A sensor-based table salt quality detection system and method

Abstract

The application relates to the technical field of table salt quality detection, and discloses a table salt quality detection system and method based on a sensor, which comprises an environment construction module, a dissolution response sensor array, a sensing signal acquisition module, a response feature extraction module and a quality judgment module. The local dissolution process of table salt crystals is triggered under the condition that the environment is lower than the complete dissolution threshold of table salt, the dissolution response sensor array arranged around the table salt sample to be detected is used to synchronously collect the dissolution responses in different spatial directions in time, and the response features reflecting the direction difference of the dissolution behaviors are extracted based on the obtained dissolution response time sequence data, so that the crystal form integrity of the table salt and the influence degree of impurities are comprehensively judged.

Description

Technical Field

[0001] This invention relates to the field of salt quality testing technology, and in particular to a sensor-based salt quality testing system and method. Background Technology

[0002] As a crystalline food ingredient with sodium chloride as its main component, the quality of table salt directly affects the safety of food processing and its stability in industrial use. Existing table salt quality testing technologies mainly include chemical titration analysis, ion content determination, conductivity detection, and spectroscopic analysis. These methods typically involve completely dissolving a salt sample in a liquid medium and then detecting the ion concentration, electrical parameters, or optical properties in the solution state to determine the purity or impurities of the salt.

[0003] However, the aforementioned detection methods require the complete dissolution of the salt during the testing process, and the results reflect the overall physical or chemical parameters of the solution, inevitably damaging the original crystal structure of the salt. In practical applications, salts from different sources, processed using different techniques, or containing different impurities may exhibit similar solution parameters after complete dissolution, but their crystal structure, crystal integrity, and crystal face distribution may still show significant differences, which current technologies struggle to effectively distinguish.

[0004] Especially in the initial stage of salt dissolution, the dissolution behavior on the crystal surface or crystal facet is significantly affected by the crystal structure and the distribution of impurity salts. The dissolution response characteristics exhibited at this stage can more realistically reflect the structural state and quality differences of salt. However, existing detection methods generally ignore the initial behavioral characteristics during the dissolution process, relying only on the static detection results after complete dissolution. This results in insufficient ability to distinguish the integrity of the salt crystal structure and the influence of impurities, thus limiting the accuracy and distinguishing ability of salt quality detection.

[0005] Therefore, there is an urgent need to provide a new technical solution for salt quality testing that can detect and analyze the behavioral characteristics of salt crystals in the early stage of dissolution without damaging the salt crystal structure, so as to achieve a more accurate judgment of salt quality. Summary of the Invention

[0006] The purpose of this invention is to provide a sensor-based salt quality detection system, which has the advantage of being able to detect and analyze the behavioral characteristics of salt crystals in the early stage of dissolution without damaging the salt crystal structure, thereby achieving a more accurate judgment of salt quality.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A sensor-based salt quality detection system includes: The environment construction module is used to create environmental conditions within the detection chamber that are below the threshold for complete dissolution of salt, thereby triggering a local dissolution process on the surface or crystal face of the salt crystals. A dissolution response sensor array is disposed within the detection chamber and arranged around the salt sample to be detected, for real-time acquisition of electrical response signals generated during the local dissolution process in different spatial directions; The sensing signal acquisition module is used to synchronously acquire the electrical response signal output by the dissolution response sensor array in time, and form dissolution response time-series data corresponding to different spatial directions. The response feature extraction module is used to compare and analyze the dissolution response change process in different spatial directions based on the dissolution response time series data, and extract response features that reflect the differences in the direction of salt crystal dissolution behavior. The quality judgment module is used to determine the crystal integrity and the degree of influence of impurities of the salt to be tested based on the response characteristics, and output the corresponding salt quality test results.

[0008] Further configuration: The environment construction module includes an environmental parameter monitoring unit and an environmental parameter adjustment unit. The environmental parameter monitoring unit is used to collect environmental parameters within the detection chamber and output environmental parameter data. The environmental parameter adjustment unit is signal-connected to the environmental parameter monitoring unit and adjusts the environmental parameters within the detection chamber based on the environmental parameter data. The environment construction module ensures that the environmental parameters within the detection chamber are within a range that are below the threshold for complete dissolution of salt and only cause localized dissolution on the surface or crystal face of the salt crystals.

[0009] By adopting the above technical solution, the environmental conditions involved in the detection process are kept stable and controllable, thereby ensuring the consistency and repeatability of the dissolution state of the salt sample during the detection period, reducing the random impact of environmental fluctuations on the detection results, and providing a reliable basis for obtaining the subsequent dissolution response.

[0010] Further configuration: The dissolution response sensor array includes multiple electrical sensing units distributed along the circumference or multiple spatial directions of the salt sample to be tested. Each electrical sensing unit is connected to the sensing signal acquisition module to output an electrical response signal in the corresponding spatial direction. The sensor signal acquisition module includes a multi-channel acquisition unit and a time synchronization unit. The multi-channel acquisition unit is used to receive electrical response signals from the multiple electrical sensing units, and the time synchronization unit is used to perform time alignment processing on the electrical response signals to construct dissolution response timing data.

[0011] By adopting the above technical solution, the system can simultaneously acquire dissolution response information from different spatial directions and ensure the consistency of response data in each direction in the time dimension, thereby providing complete and synchronous data support for subsequent analysis of spatial differences in dissolution behavior.

[0012] Further configuration: The dissolution response sensor array further includes an electric field response sensing unit, which is disposed in the detection cavity and connected to the sensing signal acquisition module. It is used to collect the local micro-electric field disturbance signal corresponding to the migration of sodium ions and chloride ions during the local dissolution of salt crystals under the environmental conditions formed by the environmental construction module.

