A method and system for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling.

Abstract

This invention provides a method and system for monitoring the inventory of hydrogen peroxide test solution with active isolation and decoupling, relating to the field of medical device measurement and monitoring technology. It aims to improve the problem of continuous inventory closed-loop control deviation caused by the inability to accurately reconstruct the actual pumped volume from the weighing signal due to the overlap of chemical decomposition weight loss and pumping weight loss in the test solution. By periodically switching between static calibration and dynamic pumping states, a pure chemical decomposition weight loss reference rate is obtained under static conditions through active isolation, avoiding overlap with pumping weight loss; under dynamic conditions, the total weight loss is obtained, and the real-time decomposition weight loss is obtained after environmental compensation, with the difference reconstructing the actual pumping mass flow rate. Closed-loop control automatically compensates for attenuation, eliminating the need for a flow meter, accurately separating the pumped volume from the overlapped signal, solving the long-term inventory control inaccuracy problem, and significantly improving replenishment accuracy and system stability.

Description

Technical Field

[0001] This invention relates to the field of medical device measurement and monitoring technology, and more specifically, to a method and system for monitoring the inventory of hydrogen peroxide test solution that is decoupled during active isolation. Background Technology

[0002] In accelerated life testing of implants, material packages, or related devices, test solutions containing hydrogen peroxide (H2O2) are often used to simulate in vivo oxidative stress environments. To maintain the stability of the test solution volume, concentration, and refresh rate during long-term operation, existing platforms are typically equipped with storage tanks, pipelines, peristaltic pumps, weighing modules, temperature sensors, and control units. Some automated solutions also add concentration probes or electrochemical detection units to assist in determining the solution state.

[0003] Existing solutions can be broadly categorized into two types. The first type focuses on building automated reactive accelerated aging or similar long-term aging test platforms, maintaining test conditions through automatic replenishment, circulation, heating, and monitoring. The second type focuses on calculating the delivery volume or inventory level based on the weighing results of the storage tank, and controlling the start / stop or speed of the peristaltic pump accordingly. This type of solution typically assumes that the total weight loss of the storage tank is approximately consistent with the actual pumping volume.

[0004] However, for test solutions containing easily decomposable substances such as H2O2 that may be accompanied by gas escape, changes in the mass of the storage tank are not entirely equivalent to changes in the mass of the pump output. The test solution may spontaneously decompose in the storage tank, connecting pipelines, mixing areas, or the test environment, or decompose more rapidly due to temperature. Oxygen escape will result in additional weight loss. Furthermore, during long-term operation, factors such as peristaltic pump tubing aging, ambient temperature fluctuations, changes in liquid density, minor leaks, backflow, and liquid column disturbances can cause a continuous shift in the correlation between "weighing reading - actual delivery volume - inventory control volume."

[0005] Background technical defects and shortcomings: 1. The default assumption that "total weight loss is approximately equal to pumping volume" fails to distinguish between physical losses caused by pumping and mass losses caused by chemical decomposition, volatilization, or gas escape, leading to distorted liquid replenishment control. 2. Piping structures with continuous open circuits or relying solely on passive check valves lack a controllable static metering state, making it difficult to independently measure the chemical decomposition baseline under conditions unaffected by pumping, backflow, and liquid column disturbances. 3. Peristaltic pumps experience pump tube fatigue, decreased rebound, and flow rate decay after long-term operation. If the control system still calculates the delivery volume based on the initial pump efficiency, it will create an open-loop parameter and gradually amplify the cumulative error. 4. Temperature changes not only affect the decomposition rate of H2O2 but also the density of the test liquid. If the static calibration results and density parameters are still treated as constants, inventory conversion and closed-loop control will continuously deviate. 5. When the solution exhibits abnormal decomposition, rapid increase in bubbles, or an amplified trend of abnormal reactions, fixed threshold alarms are often delayed, making it difficult to promptly execute pump stop, valve closure, and protection actions.

[0006] In summary, the main drawbacks of the existing technology are: it cannot separate chemical decomposition weight loss and pumping weight loss online during long-term operation, resulting in contamination of the actual pumping volume information in the weighing signal; at the same time, it lacks an adaptive compensation mechanism for environmental changes, causing the inventory control accuracy to continuously deviate over operating time. Summary of the Invention

[0007] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0008] The present invention includes, for example, providing a method for monitoring the inventory of hydrogen peroxide test solution with active isolation and decoupling, which can improve the problem that the actual pumping volume cannot be accurately reconstructed from the weighing signal due to the superposition of chemical decomposition weight loss and pumping weight loss of the test solution, thereby causing continuous deviation in the inventory closed-loop control.

[0009] The embodiments of the present invention can be implemented as follows: Embodiments of the present invention provide a method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling, applicable to a system including a storage tank, downstream liquid circuit, and pumping actuator, wherein the control unit executes the following steps: Periodically switch the system to either static calibration state or dynamic pumping state; In the static calibration state, the liquid storage tank is actively isolated from the downstream liquid path to obtain the chemical decomposition weight loss reference rate caused by the chemical decomposition of the test liquid under static environmental parameters; In the dynamic pumping state, the liquid storage tank is controlled to actively connect with the downstream liquid path to obtain the total weight loss rate of the liquid storage tank and the corresponding dynamic environmental parameters. The chemical decomposition weight loss baseline rate is compensated based on the dynamic environmental parameters to obtain the real-time chemical decomposition weight loss rate under the dynamic environmental parameters. The actual pumped mass flow rate is reconstructed by calculating the difference between the total weight loss rate and the real-time chemical decomposition weight loss rate. The output of the pumping actuator is controlled based on the comparison between the actual pumped mass flow rate and the target rate.

[0010] In addition, the method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling provided in the embodiments of the present invention may also have the following additional technical features: Optionally, the system includes a weighing module for outputting the mass information of the storage tank, the pumping actuator is a peristaltic pump, the active isolation is performed by an active isolation valve, the static environmental parameters include at least temperature, and the dynamic environmental parameters include at least temperature.

[0011] Optionally, obtaining the chemical decomposition weight loss reference rate caused by the chemical decomposition of the test liquid under static environmental parameters includes: in the static calibration state, controlling the peristaltic pump to stop operating and closing the active isolation valve to isolate the liquid storage tank from the downstream liquid path, collecting the mass-time data output by the weighing module, and obtaining the chemical decomposition weight loss reference rate at the static environmental temperature based on the mass-time data.

