A method, apparatus and system for monitoring salt deposition

Abstract

The present disclosure relates to a salt deposition amount monitoring method, device and system. The method comprises: obtaining a salt deposition amount calibration value sequence determined based on a target environment in which a to-be-monitored object is located; calibrating a mapping relationship between a relative humidity of the target environment, an impedance modulus value of an interdigital electrode and a salt deposition amount according to the salt deposition amount calibration value sequence to obtain a relationship curve cluster; obtaining a current constant-frequency AC impedance modulus value and a current relative humidity of the target environment collected by the interdigital electrode; and determining a current salt deposition amount matched with the current constant-frequency AC impedance modulus value and the current relative humidity according to the relationship curve cluster. The present scheme improves the accuracy of salt deposition amount monitoring.

Description

Technical Field

[0001] This disclosure relates to the field of salt deposition monitoring technology, and in particular to a method, apparatus and system for monitoring salt deposition. Background Technology

[0002] In related technologies, the atmospheric environment in nearshore and marine areas often presents harsh conditions of high temperature, high humidity, and high salinity, posing a significant challenge to the long-term stable operation of industrial products, marine equipment, and marine engineering projects. Ocean activities such as seawater evaporation, ocean currents, and waves generate a large number of fine salt droplets, which enter the atmosphere with rising air currents and are transported and dispersed by atmospheric activity, forming salt fog. These fine droplets, distributed throughout nearshore and marine environments, settle due to their own gravity during transport, adhering to the surfaces of equipment and buildings to form crystalline salt. Under high humidity conditions, they absorb moisture and deliquesce, forming a thin film of salt solution. Combined with the combined effects of high temperature, this accelerates the aging of non-metallic materials and causes corrosion of metallic materials. Therefore, monitoring the amount of salt deposits in the atmospheric environment near the research object and the protected entity is of great significance for corrosion protection and local environmental control.

[0003] Currently, traditional methods for monitoring salt deposition typically rely on the fixed-frequency AC impedance modulus obtained by monitoring the object with interdigitated electrodes, as well as the fixed relationship between ambient relative humidity and interdigitated electrode impedance modulus, to determine the amount of salt deposition. This method is difficult to adapt to different monitoring objects under different environments, resulting in inaccurate monitoring results. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a method, apparatus and system for monitoring salt deposition.

[0005] According to a first aspect of the present disclosure, a method for monitoring salt deposition is provided, comprising:

[0006] Obtain a sequence of salt deposition calibration values ​​based on the target environment in which the monitored object is located;

[0007] Based on the salt deposition calibration value sequence, the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the salt deposition amount is calibrated to obtain a cluster of relationship curves;

[0008] Obtain the current fixed-frequency AC impedance modulus and current relative humidity of the target environment from the interdigitated electrodes;

[0009] The current salt deposition amount is determined based on the cluster of relationship curves, matching the current fixed-frequency AC impedance modulus and the current relative humidity.

[0010] According to a second aspect of the present disclosure, a salt deposition monitoring device is provided, comprising:

[0011] The first acquisition unit is used to acquire a sequence of salt deposition calibration values ​​determined based on the target environment in which the object to be monitored is located.

[0012] The calibration unit is used to calibrate the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the amount of salt deposition, based on the salt deposition calibration value sequence, to obtain a cluster of relationship curves.

[0013] The second acquisition unit is used to acquire the current fixed-frequency AC impedance modulus and the current relative humidity of the target environment collected by the interdigitated electrodes;

[0014] The determining unit is used to determine the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity based on the cluster of relationship curves.

[0015] According to a third aspect of the present disclosure, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described in any one of the first aspects.

[0016] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method as described in any one of the first aspects.

[0017] According to a fifth aspect of the present disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the method as described in any one of the first aspects.

[0018] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: by obtaining a salt deposition calibration value sequence determined based on the target environment in which the object to be monitored is located; by calibrating the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the salt deposition amount according to the salt deposition calibration value sequence, a cluster of relationship curves is obtained; the current fixed-frequency AC impedance modulus and the current relative humidity of the target environment collected by the interdigitated electrode are obtained; the current salt deposition amount matching the current fixed-frequency AC impedance modulus and the current relative humidity is determined according to the cluster of relationship curves, thereby using the calibration results matching the target environment to monitor the salt deposition amount, thus improving the accuracy of salt deposition amount monitoring.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] Figure 1 This is a flowchart illustrating a method for monitoring salt deposition according to an exemplary embodiment.

[0022] Figure 2 This is a schematic diagram of the structure of a salt deposition monitoring device shown in an embodiment of this disclosure.

[0023] Figure 3 This is a schematic diagram of the structure of the monitoring probe shown in the embodiments of this disclosure.

[0024] Figure 4 This is a schematic diagram of the impedance measurement circuit shown in an embodiment of this disclosure.

[0025] Figure 5 This is a schematic diagram illustrating the connection relationship between a resistor and a multiplexer chip in an embodiment of this disclosure.

[0026] Figure 6 This is a schematic diagram of the calibration space shown in the embodiments of this disclosure.

[0027] Figure 7 This is a block diagram illustrating a salt deposition monitoring device according to an exemplary embodiment.

[0028] Figure 8 This is a block diagram illustrating an apparatus for a method of monitoring salt deposition according to an exemplary embodiment.

[0029] Figure Labels

[0030] 1-Monitoring probe; 11-Interdigital electrode; 12-Temperature and humidity sensor chip; 13-PCB substrate; 14-Probe housing; 2-Operation button; 3-LED indicator; 4-USB data interface; 5-Power / signal output port. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0032] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0033] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the words “if” and “suppose” as used herein may be interpreted as “when”, “when”, or “in response to a determination”.