[0013] By adopting the above technical solution, the detection process is no longer limited to the dissolution result, but can directly reflect the changes in the internal ion movement state during the dissolution process by sensing the ion migration behavior during the local dissolution of salt crystals. This enables the detection system to acquire information at the dissolution mechanism level, providing a new physical characterization basis for distinguishing the differences in dissolution behavior of different salt samples.

[0014] Further configuration: The sensing signal acquisition module or the response feature extraction module is configured to analyze the micro electric field disturbance signal, including at least phase difference analysis and spatial diffusion range analysis of the micro electric field disturbance signal in different spatial directions, so as to obtain electric field characteristic parameters characterizing the propagation characteristics of the micro electric field disturbance in different spatial directions.

[0015] By adopting the above technical solution, and by analyzing the phase difference and spatial diffusion characteristics of the micro electric field disturbance caused by ion migration, the electric field signal, which originally only showed amplitude changes, is transformed into structured information that can reflect its propagation direction and spatial distribution characteristics. This enhances the ability to characterize the spatial characteristics of ion migration behavior during dissolution and makes the electric field response under different dissolution states distinguishable.

[0016] Further configuration: The response feature extraction module includes a response data comparison unit, a feature parameter generation unit, and an electric field signal analysis unit. The response data comparison unit is used to compare data corresponding to different spatial directions in the dissolution response time series data. The feature parameter generation unit is used to generate dissolution response feature parameters based on the comparison processing results. The electric field signal analysis unit is used to generate electric field feature parameters based on the phase difference and spatial diffusion range of the micro-electric field disturbance signal. The dissolution response characteristic parameters and the electric field characteristic parameters together constitute the output parameter set of the response feature extraction module.

[0017] By adopting the above technical solution, the dissolution response characteristics that reflect external changes in dissolution behavior are unified with the electric field characteristics that reflect the internal ion migration state during dissolution. This enables the detection system to simultaneously characterize the apparent behavior and internal mechanism changes of the dissolution process within the same analytical framework. This provides a multi-dimensional and interrelated feature basis for subsequent judgment, avoiding the situation where a single feature cannot fully reflect the dissolution characteristics of table salt.

[0018] Further configuration: The quality judgment module includes a judgment parameter receiving unit and a judgment rule execution unit. The judgment parameter receiving unit is used to receive the parameter set output by the response feature extraction module, and the judgment rule execution unit is used to execute quality judgment rules based on the parameter set. The quality judgment rule includes determining the correspondence between the dissolution response characteristic parameters and the electric field characteristic parameters.

[0019] By adopting the above technical solution, quality judgment is made based on the correspondence between dissolution response characteristics and electric field characteristics. This makes the quality judgment process not only consider the independent changes of various characteristics, but also reflect the degree of correlation between different characteristics in the same dissolution process. As a result, the judgment results can reflect the consistency or deviation between dissolution behavior and ion migration behavior, thus improving the completeness of the quality judgment basis.

[0020] Further settings: The response feature extraction module is configured as follows: Within a preset detection time period, the values ​​of the dissolution response characteristic parameters and the electric field characteristic parameters in different time periods are organized into a time series to construct a corresponding feature evolution sequence; and the changing relationship between the dissolution response characteristic parameters and the electric field characteristic parameters corresponding to adjacent time periods in the feature evolution sequence is analyzed to form a time-series feature for characterizing the changes of the dissolution response characteristic parameters and the electric field characteristic parameters over time.

[0021] By adopting the above technical solution, and by analyzing the continuous changes of dissolution response characteristics and electric field characteristics during the detection period, the detection system can obtain dynamic evolution information of the dissolution process over time. This avoids the process differences that may be ignored when judging based solely on instantaneous characteristics, and enables quality judgment to be comprehensively analyzed in conjunction with the development trend of dissolution behavior.

[0022] Further configuration: The quality judgment rule further includes judgment based on the spatial distribution relationship between the dissolution response characteristic parameters and the electric field characteristic parameters corresponding to different spatial directions, wherein the spatial distribution relationship includes at least a spatial symmetry relationship or a spatial consistency relationship.

[0023] By adopting the above technical solution and introducing the spatial distribution relationship of characteristic parameters in different spatial directions as the basis for judgment, the detection system can perform constraint analysis on the dissolution behavior from the perspective of the overall spatial structure. This allows the judgment result to reflect the overall consistency or deviation of the dissolution behavior in space, further enhancing the ability to identify spatial differences in the dissolution characteristics of salt crystals.

[0024] Another objective of this invention is to provide a sensor-based method for detecting the quality of salt, which has the advantage of being able to detect and analyze the behavioral characteristics of salt crystals in the early stages of dissolution without damaging the salt crystal structure.

[0025] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A sensor-based method for detecting the quality of table salt includes the following steps: Step S1, Environment Construction Step: Through the environment construction module, the environmental parameters inside the detection chamber are adjusted so that the salt to be detected is in an environment where local dissolution occurs inside the detection chamber; Step S2, Dissolution Response Acquisition Step: Under the environmental conditions described in Step S1, the dissolution response signals generated by the salt to be detected in different spatial directions are acquired through a dissolution response sensor array; Step S3, Sensor signal acquisition step: The dissolution response signal acquired in step S2 is acquired and processed through the sensor signal acquisition module to form the corresponding dissolution response data; Step S4, Response Feature Extraction Step: The dissolution response data is processed by the response feature extraction module to extract response features that characterize the dissolution response behavior; Step S5, Quality Judgment Step: Based on the response features extracted in step S4, the quality of the salt to be tested is judged by the quality judgment module.