[0012] Optionally, obtaining the total weight loss rate and corresponding dynamic environmental parameters of the liquid storage tank includes: in the dynamic pumping state, controlling the peristaltic pump to operate and opening the active isolation valve, collecting the mass data output by the weighing module and the temperature data output by the temperature sensor, and obtaining the total weight loss rate based on the mass data.

[0013] Optionally, the compensation of the chemical decomposition weight loss reference rate based on the dynamic environmental parameters includes: using a temperature correction model to convert the chemical decomposition weight loss reference rate into a real-time chemical decomposition weight loss rate under dynamic environmental temperature.

[0014] Optionally, the temperature correction model is an exponential model, which is: k_dec(t) = k_cal ×exp[β × (T(t)- T_cal)], where k_dec(t) is the real-time chemical decomposition weight loss rate under dynamic ambient temperature, k_cal is the chemical decomposition weight loss reference rate, T_cal is the static ambient temperature when the chemical decomposition weight loss reference rate is obtained, T(t) is the dynamic ambient temperature, and β is the temperature correction coefficient.

[0015] Optionally, the step of calculating the difference between the total weight loss rate and the real-time chemical decomposition weight loss rate includes: subtracting the real-time chemical decomposition weight loss rate from the total weight loss rate to obtain the actual pumped mass flow rate.

[0016] Optionally, the method further includes: converting the actual pumped mass flow rate into a volumetric flow rate, and comparing the volumetric flow rate with a target volumetric flow rate to control the output of the pumping actuator.

[0017] Optionally, converting the actual pumped mass flow rate into a volumetric flow rate includes: obtaining the density of the current test liquid and dividing the actual pumped mass flow rate by the density of the current test liquid.

[0018] Optionally, the step of obtaining the density of the current test solution includes: estimating the current concentration of the test solution based on the cumulative decomposition amount, the cumulative replenishment amount, and the initial solution preparation parameters, and updating the density of the current test solution using a concentration-temperature-density model; the concentration-temperature-density model is in polynomial form: ρ(C, T) = ρw(T) + a1×C + a2×C² + a3×C×(T - Tref), where ρw(T) is the density of pure water at the dynamic ambient temperature, C is the mass percentage concentration of hydrogen peroxide in the current test solution, a1, a2, and a3 are empirical coefficients, T is the dynamic ambient temperature, and Tref is the reference temperature.

[0019] Optionally, the method further includes: calculating the sliding window variance reflecting the mass fluctuation of the storage tank under the dynamic pumping state, and monitoring the changing trend of the real-time chemical decomposition weight loss rate; when the sliding window variance exceeds a set multiple of the baseline variance, and the real-time chemical decomposition weight loss rate continues to rise in multiple consecutive windows, it is determined to be an abnormal decomposition trend, and at least one of the following protective actions is executed: alarm, pump stop, and isolation.

[0020] Optionally, the total weight loss rate and the chemical decomposition weight loss baseline rate are obtained by any of the following methods: linear fitting, moving difference, local regression, or Kalman filter slope estimation.

[0021] This embodiment provides a hydrogen peroxide test solution inventory monitoring system with active isolation and decoupling, comprising a storage tank, a weighing module, an active isolation device, a pumping actuator, an environmental parameter sensor, and a control unit. The storage tank is used to contain hydrogen peroxide test solution. The weighing module is located at the bottom of the storage tank and is used to detect the mass of the storage tank. The active isolation device is located between the outlet of the storage tank and the downstream liquid path, and is used to controllably connect or disconnect the storage tank from the downstream liquid path. The pumping actuator is located downstream of the active isolation device and is used to pump the test solution in the storage tank to the downstream. The environmental parameter sensor is used to detect environmental condition parameters that affect the decomposition rate of the test solution. The control unit is connected to the weighing module, the active isolation device, the pumping actuator, and the environmental parameter sensor, and is configured to perform a method for monitoring the inventory of hydrogen peroxide test solution with active isolation and decoupling.

[0022] The beneficial effects of the active isolation decoupling hydrogen peroxide test solution inventory monitoring method and system of the present invention include, for example: A method for monitoring hydrogen peroxide test solution inventory with active isolation and decoupling is proposed. This method periodically switches between static calibration and dynamic pumping states, and actively isolates the storage tank from the downstream liquid path under static calibration. This allows for online acquisition of the pure chemical decomposition weight loss baseline, fundamentally avoiding the aliasing of decomposition and pumping weight losses. Under dynamic pumping, the total weight loss rate is acquired, and the real-time chemical decomposition weight loss rate is obtained using environmental parameter compensation. The actual pumping mass flow rate, reconstructed using difference calculations, eliminates environmental interferences such as temperature. Finally, this rate is compared with the target, and the pumping actuator is controlled in a closed loop, automatically compensating for factors such as pump efficiency decline and liquid density changes. Therefore, without adding a flow meter, the pumping volume is accurately separated from the aliased weighing signals, solving the problem of continuous inventory control inaccuracies during long-term operation and significantly improving replenishment accuracy and system stability.

[0023] The active isolation decoupling hydrogen peroxide test solution inventory monitoring system is used to implement the active isolation decoupling hydrogen peroxide test solution inventory monitoring method. It can improve the problem that the actual pumping volume cannot be accurately reconstructed from the weighing signal due to the superposition of chemical decomposition weight loss and pumping weight loss of the test solution, thus causing continuous deviation in the inventory closed-loop control. Attached Figure Description

[0024] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0025] Figure 1 This is a structural block diagram of the hydrogen peroxide test solution inventory monitoring system for active isolation and decoupling provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating the method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the signal decoupling principle in the active isolation decoupling hydrogen peroxide test solution inventory monitoring method provided in this embodiment of the invention; Figure 4 This is a schematic diagram of the abnormal early warning logic in the active isolation and decoupling hydrogen peroxide test solution inventory monitoring method provided in this embodiment of the invention.

[0026] Icons: Active isolation decoupling hydrogen peroxide test solution inventory monitoring system - 10; Storage tank - 100; Weighing module - 110; Active isolation device - 120; Pumping actuator - 130; Environmental parameter sensor - 140; Control unit - 150; Test solution mixing tank - 160; Implant test module or material test module - 170; Ventilation reflux assembly or condensation reflux assembly - 180; Electrochemical detection unit - 190. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0028] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does 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, and therefore should not be construed as a limitation of this invention.

