Anti-electromagnetic interference system, method and equipment for gas detector

Abstract

The invention relates to the technical field of gas detection, in particular to an anti-electromagnetic interference system, method and equipment for a gas detector, and the system comprises an anti-interference module, a data acquisition module, an enabling starting module, an automatic opening and closing verification module and a function analysis module; the enabling starting module analyzes the stability of the collected data of the gas detector and the environmental data of the environment where the gas detector is located, and responds to a preset stability state to enable the self-opening and closing verification module to work; the self-opening and closing verification module responds to a working instruction of the enabling starting module and selects and executes a self-checking action; the function analysis module is used for analyzing detection data of the gas detector in the self-checking action period to determine whether the anti-interference module has a fault or not; the self-checking action is triggered through double criteria of the stability state and the calorific value, closed-loop verification of the anti-interference module is realized on the premise of ensuring the detection continuity, and the detection interruption risk caused by invalid self-checking is further avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to an anti-electromagnetic interference system, method and equipment for a gas detector. Background Art

[0002] Electrochemical gas detectors use working electrodes to catalyze the redox reaction of the target gas to generate electron transfer, forming a weak current signal through the electrolyte. This current is linearly related to the gas concentration and is converted into a readable voltage by a constant potential circuit. Its detection accuracy is jointly restricted by the electrode activity, electrolyte state, and temperature compensation accuracy. When electromagnetic radiation invades the detection circuit through spatial coupling, high-frequency interference generates an induced electromotive force in the electrode leads, causing baseline drift, and low-frequency magnetic fields cause Faraday electrolysis interference inside the electrochemical sensor, which manifests as abnormal fluctuations or step mutations in the output signal. Especially when the radiation intensity exceeds 10V / m, the sensor signal-to-noise ratio deteriorates by more than 30%, and the temperature rise caused by electromagnetic interference will accelerate the decomposition of the electrolyte and cause permanent damage. Therefore, in the existing technology, corresponding anti-electromagnetic interference measures are often set for gas detectors.

[0003] For example, prior art discloses an electromagnetic interference-resistant thermal conductivity gas sensor chip comprising a substrate, a resistor strip deposited on the substrate, an insulating layer coated on the resistor strip, a sensitive composite material coated on the insulating layer, and leads welded to the resistor strip. The substrate is a porous, in-situ grown aluminum oxide; the resistor strip is a double-wire, spiraling structure; the insulating layer is made of aluminum oxide nano-ceramic ultrafine powder; and the sensitive composite material is a carbon nanotube / graphene / aluminum oxide ternary composite material. This design leverages the high specific surface area and strong thermal stability of the ternary composite material, and the double-wire, spiraling structure of the resistor strip reduces interference from external electromagnetic fields on the chip's current. This results in the sensor chip having excellent heat exchange efficiency and stability, shortening response time and improving detection accuracy.

[0004] However, the existing technology has the following technical problems: the accuracy of the data can only be determined through periodic external detection, and it is impossible to promptly identify whether the anti-electromagnetic interference related functions are faulty, which leads to a decrease in the accuracy of the gas detector's detection data. Summary of the Invention

[0005] To this end, the present invention provides a gas detector anti-electromagnetic interference system, method and equipment to solve the problem in the prior art that the accuracy of data can only be determined through periodic external detection, and whether the anti-electromagnetic interference related functions are faulty cannot be identified in a timely manner, which leads to reduced accuracy of gas detector detection data.

