A salt mist concentration detection device and method based on high-pressure air breakdown characteristics

Abstract

The application relates to a salt mist concentration detection device and method based on high-pressure air breakdown characteristics, which comprises an electrode assembly, the electrode assembly comprising at least one pair of oppositely arranged electrodes with adjustable spacing, a gap being formed between the electrodes for air discharge; a high-voltage power supply module for outputting adjustable high-voltage electric signals; and a detection module for detecting electric signals generated when air discharge or breakdown occurs between the electrodes under the action of the high-voltage electric signals, and collecting breakdown characteristic parameters related to the air discharge or breakdown. In the detection process, no complex pretreatment steps are required, air discharge or breakdown can be triggered by applying a high-voltage electric field between the oppositely arranged electrodes, the related breakdown characteristic parameters can be collected and processed in a very short time, the overall detection response speed is fast, the single detection time can be controlled within 1 second, and the change of the salt mist concentration in the air can be timely reflected.

Description

Technical Field

[0001] This application relates to the field of salt spray concentration detection technology, and in particular to a salt spray concentration detection device and method based on the high-pressure air breakdown characteristics. Background Technology

[0002] Existing methods for detecting salt spray concentration mainly include gravimetric analysis, ion chromatography, and optical particle detection. Gravimetric and ion chromatography are complex and time-consuming, requiring sampling; optical methods are expensive and significantly affected by humidity. The electrical breakdown characteristics of air are closely related to gas composition and suspended particulate matter. When salt spray (charged or easily ionized particles such as Na⁺ and Cl⁻) is present in the air, the equivalent ionization rate of the air increases, making it easier for the gas to break down under the same gap conditions. This leads to: a decrease in breakdown voltage; changes in discharge current pulse characteristics; and an increase in the critical breakdown gap under constant voltage. These breakdown behaviors show a regularity with salt spray concentration. Therefore, if these breakdown characteristic parameters can be collected and analyzed, a real-time detection method for salt spray concentration can be established. However, existing literature does not provide a real-time quantitative detection scheme for salt spray based on gas breakdown behavior, nor does it propose a system that can achieve rapid, online, and low-cost monitoring. Therefore, it is necessary to develop a simple, fast-responding, stable, and reliable salt spray concentration detection device and method. Summary of the Invention

[0003] To address the problems of slow detection speed, complex equipment structure, and high cost of existing smoke concentration detection methods mentioned in the background art, this application provides a salt spray concentration detection device and method based on the high-pressure air breakdown characteristics.

[0004] The salt spray concentration detection device and method based on high-pressure air breakdown characteristics provided in this application adopts the following technical solution: A salt spray concentration detection device based on high-pressure air breakdown characteristics, comprising: An electrode assembly comprising at least a pair of opposing electrodes with an adjustable spacing, wherein a gap for air discharge is formed between the electrodes; High-voltage power supply module, used to output adjustable high-voltage electrical signals; The detection module is used to detect the electrical signal generated when air discharges or breaks down between electrodes under the action of a high voltage signal, and to collect breakdown characteristic parameters related to the discharge or breakdown. The data processing unit, electrically connected to the detection module, is used to process the collected breakdown characteristic parameters based on a pre-established correspondence model between the breakdown characteristic parameters and the salt spray concentration, and obtain the detection result of the salt spray concentration in the air.

[0005] By adopting the above technical solution, the change in electrical properties generated during high-voltage air discharge or breakdown is used to characterize the salt spray concentration in the air, realizing a salt spray concentration detection method that does not require sampling or chemical reagents. Compared with traditional gravimetric methods, chemical analysis methods or optical detection methods, the structure is simpler, the detection process has a faster response speed, and it has the ability to monitor online and in real time, reducing equipment costs and usage complexity.

[0006] Optionally, the electrode assembly is a needle-plate electrode structure, a ball-plate electrode structure, a plate-plate electrode structure, or a coaxial electrode structure.

[0007] By adopting the above technical solutions, appropriate electrode forms can be flexibly selected according to different detection environments and detection needs to obtain different electric field distribution characteristics, thereby improving the stability and repeatability of air discharge or breakdown processes and expanding the applicable range of salt spray concentration detection.

[0008] Optionally, the high-voltage power supply module outputs a high-voltage electrical signal that is a DC high-voltage, AC high-voltage, pulse high-voltage, or radio frequency high-voltage.