[0029] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable 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, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In long-term aging tests of hydrogen peroxide-containing test solutions, existing technologies generally assume that "total weight loss in the storage tank ≈ pumping volume," directly controlling replenishment based on weighing signals. However, hydrogen peroxide readily decomposes to produce gas, and the decomposition weight loss and pumping weight loss are always mixed. Furthermore, factors such as temperature fluctuations, pump pipe aging, and density changes further exacerbate measurement and control errors. Due to the lack of isolation mechanisms, existing systems cannot independently obtain a chemical decomposition baseline during operation and can only passively accept mixed signals, resulting in continuous distortion of pumping volume estimation and a sharp decline in closed-loop control accuracy over operating time. At the same time, fixed threshold alarms are delayed, making it difficult to predict abnormal decomposition risks.

[0032] This embodiment uses an active isolation valve to periodically construct a static calibration state, achieving online and non-destructive separation of pure decomposition weight loss. Combined with total weight loss measurement and temperature compensation under dynamic pumping conditions, differential decoupling is used to reconstruct the actual pumping volume from the mixed weighing signal, completing closed-loop regulation without adding any flow meters. This fundamentally solves the long-term offset problem caused by decomposition interference and pump efficiency decay, enabling the system to maintain high-precision inventory control even with pump pipe aging, temperature changes, and density fluctuations, and simultaneously providing early warning of abnormal decomposition trends.

[0033] The following is combined Figures 1 to 4 This embodiment provides a detailed description of the method and system for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling.

[0034] Please refer to Figure 1 and Figure 2 This embodiment provides a method and system for monitoring the inventory of hydrogen peroxide test solution based on active isolation and time decoupling. It is used to conduct long-term and stable closed-loop monitoring of the inventory of test solutions containing hydrogen peroxide in accelerated life testing of devices such as implants and material packages.

[0035] "Active isolation" refers to the control unit 150 issuing a control signal to drive the active isolation device 120 (such as a solenoid valve or electric valve) to forcibly cut off the fluid connection between the storage tank 100 and the downstream liquid path, thus completely separating the storage tank 100 from the downstream liquid path physically. This action is active, controllable, and repeatable, unlike a check valve that passively operates solely based on fluid pressure. "Time-based decoupling" refers to a signal processing method that periodically switches the system to a static calibration state and a dynamic pumping state, acquiring the chemical decomposition weight loss reference and the total weight loss rate over time, and then using difference calculations to separate the aliased pumping weight loss from the decomposition weight loss.

[0036] Reference Figure 1The active isolation and decoupling hydrogen peroxide test solution inventory monitoring system 10 provided in this embodiment includes a storage tank 100, a weighing module 110, an active isolation device 120, a pumping actuator 130, an environmental parameter sensor 140, and a control unit 150. The storage tank 100 is used to contain hydrogen peroxide test solution. The weighing module 110 is located at the bottom of the storage tank 100 and is used to detect the mass of the storage tank 100. The active isolation device 120 is located between the outlet of the storage tank 100 and the downstream liquid path. The active isolation device 120 is used for... The system controls the connection or disconnection of the storage tank 100 from the downstream liquid path; the pumping actuator 130 is located downstream of the active isolation device 120 and is used to pump the test liquid in the storage tank 100 downstream; the environmental parameter sensor 140 is used to detect environmental condition parameters that affect the decomposition rate of the test liquid; the control unit 150 is connected to the weighing module 110, the active isolation device 120, the pumping actuator 130 and the environmental parameter sensor 140 respectively, and is configured to perform a method for monitoring the inventory of decomposed hydrogen peroxide test liquid during active isolation.

[0037] Specifically, the active isolation device 120 adopts an active isolation valve; the pumping actuator 130 adopts a peristaltic pump; and the environmental parameter sensor 140 adopts a temperature sensor.

[0038] A storage tank 100 is mounted on the weighing module 110 and is used to store the hydrogen peroxide test solution to be replenished. The storage tank 100 is preferably made of oxidation- and corrosion-resistant materials, such as glass, polytetrafluoroethylene (PTFE), or other fluoroplastic-lined containers, with a volume selectable from 1L to 50L depending on the test scale. The weighing module 110 is used to output the mass information of the storage tank 100 in real time, preferably a high-precision electronic balance or weighing sensor assembly, transmitting mass data to the control unit 150 in real time. The active isolation device 120 is not limited to a solenoid valve; it can also be a pneumatic angle seat valve, an electric ball valve, etc., and its installation position can be between the storage tank 100 and the peristaltic pump (as in this embodiment) or on the outlet side of the peristaltic pump. In some scenarios requiring higher reliability, two isolation valves can be installed upstream and downstream respectively, forming double isolation. The active isolation valve can be a normally closed solenoid valve, preferably a corrosion-resistant, low-leakage solenoid valve with a rated pressure of 1.0MPa and a response time ≤50ms. The active isolation valve is opened or closed by command from the control unit 150, which controls its opening and closing via a DC voltage output from a relay. The peristaltic pump, acting as a fluid replenishment actuator, delivers the test solution from the reservoir 100 to the test solution mixing tank 160 or directly to the implant testing module. The control unit 150 adjusts the motor speed via analog voltage or signal. In this embodiment, an experimental-grade precision peristaltic pump is used; in other embodiments, a diaphragm pump, gear pump, or syringe pump can also be used, as long as the output flow rate can be adjusted by the control unit 150.

[0039] Temperature sensors are used to collect temperatures around the liquid storage tank 100, at the mixing area, or inside the cabinet. Pt100, thermocouples, or NTC sensors can be used. Control unit 150 is electrically connected to the weighing module 110, the active isolation valve, the peristaltic pump, and the temperature sensors, respectively, and is used to execute static calibration, dynamic decoupling, and closed-loop control programs. Control unit 150 can be a PLC or industrial computer, with built-in PID calculation modules, timers, and data logging functions. Control unit 150 controls the start and stop of the solenoid valve and peristaltic pump through digital output modules, adjusts the pump speed through analog output modules, and reads weighing and temperature signals through analog input modules.