[0026] In summary, the present invention has the following beneficial effects: This invention provides a sensor-based salt quality detection system. By triggering the local dissolution process of salt crystals under environmental conditions below the complete dissolution threshold of salt, a dissolution response sensor array arranged around the salt sample to be tested is used to synchronously collect the dissolution response in different spatial directions. Based on the obtained dissolution response time-series data, response features reflecting the differences in the direction of dissolution behavior are extracted, thereby comprehensively judging the crystal integrity of salt and the degree of influence of impurities. By implementing the above technical solution, the present invention shifts the detection target from the traditional solution parameter detection to the behavior detection of salt crystals in the early stage of dissolution without damaging the overall structure of salt crystals. This allows the detection results to directly reflect the structural state of salt crystals and the influence of impurity salts on dissolution behavior.

[0027] Because the dissolution response sensor array synchronously senses local dissolution behavior in different spatial directions and extracts directional difference features by comparing and analyzing dissolution response time-series data, this invention can effectively distinguish salt samples with different crystal integrity or containing impurity salts. Even when the solution parameters are similar after complete dissolution, it can still accurately determine the quality of salt, thereby significantly improving the distinguishing ability and reliability of salt quality detection.

[0028] This invention achieves behavioral-level quality discrimination of salt crystal integrity and impurity influence by using a sensor array to synchronously sense and analyze the multi-directional response of salt crystals in the early stage of dissolution under incomplete dissolution conditions. This solves the problem in the prior art that it is difficult to reflect the structural behavior differences of salt crystals in the early stage of dissolution due to reliance on complete dissolution detection. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the system architecture of the present invention. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Example: A sensor-based salt quality detection system, such as Figure 1 As shown, it includes: The environment construction module is used to create environmental conditions within the detection chamber that are below the threshold for complete dissolution of salt, thereby triggering a local dissolution process on the surface or crystal face of the salt crystals. A dissolution response sensor array is disposed within the detection chamber and arranged around the salt sample to be detected, for real-time acquisition of electrical response signals generated during the local dissolution process in different spatial directions; The sensing signal acquisition module is used to synchronously acquire the electrical response signal output by the dissolution response sensor array in time, and form dissolution response time-series data corresponding to different spatial directions. The response feature extraction module is used to compare and analyze the dissolution response change process in different spatial directions based on the dissolution response time series data, and extract response features that reflect the differences in the direction of salt crystal dissolution behavior. The quality judgment module is used to determine the crystal integrity and the degree of influence of impurities of the salt to be tested based on the response characteristics, and output the corresponding salt quality test results.

[0032] The aforementioned modules are located within or connected to the detection chamber, and are interconnected via signal links to form a complete system operation chain. During operation, the system sequentially completes processes such as environment construction, dissolution response acquisition, signal timing construction, response feature extraction, and quality determination.

[0033] In this embodiment, the environment construction module is used to create environmental conditions within the detection chamber that can induce localized dissolution of the salt to be detected. The environment construction module includes an environmental parameter monitoring unit and an environmental parameter adjustment unit, which are connected via signals to form a closed-loop adjustment relationship.

[0034] The environmental parameter monitoring unit is used to collect environmental parameters related to the local dissolution process of salt within the detection chamber. These environmental parameters may include at least one or more of the following: Relative humidity RH (%): reflects the water vapor content in the detection chamber and is used to characterize the conditions for the formation of a thin water film or micro-condensation; Temperature T (°C): Used to characterize the saturation state and condensation tendency of water vapor in the cavity; Dew point temperature Td (°C): can be calculated from temperature and humidity data, and is used to characterize the critical state of "approaching condensation"; Airflow / wind speed v (m / s) or ventilation intensity index: used to characterize the convection intensity and water vapor distribution uniformity within the cavity; Cavity pressure P (kPa): Used to characterize the gas state changes within a closed cavity and to help determine the stability of water vapor migration; Relative humidity and temperature can be directly collected by temperature and humidity sensors; dew point temperature can be calculated by the environmental parameter monitoring unit or system controller based on temperature and humidity data.

[0035] The environmental parameter adjustment unit is used to adjust the environmental state within the detection chamber based on the environmental parameter data output by the environmental parameter monitoring unit. In one embodiment, the environmental parameter adjustment unit may include one or more of the following actuators: Humidification actuator: used to introduce water vapor into the detection chamber to increase the relative humidity; Dehumidification actuator: Used to reduce the water vapor content in the cavity, thereby lowering the relative humidity; Temperature regulation actuator: used to regulate the temperature inside the detection chamber, so that the state of the chamber is far from or close to the condensation criticality; Airflow regulation actuator: used to regulate the convection intensity within the cavity, stabilizing the water vapor distribution or creating a gradient; Valve-controlled / sealing actuators: used to adjust the ventilation or sealing of a cavity, thereby affecting the rate of humidity change.

[0036] In this embodiment, the environmental parameter adjustment unit adopts a closed-loop adjustment method: it receives environmental parameter data output by the environmental parameter monitoring unit in real time and keeps the cavity running within the local dissolution trigger window.

[0037] To ensure that the salt undergoes "partial dissolution" rather than "overall dissolution," this embodiment employs a control strategy of "approaching condensation but not forming free droplets," meaning that even when the cavity is in a state that satisfies the tendency to form a thin water film / micro-condensation, there is no significant droplet accumulation.

[0038] As an example, a control window can be described using the following logic: Maintain relative humidity in a high range, such as 70%–95%RH; To keep the dew point difference within a small positive range, such as 0.5℃ to 3℃; At the same time, the rate of humidity change is limited to a preset range to avoid rapid condensation or rapid drying that could cause the dissolution process to get out of control.

[0039] The above window is an example and can be adjusted according to factors such as cavity structure and sample volume.