[0034] Furthermore, various forms of processes shown in the embodiments of this disclosure can be used to reorder, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and no limitation is imposed herein.

[0035] The atmospheric environment in nearshore and marine areas is often characterized by harsh conditions such as high temperature, high humidity, and high salinity, posing a significant challenge to the long-term stable operation of industrial products, marine equipment, and marine engineering projects. Ocean activities such as seawater evaporation, ocean currents, and waves generate a large number of fine salt droplets, which enter the atmosphere with rising air currents and are transported and dispersed by atmospheric activity, forming salt fog. These fine droplets, distributed throughout nearshore and marine environments, settle due to their own gravity during transport, adhering to the surfaces of equipment and buildings to form crystalline salt. Under high humidity conditions, they absorb moisture and deliquesce, forming a thin film of salt solution. Combined with the combined effects of high temperature, this accelerates the aging of non-metallic materials and causes corrosion of metallic materials. Therefore, monitoring the amount of salt deposits in the atmospheric environment near the research object and the protected entity is of great significance for corrosion protection and local environmental control.

[0036] Currently, traditional methods for monitoring salt deposition typically rely on the fixed-frequency AC impedance modulus obtained by monitoring the object with interdigitated electrodes, as well as the fixed relationship between ambient relative humidity and interdigitated electrode impedance modulus, to determine the amount of salt deposition. This method is difficult to adapt to different monitoring objects under different environments, resulting in inaccurate monitoring results.

[0037] To address the aforementioned issues, this disclosure provides a method, apparatus, and system for monitoring salt deposition. The method involves acquiring a salt deposition calibration value sequence determined based on the target environment of the object to be monitored; calibrating the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode, and the salt deposition based on the salt deposition calibration value sequence, thereby obtaining a cluster of relationship curves; acquiring the current fixed-frequency AC impedance modulus and current relative humidity of the target environment collected by the interdigitated electrode; and determining the current salt deposition matching the current fixed-frequency AC impedance modulus and current relative humidity based on the cluster of relationship curves. This allows for the use of calibration results matching the target environment to monitor salt deposition, thus improving the accuracy of salt deposition monitoring.

[0038] Figure 1 This is a flowchart illustrating a method for monitoring salt deposition according to an exemplary embodiment, such as... Figure 1 As shown, it should be noted that the salt deposition monitoring method of this disclosure is applied in a salt deposition monitoring device. Figure 1 As shown, the method may include the following steps 101-104:

[0039] Step 101: Obtain the salt deposition calibration value sequence determined based on the target environment in which the object to be monitored is located.

[0040] In one embodiment, the actual situation of the target environment to be monitored can be assessed in advance, such as nearshore indoor or outdoor environment, marine indoor or outdoor environment, etc., and the salt deposition calibration value sequence can be determined in combination with the required salt deposition monitoring accuracy.

[0041] For example, based on the mixed salt solution formulations provided in relevant industry standards, prepare simulated seawater solutions and dilute them at appropriate ratios, such as 10,000, 1,000, and 100 times. Roughly assess the target environment, such as nearshore shelter environments, or refer to salt deposition data obtained from traditional dry film or wet candle methods under similar conditions in the past. Combined with the monitoring duration, roughly determine the salt deposition amounts to be calibrated, such as 1 mg / m², 5 mg / m², 10 mg / m², 50 mg / m², 100 mg / m², 250 mg / m², and 500 mg / m².

[0042] Step 102: Based on the salt deposition calibration value sequence, the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the salt deposition amount is calibrated to obtain a cluster of relationship curves.

[0043] In one embodiment, since the mapping relationship between relative humidity, impedance modulus of interdigitated electrodes and salt deposition amount differs under different environments, this disclosure calibrates the mapping relationship between relative humidity, impedance modulus of interdigitated electrodes and salt deposition amount of the target environment before monitoring salt deposition amount in the target environment, thereby improving the accuracy of the monitoring results.

[0044] In one embodiment, a glass liquid-receiving frame can be pre-prepared. The glass liquid-receiving frame is rectangular, and the length and width of the rectangular holes inside the frame correspond to the length and width of the interdigitated electrode's coverage area. The width of the frame's border should not exceed 2 mm, and the thickness of the frame should not exceed 3 mm. The desired shape can be obtained by laser cutting on a glass sheet of appropriate thickness, thereby preparing the liquid-receiving frame.

[0045] In addition, as an example, a calibration interdigital electrode probe can be pre-fabricated. A liquid-receiving frame is bonded to the surface of the interdigital electrode, ensuring that the rectangular hole of the frame completely overlaps with the coverage area of ​​the interdigital electrode. A water-insoluble adhesive should be used for bonding, and the adhesive should completely fill the gap between the two bonding surfaces. The interdigital electrode with the bonded liquid-receiving frame is then soldered to the PCB substrate of the monitoring probe along with other components such as a temperature and humidity sensor chip. A standard coaxial cable is also soldered as a signal transmission line, with a length not exceeding 2m, thus preparing the calibration interdigital electrode probe.

[0046] In some embodiments of this disclosure, step 102 may specifically include the following steps:

[0047] Step a1: For each deposition calibration value in the salt deposition calibration value sequence, determine the solution volume based on the deposition calibration value, the interdigitated coverage area of ​​the interdigitated electrode, and the salt mass concentration.

[0048] The salt concentration refers to the salt concentration in the simulated seawater solution of the target environment.