[0009] By adopting the above technical solution, different discharge methods can be adapted according to requirements, and air discharge or breakdown characteristic parameters can be obtained under different electric field application modes. This facilitates parameter selection for different salt spray environments and detection conditions, and improves the flexibility of the detection method.

[0010] Optionally, the detection module includes at least one of a voltage acquisition unit, a current acquisition unit, and a gap measurement unit.

[0011] By adopting the above technical solutions, key electrical parameters during air discharge or breakdown can be collected from different dimensions, avoiding errors caused by relying on a single detection quantity and improving the accuracy of salt spray concentration detection.

[0012] Optionally, the data processing unit includes a signal amplification circuit, an analog-to-digital conversion module, and a microprocessor. The microprocessor is used to process the collected breakdown characteristic parameters and obtain the salt spray concentration detection results according to the pre-established corresponding model.

[0013] By adopting the above technical solution, the effective acquisition and processing of discharge signals are realized, and the salt spray concentration detection results can be directly output according to the pre-established correspondence, which makes the detection process highly automated, reduces manual intervention, and improves detection efficiency.

[0014] This application also provides a salt spray concentration detection method based on high-pressure air breakdown characteristics, which is applied to the above-mentioned salt spray concentration detection device and includes the following steps: Step 1: Apply a high-voltage electric field capable of inducing air surface discharge or gap breakdown between the relatively arranged electrode components using a high-voltage power supply module. Step 2: Under the action of a high-voltage electric field, the detection module detects the electrical signals generated when air discharge or breakdown occurs between the electrode components and collects the corresponding breakdown characteristic parameters. The breakdown characteristic parameters include at least one of breakdown voltage, breakdown current characteristics, discharge initiation delay time, critical breakdown gap, and discharge energy. Step 3: Input the breakdown characteristic parameters collected by the detection module into the data processing unit, and establish the correspondence between the breakdown characteristic parameters and the salt spray concentration in the data processing unit based on the data obtained under standard experimental conditions. Step 4: The data processing unit processes the breakdown characteristic parameters according to the correspondence described in Step 3 to obtain the salt spray concentration in the air in real time.

[0015] By adopting the above technical solution, the physical phenomenon that air is prone to discharge or breakdown under the action of a high-voltage electric field is used to indirectly reflect the amount of salt spray in the air. When the salt spray concentration in the air is high, charged particles are more likely to appear in the air, making it easier for the air to discharge or break down under the same conditions. This is manifested as a decrease in breakdown voltage, easier discharge, or changes in discharge characteristics. In other words, by detecting these discharge or breakdown characteristic parameters that change with the salt spray concentration, the salt spray concentration in the air can be deduced. There is no need to sample or chemically analyze the air. The detection process is simple, fast, and low-cost, and online detection of salt spray concentration can be achieved.

[0016] Optionally, in step two, the high-voltage electrical signal is applied by gradually increasing the output voltage to obtain the breakdown voltage parameter when air breakdown occurs.

[0017] By adopting the above technical solution, the breakdown voltage can be detected by utilizing the law of change of salt spray concentration, and the breakdown voltage parameter can be obtained. Then, the salt spray concentration data can be inferred from the parameter. It has the advantages of simple method implementation and intuitive criteria.

[0018] Optionally, in step two, the high-voltage electrical signal is applied in a constant voltage manner, and the corresponding breakdown current characteristic parameters are obtained by monitoring the current pulse characteristics generated during the air discharge process.

[0019] By adopting the above technical solution, current characteristic parameters related to salt spray concentration can be obtained without frequent voltage adjustment, and salt spray concentration data can also be derived from them.

[0020] Optionally, in step two, under constant voltage conditions, the spacing between electrodes in the electrode assembly is adjusted, and the electrode spacing at the moment when the air first discharges or breaks down is recorded as the critical breakdown gap parameter.

[0021] By adopting the above technical solution, the change in the distance between electrodes is used to reflect the change in salt spray concentration in the air, which is different from the above method of using breakdown voltage parameters and current characteristic parameters. This enriches the detection methods and can improve the reliability of the detection results.

[0022] In summary, this application includes at least one of the following beneficial technical effects: This invention eliminates the need for complex pretreatment steps during detection. By applying a high-voltage electric field between relatively positioned electrodes, air discharge or breakdown phenomena can be triggered. Relevant breakdown characteristic parameters can be collected and processed in a very short time. The overall detection response speed is fast, and the single detection time can be controlled within 1 second, which can reflect the changes in salt spray concentration in the air in a timely manner.