[0040] The environmental parameter adjustment unit can perform adjustments according to the following control logic: When the relative humidity is detected to be below the lower limit of the target range, the humidification actuator is activated until the relative humidity returns to the target range. When the relative humidity is detected to be higher than the upper limit of the target range or the dew point difference is too small and close to 0, the dehumidification actuator is activated or the temperature is appropriately increased to bring the dew point difference back to the preset range. When airflow within the cavity is detected to cause unstable spatial distribution of relative humidity, the airflow actuator is adjusted to ensure that the convection intensity meets the set range. When an excessive rate of humidity change is detected, the ventilation intensity is reduced or the humidification / dehumidification is limited by the valve-controlled / closing actuator to make the humidity change process smoother.

[0041] During the construction of the aforementioned environment, due to the increased humidity within the detection chamber and the dew point difference being controlled within a small positive range, a thin water film or micro-condensed water layer easily forms on the surface of the salt crystals. Upon contact with the salt crystal surface, the thin water film causes localized dissolution in certain areas of the crystal surface, forming a trace salt solution layer. However, because the chamber as a whole does not generate a large number of free droplets and the temperature and humidity are confined within a preset window, the dissolution process is limited to the crystal surface or localized areas of the crystal face, preventing the salt from completely dissolving.

[0042] In this embodiment, to ensure that the subsequent dissolution response detection and quality assessment processes are carried out under the expected local dissolution state, the system also confirms whether the salt to be tested has entered a local dissolution state during the environment construction process. The confirmation of the local dissolution state is based on the changes in the sensing signals collected by the dissolution response sensor array.

[0043] During the gradual adjustment of environmental parameters within the detection chamber, the surface of salt crystals transitions from a dry state to a state of forming a thin water film or micro-condensation. Its dissolution behavior is reflected in the characteristic changes in the electrical response signal output by the dissolution response sensor array.

[0044] Therefore, this embodiment uses a comprehensive judgment of the changing trend, amplitude, and spatial distribution of the output signal of the dissolution response sensor array to confirm whether the salt to be detected is in a locally dissolved state.

[0045] In this embodiment, the confirmation of the localized dissolution state is based on at least one or more of the following sensing criteria: When the humidity inside the detection chamber gradually increases and approaches the local dissolution trigger condition, the electrical response signal output by at least some of the electrical sensing units in the dissolution response sensor array shows a continuous shift relative to the baseline state before the environment was constructed.

[0046] The sustained offset is characterized by a change in signal amplitude that does not return to the original baseline level for a period of time. This change is used as one of the preliminary criteria for the initiation of a dissolution reaction on the salt surface.

[0047] Under localized dissolution conditions, the dissolution response signal exhibits a relatively stable trend within a certain time window. That is, after the initial change, the signal enters a slow or quasi-stable state, rather than rapid and violent fluctuations.

[0048] Therefore, when the dissolution response signal maintains a continuous and gradual trend of change within a preset time period, it can be used as one of the criteria for determining whether a local dissolution state has been established.

[0049] In this embodiment, the dissolution response sensor array includes multiple electrical sensing units distributed in different spatial directions.

[0050] When a thin water film forms on the surface of salt and local dissolution occurs, the dissolution response signals in different spatial directions usually exhibit interrelated changes, such as changing synchronously in time or maintaining a consistent trend.

[0051] Therefore, when the dissolution response signals in multiple spatial directions show consistency in time and trend, this consistency can be used as an auxiliary criterion for confirming the local dissolution state.

[0052] To avoid misjudging other non-dissolving factors (such as environmental noise, transient humidity fluctuations, etc.) as a local dissolution state, this embodiment can also combine the following exclusionary criteria for judgment: If the dissolution response signal changes abruptly only for a very short time and then quickly returns to the original baseline state, the change is considered an environmental disturbance or transient interference and is not used as a basis for confirming the local dissolution state.

[0053] If the output signal of the electrical sensing unit corresponding to only a single spatial direction changes abnormally, while the signals of sensing units in other directions do not change accordingly, then this abnormal change is not considered a response caused by the overall local dissolution of salt.

[0054] In this embodiment, when at least one or more of the above-mentioned criteria for confirming partial dissolution are met, the system determines that the salt to be detected has entered a partial dissolution state.

[0055] After confirming the local dissolution state, the system maintains the current environmental parameters or enters a stable holding phase, and then initiates the subsequent dissolution response acquisition, response feature extraction, and quality assessment process.

[0056] It should be noted that the above criteria for confirming the local dissolution state are only used to illustrate the method for confirming the local dissolution state in this embodiment. The specific criteria can be adjusted according to the structure of the detection chamber, the type of sensor, and the morphology of the sample.

[0057] In this embodiment, the dissolution response sensor array includes multiple electrical sensing units, which are distributed along the circumference or multiple spatial directions of the salt sample to be tested.

[0058] Each electrical sensing unit is used to collect electrical response signals generated by the local dissolution of salt crystals in the corresponding spatial direction. The electrical response signals can be conductivity change signals or impedance change signals.

[0059] The sensor signal acquisition module includes a multi-channel acquisition unit and a time synchronization unit. The multi-channel acquisition unit is connected to each electrical sensing unit and is used to receive multiple electrical response signals. The time synchronization unit is used to perform time alignment processing on the multiple electrical response signals to construct the dissolution response timing data.

[0060] In this embodiment, the dissolution response sensor array further includes an electric field response sensing unit, which is disposed in the detection cavity and connected to the sensing signal acquisition module for acquiring the local micro-electric field disturbance signal corresponding to the migration of sodium ions and chloride ions during the local dissolution of salt crystals.

[0061] Under slightly humid conditions, local dissolution occurs on the surface of salt crystals. The migration behavior of ions within the dissolution area creates a change in the distribution of a weak electric field in space. The electric field response sensing unit is used to sense this micro-electric field disturbance and output the corresponding signal.