[0006] To achieve the above objectives, in a first aspect, the present invention provides an anti-electromagnetic interference system for a gas detector, wherein the gas detector performs gas detection by an electrochemical method, and the anti-electromagnetic interference system for the gas detector comprises:

[0007] An anti-interference module, used to shield electromagnetic radiation during the working process of the gas detector;

[0008] A data acquisition module is used to obtain the collected data of the gas detector and the environmental data of the environment in which the gas detector is located, as well as the heat generation of the anti-interference module;

[0009] An enabling startup module is connected to the data acquisition module, analyzes the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located, and enables the self-opening and closing verification module to work in response to a preset stability state;

[0010] A self-opening and closing verification module is connected to the enabling and starting module, and selects and executes a self-checking action in response to a working instruction of the enabling and starting module;

[0011] The self-check action includes: a three-level self-check action, turning off the anti-interference module and continuing for a second preset time period,

[0012] The second level self-check action reduces the operating power of the anti-interference module and lasts for a first preset time.

[0013] The first level self-check action reduces the operating power of the anti-interference module and lasts for a second preset time.

[0014] a function analysis module connected to the data acquisition module and the self-opening and closing verification module, and analyzing the detection data of the gas detector during the self-test action to determine whether the anti-interference module has a fault;

[0015] Among them, the preset stability state satisfies that the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located reaches a preset stability level, and the heat generation of the anti-interference module is continuously greater than the preset heat generation, and the first preset time length is greater than the second preset time length.

[0016] As a preferred technical solution for the gas detector anti-electromagnetic interference system, the enabling module analyzes and quantifies the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located in the following manner:

[0017] Performing sliding window variance calculation on the collected data, and determining that the collected data is stable when the variance values ​​of a preset number of windows are all less than a preset variance threshold;

[0018] A multi-parameter covariance matrix is ​​established for the environmental data, and the environmental data is determined to be stable when the maximum eigenvalue of the matrix is ​​less than the characteristic threshold;

[0019] When it is determined that both the collected data and the environmental data are stable, the enabling module determines that the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located reaches the preset stability level.

[0020] As a preferred technical solution for the gas detector's anti-electromagnetic interference system, the heat generation of the anti-interference module is collected by setting temperature sensors on the surface of the magnetic core element and the filter capacitor. The data acquisition module quantifies the heat generation of the anti-interference module as an average temperature rise.

[0021] The average temperature rise is the difference between the average value of the temperature sensor detection value and the ambient temperature. If the heat output is continuously greater than the preset heat output, the average temperature rise is greater than the preset temperature rise.

[0022] As the preferred technical solution for the gas detector's anti-electromagnetic interference system, the self-opening and closing verification module selects the self-test action according to the following rules:

[0023] If the average temperature rise is less than 50% of the preset temperature rise, the three-level self-test action is selected;

[0024] If the average temperature rise is greater than or equal to 50% of the preset temperature rise and the variance values ​​of a preset number of windows are all less than the preset variance threshold of 50%, the secondary self-test action is selected;

[0025] If the average temperature rise is greater than or equal to 50% of the preset temperature rise and the variance values ​​of a preset number of windows are greater than or equal to 50% of the preset variance threshold, the first level self-test action is selected.

[0026] As the preferred technical solution for the gas detector's anti-electromagnetic interference system, the function analysis module determines faults using the following rules:

[0027] During the duration of the self-test action, if the fluctuation amplitude of the gas detection data exceeds the preset fluctuation threshold, it is determined that the anti-interference module is faulty; the preset fluctuation threshold corresponding to the third-level self-test action is the first-level fluctuation threshold, the second-level self-test action corresponds to the second-level fluctuation threshold, the first-level self-test action corresponds to the third-level fluctuation threshold, and the first-level fluctuation threshold is less than the second-level fluctuation threshold and less than the third-level fluctuation threshold.

[0028] As a preferred technical solution for the gas detector anti-electromagnetic interference system, the function analysis module is configured to perform the following hierarchical diagnostic process:

[0029] When the data fluctuation amplitude exceeds the corresponding action fluctuation threshold but is less than 150% of it, it is marked as a level 1 fault;

[0030] When the data fluctuation amplitude reaches 150%-300% of the corresponding action fluctuation threshold, it is marked as a secondary fault;

[0031] When the data fluctuation amplitude continuously exceeds 300% of the corresponding action fluctuation threshold, it is marked as a level 3 fault.