[0023] This invention detects salt spray concentration based on changes in air discharge characteristics. It does not require air sampling, chemical reagents, or laboratory analysis. Detection data can be continuously acquired during equipment operation, enabling real-time online detection of salt spray concentration. The detection process is simplified and the operation is more direct.

[0024] The overall structure of this invention is simple, mainly consisting of a high-voltage power supply module, electrode assembly, and detection and data processing unit. Each component is implemented using conventional electrical components, eliminating the need for optical detection devices or chromatographic analysis equipment, thus reducing overall manufacturing and maintenance costs. Attached Figure Description

[0025] Figure 1 This is a system flowchart of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. High-voltage power supply module; 2. Electrode assembly; 3. Detection module; 4. Data processing unit. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] This application discloses a salt spray concentration detection device based on the high-pressure air breakdown characteristics, including a high-voltage power supply module 1, an electrode assembly 2, a detection module 3, and a data processing unit 4.

[0029] The electrode assembly 2 includes at least one pair of oppositely arranged electrodes with an adjustable spacing, forming a gap between the electrodes for air discharge. The specific structural form of the electrode assembly 2 can be a needle-plate electrode structure, a ball-plate electrode structure, a plate-plate electrode structure, or a coaxial electrode structure. More specifically, the electrode assembly 2 includes a fixed electrode and a movable electrode. The fixed electrode is mounted on an insulating support, and the movable electrode is mounted on an insulating bracket via a threaded adjustment mechanism or a lead screw mechanism. Fine axial displacement adjustment of the electrode can be achieved by rotating an adjustment knob or by motor drive.

[0030] The high-voltage power supply module 1 is used to output an adjustable high-voltage electrical signal. The high-voltage electrical signal output by the high-voltage power supply module 1 can be set to DC high voltage, AC high voltage, pulse high voltage or radio frequency high voltage according to actual needs.

[0031] The detection module 3 is used to detect the electrical signal generated when air discharges or breaks down between the electrodes under the action of a high-voltage electrical signal, and to collect breakdown characteristic parameters related to the discharge or breakdown. Specifically, the detection module 3 includes at least one of a voltage acquisition unit, a current acquisition unit, and a gap measurement unit. The voltage acquisition unit is used to acquire the voltage change across the electrode assembly 2 to obtain the breakdown voltage parameter corresponding to the air discharge or breakdown. The current acquisition unit is used to detect the current signal generated in the electrode circuit during the air discharge or breakdown process to obtain the amplitude change or current characteristic parameter of the discharge current. The gap measurement unit is used to measure the distance between the relatively arranged electrodes in the electrode assembly 2 to obtain the critical breakdown gap parameter corresponding to the first air discharge or breakdown.

[0032] The data processing unit 4, electrically connected to the detection module 3, is used to process the collected breakdown characteristic parameters based on a pre-established correspondence model between the breakdown characteristic parameters and the salt spray concentration to obtain the detection result of the salt spray concentration in the air. The data processing unit 4 includes a signal amplification circuit, an analog-to-digital conversion module, and a microprocessor. The microprocessor is used to process the collected breakdown characteristic parameters and obtain the salt spray concentration detection result according to the pre-established correspondence model.

[0033] A salt spray concentration detection method based on high-pressure air breakdown characteristics, applied to the aforementioned salt spray concentration detection device, includes the following steps: Step 1: Apply a high-voltage electric field capable of inducing air surface discharge or gap breakdown between the relatively arranged electrode components 2 through the high-voltage power supply module 1. Step 2: Under the action of a high-voltage electric field, the detection module 3 detects the electrical signal generated when the air between the electrode components 2 discharges or breaks down, and collects the corresponding breakdown characteristic parameters. The breakdown characteristic parameters include at least one of breakdown voltage, breakdown current characteristics, discharge initiation delay time, critical breakdown gap, and discharge energy. Step 3: Input the breakdown characteristic parameters collected by the detection module 3 into the data processing unit 4, and establish the correspondence between the breakdown characteristic parameters and the salt spray concentration in the data processing unit 4 based on the data obtained under standard experimental conditions. Step 4: The data processing unit 4 processes the breakdown characteristic parameters according to the correspondence described in Step 3 to obtain the salt spray concentration in the air in real time.

[0034] Specifically, in step two, the high-voltage electrical signal is applied by gradually increasing the output voltage to obtain the breakdown voltage parameter when air breaks down.