[0062] In this embodiment, the sensor signal acquisition module or response feature extraction module analyzes the acquired micro-electric field disturbance signal.

[0063] Specifically, phase difference analysis and spatial diffusion range analysis are performed on the micro-electric field disturbance signals collected in different spatial directions.

[0064] Phase differences can be obtained by comparing the phase angles of different electric field signals, and the spatial diffusion range can be characterized by the spatial distribution of micro electric field intensity.

[0065] For example, phase difference can be expressed as: ; : Represents the phase difference between the micro electric field disturbance signals corresponding to the i-th spatial direction and the j-th spatial direction, used to characterize the phase deviation of the micro electric field disturbance signals in different spatial directions; : Represents the phase value of the micro electric field disturbance signal acquired by the electric field response sensing unit set in the i-th spatial direction; : Represents the phase value of the micro electric field disturbance signal acquired by the electric field response sensing unit set in the j-th spatial direction; Subscripts i and j represent different spatial direction indices, corresponding to sensing units at different spatial locations in the dissolution response sensor array.

[0066] The spatial diffusion range can be expressed as a function of the micro-electric field intensity varying with spatial distance: ; in, : This parameter represents the spatial diffusion range of a micro-electric field disturbance, used to characterize the overall distribution characteristics of the micro-electric field intensity as it varies with spatial location; : This represents the value of the micro electric field intensity measured at a distance r from the center of the salt crystal or a reference position, and the micro electric field intensity is acquired by the electric field response sensing unit; r: represents the spatial distance variable relative to the reference position of the salt crystal; : Indicates the starting distance position for micro-electric field disturbance analysis; : Indicates the termination distance position of the micro-electric field disturbance analysis.

[0067] In this embodiment, the response feature extraction module includes a response data comparison unit, a feature parameter generation unit, and an electric field signal analysis unit.

[0068] The response data comparison unit is used to compare data corresponding to different spatial directions in the dissolution response time series data; the feature parameter generation unit is used to generate dissolution response feature parameters based on the comparison processing results; and the electric field signal analysis unit is used to generate electric field feature parameters based on phase difference and spatial diffusion range.

[0069] For example, the characteristic parameters of the dissolution response can be represented by the difference in the rate of change of the dissolution response in different directions: ; in, S: Represents the characteristic parameter of the dissolution response direction difference, used to characterize the degree of difference between the dissolution response change rates in different spatial directions; N: Represents the number of spatial directions involved in the dissolution response detection in the dissolution response sensor array; : Represents the dissolution response signal value acquired by the electrical sensing unit located in the i-th spatial direction; : Represents the rate of change of the dissolution response signal with time in the i-th spatial direction; : Represents the average rate of change of dissolution response in all spatial directions, used as a reference benchmark for calculating directional differences.

[0070] The dissolution response characteristic parameters and the electric field characteristic parameters together constitute the output parameter set of the response feature extraction module.

[0071] In this embodiment, the quality determination module includes a determination parameter receiving unit and a determination rule execution unit. The determination parameter receiving unit is used to receive the parameter set output by the response feature extraction module; the determination rule execution unit is used to execute quality determination rules based on the parameter set.

[0072] In this embodiment, after receiving the parameter set output by the response feature extraction module, the judgment rule execution unit in the quality judgment module executes the quality judgment rule on the parameter set to complete the judgment of the quality status of the salt to be tested.

[0073] The parameter set includes at least dissolution response characteristic parameters reflecting dissolution response behavior and micro-electric field characteristic parameters reflecting ion migration behavior. The decision rule execution unit does not make a judgment on a single parameter, but rather makes a comprehensive judgment based on the relationship between multiple features.

[0074] In this embodiment, the decision rule execution unit first compares the dissolution response features obtained in different spatial directions.

[0075] When the crystal structure and composition distribution of the salt to be tested are relatively uniform, the dissolution response in different spatial directions during local dissolution usually exhibits a relatively consistent trend. Therefore, if the dissolution response characteristics in each spatial direction reflected in the parameter set are consistent in both trend and relative amplitude, the judgment rule execution unit will use this characteristic as one of the criteria for determining the stability of the quality state.

[0076] Conversely, if there is a significant deviation between the dissolution response characteristics in different spatial directions, such as significant changes in the dissolution response in some directions while weaker changes in others, then this difference is considered a key feature that needs to be considered when determining quality.

[0077] In this embodiment, the decision rule execution unit also determines the correspondence between the dissolution response characteristic parameters and the micro-electric field characteristic parameters.

[0078] During normal local dissolution, there is usually a certain correspondence between the changes in the dissolution response and the ion migration behavior. That is, when the dissolution response is enhanced, it is accompanied by corresponding micro-electric field perturbation characteristics.

[0079] Therefore, when the changes in the parameters of the dissolution response characteristics and the changes in the micro-electric field characteristics are consistent in both spatial direction and temporal trend, the decision rule execution unit uses this correspondence as a positive basis for quality judgment.

[0080] If the dissolution response characteristics change but the micro-electric field characteristics do not show a corresponding change, or if the two are significantly inconsistent in spatial distribution, then this mismatch is considered as one of the abnormal characteristics in quality assessment.

[0081] In this embodiment, the decision rule execution unit can also determine the distribution of micro-electric field characteristics in different spatial directions.

[0082] When the local dissolution process of salt is relatively uniform, the micro-electric field disturbances caused by ion migration usually exhibit a relatively continuous or symmetrical spatial distribution. If the micro-electric field characteristics of the parameter set show a high degree of consistency in spatial distribution, this characteristic is used as one of the reference criteria for quality judgment.

[0083] Conversely, if the micro-electric field characteristics exhibit obvious discontinuities or local concentrations in spatial distribution, then these spatial distribution characteristics are used by the rule execution unit as important information reflecting spatial differences in dissolution behavior.

