity comparator and the pressure is higher than 60 MPa, can achieve the same purpose.

[0046] In a preferred embodiment, the stirring stabilization time in step S3 is 5 minutes. By setting a stirring stabilization time of 5 minutes, multiple turbidity sensors are turned on for real-time data measurement after uniform stirring for 5 minutes. This ensures that the turbidity standard particles are in a fully uniform suspension state in the sealed chamber, so that the turbidity value measured by the turbidity sensor 7 truly reflects the standard turbidity of the solution, avoiding measurement errors caused by uneven stirring.

[0047] In a preferred embodiment, in step S3, after activating the pressure sensor 11, the measured pressure value is first compared with the reading on the pressure gauge 4 of the hydrostatic testing system. Only after confirming there is no deviation is the pressure-resistant servo motor 16 started for stirring. This dual pressure comparison ensures that the actual pressure inside the sealed chamber is consistent with the target pressure set by the hydrostatic testing system, eliminating the influence of pressure deviation on the test results and further improving the accuracy and reliability of the test data. In this embodiment, after reaching the predetermined pressure value, the pressure sensor 11 is activated to check its consistency with the pressure gauge 4 of the hydrostatic testing system; if there is no pressure deviation, the pressure-resistant servo motor 16 is started.

[0048] In a preferred embodiment, the resolution of the high-precision standard turbidity sensor 7 is three times higher than that of the low-precision turbidity sensor being compared. By setting a resolution ratio condition, the high-precision standard turbidity sensor, serving as the comparison reference standard, is ensured to have sufficient accuracy to accurately reflect the influence of pressure on turbidity measurement, thereby providing a reliable pressure-based traceability coefficient for the low-precision turbidity sensor being compared. In this embodiment, the high-precision standard turbidity sensor, after undergoing "normal laboratory traceability - pressure testing - secondary normal laboratory traceability," serves as the standard reference value for comparison, while the low-precision turbidity sensor being compared is the object instrument being compared. A hydrostatic test system is used to simulate different deep-sea underwater pressure environments, and continuous turbidity parameter measurements are conducted within the pressure-based turbidity comparison device 6. Linear analysis results are then generated to verify the consistency of the three turbidity sensors under high-pressure conditions and to provide the traceability coefficient of the low-precision turbidity sensor under pressure.

[0049] The core of this invention lies in simulating the high-pressure environment of the deep sea using a hydrostatic testing system, while simultaneously creating a uniform and stable turbidity testing field under high pressure using a pressurized turbidity comparator 6. Specifically, the pressurized turbidity comparator 6, containing a turbidity solution and multiple turbidity sensors, is sealed and placed inside the hydrostatic testing chamber 1. When pressure is applied by the hydrostatic testing system, the pressure-resistant balancing rubber bladder 15 contracts under pressure, balancing the internal pressure of the sealed chamber with the external pressure of the hydrostatic testing chamber 1, thus allowing the internal turbidity sensors to actually withstand simulated deep-sea pressure. Simultaneously, a pressure-resistant servo motor 16 drives a stirring paddle 18 to rotate, ensuring uniform suspension of the turbidity standard particles. Formalazine particles are selected as the standard turbidity particles in the experiment. These particles are characterized by high pressure resistance, high stability, and low water solubility. During the experiment, the amount added can be controlled according to the effective space inside the main chamber 13 of the turbidity device to achieve different test turbidity concentration requirements. Alternatively, other stable, pressure-resistant, and seawater-insoluble particulate media can be selected as turbidity standard particles. Pressure sensor 11 monitors the internal pressure of the pressurized turbidity comparison device in real time and transmits the data to the terminal data analyzer 9. Under different pressure gradients, the high-precision standard turbidity sensor and the low-precision turbidity sensor being compared simultaneously measure the turbidity value. The data is transmitted to the terminal data analyzer 9 via the pressure-resistant data cable 8 for storage and analysis, and finally the traceability coefficient of the low-precision sensor under pressurized conditions is obtained.

[0050] This invention addresses the problem that turbidity sensors in my country's marine chemistry field can only be used for metrological traceability under normal laboratory conditions, and are currently unable to conduct joint "pressure-turbidity" parameter traceability under simulated deep-sea pressure environments. It improves upon the unsuitability of traditional testing methods, the inadequacy of traditional sea trial comparison methods, the lack of testing equipment, and the unreasonable calculation model for test data, providing a means for conducting simultaneous "pressure-turbidity" traceability of deep-sea-specific chemical parameters under simulated deep-sea pressure environments. This invention features a simple structure, convenient manufacturing, and a test environment that can simulate deep-sea pressure conditions, expanding the comprehensive performance testing methods for chemical parameter sensors used by various marine testing institutions in my country.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A marine turbidity sensor with pressure ratio measurement device, characterized in that, include: A hydrostatic testing system is used to provide a simulated deep-sea pressure environment; A pressure turbidity ratio measuring device is installed within the water pressure test system; The turbidity sensor to be measured is installed inside the pressurized turbidity comparison device; The pressurized turbidity comparator includes a sealed chamber, a pressure balancing assembly, a stirring assembly, an internal pressure monitoring assembly, and a mounting base. The sealed chamber is formed by a sealed connection of an upper end cover, a main chamber of the turbidity device, and a lower end cover. The pressure balancing assembly is installed at the bottom of the lower end cover, and its interior communicates with the sealed chamber. It can balance the pressure inside and outside the sealed chamber through volume changes under external pressure. The stirring assembly includes a pressure-resistant servo motor and a stirring paddle. The pressure-resistant servo motor is installed at the bottom of the lower end cover and drives the stirring paddle located inside the sealed chamber through a linkage bearing. The internal pressure monitoring assembly includes a pressure sensor and a sensor cover for protecting the pressure sensor. The pressure sensor is installed at the top of the upper end cover and is used to monitor the real-time pressure inside the sealed chamber. The mounting base is located at the bottom of the sealed chamber and is used to support the sealed chamber and house and protect the pressure balancing assembly and the stirring assembly. The turbidity sensor to be measured includes at least one high-precision standard turbidity sensor and at least one low-precision turbidity sensor to be compared. The pressure sensor, the high-precision standard turbidity sensor, and the low-precision turbidity sensor to be compared are respectively led out to the terminal data analyzer through pressure-resistant data cables.