[0049] In some embodiments of this disclosure, step a1 may specifically include:

[0050] Based on the deposition rate calibration, the interdigitated coverage area of ​​the interdigitated electrode, and the salt mass concentration, the solution volume is determined using the following formula:

[0051]

[0052] Where V is the solution volume, w is the sedimentation calibration value, S is the interdigitated coverage area of ​​the interdigitated electrode, and c is the mass concentration of the simulated seawater solution.

[0053] In one embodiment, a simulated seawater solution can be prepared based on a mixed salt solution formulation provided in relevant industry standards. The simulated seawater solution can be a solution with the same concentration as the mixed salt solution formulation, or it can be a diluted simulated seawater solution diluted by an appropriate factor.

[0054] Step a2: Place a simulated seawater solution corresponding to the volume of the solution on the interdigitated electrode, and dry the simulated seawater solution to obtain an interdigitated electrode covered with crystalline salt.

[0055] The crystalline salt was obtained by drying a simulated seawater solution.

[0056] In one embodiment, the interdigitated electrode carrying a simulated seawater solution (i.e., the calibration probe containing a convex liquid mass within the aforementioned liquid-receiving frame) can be transferred to a constant-temperature drying oven for drying. During the drying process, the interdigitated plane should remain horizontal. After drying, a known mass of salt will be evenly spread on the surface of the interdigitated electrode within the liquid-receiving frame to simulate the process of salt mist in the air naturally settling onto the surface of the interdigitated electrode in a real-world application scenario.

[0057] In some embodiments of this disclosure, the step a2 of placing the simulated seawater solution corresponding to the solution volume on the interdigitated electrode may specifically include: placing the simulated seawater solution corresponding to the solution volume in a liquid-receiving frame fixedly connected to the top of the interdigitated electrode; the bottom of the liquid-receiving frame is connected to the interdigitated surface of the interdigitated electrode, and a superhydrophobic coating is applied to the inner wall and the top of the liquid-receiving frame to ensure that the simulated seawater is evenly distributed in the liquid-receiving frame.

[0058] In one embodiment, the calibration probe can be pretreated by ultrasonically cleaning the interdigitated electrodes and the liquid-receiving frame with deionized water. The water temperature can be appropriately increased to achieve better cleaning results, followed by dust-free drying. A superhydrophobic coating is applied to the inner wall and upper surface of the liquid-receiving frame to prevent salt from adhering to the frame during subsequent drying, thus preventing errors in salt deposition.

[0059] In addition, a precision pipette can be used to titrate the calculated volume of simulated seawater solution or its dilution into the receiving frame. A suitable amount of deionized water is then added to the receiving frame. Under the combined effect of the superhydrophobic coating applied to the sidewalls of the receiving frame and the surface tension of the solution itself, the solution within the receiving frame forms a convex liquid mass with a bottom surface shape consistent with the area covered by the interdigitated electrodes. Except for the bottom surface covering the interdigitated electrode surface, the other surfaces of this liquid mass do not contact the receiving frame. The volume of added deionized water should be controlled so that the convex surface of the liquid mass is slightly lower than the upper surface of the receiving frame.

[0060] Step a3: Place the interdigitated electrode covered with crystalline salt in a constant temperature environment, control the humidity of the constant temperature environment according to multiple preset relative humidity values, monitor the AC impedance value corresponding to different relative humidity values, and obtain the AC impedance curve.

[0061] The AC impedance curve includes the mapping relationship between relative humidity and AC impedance.

[0062] In one embodiment, a calibration probe with a uniformly coated surface of crystalline salt on the interdigital electrode is placed in a constant temperature and humidity chamber. The interdigital plane is kept horizontal to prevent localized salt aggregation during the formation of a thin liquid film through directional flow of the liquid film caused by the crystalline salt absorbing moisture and deliquescing on the interdigital surface. The calibration probe is connected to the main unit of the monitoring device of this invention via a signal transmission line to collect AC impedance data and simultaneously record the temperature and relative humidity of the microenvironment near the probe. The temperature inside the constant temperature and humidity chamber is kept constant, while the relative humidity is increased incrementally in increments of 1% from 25% to 95%. After each increment, the current relative humidity needs to be maintained stable for at least 0.5 hours to ensure a dynamic balance between the deliquescence and moisture absorption process of the crystalline salt on the interdigital electrode surface and the evaporation process of the thin liquid film under the current relative humidity conditions. The AC impedance value of the interdigital electrode corresponding to each increment of relative humidity is stored.

[0063] Step a4: Determine the set of AC impedance curves corresponding to each deposition amount calibration value as a cluster of relationship curves.

[0064] In one embodiment, the cluster of relationship curves defines the calibration space for the salt deposition amount, impedance, and relative humidity of the interdigital electrode. As an example, for this calibration space, the effective range for salt deposition amount can be 0 to 1500 mg, the effective range for interdigital electrode impedance value can be 0 to 600 kΩ, and the effective range for ambient relative humidity can be 30% to 85%.

[0065] In some embodiments of this disclosure, after step a4, the method further includes fitting the cluster of relationship curves to obtain a fitted cluster of relationship curves;

[0066] Step 104 includes: determining the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity based on the fitting function.

[0067] In one embodiment, in order to simplify the function expression while ensuring fitting accuracy, a multi-segment polynomial fitting method based on relative humidity intervals can be used to fit the cluster of relationship curves to obtain a fitting function. Based on the fitting function, the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity can be determined.

[0068] Step 103: Obtain the current fixed-frequency AC impedance modulus and current relative humidity of the target environment collected by the interdigital electrodes.