[0084] In this embodiment, the decision rule execution unit also makes a decision based on the stability characteristics of the parameter set during the detection time period.

[0085] When the dissolution response characteristics and micro-electric field characteristics maintain a relatively stable trend during the detection period, the judgment rule execution unit uses this stability characteristic as an auxiliary basis for quality judgment.

[0086] If the parameter set fluctuates frequently and significantly within a short period of time, this fluctuation characteristic is used as a quality judgment reference information that requires further evaluation or labeling.

[0087] In this embodiment, the decision rule execution unit does not output results in isolation based on a single decision rule, but rather performs a comprehensive analysis of the execution results of the above multiple decision rules.

[0088] Specifically, the judgment rule execution unit can comprehensively judge the quality status of the salt to be tested based on the results output by multiple judgment rules, and output the corresponding quality judgment result. The quality judgment result can be represented in the form of grade, category, or label.

[0089] The determination rule can be based on the correspondence between the dissolution response characteristic parameters and the electric field characteristic parameters, for example, by constructing a parameter correspondence matrix: ; in, Q: Represents the result value of the parameter correspondence formed by the dissolution response characteristic parameters and the micro-electric field characteristic parameters, which is used as one of the input parameters in the quality judgment module; f(·): represents the parameter mapping function, which describes the correspondence between the dissolution response characteristic parameters and the micro-electric field characteristic parameters. The specific form of the mapping function can be set according to the actual application requirements. S: Represents the characteristic parameter of the difference in the direction of the dissolution response; D: Indicates the spatial diffusion range parameter of the micro-electric field disturbance; : Represents the phase difference parameter of the micro-electric field disturbance signal.

[0090] In this embodiment, the response feature extraction module continuously collects the parameter set within a preset detection time period to construct the corresponding feature evolution sequence.

[0091] The relationship between the changes in characteristic parameters within adjacent time periods can be expressed as: ; in, : Indicates the amount of change between the corresponding result values ​​of parameters within adjacent time periods, used to characterize how parameters change over time; : Represents the result value of the parameter correspondence calculated in the t-th time period; : Represents the result value of the parameter correspondence calculated in the (t+1)th time period; Subscript t: indicates the time index in the feature evolution sequence.

[0092] The above method is used to form time-series features that characterize how parameters change over time.

[0093] In this embodiment, the quality determination rule further includes determining the spatial distribution relationship between parameter sets corresponding to different spatial directions.

[0094] Spatial distribution relationships include at least spatial symmetry relationships or spatial consistency relationships, which can be represented, for example, by the degree of dispersion between different directional parameters: ; in, C: Represents the spatial distribution dispersion parameter of the parameter correspondence result value in different spatial directions, used to characterize the distribution of the parameter in spatial directions; N: Represents the number of spatial directions involved in the spatial distribution analysis; : Represents the result of the parameter correspondence for the i-th spatial direction; : Represents the average value of the parameter correspondence results for all spatial directions; Subscript i: indicates spatial direction index.

[0095] Through the above embodiments, the present invention fully describes the entire process of environment construction, dissolution response acquisition, ion migration-induced micro-electric field disturbance detection, response feature extraction, and quality determination at the level of specific system structure and operation process.

[0096] The following describes in further detail the implementation process of a sensor-based salt quality detection method, including the following steps, in conjunction with specific embodiments of the system and the technical features defined in the dependent claims: Step 1: Environment Setup; In this embodiment, the salt sample to be tested is first placed in the testing chamber.

[0097] The environmental parameters within the detection chamber are adjusted through the system's environment construction module. In one implementation, the environment construction module may include an environmental parameter monitoring unit and an environmental parameter adjustment unit. The environmental parameter monitoring unit collects environmental parameter information within the detection chamber, and the environmental parameter adjustment unit adjusts the environmental parameters within the detection chamber based on this information.

[0098] In this embodiment, the environmental construction module ensures that the environmental parameters within the detection chamber are within a range that are below the threshold for complete dissolution of salt and only cause local dissolution on the surface or crystal face of the salt crystals.

[0099] Step 2: Acquisition of dissolution response; After completing the environment construction described in step one, the dissolution response of the salt to be tested is collected by the dissolution response sensor array set in the detection chamber.

[0100] In one embodiment, the dissolution response sensor array includes multiple electrical sensing units distributed along the circumference or multiple spatial directions of the salt sample to be tested, and each electrical sensing unit is used to collect electrical response signals in the corresponding spatial direction.

[0101] The above method can be used to obtain multiple dissolution response signals that reflect the dissolution response in different spatial directions.

[0102] Step 3: Constructing the dissolution response timeline; After acquiring multiple dissolution response signals in step two, the dissolution response signals are processed by the sensor signal acquisition module in the system.

[0103] In one implementation, the sensor signal acquisition module includes a multi-channel acquisition unit and a time synchronization unit. The multi-channel acquisition unit receives dissolution response signals from each electrical sensing unit, and the time synchronization unit performs time alignment processing on the multi-channel dissolution response signals to construct dissolution response timing data.

[0104] Step 4: Acquisition of micro-electric field perturbations induced by ion migration; In this embodiment, the dissolution response sensor array may further include an electric field response sensing unit.

[0105] Under the environmental conditions described in step one, the electric field response sensing unit is used to collect the micro electric field disturbance signal corresponding to the migration of sodium ions and chloride ions during the local dissolution of salt crystals, and output the micro electric field disturbance signal to the sensing signal acquisition module.

[0106] Step 5: Micro-electric field disturbance characteristic analysis; After acquiring the micro-electric field disturbance signal, the micro-electric field disturbance signal is analyzed by the sensor signal acquisition module or the response feature extraction module.