[0040] Reference Figure 1 In this embodiment, the environmental parameter sensor 140 is a temperature sensor, because temperature is the most important environmental factor affecting the decomposition rate of hydrogen peroxide.

[0041] Reference Figure 1 In this embodiment, the hydrogen peroxide test solution inventory monitoring system 10 for active isolation decoupling also includes a test solution mixing tank 160, an implant test module or material test module 170, a venting reflux component or a condensation reflux component 180, and an electrochemical detection unit 190.

[0042] The test solution mixing tank 160 is connected to the hydrogen peroxide storage tank 100 and is used to prepare test solutions of a specified concentration according to a set ratio. Its output end is connected to the implant testing module or material testing module 170 to provide a stable hydrogen peroxide testing environment for implant or material samples. The test solution mixing tank 160 can be set according to the structure of the test platform, or it can be omitted and directly supply liquid to the testing module. The venting and reflux assembly or condensation and reflux assembly 180 is connected in parallel with the storage tank 100 through a pipeline. The venting and reflux assembly is used to discharge the gas accumulated in the system and maintain... To maintain pressure balance, a condensation reflux assembly is used to capture and condense volatilized gaseous hydrogen peroxide, guiding it back to the storage tank 100 to reduce test solution loss. An electrochemical detection unit 190 is used to assist in acquiring information on oxygen concentration, redox state, or concentration changes. Connected to the test solution mixing tank 160 and the circulation loop of the test module via a sampling pipeline, it collects parameters such as hydrogen peroxide concentration, pH value, and conductivity of the test solution in real time and feeds the detection signals back to the control unit 150, achieving closed-loop monitoring and active isolation decoupling control of the test solution's inventory status. Multiple test modules can share the same storage tank 100 and the same weighing module 110, but the control unit 150 needs to manage the supply cycle and control parameters of each branch separately.

[0043] Please refer to Figure 2 This embodiment provides a method for monitoring hydrogen peroxide test solution inventory based on active isolation and time decoupling, executed by control unit 150. It includes the following steps: Step S1: Periodically switch the system to either static calibration state or dynamic pumping state.

[0044] The control unit 150 periodically checks whether the current time has reached the preset calibration period P (e.g., P = 2 hours) in the main loop. If it has, it switches to the static calibration state; if it has not, it maintains or switches to the dynamic pumping state. This periodic switching achieves time multiplexing, enabling the system to perform "calibration" and "pumping" functions separately in different time periods.

[0045] Step S2: Under static calibration conditions, control the liquid storage tank 100 to actively isolate it from the downstream liquid path, and obtain the reference rate of chemical decomposition weight loss caused by the chemical decomposition of the test liquid under static environmental parameters.

[0046] Specifically, the control unit 150 first stops the peristaltic pump and closes the active isolation valve, thus completely physically isolating the storage tank 100 from the downstream liquid path. At this time, the storage tank 100 becomes an isolated closed system, with no liquid being pumped out and no disturbance or backflow from the downstream liquid column. The only factor causing a decrease in the mass of the storage tank 100 is the chemical decomposition of hydrogen peroxide, producing oxygen that escapes. Then, the control unit 150 collects the mass-time data output by the weighing module 110, obtains the slope a_cal (negative value) through linear fitting, and defines the chemical decomposition weight loss reference rate k_cal = -a_cal. This chemical decomposition weight loss reference rate reflects the weight loss rate caused by pure decomposition at a static ambient temperature T_cal. Through active isolation, the decomposition weight loss can be measured separately and accurately during operation, solving the problem of not being able to distinguish between pumping consumption and chemical decomposition consumption.

[0047] Step S3: In dynamic pumping mode, control the liquid storage tank 100 to actively connect with the downstream liquid circuit to obtain the total weight loss rate of the liquid storage tank 100 and the corresponding dynamic environmental parameters.

[0048] Control unit 150 opens the active isolation valve and starts the peristaltic pump, connecting the storage tank 100 to the downstream liquid path and resuming normal pumping. At this time, the mass reduction detected by the weighing module 110 includes two parts: pumping consumption and chemical decomposition consumption. Control unit 150 collects mass and temperature data in real time, and obtains the total weight loss rate k_tot(t) through linear fitting using a sliding window of 15-30 seconds. Simultaneously, the temperature sensor collects the dynamic ambient temperature T(t) as an environmental condition parameter.

[0049] Step S4: Compensate the chemical decomposition weight loss baseline rate based on dynamic environmental parameters to obtain the real-time chemical decomposition weight loss rate under dynamic environmental parameters.

[0050] Since the chemical decomposition rate is highly temperature-dependent, and the baseline rate k_cal measured under static calibration conditions corresponds to the static ambient temperature T_cal, a temperature correction must be performed on k_cal when the dynamic ambient temperature T(t) differs from T_cal. Temperature correction allows the static calibration results to be applicable to changing temperature environments, avoiding decomposition rate estimation errors caused by temperature fluctuations.

[0051] Step S5: Calculate the difference between the total weight loss rate and the real-time chemical decomposition weight loss rate to reconstruct the actual pumping mass flow rate.

[0052] The control unit 150 calculates the actual pumped mass flow rate q_m(t) = k_tot(t) - k_dec(t). This difference calculation separates the pure pumping contribution from the mixed signal. When q_m(t) becomes negative or deviates significantly from a reasonable range, it can be truncated to zero and an anomaly detection is triggered. This embodiment reconstructs the actual pumping volume using only the weighing module 110 and control logic without adding an additional flow meter, which is key to achieving closed-loop inventory control.

[0053] Step S6: Based on the comparison between the actual pumped mass flow rate and the target rate, control the output of the pumping actuator 130.

[0054] The control unit 150 compares the actual pumped mass flow rate q_m(t) with the preset target flow rate q_set and calculates the deviation. Then, it adjusts the peristaltic pump speed using strategies such as PID control, segmented lookup table control, or duty cycle adjustment to make the actual pumped flow rate approach the target flow rate. Simultaneously, the inventory level is directly represented by the absolute mass value of the weighing module 110. When the remaining mass falls below a set threshold, a prompt to replenish liquid or replace the storage tank 100 is output. This closed-loop control mechanism automatically compensates for delivery attenuation caused by factors such as pump pipe aging, temperature deviation, and changes in liquid density, ensuring long-term operational stability.