[0069] In one embodiment, an online salt deposition monitoring device equipped with the aforementioned interdigitated electrodes can be placed in the target environment. Salt in the environment deposits on the surface of the interdigitated electrodes of the device and absorbs moisture from the air, deliquescing to form a thin liquid film. Depending on the relative humidity of the environment, when the moisture absorption and deliquescence of the deposited salt on the interdigitated electrode surface reaches equilibrium with the evaporation of moisture from the surface liquid film, the constant-frequency AC impedance modulus of the interdigitated electrodes will differ. The device monitors the constant-frequency AC impedance modulus of the interdigitated electrodes and the relative humidity of the microenvironment near the electrodes in real time, ensuring that data points fall within a defined calibration space. This allows for the acquisition of the real-time salt deposition amount on the interdigitated electrode surface, thus providing the salt deposition amount per unit area in the target environment.

[0070] In some embodiments of this disclosure, the above-mentioned online salt deposition monitoring device is as follows: Figure 2 , Figure 3 As shown, the device is an integrated unit, meaning the monitoring probe 1 is directly integrated into the main unit housing. It connects to the probe interface on the internal main control board via a wire on the back of the probe, forming a complete measurement loop. Besides the monitoring probe 1, other main components of the main unit include: an operation button 2 for restarting the device or forcing a salt deposition measurement; an LED indicator 3 for indicating the device's current operating status; a USB data interface 4 for copying stored monitoring data or rewriting parameter settings; and a power / signal output port 5, providing a secure and sealed cable outlet.

[0071] in, Figure 3 This is a schematic diagram of the interdigitated electrode monitoring probe used in the online salt deposition monitoring device. In this embodiment, the substrate material of the interdigitated electrode 11 is an aluminum nitride ceramic substrate with a surface roughness Ra of approximately 0.3 μm. A 200 nm thick Ti / W seed layer (titanium-tungsten alloy) is first deposited on the ceramic substrate using magnetron sputtering, and then a 2 μm thick noble metal Au is sputtered onto the seed layer to prepare the interdigitated electrode. The substrate thickness used in this embodiment is 0.5 mm, and the interdigital spacing is 0.3 mm, so that the temperature of the interdigitated electrode 11 remains consistent with the ambient temperature under complex temperature variations, while also having a large salt deposition measurement range. The temperature and humidity sensing chip 12 can be a commonly available model, and it is soldered to the same plane as the interdigitated electrode 11 on the PCB substrate 13 and close to each other. When the PCB substrate 13 is inserted into the insertion port at the tail of the probe housing 14, the temperature and humidity sensing chip 12 is located in the semi-open structure of the probe housing 14. At this time, a U-shaped groove is formed between the PCB substrate 13 and the probe housing 14. In order to prevent rainwater from accumulating for a long time, epoxy resin is used to pot the groove and the surface of the PCB substrate 13, so that the interdigitated surface, the epoxy resin potting layer and the probe housing 14 together form a continuous and smooth surface.

[0072] In other embodiments of this disclosure, the above-described online salt deposition monitoring device includes a main unit and a monitoring probe. The monitoring probe and the main unit are connected by a wire to form a measurement loop.

[0073] like Figure 4 As shown, the host unit may include a probe impedance measurement circuit, which includes a microcontroller unit, an excitation signal generation module, a probe access interface, a monitoring probe, an adaptive range selection module, and a response signal amplification and acquisition module. The excitation signal generation module generates a fixed-frequency AC signal, which is transmitted to the monitoring probe via the interface to generate a weak response signal. After amplification and acquisition, the weak response signal is transmitted to the host unit's processor (i.e., the microcontroller unit) for calculation and analysis to obtain the probe's impedance information. The adaptive range selection module automatically selects an appropriate measurement range based on the impedance value pre-analysis results for accurate measurement.

[0074] In some embodiments, the monitoring probe includes an aluminum nitride ceramic substrate interdigitated electrodes, a temperature and humidity sensing chip, a PCB substrate, a 3D-printed nylon shell, and an epoxy resin potting layer. The interdigitated electrodes and the temperature and humidity sensing chip are both fixed to pads on the same surface of the PCB substrate via solder paste. Since they are on the same sensing plane and closely spaced, they operate under the same ambient temperature and humidity conditions. The PCB substrate is inserted into a slot in the 3D-printed nylon shell and secured by the shell's stop structure and elastic locking tongue. The epoxy resin potting layer fills the gaps between the interdigitated electrodes, the PCB substrate, and the shell, forming a smooth, seamless surface together with the electrode surface and the shell surface, preventing rainwater accumulation from affecting monitoring.

[0075] In some embodiments, the interdigitated electrode includes an aluminum nitride ceramic substrate and an Au metal layer with a specific shape and structure formed on the surface of the ceramic substrate by magnetron sputtering. The Au metal layer has a structure including two rectangular pads, two long electrodes extending along the length of the substrate and connected to the two rectangular pads respectively, and an interdigitated structure extending along the width of the substrate, arranged in parallel and alternately and connected to the two long electrodes respectively.

[0076] In some embodiments, the monitoring probe can be an integrated unit with the main unit or a separate unit. An integrated probe can use ordinary copper wire to transmit impedance signals, and its length should not exceed 100mm. A separate probe must use a standard coaxial cable as the impedance signal transmission line, and its length should not exceed 2m.

[0077] In some embodiments, in the impedance measurement circuit, the excitation signal should be decoupled by a signal follower and then fed back to the microcontroller as a feedback signal to correct any distortion that may occur in the excitation signal.