[0107] As one implementation method, the analysis of the micro-electric field disturbance signal includes at least phase difference analysis and spatial diffusion range analysis of the micro-electric field disturbance signal in different spatial directions, so as to generate corresponding micro-electric field characteristic parameters.

[0108] Step Six: Constructing the Response Feature Parameter Set; In this embodiment, the dissolution response time series data and micro-electric field characteristic parameters are processed by the response feature extraction module.

[0109] In one implementation, the response feature extraction module includes a response data comparison unit, a feature parameter generation unit, and an electric field signal analysis unit. The response data comparison unit is used to compare and process dissolution response data corresponding to different spatial directions, the feature parameter generation unit is used to generate dissolution response feature parameters, and the electric field signal analysis unit is used to generate electric field feature parameters.

[0110] The dissolution response characteristic parameters and the electric field characteristic parameters together form a parameter set.

[0111] Step 7: Quality assessment; After the parameter set is formed, it is processed by the quality judgment module.

[0112] In one implementation, the quality judgment module includes a judgment parameter receiving unit and a judgment rule execution unit. The judgment parameter receiving unit is used to receive the parameter set, and the judgment rule execution unit is used to execute the quality judgment rule based on the parameter set to determine the correspondence between the dissolution response characteristic parameters and the electric field characteristic parameters.

[0113] Step 8: Feature evolution analysis; In some implementations, the parameter set is continuously collected within a preset detection time period to construct a feature evolution sequence corresponding to the parameter set, and the relationship between the parameter sets in adjacent time periods is analyzed to obtain temporal features that reflect the changes of parameters over time.

[0114] Step Nine: Determining Spatial Distribution Relationships; In some implementations, during the quality determination process, the spatial distribution relationship of the parameter set in different spatial directions can also be determined based on the parameter set corresponding to different spatial directions. The spatial distribution relationship includes at least spatial symmetry relationship or spatial consistency relationship.

[0115] Specifically, in this embodiment, the application of this solution is illustrated using a batch quality inspection scenario in the salt production or distribution process as an example: The sample to be tested is a solid salt sample. For a single test, one or a combination of the following example conditions can be selected: Single or small amounts of crystalline salt samples, with each single crystal weighing approximately 0.5g to 5g; For granular or coarse salt samples, the sample volume is approximately 5 mL to 20 mL. The initial temperature of the sample is within the normal temperature range, for example, 15℃~30℃.

[0116] The salt sample does not require crushing, dissolving or other pretreatment; it is simply placed in the detection chamber in solid form.

[0117] In this embodiment, the detection cavity is a closed or semi-closed structure, and its internal space dimensions may be, for example: The effective internal volume is approximately 0.5L to 2L; The sample placement area is located at the center of the detection chamber or in a preset detection area.

[0118] The detection chamber is pre-integrated with an environment construction module, a dissolution response sensor array, and an electric field response sensing unit, with each module arranged spatially around the sample.

[0119] In this embodiment, after the detection begins, the environmental parameters within the detection chamber are adjusted through the environment construction module.

[0120] As an example: The relative humidity inside the detection chamber is gradually adjusted from the initial ambient humidity (e.g., 30%–50%RH) to a higher humidity range, such as 70%–95%RH; The ambient temperature is maintained within the normal range, such as 20℃~30℃.

[0121] Under the above environmental parameters, the surface of salt crystals gradually undergoes localized dissolution within tens of seconds to several minutes, while the overall structure remains solid.

[0122] The parameters above are for illustrative purposes only, and the specific values ​​can be adjusted according to the testing requirements.

[0123] In this embodiment, the dissolution response sensor array includes multiple electrical sensing units, which may be, for example, 4, 6 or 8, uniformly distributed along the circumference of the sample.

[0124] During local dissolution: The electrical response signals collected by each electrical sensing unit can be expressed as small changes in conductance or impedance; The signal sampling frequency can be set, for example, from 1Hz to 10Hz; The acquisition time for a single detection of the dissolution response can be, for example, 30s to 300s.

[0125] The sensor signal acquisition module synchronously acquires signals from each sensor unit and forms a corresponding dissolution response data sequence.

[0126] In this embodiment, the electric field response sensing unit is used to collect the micro-electric field disturbance signal corresponding to ion migration during the local dissolution of salt crystals.

[0127] As an example: The amplitude of the micro-electric field disturbance signal can be in the range of μV / cm to mV / cm; The distance between the electric field response sensing unit and the sample surface can be, for example, 1 mm to 10 mm; Micro-electric field disturbance signals and dissolution response signals can be acquired synchronously within the same time window.

[0128] The collected micro-electric field disturbance signals are then processed by the sensor signal acquisition module.

[0129] In this embodiment, the response feature extraction module processes the collected dissolution response data and micro-electric field disturbance data.

[0130] As an example: Response features can be extracted based on the changes in dissolution response in different spatial directions; Micro-electric field characteristics can be characterized based on micro-electric field perturbation signals in different spatial directions; The feature data is input into the quality assessment module in the form of parameters.

[0131] The quality assessment module executes the quality assessment rules based on the above features and outputs the corresponding quality assessment results, which may be represented in the form of numerical values, grades, or labels.

[0132] In this embodiment, the timescale of the entire detection process, from sample placement to result output, can be, for example, as follows: Environment setup phase: 30s~120s; Dissolution response acquisition phase: 30s~300s; Signal processing and determination phase: 1s to 10s; The total time for a single test can be controlled within the range of 1 to 10 minutes.

[0133] The parameters described above are exemplary parameters in specific application scenarios of the present invention, used to illustrate the operating state of the system and method in real applications. These parameters do not constitute a limitation on the scope of the claims, and those skilled in the art can adjust the parameter range according to actual testing needs.