[0055] Building upon the above, by establishing a controllable, repeatable, and low-disturbance static metering state during the calibration period using an active isolation valve, the weighing signal from the storage tank 100 can independently characterize the weight loss caused by chemical decomposition under conditions of pump shutdown and isolation of the downstream liquid path, thus fundamentally solving the problem of difficult separation of mixed signals. Through time-division multiplexing control of the static calibration window and the dynamic pumping window, the decomposition baseline is obtained in the static stage, and the total weight loss rate is obtained in the dynamic stage. The actual pumped mass flow rate is reconstructed by subtracting the temperature-corrected decomposition rate from the total weight loss rate. This allows the same weighing module 110 to simultaneously perform both "calibration" and "online reconstruction" functions without adding a dedicated flow meter.

[0056] Upon system startup, the control unit 150 first executes the initialization procedure. The operator inputs the following initial parameters through the human-machine interface or the control unit 150 automatically reads them: initial mass W0 of the storage tank 100, initial temperature T0, initial test liquid concentration C0 (if known), and initial density ρ0; sets the calibration period P, static calibration window duration τc, pump stop vibration damping time τs, weighing sampling frequency f, target replenishment flow rate q_set, inventory lower limit threshold, and abnormal warning threshold.

[0057] Calibration period The system performs static calibration at what interval? In this embodiment, the value of P ranges from 0.5 to 12 hours, preferably 2 to 6 hours. If P is too short, frequent entry into the static calibration state will affect pumping efficiency; if P is too long, the temperature change will accumulate significantly, and the temperature correction error may increase. Static calibration window duration. The duration of each static calibration. In this embodiment, The value range is 20–300 seconds, preferably 60–120 seconds. The time required needs to be sufficient to collect enough mass-time data for fitting, but should not be too long to avoid excessively consuming pumping time. Pump shutdown and vibration damping time. After closing the active isolation valve and stopping the peristaltic pump, wait for the time required for liquid column disturbance, mechanical vibration, and pipeline rebound to decay. In this embodiment, The value range is 3–30 seconds, preferably 5–10 seconds. After… Afterward, the readings of the weighing module 110 tend to stabilize, and only at this point can the collected data truly reflect the weight loss due to chemical decomposition. Weighing sampling frequency. The frequency at which the weighing module 110 sends mass data to the control unit 150. In this embodiment, Set to 0.1–2 Hz to ensure that subtle trends in mass change can be captured. Target replenishment flow rate q_set: The desired volumetric flow rate (mL / min) output by the peristaltic pump; this value is determined by the test process requirements, for example, 5 mL / min. Lower inventory threshold: When the remaining mass in reservoir 100 falls below this value, the control unit 150 will issue a prompt to replenish or replace reservoir 100. For example, it can be set to the initial mass. 10% of 0. Anomaly warning threshold: a parameter used for subsequent anomaly detection, such as variance multiple. Typically, the value is 2 to 5. In addition, during the initial startup phase, when the liquid storage tank 100 is stationary and without pumping, a range of weighing data (e.g., 100 data points) is continuously collected. The variance of these data is calculated as the baseline variance σ_base², which reflects the noise level of the weighing module 110 itself and the impact of disturbances such as environmental vibration. This baseline variance is subsequently used for fluctuation comparison during abnormal decomposition.

[0058] In this embodiment, the system includes a weighing module 110 for outputting mass information of the storage tank 100, a peristaltic pump for the pumping actuator 130, and an active isolation valve for active isolation. Static environmental parameters include at least temperature, and dynamic environmental parameters also include at least temperature. The peristaltic pump has advantages such as being pollution-free and having easily replaceable pump tubing. The active isolation valve is a solenoid valve with a fast response speed, facilitating precise control by the control unit 150. A temperature sensor monitors the temperature near the storage tank 100 in real time, providing data for temperature correction.

[0059] In this embodiment, obtaining the chemical decomposition weight loss reference rate caused by the chemical decomposition of the test liquid under static environmental parameters includes: in the static calibration state, controlling the peristaltic pump to stop running and closing the active isolation valve to isolate the liquid storage tank 100 from the downstream liquid path, collecting the mass-time data output by the weighing module 110, and obtaining the chemical decomposition weight loss reference rate at the static environmental temperature based on the mass-time data.

[0060] The specific operation for obtaining the chemical decomposition weight loss reference rate under static calibration conditions is as follows: First, stop the peristaltic pump and close the active isolation valve to completely isolate the storage tank 100 from the downstream liquid path. Then, wait for a preset damping time τs, 3-30 seconds, for example, 5 seconds, to eliminate the effects of liquid column disturbance, mechanical vibration, and pipeline rebound. Afterward, continuously collect the mass-time data W(t) output by the weighing module 110 at a sampling frequency f, 0.1-2 Hz. The sampling duration is approximately the static calibration window duration τc minus τs, where τc is 20-300 seconds, preferably 60-120 seconds. For example, if τc = 90 seconds and τs = 5 seconds, then the sampling time is 85 seconds. Finally, perform least-squares linear fitting on the mass-time series to obtain the slope a_cal, and define the chemical decomposition weight loss reference rate k_cal = -a_cal. This reference rate is the basis for all subsequent temperature corrections and difference decoupling; its accuracy directly determines the reconstruction accuracy of the final pumping volume.

[0061] In this embodiment, obtaining the total weight loss rate and corresponding dynamic environmental parameters of the liquid storage tank 100 includes: in dynamic pumping state, controlling the peristaltic pump to operate and opening the active isolation valve, collecting the mass data output by the weighing module 110 and the temperature data output by the temperature sensor, and obtaining the total weight loss rate based on the mass data.

[0062] The specific operation for obtaining the total weight loss rate under dynamic pumping conditions is as follows: Open the active isolation valve, start the peristaltic pump, and connect the storage tank 100 to the downstream liquid path. Collect the mass data output by the weighing module 110 and the temperature data output by the temperature sensor in real time. For the mass data, use a sliding window (e.g., a window length of 60 seconds) for linear fitting to calculate the total weight loss rate k_tot(t) at the current moment in real time. The length of the sliding window needs to balance response speed and stability: a window that is too short will result in high noise, while a window that is too long will result in a delayed response. In this embodiment, 60 seconds is preferred, as it can better track rate changes.