[0078] In some embodiments, the interdigitated electrode substrate material is selected as an aluminum nitride ceramic substrate. This material has a low relative permittivity at the impedance signal measurement frequency used in the device of this invention, resulting in a higher initial impedance value for the interdigitated electrode and thus higher sensitivity of the monitoring probe for monitoring salt deposition. Aluminum nitride ceramic has high thermal conductivity, minimizing the temperature difference between the interdigitated electrode body and the ambient temperature in complex temperature-changing environments, reducing interference with the formation of a thin film of salt solution on the interdigitated electrode surface, and improving measurement accuracy. Aluminum nitride ceramic also exhibits excellent corrosion resistance, making the monitoring probe suitable for harsh marine environments.

[0079] In some embodiments, the surface roughness Ra of the interdigital electrode substrate is 0.3~0.5μm to prevent excessive roughness from hindering the spread of the thin liquid film formed by the deliquescence of deposited salt and affecting the accuracy of salt deposition measurement; at the same time, to prevent excessive smoothness from causing random agglomeration of the thin liquid film of salt solution on the surface of the interdigital electrode due to liquid surface tension during evaporation, forming local high-concentration liquid clusters.

[0080] In some embodiments, the thickness of the Au metal layer of the interdigitated electrode can be less than or equal to 5 μm to prevent the excessively thick interdigitated structure from hindering the spreading of the thin liquid film formed by the deliquescence of the deposited salt.

[0081] In some embodiments of this disclosure, prior to step 103, the method further includes:

[0082] Step b1: Predict the quantities one by one according to the multiple candidate ranges to obtain the prediction results;

[0083] Step b2: If the predicted quantity does not meet the preset conditions, the next range is used to make the predicted quantity until the predicted quantity meets the preset conditions. The range corresponding to the predicted quantity that meets the preset conditions is determined as the target range.

[0084] Step 103 may specifically include: acquiring the current fixed-frequency AC impedance modulus and current relative humidity of the target environment collected by the interdigitated electrodes according to the target range.

[0085] It should be noted that in applications involving salt deposition monitoring, salt deliquesces on the surface of the interdigital electrode of this invention, forming a thin liquid film that alters the electrode impedance modulus, ranging from tens of ohms to hundreds of thousands of ohms—a significant range. To ensure good accuracy in measuring the interdigital electrode impedance modulus across different magnitudes, the impedance modulus values ​​at different levels can be divided into several range settings, with adaptive range switching implemented during the measurement process.

[0086] In some embodiments of this disclosure, step b2, where the predicted value does not meet preset conditions, involves using the next measurement range for prediction. This may specifically include the following steps:

[0087] Obtain the upper limit value of the input voltage of the ADC pin in the signal amplifier acquisition unit;

[0088] If the amplitude of the response signal is greater than the upper limit, it is determined that the current candidate range is greater than the target range, that is, the predicted result does not meet the preset conditions.

[0089] If the amplitude of the response signal is less than the preset percentage of the upper limit, it is determined that the current candidate range is less than the target range, that is, the predicted result does not meet the preset conditions.

[0090] If the current candidate range is greater than the target range or less than the target range, the least binary method is used to determine the next range based on the current candidate range, and the next range is used for prediction.

[0091] It should be noted that the above percentage values ​​can be preset according to the actual situation. For example, if the amplitude of the response signal is less than one-tenth of the upper limit of the ADC pin input voltage, the current candidate range is determined to be less than the target range.

[0092] In one embodiment, regarding measurement program control, during a complete measurement of the interdigital electrode impedance modulus, the device first performs a prediction measurement at the default range, and then determines the switching direction of the gear based on the quality of the response signal during the prediction measurement. The gear is switched until the quality of the response signal meets the requirements, at which point the gear is the gear required for accurate measurement.

[0093] The default range can be preset to provide an initial value for the prediction process. Regarding the judgment of response signal quality, it is generally considered that a stable response signal with an amplitude V2 approximately half the upper limit of the ADC pin input voltage indicates good quality.

[0094] Therefore, in a single prediction process, the maximum output voltage of the ADC pin can be divided into 10 levels, with the lowest being level 1 and the highest being level 10. When generating the excitation signal, the amplitude V1 of the excitation signal increases step by step, and the quality of the response signal is judged at each level. When V1 is at level 1, if the amplitude of the response signal still exceeds the upper limit of the ADC pin input voltage, the current level is too high, and a lower level is switched and the prediction is repeated; when V1 is at level 10, if the amplitude of the response signal is still small, the current level is too low, and a higher level is switched and the prediction is repeated. When the level is switched to a suitable position, the formal measurement is performed, and the amplitude V1 of the excitation signal is increased step by step so that the amplitude V2 of the response signal is close to half of the upper limit of the ADC pin input voltage. At this time, the values ​​of V1, V2, and R can be used to determine the response signal quality. f Calculate the impedance magnitude of the interdigitated electrodes. In some embodiments of this disclosure, step b1 above may specifically include the following steps:

[0095] The control excitation signal generator outputs a first signal and a second signal; the first signal and the second signal are the same.

[0096] The interdigitated electrodes are controlled to receive a second signal, generate a response signal based on the second signal, and send the response signal to the signal amplifier and acquisition unit.

[0097] The control signal amplifier and acquisition unit selects a resistor whose resistance value matches the current range as the feedback resistor. The current amplification factor of the signal amplifier and acquisition unit is adjusted using the feedback resistor, and the response signal is amplified according to the current amplification factor to obtain the amplified response signal.

[0098] The magnitudes of the first signal and the amplified response signal are used as the prediction results.