[0035] Specifically, in step two, a high-voltage electrical signal is applied at a constant voltage, and the corresponding breakdown current characteristic parameters are obtained by monitoring the current pulse characteristics generated during the air discharge process.

[0036] Specifically, in step two, under constant voltage conditions, the distance between the electrodes in the electrode assembly 2 is adjusted, and the distance between the electrodes when the air first discharges or breaks down is recorded as the critical breakdown gap parameter.

[0037] The following will provide specific examples of salt spray concentration detection in comparative experiments for different methods of obtaining breakdown characteristic parameters, including the breakdown voltage method, breakdown current method, critical breakdown gap method, and comparative experiments.

[0038] Example 1: Breakdown Voltage Method In this embodiment, the experiment was conducted at a temperature of 20°C and standard atmospheric pressure.

[0039] Electrode assembly 2 adopts a needle-plate structure, with a tungsten needle diameter of 1 mm and a copper plate diameter of 50 mm. The surface is nickel-plated for corrosion prevention. The electrode spacing is adjustable, and the electrode spacing is set to 5 mm. The detection device is placed in environments with different salt spray concentrations (0-50 mg / m³), and the applied DC voltage is gradually increased at a boost rate of 50 V / s. When a sudden drop in voltage is detected, it is judged as a breakdown. The critical breakdown voltage is recorded, and the test is repeated.

[0040] From the perspective of gas discharge theory, under standard atmospheric pressure, the air breakdown process can be described by the Townsend discharge mechanism combined with the basic idea of ​​Paschen's law. For a non-uniform electric field structure like a needle-plate, the breakdown process is mainly dominated by the local strong electric field near the needle tip. The breakdown voltage can be approximately expressed as a function of the critical breakdown field strength at the needle tip and the effective discharge gap. When the electrode spacing remains constant, the breakdown voltage is mainly affected by factors such as the initial number of electrons in the air gap, the ionization probability, and the effective ionization path length.

[0041] In a salt spray environment, charged ions such as Na⁺ and Cl⁻, as well as polarized droplets carried in the salt spray aerosol, significantly increase the initial carrier density in the air gap and enhance the local electric field distortion effect. This reduces the critical breakdown field strength required for gas discharge, causing the breakdown voltage to decrease with increasing salt spray concentration. Therefore, with the electrode spacing and environmental conditions remaining constant, the breakdown voltage exhibits a monotonically decreasing relationship with salt spray concentration.

[0042] Based on the above theoretical derivation of gas discharge, a mapping relationship between breakdown voltage and salt spray concentration can be established under laboratory conditions. This mapping relationship can be obtained through experimental calibration, numerical simulation, or theoretical estimation; an example correspondence is shown in Table 1.

[0043] Table 1. Example Correspondence between Breakdown Voltage and Salt Spray Concentration Salt spray concentration (mg / m³) Example breakdown voltage (kV) 0 7.80 10 7.40 20 7.00 30 6.60 40 6.20 50 5.90 Furthermore, the data in Table 1 can be fitted to establish the breakdown voltage. The functional relationship between the salt spray concentration C and the concentration C can be expressed as an example analytical expression. .

[0044] The mapping relationship obtained by the breakdown voltage method can be approximately expressed as a linear function: ,in and These are fitting parameters related to electrode structure and environmental conditions. In practical applications, both fitting parameters need to be calibrated through standard experiments. By establishing the above mapping relationship in advance, the corresponding salt spray concentration can be deduced from the measured breakdown voltage during actual testing.

[0045] The table data and mapping relationships above are only used to illustrate the method of establishing mapping relationships in this embodiment, and do not constitute a limitation on the specific numerical range.

[0046] This embodiment has the advantages of high detection accuracy, good repeatability, and simple experimental steps.

[0047] Example 2: Breakdown Current Method In this embodiment, under the conditions of 20°C and standard atmospheric pressure, the needle-plate electrode spacing is 5mm, a constant voltage of 6kV is applied, and the discharge current is monitored and the current pulse characteristics are recorded in different salt spray concentration environments (0-50mg / m³).

[0048] In a needle-plate non-uniform electric field structure, whether discharge occurs between the electrodes depends on the relationship between the applied voltage and the gas breakdown threshold. When the applied voltage is lower than the breakdown voltage under the corresponding conditions, corona discharge or streamer discharge only occurs in the local strong electric field region at the needle tip, manifesting as discrete current pulses. As the salt spray concentration increases, the initial carrier density in the air gap increases, and the local electric field distortion effect is enhanced, making it easier to meet the discharge initiation conditions. This leads to an increase in the frequency and intensity of the discharge pulses with increasing salt spray concentration, ultimately achieving continuous discharge.