2. The marine turbidity sensor with pressure comparison device according to claim 1, characterized in that, The pressure sensor cover, pressure sensor, upper cover, turbidity device main chamber, mounting base, pressure balance component, pressure-resistant servo motor, lower cover, and stirring paddle are all detachable structures, allowing the effective space of the sealed chamber to be changed according to the size of different hydrostatic test systems.

3. The marine turbidity sensor with pressure comparison device according to claim 1, characterized in that, The pressure sensor cover, pressure sensor, upper cover, turbidity device main chamber, mounting base, pressure balance component, pressure-resistant servo motor, lower cover, and stirring paddle are all detachable structures. The effective space of the sealed chamber can be changed according to the size of different turbidity sensors being measured, and multiple sensors can be measured simultaneously by increasing the number of pressure-resistant data cables at the upper cover.

4. The marine turbidity sensor with pressure comparison device according to claim 1, characterized in that, The pressure balancing component is a pressure-resistant balancing rubber bladder with adjustable volume. Adjusting its volume allows the pressurized turbidity ratio measuring device to be suitable for different water pressure testing ranges, up to a maximum of 110 MPa environment at full ocean depth.

5. The marine turbidity sensor with pressure comparison device according to claim 1, characterized in that, The pressure-resistant servo motor and stirring paddle are adjustable in speed, enabling continuous speed variation within the range of 0–300 r / min under pressure, thus adapting to the testing requirements of different turbidity standard particles.

6. A method for pressure comparison measurement using a marine turbidity sensor with the pressure comparison device described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Under normal pressure, the turbidity sensor under test is placed in the normal pressure test area of ​​the standard solution to perform normal pressure performance testing and traceability, obtain basic background data and store it in the terminal data analyzer. S2. Place the turbidity sensor to be measured back into the sealed chamber of the pressure turbidity comparison device, and inject the same seawater turbidity reagent as in step S1. Adjust the pressure-resistant servo motor to select a stirring speed of the stirring paddle that is consistent with the turbidity of the solution suspension under normal pressure. Then shut down the pressure-resistant servo motor, complete the sealing of the pressure-resistant turbidity comparison device, put it together with the multiple turbidity sensors inside into the water pressure test system, and lead out each pressure-resistant data cable to the terminal data analyzer. S3. Use a hydrostatic test system to simulate underwater pressure environments at different depths and apply predetermined pressure values ​​step by step. At each predetermined pressure value, the pressure sensor is turned on to confirm the internal pressure of the pressurized turbidity comparison device. Then, the pressure-resistant servo motor is started to drive the stirring paddle to make the internal test solution uniform. After the stirring is stable, the turbidity sensor under test is turned on to measure the data in real time, and the data is transmitted and stored to the terminal data analyzer through each pressure-resistant data cable. After completing the measurement of the current pressure value, turn off the pressure-resistant servo motor and continue to increase the pressure to the next predetermined pressure value. Repeat this step until all measurements under the predetermined pressure value conditions are completed. S4. Reduce the pressure in the water pressure test system to normal pressure, and remove the pressurized turbidity comparison device and the turbidity sensor to be measured. S5. Compare and analyze the atmospheric pressure test data and the pressure test data stored in the terminal data analyzer to generate a turbidity sensor pressure comparison test data report.

7. The method for measuring the pressure ratio of a marine turbidity sensor according to claim 6, characterized in that, In step S3, the depth range simulated by the hydrostatic test system is 0 to 6000m, and the corresponding pressure range is from atmospheric pressure to 60MPa. The simulated pressure can be extended to 110MPa by increasing the volume adjustment range of the pressure balancing component.

8. The method for measuring the pressure ratio of a marine turbidity sensor according to claim 6, characterized in that, In step S3, the stirring stabilization time is 5 minutes.

9. The method for measuring the pressure ratio using a marine turbidity sensor according to claim 6, characterized in that, In step S3, after turning on the pressure sensor, the measured pressure value is first compared with the pressure value displayed by the water pressure test system itself. After confirming that there is no deviation, the pressure-resistant servo motor is started to stir.

10. The method for measuring the pressure ratio of a marine turbidity sensor according to claim 6, characterized in that, Among the turbidity sensors being measured, the resolution of the high-precision standard turbidity sensor is three times higher than that of the low-precision turbidity sensor being measured.

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