[0099] Step b2 may specifically include: if the difference between the amplitude of the amplified response signal and the preset amplitude is greater than the preset difference, determining the next range based on the first signal and the amplified response signal, setting the current range as the next range, returning to the step of controlling the excitation signal generator to issue the first and second signals, until the difference is less than or equal to the preset difference, and setting the current range as the target range; wherein, the preset amplitude is half of the upper limit of the input voltage of the analog-to-digital converter (ADC) pin in the signal amplification and acquisition unit.

[0100] In one embodiment, in the online salt deposition monitoring device proposed in some embodiments of this disclosure, the excitation signal generator is implemented through a digital-to-analog converter (DAC) integrated in the MCU to generate a sinusoidal excitation signal according to a specified amplitude and frequency. The excitation signal passes through a voltage follower to improve the driving capability of the excitation signal while also buffering the signal and isolating the preceding and following circuits. Then, the excitation signal is split into two paths: one path is directly fed back to the MCU-integrated ADC as analog input signal number 1 (i.e., the first signal); the other path (i.e., the second signal) passes through the probe access interface and the interdigital electrode monitoring probe to generate a weak response signal (i.e., the aforementioned corresponding signal), which is then input to the signal amplification and acquisition unit.

[0101] The signal amplifier and acquisition unit consists of a signal amplification section and a signal acquisition section. The signal acquisition section is implemented using an ADC. The weak response signal is amplified by the signal amplification section to generate a strong response signal, which is then input into the ADC as the second analog input signal (i.e., the amplified response signal mentioned above).

[0102] For the signal amplification section, this part mainly consists of an operational amplifier-based inverting amplifier circuit. The feedback resistor R in the inverting amplifier circuit... f It is not a fixed resistor, but an adaptive range selector composed of multiple resistors of different values ​​and a multiplexer, with the structure as follows: Figure 5 As shown, each resistor occupies one channel of the multiplexer, and each channel represents a range. R f A higher resistance value indicates a higher range, and a lower resistance value indicates a lower range. In a specific impedance measurement process, the MCU can control the multiplexer chip via the range selection signal to select one of the resistors as the feedback resistor R for that measurement. f This allows for the selection of the measurement range for this measurement.

[0103] In one embodiment, the amplitude of the excitation signal (i.e., analog input signal 1) is V1, the amplitude of the strong response signal (i.e., analog input signal 2) is V2, and the impedance magnitude of the interdigitated electrode is |Z|. Then, these three values, along with R... f The following relation exists:

[0104]

[0105] The value ranges of V1 and V2 depend on the pin output characteristics of the DAC and ADC. Therefore, the hardware characteristics also determine the value ranges of V1 / V2, which, in conjunction with appropriate R... f The resistance value allows for the measurement of the impedance modulus of interdigitated electrodes of different magnitudes with good accuracy.

[0106] Step 104: Determine the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity based on the cluster of relationship curves.

[0107] In one embodiment, by placing the data points formed by the current fixed-frequency AC impedance modulus and the current relative humidity within the calibration space formed by the cluster of relationship curves, the real-time salt deposition amount on the interdigitated electrode surface can be obtained, thus yielding the salt deposition amount per unit area of ​​the target environment.

[0108] As an example, the calibration space formed by the cluster of relation curves is as follows: Figure 6 As shown.

[0109] According to the salt deposition monitoring method proposed in this disclosure, a salt deposition calibration value sequence determined based on the target environment of the object to be monitored is obtained; based on the salt deposition calibration value sequence, the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode, and the salt deposition is calibrated to obtain a cluster of relationship curves; the current fixed-frequency AC impedance modulus and current relative humidity of the target environment are obtained from the interdigitated electrode; the current salt deposition is determined based on the cluster of relationship curves to match the current fixed-frequency AC impedance modulus and current relative humidity, thereby using the calibration results matched with the target environment to monitor the salt deposition, thus improving the accuracy of salt deposition monitoring.

[0110] Figure 7 This is a block diagram illustrating a salt deposition monitoring device according to an exemplary embodiment. (Refer to...) Figure 7 The device includes a first acquisition unit 701, a calibration unit 702, a second acquisition unit 703, and a determination unit 704.

[0111] The first acquisition unit 701 is used to acquire a salt deposition calibration value sequence determined based on the target environment where the object to be monitored is located.

[0112] The calibration unit 702 is used to calibrate the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the amount of salt deposition based on the salt deposition calibration value sequence, and to obtain a cluster of relationship curves.

[0113] The second acquisition unit 703 is used to acquire the current fixed-frequency AC impedance modulus and the current relative humidity of the target environment collected by the interdigital electrodes;

[0114] The determination unit 704 is used to determine the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity based on the cluster of relationship curves.

[0115] In some embodiments of this disclosure, the calibration unit 702 may specifically be used for:

[0116] For each sedimentation calibration value in the salt deposition calibration value sequence, the solution volume is determined based on the sedimentation calibration value, the interdigitated coverage area of ​​the interdigitated electrode, and the salt mass concentration; the salt mass concentration is the salt mass concentration in the simulated seawater solution of the target environment.

[0117] A simulated seawater solution corresponding to the volume of the solution was placed on the interdigitated electrode, and the simulated seawater solution was dried to obtain an interdigitated electrode covered with crystalline salt; the crystalline salt was obtained after drying the simulated seawater solution.

[0118] The interdigitated electrode covered with crystalline salt was placed in a constant temperature environment. The humidity of the constant temperature environment was controlled according to multiple preset relative humidity values. The AC impedance value corresponding to different relative humidity values ​​was monitored to obtain the AC impedance curve. The AC impedance curve includes the mapping relationship between the relative humidity value and the AC impedance value.

[0119] The set of AC impedance curves corresponding to each sedimentation amount calibration value is determined as the relationship curve cluster.