[0063] In this embodiment, compensating for the chemical decomposition weight loss baseline rate based on dynamic environmental parameters includes: using a temperature correction model to convert the chemical decomposition weight loss baseline rate into a real-time chemical decomposition weight loss rate under dynamic environmental temperature.

[0064] The control unit 150 uses a temperature correction model to convert the statically calibrated chemical decomposition weight loss baseline rate k_cal into the real-time chemical decomposition weight loss rate k_dec(t) under dynamic ambient temperature. Specifically, it reads the dynamic ambient temperature T(t), obtains the temperature T_cal and baseline rate k_cal recorded in the last static calibration, and substitutes them into the temperature correction model for calculation. This compensation step enables the system to accurately deduct decomposition weight loss even in environments with changing temperatures, which is crucial for ensuring the accuracy of difference decoupling.

[0065] In this embodiment, the temperature correction model is either an exponential model or a Q10 model. The exponential model is: k_dec(t) = k_cal × exp[β × (T(t) - T_cal)], where k_dec(t) is the real-time chemical decomposition weight loss rate under dynamic ambient temperature, k_cal is the baseline chemical decomposition weight loss rate, T_cal is the static ambient temperature at which the baseline chemical decomposition weight loss rate is obtained, T(t) is the dynamic ambient temperature, and β is the temperature correction coefficient, which can be an empirical value, pre-calibrated experimentally, or continuously corrected during experiments: β is obtained by measuring the decomposition rate of hydrogen peroxide at different temperatures and fitting the ln(k)~T curve. The Q10 model is: k_dec(t) = k_cal × Q10^((T(t) - T_cal) / 10). Q10 represents the factor by which the decomposition rate increases by 10°C, typically taken as 2~3. This model is simple and intuitive, with low computational complexity, and is suitable for real-time computation in the embedded control unit 150. Both models can achieve temperature compensation, and users can choose according to their actual accuracy requirements and computing resources.

[0066] Reference Figure 3The horizontal axis represents time, and the vertical axis represents mass. In this embodiment, the difference calculation between the total weight loss rate and the real-time chemical decomposition weight loss rate includes: subtracting the real-time chemical decomposition weight loss rate from the total weight loss rate to obtain the actual pumped mass flow rate.

[0067] Control unit 150 executes: Actual pumped mass flow rate q_m(t) = Total weight loss rate k_tot(t) - Real-time chemical decomposition weight loss rate k_dec(t). This subtraction operation is the core of signal decoupling. When both k_tot(t) and k_dec(t) are mass flow rates (unit: g / s), q_m(t) is the actual pumped mass flow rate. If the calculation result is negative (theoretically impossible, but possibly due to measurement noise), it is set to zero and the abnormal event is recorded.

[0068] In this embodiment, controlling the output of the pumping actuator 130 includes: adjusting the rotational speed of the peristaltic pump based on the deviation between the actual pumping mass flow rate and the preset target flow rate, so that the actual pumping flow rate approaches the target flow rate.

[0069] The control unit 150 compares the actual pumped mass flow rate q_m(t) with the preset target flow rate q_set, and calculates the error e(t) = q_set - q_m(t). Then, a PID controller is used to calculate the required peristaltic pump speed adjustment. The adjusted speed signal is output to the peristaltic pump driver, causing the actual flow rate to gradually approach the target flow rate. Simultaneously, the control unit 150 reads the absolute mass value of the weighing module 110 in real time. When the remaining mass in the storage tank 100 falls below the lower inventory threshold, for example, 10% of the initial mass, an audible and visual alarm is issued, prompting the user to replenish the test solution or replace the storage tank 100.

[0070] In this embodiment, the method further includes: converting the actual pumped mass flow rate into a volumetric flow rate, and comparing the volumetric flow rate with a target volumetric flow rate to control the output of the pumping actuator 130.

[0071] In this embodiment, converting the actual pumped mass flow rate into volumetric flow rate includes: obtaining the density of the current test liquid and dividing the actual pumped mass flow rate by the density of the current test liquid.

[0072] In practical applications, replenishment control typically involves volumetric flow rate rather than mass flow rate. Therefore, this embodiment also includes a step of converting the actual pumped mass flow rate into a volumetric flow rate. The control unit 150 acquires the density ρ(C,T) of the current test liquid and then calculates the actual pumped volumetric flow rate q_v(t) = q_m(t) / ρ(C,T). The density ρ(C,T) is a function of the concentration C and the temperature T. Initially, the density ρ0 is known; during operation, it can be updated through subsequent steps. Then, q_v(t) is compared with the target volumetric flow rate q_set_vol for closed-loop adjustment. This conversion makes the control objective more intuitive.

[0073] In this embodiment, the step of obtaining the density of the current test solution includes: estimating the current concentration of the test solution based on the cumulative decomposition amount, the cumulative replenishment amount, and the initial solution preparation parameters, and updating the density of the current test solution using a concentration-temperature-density model; the concentration-temperature-density model is in polynomial form: ρ(C, T) = ρw(T) + a1×C + a2×C² + a3×C×(T -Tref), where ρw(T) is the density of pure water at the dynamic ambient temperature, C is the mass percentage concentration of hydrogen peroxide in the current test solution, T is the dynamic ambient temperature (°C), a1, a2, and a3 are empirical coefficients, pre-calibrated through experiments, and Tref is the reference temperature.

[0074] To improve the accuracy of volumetric flow rate conversion, this embodiment optionally performs a density update step. The control unit 150 estimates the current test solution concentration C(t) through material balance based on the cumulative decomposition amount, cumulative replenishment amount, and initial solution preparation parameters. Here, ρw(T) is the density of pure water at dynamic ambient temperature, which can be obtained by looking up tables, empirical formulas, or pre-stored physical property data; a1, a2, and a3 are empirical coefficients, which can be fitted based on density experimental data of the target test solution within a predetermined concentration and temperature range; Tref is the reference temperature, which can be set according to density calibration conditions or system default parameters, such as 20℃ or 25℃. This model can accurately describe the change in density of hydrogen peroxide solution with concentration and temperature.

[0075] Reference Figure 4 In this embodiment, the method further includes: calculating the sliding window variance reflecting the mass fluctuation of the storage tank 100 under dynamic pumping conditions, and monitoring the changing trend of the real-time chemical decomposition weight loss rate; when the sliding window variance exceeds a set multiple of the baseline variance and the real-time chemical decomposition weight loss rate continues to rise in multiple consecutive windows, it is determined to be an abnormal decomposition trend, and at least one of the following protective actions is executed: alarm, pump stop, isolation.