[0049] To facilitate quantitative characterization of the aforementioned changes in discharge behavior, this embodiment introduces an equivalent discharge energy parameter. The equivalent discharge energy is obtained by integrating the discharge current signal over time, and is used to comprehensively reflect the frequency and intensity of discharge events within a fixed observation time window. ,in, For the application of a constant voltage, This represents the instantaneous value of the discharge current as a function of time. The preset discharge observation time window length can be selected as 1 second in this embodiment. Since the observation time window remains constant, the equivalent discharge energy... It can be used as a single-valued parameter to characterize changes in salt spray concentration.

[0050] Based on the above theoretical analysis, under the conditions of an applied voltage of 6kV and an electrode spacing of 5mm, an exemplary correspondence between the equivalent discharge energy and the salt spray concentration can be obtained, as shown in Table 2.

[0051] Table 2. Example Correspondence between Equivalent Discharge Energy and Salt Spray Concentration Salt spray concentration (mg / m³) Equivalent discharge energy (μJ) 0 0.1 (close to 0) 10 1.0 20 5.0 30 15.0 40 25.0 50 40.0 Based on the example data in Table 2, the equivalent discharge energy The mapping relationship between the salt spray concentration C and the data can be obtained through table lookup or function fitting. For example, using the least squares method to perform a quadratic polynomial fitting on the data yields the analytical expression: The coefficients of this fitting equation can be calibrated based on the specific electrode structure, environmental conditions, and measurement system.

[0052] Under constant applied voltage and electrode gap, the equivalent discharge energy exhibits a significant monotonic increasing trend with increasing salt spray concentration, and displays obvious nonlinear transition characteristics near the breakdown threshold. By establishing a mapping relationship between the equivalent discharge energy and salt spray concentration, indirect measurement and real-time monitoring of salt spray concentration can be achieved.

[0053] The table data and mapping relationships above are only used to illustrate the method of establishing mapping relationships in this embodiment, and do not constitute a limitation on the specific numerical range.

[0054] Example 3: Critical Gap Method In this embodiment, under the conditions of 20°C and standard atmospheric pressure, a constant voltage of 6kV is applied, and the initial needle-plate electrode spacing is set to 5mm. The electrode gap is gradually reduced in a preset step size until a discharge pulse or current surge is detected between the electrodes. The critical gap at which the first breakdown occurs is recorded. The above operation is repeated in different salt spray concentration environments (0-50mg / m³).

[0055] Under constant applied voltage, the breakdown of the needle-plate electrode is mainly controlled by the local strong electric field near the needle tip. At this time, the critical value for the electrode gap to reach the breakdown condition depends on the equivalent breakdown field strength of the gas. Charged ions and polarized droplets introduced into the salt spray environment will reduce the equivalent breakdown field strength of the gas in the strong electric field region near the needle tip. Therefore, under the same applied voltage, as the salt spray concentration increases, the critical electrode gap corresponding to the breakdown gradually increases, thus forming a monotonically increasing relationship between the critical gap and the salt spray concentration. The exemplary correspondence is shown in Table 3.

[0056] Table 3. Examples of Correspondence between Critical Gap and Salt Spray Concentration Salt spray concentration (mg / m³) Critical gap (mm) 0 3.60 10 3.90 20 4.20 30 4.50 40 4.80 50 5.10 By fitting the example data in Table 3, a mapping relationship between the critical breakdown gap and the salt spray concentration can be established, and the example analytical expression can be obtained as follows: .

[0057] The mapping relationship obtained by the critical gap method can be approximately represented as a linear function: ,in, The critical breakdown gap, Salt spray concentration, The critical breakdown gap under clean air conditions. These are calibration coefficients related to electrode structure, applied voltage, and environmental conditions. By pre-calibrating the above mapping relationship, the corresponding salt spray concentration can be deduced from the measured critical breakdown gap under constant applied voltage conditions during actual testing, thus achieving quantitative detection of salt spray concentration.

[0058] The table data and mapping relationships above are only used to illustrate the method of establishing mapping relationships in this embodiment, and do not constitute a limitation on the specific numerical range.