[0134] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A sensor-based salt quality detection system, characterized in that, include: The environment construction module is used to create environmental conditions within the detection chamber that are below the threshold for complete dissolution of salt, thereby triggering a local dissolution process on the surface or crystal face of the salt crystals. A dissolution response sensor array is disposed within the detection chamber and arranged around the salt sample to be detected, for real-time acquisition of electrical response signals generated during the local dissolution process in different spatial directions; The sensing signal acquisition module is used to synchronously acquire the electrical response signal output by the dissolution response sensor array in time, and form dissolution response time-series data corresponding to different spatial directions. The response feature extraction module is used to compare and analyze the dissolution response change process in different spatial directions based on the dissolution response time series data, and extract response features that reflect the differences in the direction of salt crystal dissolution behavior. The quality judgment module is used to determine the crystal integrity and the degree of influence of impurities of the salt to be tested based on the response characteristics, and output the corresponding salt quality test results.

2. The sensor-based salt quality detection system according to claim 1, characterized in that, The environment construction module includes an environmental parameter monitoring unit and an environmental parameter adjustment unit. The environmental parameter monitoring unit is used to collect environmental parameters inside the detection chamber and output environmental parameter data. The environmental parameter adjustment unit is signal-connected to the environmental parameter monitoring unit and adjusts the environmental parameters inside the detection chamber based on the environmental parameter data. The environment construction module ensures that the environmental parameters within the detection chamber are within a range that are below the threshold for complete dissolution of salt and only cause localized dissolution on the surface or crystal face of the salt crystals.

3. The sensor-based salt quality detection system according to claim 1, characterized in that, The dissolution response sensor array includes multiple electrical sensing units distributed along the circumference or multiple spatial directions of the salt sample to be tested. Each electrical sensing unit is connected to the sensing signal acquisition module and is used to output an electrical response signal in the corresponding spatial direction. The sensor signal acquisition module includes a multi-channel acquisition unit and a time synchronization unit. The multi-channel acquisition unit is used to receive electrical response signals from multiple electrical sensing units, and the time synchronization unit is used to perform time alignment processing on the electrical response signals to construct dissolution response timing data.

4. The sensor-based salt quality detection system according to claim 3, characterized in that, The dissolution response sensor array further includes an electric field response sensing unit, which is disposed in the detection cavity and is connected to the sensing signal acquisition module. The electric field response sensing unit is used to collect the local micro electric field disturbance signal corresponding to the migration of sodium ions and chloride ions during the local dissolution of salt crystals under the environmental conditions formed by the environmental construction module.

5. The sensor-based salt quality detection system according to claim 4, characterized in that, The sensor signal acquisition module or the response feature extraction module is configured to analyze the micro electric field disturbance signal, including at least phase difference analysis and spatial diffusion range analysis of the micro electric field disturbance signal in different spatial directions, so as to obtain electric field characteristic parameters characterizing the propagation characteristics of the micro electric field disturbance in different spatial directions.

6. The sensor-based salt quality detection system according to claim 5, characterized in that, The response feature extraction module includes a response data comparison unit, a feature parameter generation unit, and an electric field signal analysis unit. The response data comparison unit is used to compare data corresponding to different spatial directions in the dissolution response time series data. The feature parameter generation unit is used to generate dissolution response feature parameters based on the comparison processing results. The electric field signal analysis unit is used to generate electric field feature parameters based on the phase difference and spatial diffusion range of the micro-electric field disturbance signal. The dissolution response characteristic parameters and the electric field characteristic parameters together constitute the output parameter set of the response feature extraction module.

7. The sensor-based salt quality detection system according to claim 6, characterized in that, The quality assessment module includes a assessment parameter receiving unit and an assessment rule execution unit. The assessment parameter receiving unit receives a parameter set output by the response feature extraction module, and the assessment rule execution unit executes quality assessment rules based on the parameter set. The quality judgment rule includes determining the correspondence between the dissolution response characteristic parameters and the electric field characteristic parameters.

8. A sensor-based salt quality detection system according to claim 6, characterized in that, The response feature extraction module is configured as follows: Within a preset detection time period, the values ​​of the dissolution response characteristic parameters and the electric field characteristic parameters in different time periods are organized into a time series to construct a corresponding feature evolution sequence; and the changing relationship between the dissolution response characteristic parameters and the electric field characteristic parameters corresponding to adjacent time periods in the feature evolution sequence is analyzed to form a time-series feature for characterizing the changes of the dissolution response characteristic parameters and the electric field characteristic parameters over time.

9. A sensor-based salt quality detection system according to claim 7, characterized in that, The quality judgment rule further includes a judgment based on the spatial distribution relationship between the dissolution response characteristic parameters and the electric field characteristic parameters corresponding to different spatial directions. The spatial distribution relationship includes at least a spatial symmetry relationship or a spatial consistency relationship.

10. A sensor-based method for detecting the quality of table salt, applied to the sensor-based table salt quality detection system described in any one of claims 1-9, characterized in that, Includes the following steps: Step S1, Environment Construction Step: Through the environment construction module, the environmental parameters inside the detection chamber are adjusted so that the salt to be detected is in an environment where local dissolution occurs inside the detection chamber; Step S2, Dissolution Response Acquisition Step: Under the environmental conditions described in Step S1, the dissolution response signals generated by the salt to be detected in different spatial directions are acquired through a dissolution response sensor array; Step S3, Sensor signal acquisition step: The dissolution response signal acquired in step S2 is acquired and processed through the sensor signal acquisition module to form the corresponding dissolution response data; Step S4, Response Feature Extraction Step: The dissolution response data is processed by the response feature extraction module to extract response features that characterize the dissolution response behavior; Step S5, Quality Judgment Step: Based on the response features extracted in step S4, the quality of the salt to be tested is judged by the quality judgment module.

Images