[0076] To enhance system operational safety, this embodiment implements anomaly warning and protection procedures. Under dynamic pumping conditions, the control unit 150 synchronously calculates the sliding window variance σ_curr² of the weighing signal and monitors the changing trend of the real-time chemical decomposition weight loss rate k_dec(t). Specifically, a segment of weighing data is collected in advance during the initial, undisturbed startup phase, and the baseline variance σ_base² is calculated. During normal operation, if σ_curr² > n × σ_base², where n is 2~5, it indicates abnormal fluctuations within the storage tank 100 (possibly due to a large number of bubble impacts). Simultaneously, if k_dec(t) continuously increases within multiple consecutive windows (e.g., three consecutive calibration cycles or five consecutive sliding windows) (i.e., the regression slope is positive), it indicates that the decomposition rate is accelerating. When both conditions are met simultaneously, it is determined to be an abnormal decomposition, an increase in bubbles, or an amplified abnormal reaction trend. At this time, the control unit 150 immediately executes protective actions: issuing an audible and visual alarm, stopping the peristaltic pump, closing the active isolation valve, pausing the test program, and saving the current data. These protective actions effectively prevent the accident from escalating and ensure the safety of equipment and personnel.

[0077] In this embodiment, under static calibration, after the liquid storage tank 100 is actively isolated from the downstream liquid path, a preset damping time is waited before the chemical decomposition weight loss reference rate is obtained.

[0078] In static calibration, after the control unit 150 closes the active isolation valve and stops the peristaltic pump, it does not immediately begin data acquisition. Instead, it waits for a preset damping time τs (selected from 3 to 30 seconds, preferably 5 to 10 seconds). This is because the instantaneous stopping of the pump and closing of the valve causes disturbances such as liquid sloshing, pipeline elastic rebound, and mechanical vibration, resulting in short-term fluctuations in the weighing reading. After waiting for τs, the system enters a stable state, and the mass-time data acquired at this time more accurately reflects the weight loss caused by chemical decomposition. The introduction of damping time significantly improves calibration accuracy.

[0079] In this embodiment, the total weight loss rate and the chemical decomposition weight loss baseline rate are obtained through any of the following methods: linear fitting, moving difference, local regression, or Kalman filter slope estimation. Specifically, the chemical decomposition weight loss baseline rate can also be obtained using moving average post-fitting, robust regression, median filtering post-fitting, or other equivalent algorithms.

[0080] The acquisition of the total weight loss rate and the chemical decomposition weight loss baseline rate is not limited to least squares linear fitting. This embodiment allows for alternative algorithms such as moving average, local regression, and slope estimation after Kalman filtering. For example, when there is a persistent offset in the system, Kalman filtering can provide a smoother rate estimate. Users can choose the most suitable algorithm based on the actual signal characteristics, which reflects the flexibility and adaptability of this invention.

[0081] The working principle of the hydrogen peroxide test solution inventory monitoring method for active isolation and decoupling provided in this embodiment includes: By combining temperature correction with active isolation and differential decoupling, this method solves the problem of distinguishing and reconstructing the actual pumping volume from the 100-ton weighing signal of the storage tank without adding an additional flow meter. This overcomes the continuous interference of chemical decomposition, pump efficiency decline, and ambient temperature changes on inventory control accuracy. It achieves signal separation and adaptive compensation at extremely low hardware costs, which is impossible with traditional solutions, significantly improving the reliability and safety of accelerated life testing. It also solves the problem in long-term operation scenarios containing easily decomposable test solutions such as hydrogen peroxide.

[0082] In this embodiment, the static calibration window measures the chemical decomposition rate online. It is online, periodic, and automatically inserted into the normal pumping process. The calibration results are used for dynamic decoupling in real time through temperature correction, forming a continuous closed-loop control—a technical effect that conventional calibration cannot achieve.

[0083] The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling provided in this embodiment has at least the following advantages: By actively isolating and using time-division multiplexing, the "pumping loss" and "chemical decomposition loss" mixed in the weighing signal can be separated. In static calibration, because the isolation valve is closed and the peristaltic pump stops, all mass loss is caused by chemical decomposition; therefore, the measured chemical decomposition weight loss baseline rate is the pure decomposition rate. In dynamic pumping, the pumping rate is obtained by subtracting the real-time chemical decomposition weight loss rate from the total weight loss rate. This separation method eliminates the systematic error of mistaking decomposition for pumping in traditional solutions, significantly improving the reliability of inventory monitoring.

[0084] Traditional solutions often require installing flow meters on the pipeline to obtain the actual pumping volume, but flow meters are expensive, prone to clogging, and susceptible to corrosion. This embodiment utilizes only the existing weighing module 110 and control logic, and the pumping volume can be obtained through mathematical reconstruction, with almost no increase in hardware costs and a corresponding reduction in maintenance points. This is particularly important for accelerated life testing platforms that operate for long periods.

[0085] Aging of the peristaltic pump tubing leads to a decrease in flow rate at the same rotational speed, while fluctuations in ambient temperature cause changes in decomposition rate and density. This embodiment can automatically compensate for pump efficiency decline through closed-loop control (comparing the reconstructed actual flow rate with the target and adjusting the rotational speed); it can adjust the estimated decomposition rate in real time through a temperature correction model; and it can maintain the accuracy of mass-volume conversion through density updates. Therefore, even with pump tubing aging, temperature deviations, and concentration changes, the system can still maintain stable liquid delivery accuracy.

[0086] Traditional fixed threshold alarms are slow to react when anomalies occur. This embodiment, by monitoring the variance of the weighing signal (reflecting bubble impact) and the trend of changes in the decomposition rate (reflecting reaction acceleration), can issue warnings and execute protective actions (stop pump, close valve, alarm) at an early stage of anomaly (e.g., when bubbles begin to be generated in large quantities but have not yet caused splashing). This warning mechanism based on signal characteristics is faster and more reliable than simple threshold judgment.