[0120] In some embodiments of this disclosure, the calibration unit 702 may be specifically used to: place a simulated seawater solution corresponding to the solution volume into a liquid-receiving frame fixedly connected to the top of the interdigitated electrode; the bottom of the liquid-receiving frame is connected to the interdigitated surface of the interdigitated electrode, and the inner wall and the top of the liquid-receiving frame are coated with a superhydrophobic coating so that the simulated seawater is evenly distributed in the liquid-receiving frame.

[0121] In some embodiments of this disclosure, the calibration unit 702 may specifically be used to: determine the solution volume based on the deposition amount calibration value, the interdigital coverage area of ​​the interdigital electrode, and the mass concentration of the salt using the following formula:

[0122]

[0123] Where V is the solution volume, w is the sedimentation calibration value, S is the interdigitated coverage area of ​​the interdigitated electrode, and c is the mass concentration of the simulated seawater solution.

[0124] In some embodiments of this disclosure, the interdigitated electrode includes multiple measurement ranges, and the method further includes a prediction unit, which is specifically used for:

[0125] Predict the quantity one by one according to multiple candidate ranges to obtain the prediction result;

[0126] If the predicted value does not meet the preset conditions, the next range is used for prediction until the predicted value meets the preset conditions. The range corresponding to the predicted value that meets the preset conditions is then determined as the target range.

[0127] The second acquisition unit 703 may include:

[0128] Acquire the current fixed-frequency AC impedance modulus and current relative humidity of the target environment by the interdigitated electrodes according to the target range.

[0129] In some embodiments of this disclosure, the prediction unit can specifically be used for:

[0130] The control excitation signal generator outputs a first signal and a second signal; the first signal and the second signal are the same.

[0131] The interdigitated electrodes are controlled to receive a second signal, generate a response signal based on the second signal, and send the response signal to the signal amplifier and acquisition unit.

[0132] The control signal amplifier selects a resistor whose resistance value matches the current range as a feedback resistor. The feedback resistor is used to adjust the current amplification factor of the signal amplifier, and the signal is amplified according to the current amplification factor to obtain the amplified response signal.

[0133] The magnitudes of the first signal and the amplified response signal are used as the prediction results.

[0134] If the difference between the amplitude of the amplified response signal and the preset amplitude is greater than the preset difference, the next range is determined based on the first signal and the amplified response signal. The current range is then determined as the next range, and the process of controlling the excitation signal generator to issue the first and second signals is repeated until the difference is less than or equal to the preset difference. The current range is then determined as the target range. The preset amplitude is half of the upper limit of the input voltage of the analog-to-digital converter (ADC) pin in the signal amplification and acquisition unit.

[0135] In some embodiments of this disclosure, the calibration unit 702 may specifically be used for:

[0136] The relationship curve family is fitted to obtain the corresponding fitting function;

[0137] The current salt deposition amount, matched to the current constant-frequency AC impedance modulus and the current relative humidity, is determined based on the cluster of relationship curves, including:

[0138] The current salt deposition amount is determined based on the fitting function, matching the current constant-frequency AC impedance modulus and the current relative humidity.

[0139] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0140] According to the salt deposition monitoring device proposed in this embodiment, a salt deposition calibration value sequence determined based on the target environment of the object to be monitored is obtained; based on the salt deposition calibration value sequence, the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode, and the salt deposition is calibrated to obtain a cluster of relationship curves; the current fixed-frequency AC impedance modulus and the current relative humidity of the target environment are obtained from the interdigitated electrode; the current salt deposition is determined based on the cluster of relationship curves to match the current fixed-frequency AC impedance modulus and the current relative humidity, thereby using the calibration results matched with the target environment to monitor the salt deposition, thus improving the accuracy of salt deposition monitoring.

[0141] Figure 8 This is a block diagram illustrating an apparatus for a method of monitoring salt deposition according to an exemplary embodiment. For example, apparatus 800 may be an electronic device, such as a mobile phone, computer, digital broadcasting terminal, messaging device, tablet device, personal digital assistant, etc.

[0142] Reference Figure 8 The device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0143] Processing component 802 typically controls the overall operation of device 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 802 may include one or more processors 820 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0144] Memory 804 is configured to store various types of data to support the operation of device 800. Examples of this data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0145] The power supply component 806 provides power to the various components of the device 800. The power supply component 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power to the device 800.

[0146] Multimedia component 808 includes a screen that provides an output interface between the device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the device 800 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0147] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0148] Sensor assembly 814 includes one or more sensors for providing status assessments of various aspects of device 800. For example, sensor assembly 814 may detect the on / off state of device 800, the relative positioning of components, changes in the position of device 800 or a component of device 800, the presence or absence of user contact with device 800, and temperature changes of device 800. In some embodiments, sensor assembly 814 may include a temperature sensor.

[0149] Communication component 816 is configured to facilitate wired or wireless communication between device 800 and other devices. Device 800 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0150] In an exemplary embodiment, the apparatus 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0151] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, which can be executed by a processor 820 of the device 800 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0152] In an exemplary embodiment, a computer program product is also provided, including a computer program that implements the above-described method when executed by a processor 820 of a device 800.