[0059] Comparative experiment: Compared with the traditional gravimetric method, the gravimetric method requires 1-2 hours of sampling, and the change in filter membrane mass is measured after sampling; the detection deviation of this method is calculated based on the standard salt spray concentration value obtained by the traditional gravimetric method.

[0060] By comparing the above embodiments with comparative experiments, the advantages of this method are: 1. Fast response speed, detection time is less than 1 second; 2. Highly real-time, requiring no sampling or chemical analysis, enabling online concentration detection; 3. High detection sensitivity; within the range of 0-50 mg / m³, the breakdown voltage exhibits an approximately linear relationship with the concentration. 4. The structure is simple and the cost is low. The device consists of a conventional high-voltage power supply and sensing electrodes, and no optical or chromatographic instruments are required.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A salt spray concentration detection device based on the high-pressure air breakdown characteristics, characterized in that, include: Electrode assembly (2), the electrode assembly (2) includes at least a pair of oppositely arranged electrodes with adjustable spacing, the electrodes forming a gap for air discharge; High voltage power supply module (1) is used to output an adjustable high voltage signal; The detection module (3) is used to detect the electrical signal generated when air discharges or breaks down between electrodes under the action of a high voltage signal, and to collect breakdown characteristic parameters related to the discharge or breakdown. The data processing unit (4) is electrically connected to the detection module (3) and is used to process the collected breakdown characteristic parameters based on the pre-established correspondence model between the breakdown characteristic parameters and the salt spray concentration to obtain the detection result of the salt spray concentration in the air.

2. The salt spray concentration detection device based on high-pressure air breakdown characteristics according to claim 1, characterized in that, The electrode assembly (2) is a needle-plate electrode structure, a ball-plate electrode structure, a plate-plate electrode structure, or a coaxial electrode structure.

3. The salt spray concentration detection device based on high-pressure air breakdown characteristics according to claim 1, characterized in that, The high-voltage power supply module (1) outputs a high-voltage electrical signal, which is a DC high voltage, an AC high voltage, a pulse high voltage, or a radio frequency high voltage.

4. The salt spray concentration detection device based on high-pressure air breakdown characteristics according to claim 1, characterized in that, The detection module (3) includes at least one of a voltage acquisition unit, a current acquisition unit, and a gap measurement unit.

5. The salt spray concentration detection device based on high-pressure air breakdown characteristics according to claim 1, characterized in that, The data processing unit (4) includes a signal amplification circuit, an analog-to-digital conversion module, and a microprocessor. The microprocessor is used to process the collected breakdown characteristic parameters and obtain the salt spray concentration detection results according to the pre-established corresponding model.

6. A method for detecting salt spray concentration based on the breakdown characteristics of high-pressure air, applied to the salt spray concentration detection device according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Apply a high-voltage electric field that can induce air surface discharge or gap breakdown between the relatively arranged electrode components (2) through the high-voltage power supply module (1); Step 2: The detection module (3) detects the electrical signal generated when the air between the electrode components (2) is discharged or broken down under the action of the high voltage electric field, and collects the corresponding breakdown characteristic parameters. The breakdown characteristic parameters include at least one of breakdown voltage, breakdown current characteristics, discharge initiation delay time, critical breakdown gap, and discharge energy. Step 3: Input the breakdown characteristic parameters collected by the detection module (3) into the data processing unit (4), and establish the correspondence between the breakdown characteristic parameters and the salt spray concentration in the data processing unit (4) based on the data obtained under standard experimental conditions. Step 4: The data processing unit (4) processes the breakdown characteristic parameters according to the correspondence described in Step 3 to obtain the salt spray concentration in the air in real time.

7. The salt spray concentration detection method based on high-pressure air breakdown characteristics according to claim 6, characterized in that, In step two, the high-voltage electrical signal is applied by gradually increasing the output voltage to obtain the breakdown voltage parameter when air breaks down.

8. The salt spray concentration detection method based on high-pressure air breakdown characteristics according to claim 6, characterized in that, In step two, a high-voltage electrical signal is applied at a constant voltage, and the corresponding breakdown current characteristic parameters are obtained by monitoring the current pulse characteristics generated during the air discharge process.

9. The salt spray concentration detection method based on high-pressure air breakdown characteristics according to claim 6, characterized in that, In step two, under constant voltage conditions, the distance between the electrodes in the electrode assembly (2) is adjusted, and the distance between the electrodes when the air first discharges or breaks down is recorded as the critical breakdown gap parameter.

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