[0087] All components used in this embodiment (liquid storage tank 100, weighing module 110, solenoid valve, peristaltic pump, temperature sensor, PLC) are commercially available standard components, requiring no customization. The control method has clear steps and can be easily programmed. The system can be expanded to allow multiple channels to share the same liquid storage tank 100, with the control unit 150 managing the liquid supply cycle of each branch, making it suitable for large-scale, long-cycle accelerated life testing.

[0088] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for monitoring the inventory of hydrogen peroxide test solution with active isolation and decoupling, applied to a system including a storage tank, downstream liquid circuit, and pumping actuator, characterized in that, The control unit performs the following steps: Periodically switch the system to either static calibration state or dynamic pumping state; In the static calibration state, the liquid storage tank is actively isolated from the downstream liquid path to obtain the chemical decomposition weight loss reference rate caused by the chemical decomposition of the test liquid under static environmental parameters; In the dynamic pumping state, the liquid storage tank is controlled to actively connect with the downstream liquid path to obtain the total weight loss rate of the liquid storage tank and the corresponding dynamic environmental parameters. The chemical decomposition weight loss baseline rate is compensated based on the dynamic environmental parameters to obtain the real-time chemical decomposition weight loss rate under the dynamic environmental parameters. The actual pumped mass flow rate is reconstructed by calculating the difference between the total weight loss rate and the real-time chemical decomposition weight loss rate. The output of the pumping actuator is controlled based on the comparison between the actual pumped mass flow rate and the target rate.

2. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling according to claim 1, wherein the system includes a weighing module for outputting the mass information of the storage tank, characterized in that: The pumping actuator is a peristaltic pump, the active isolation is performed by an active isolation valve, the static environmental parameters include at least temperature, and the dynamic environmental parameters include at least temperature.

3. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling according to claim 2, characterized in that, The acquisition of the baseline rate of chemical decomposition weight loss caused by the chemical decomposition of the test liquid under static environmental parameters includes: In the static calibration state, the peristaltic pump is stopped and the active isolation valve is closed to isolate the storage tank from the downstream liquid path. Mass-time data output by the weighing module is collected, and the chemical decomposition weight loss reference rate at static ambient temperature is obtained based on the mass-time data.

4. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling according to claim 3, characterized in that, The process of obtaining the total weightlessness rate and corresponding dynamic environmental parameters of the liquid storage tank includes: In the dynamic pumping state, the peristaltic pump is controlled to operate and the active isolation valve is opened. Mass data output by the weighing module and temperature data output by the temperature sensor are collected, and the total weight loss rate is obtained based on the mass data.

5. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling according to claim 4, characterized in that, The compensation of the chemical decomposition weight loss reference rate based on the dynamic environmental parameters includes: using a temperature correction model to convert the chemical decomposition weight loss reference rate into a real-time chemical decomposition weight loss rate under dynamic environmental temperature.

6. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling according to claim 5, characterized in that: The temperature correction model is an exponential model, which is: k_dec(t) = k_cal × exp[β × (T(t)- T_cal)], where k_dec(t) is the real-time chemical decomposition weight loss rate under dynamic ambient temperature, k_cal is the chemical decomposition weight loss baseline rate, T_cal is the static ambient temperature when the chemical decomposition weight loss baseline rate is obtained, T(t) is the dynamic ambient temperature, and β is the temperature correction coefficient.

7. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling according to claim 1, characterized in that, The step of calculating the difference between the total weight loss rate and the real-time chemical decomposition weight loss rate includes: subtracting the real-time chemical decomposition weight loss rate from the total weight loss rate to obtain the actual pumped mass flow rate.

8. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling according to claim 1, characterized in that, The method further includes: The actual pumped mass flow rate is converted into a volumetric flow rate, and the volumetric flow rate is compared with a target volumetric flow rate to control the output of the pumping actuator.

9. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling according to claim 8, characterized in that, The step of converting the actual pumped mass flow rate into a volumetric flow rate includes: obtaining the density of the current test liquid and dividing the actual pumped mass flow rate by the density of the current test liquid.

10. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling according to claim 9, characterized in that, The step of obtaining the density of the current test liquid includes: The current concentration of the test solution is estimated based on the cumulative decomposition amount, cumulative replenishment amount, and initial solution preparation parameters, and the density of the current test solution is updated using a concentration-temperature-density model. The concentration-temperature-density model is in polynomial form: ρ(C,T) =ρw(T) + a1×C + a2×C² + a3×C×(T - Tref), where ρw(T) is the density of pure water at the dynamic ambient temperature, C is the mass percentage concentration of hydrogen peroxide in the current test solution, a1, a2, and a3 are empirical coefficients, T is the dynamic ambient temperature, and Tref is the reference temperature.

11. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation and decoupling according to claim 1, characterized in that, The method further includes: In the dynamic pumping state, the variance of the sliding window reflecting the mass fluctuation of the storage tank is calculated, and the changing trend of the real-time chemical decomposition weight loss rate is monitored. When the variance of the sliding window exceeds a set multiple of the baseline variance, and the real-time chemical decomposition weight loss rate continues to rise in multiple consecutive windows, it is determined to be an abnormal decomposition trend, and at least one of the following protective actions is executed: alarm, pump stop, and isolation.

12. The method for monitoring the inventory of hydrogen peroxide test solution during active isolation decoupling according to claim 1, characterized in that: The total weight loss rate and the chemical decomposition weight loss baseline rate are obtained by any of the following methods: linear fitting, moving difference, local regression, or Kalman filter slope estimation.

13. A hydrogen peroxide test solution inventory monitoring system for active isolation and decoupling, characterized in that, include: A storage tank for containing hydrogen peroxide test solution; A weighing module is provided at the bottom of the liquid storage tank and is used to detect the mass of the liquid storage tank. An active isolation device is disposed between the outlet of the liquid storage tank and the downstream liquid path, and the active isolation device is used to controllably connect or disconnect the liquid storage tank and the downstream liquid path; A pumping actuator is located downstream of the active isolation device and is used to pump the test liquid in the storage tank downstream. Environmental parameter sensor, used to detect environmental condition parameters that affect the decomposition rate of test liquid; The control unit is connected to the weighing module, the active isolation device, the pumping actuator and the environmental parameter sensor, respectively, and is configured to perform the hydrogen peroxide test solution inventory monitoring method for active isolation decoupling as described in any one of claims 1 to 12.

Images