[0153] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0154] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for monitoring salt deposition, characterized in that, include: Obtain a sequence of salt deposition calibration values ​​based on the target environment in which the monitored object is located; Based on the salt deposition calibration value sequence, the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the salt deposition amount is calibrated to obtain a cluster of relationship curves; Obtain the current fixed-frequency AC impedance modulus and current relative humidity of the target environment from the interdigitated electrodes; The current salt deposition amount is determined based on the cluster of relationship curves, matching the current fixed-frequency AC impedance modulus and the current relative humidity. The interdigitated electrode includes multiple measurement ranges; before acquiring the current fixed-frequency AC impedance modulus and current relative humidity of the target environment collected by the interdigitated electrode, the method further includes: Predict the quantity one by one according to multiple candidate ranges to obtain the prediction result; If the predicted value does not meet the preset conditions, the next range is used to make the prediction until the predicted value meets the preset conditions. The range corresponding to the predicted value that meets the preset conditions is determined as the target range. The acquisition of the current fixed-frequency AC impedance modulus and current relative humidity of the target environment collected by the interdigitated electrodes includes: Obtain the current fixed-frequency AC impedance modulus and current relative humidity of the target environment as collected by the interdigitated electrodes according to the target range; The step of predicting the quantity one by one according to the multiple candidate ranges to obtain the prediction result includes: The control excitation signal generator emits a first signal and a second signal; the first signal and the second signal are the same. The interdigitated electrodes are controlled to receive the second signal, generate a response signal based on the second signal, and send the response signal to a signal amplifier and acquisition unit. The signal amplification and acquisition unit is controlled to select a resistor whose resistance value matches the current range as a feedback resistor. The current amplification factor of the signal amplification and acquisition unit is adjusted using the feedback resistor, and the response signal is amplified according to the current amplification factor to obtain the amplified response signal. The magnitudes of the first signal and the amplified response signal are used as the prediction result. The step of using the next range for prediction when the predicted result does not meet the preset conditions, until the predicted result meets the preset conditions, and determining the range corresponding to the predicted result that meets the preset conditions as the target range, includes: If the difference between the amplitude of the amplified response signal and the preset amplitude is greater than the preset difference, the next range is determined based on the first signal and the amplified response signal. The current range is then determined as the next range, and the process of controlling the excitation signal generator to emit the first and second signals is repeated until the difference is less than or equal to the preset difference. The current range is then determined as the target range. The preset amplitude is half of the upper limit of the input voltage of the analog-to-digital converter (ADC) pin in the signal amplification and acquisition unit.

2. The method for monitoring salt deposition according to claim 1, characterized in that, The process involves calibrating the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode, and the amount of salt deposition based on the salt deposition calibration value sequence, resulting in a set of relationship curves, including: For each sedimentation calibration value in the salt deposition calibration value sequence, the solution volume is determined based on the sedimentation calibration value, the interdigitated coverage area of ​​the interdigitated electrode, and the salt mass concentration; the salt mass concentration is the salt mass concentration in the simulated seawater solution of the target environment. The simulated seawater solution corresponding to the volume of the solution is placed on the interdigitated electrode, and the simulated seawater solution is dried to obtain an interdigitated electrode covered with crystalline salt; the crystalline salt is obtained after drying the simulated seawater solution; The interdigitated electrode covered with crystalline salt is placed in a constant temperature environment, and the humidity of the constant temperature environment is controlled according to multiple preset relative humidity values. The AC impedance values ​​corresponding to different relative humidity values ​​are monitored to obtain AC impedance curves. The AC impedance curves include the mapping relationship between relative humidity values ​​and AC impedance values. The set of AC impedance curves corresponding to each deposition amount calibration value is determined as the relationship curve cluster.

3. The method for monitoring salt deposition according to claim 2, characterized in that, The step of placing the simulated seawater solution corresponding to the volume of the solution on the interdigitated electrode includes: The simulated seawater solution corresponding to the volume of the solution is placed in a liquid-receiving frame that is fixedly connected to the top of the interdigitated electrode; the bottom of the liquid-receiving frame is connected to the interdigitated surface of the interdigitated electrode, and the inner wall and the top of the liquid-receiving frame are coated with a superhydrophobic coating so that the simulated seawater is evenly distributed in the liquid-receiving frame.

4. The salt deposition monitoring method according to claim 2, characterized in that, The determination of solution volume based on the deposition amount calibration value, the interdigitated coverage area of ​​the interdigitated electrode, and the salt mass concentration includes: Based on the deposition rate calibration, the interdigitated coverage area of ​​the interdigitated electrode, and the salt mass concentration, the solution volume is determined using the following formula: Wherein, V is the solution volume, w is the sedimentation calibration value, S is the interdigitated coverage area of ​​the interdigitated electrode, and c is the mass concentration of the simulated seawater solution.

5. The method for monitoring salt deposition according to claim 2, characterized in that, After determining the set of AC impedance curves corresponding to each deposition amount calibration value as the relationship curve cluster, the method further includes: The relationship curve cluster is fitted to obtain the fitting function corresponding to the relationship curve cluster. Determining the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity based on the cluster of relationship curves includes: The current salt deposition amount is determined based on the fitting function, matching the current fixed-frequency AC impedance modulus and the current relative humidity.

6. A salt deposition monitoring device, characterized in that, The method described by any one of claims 1-5 includes: The first acquisition unit is used to acquire a sequence of salt deposition calibration values ​​determined based on the target environment in which the object to be monitored is located. The calibration unit is used to calibrate the mapping relationship between the relative humidity of the target environment, the impedance modulus of the interdigitated electrode and the amount of salt deposition, based on the salt deposition calibration value sequence, to obtain a cluster of relationship curves. The second acquisition unit is used to acquire the current fixed-frequency AC impedance modulus and the current relative humidity of the target environment collected by the interdigitated electrodes; The determining unit is used to determine the current salt deposition amount that matches the current fixed-frequency AC impedance modulus and the current relative humidity based on the cluster of relationship curves.

7. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 5.

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