[0032] As a preferred technical solution for the gas detector anti-electromagnetic interference system, the function analysis module is also configured to execute the following closed-loop feedback strategy:

[0033] The operating parameters of the anti-interference module are automatically corrected according to the fault level. In case of a level 1 fault, only a prompt is given. In case of a level 2 fault, the environmental parameter compensation algorithm is activated. In case of a level 3 fault, a hardware replacement alarm is triggered and the fault spectrum characteristics are stored in the database.

[0034] In a second aspect, the present invention provides a gas detector anti-electromagnetic interference method, which is applied to the gas detector anti-electromagnetic interference system described in any of the above schemes, and the gas detector anti-electromagnetic interference method includes:

[0035] Suppress electromagnetic interference in the working environment through anti-interference modules;

[0036] Obtain real-time detection data of the gas detector, environmental parameters and the heat generation of the anti-interference module;

[0037] Determine whether to perform self-test based on the real-time detection data of the gas detector, environmental parameters and the heat generated by the anti-interference module;

[0038] Select the self-check action and execute it;

[0039] During the self-test action, the detection data of the gas detector is analyzed to determine whether the anti-interference module has a fault.

[0040] In a third aspect, the present invention provides an anti-electromagnetic interference device for a gas detector, which is included in the anti-interference module. The anti-electromagnetic interference device includes a plurality of electromagnetic interference filters and a filtering circuit arranged at the electrode end of the gas detector.

[0041] As a preferred technical solution for the anti-electromagnetic interference device of the gas detector, the electrode end of the gas detector and the anti-electromagnetic interference device are jointly arranged in a protective shell made of electromagnetic shielding material.

[0042] Compared with the existing technology, the beneficial effect of the present invention is that the self-test action is triggered by the dual criteria of stability state and heat generation, and the closed-loop verification of the anti-interference module is realized under the premise of ensuring detection continuity. The data stability and environmental covariance characteristics ensure the controllability of interference variables during self-test, and the temperature rise index directly reflects the physical relationship between electromagnetic shielding power consumption and efficiency, avoiding the risk of detection interruption caused by invalid self-test.

[0043] Furthermore, the present invention captures the short-term fluctuation characteristics of the detection data through sliding window variance calculation, and the stability criterion of the continuously preset window eliminates the influence of occasional interference; the maximum eigenvalue of the multi-parameter covariance matrix quantifies the coupling intensity between environmental parameters. When the eigenvalue is lower than the threshold, it indicates that the environmental factors are in steady-state equilibrium. The two together constitute the reliability basis of enabling triggering.

[0044] Furthermore, the surface temperature of the magnetic core elements and filter capacitors of the present invention directly reflects the heat loss of the core anti-electromagnetic interference components. The physical definition of the average temperature rise converts the electromagnetic shielding effectiveness into a quantifiable thermodynamic indicator. The linear relationship between the preset temperature rise threshold and the electromagnetic shielding power is established through device calibration experiments.

[0045] Furthermore, the present invention associates the self-test action intensity with 50% of the preset temperature rise as the dividing point: when ΔT is less than 50%, the anti-interference module is completely shut down (third-level action), and the fault exposure sensitivity is maximized by using the low electromagnetic radiation environment; when ΔT is greater than or equal to 50%, the power reduction amplitude is selected according to the variance level, and when the window variance is less than the 50% threshold, a long-term second-level action is performed to capture slowly varying faults, and when the variance is greater than or equal to 50%, a short-term first-level action is used to avoid the risk of insufficient stability.

[0046] Furthermore, the present invention differentiates the fluctuation threshold to match the interference exposure level of the self-detection action: the strictest first-level threshold is used when the third-level action completely removes the shielding, and its sensitivity is the highest; the loosest third-level threshold is used when the first-level action retains partial shielding, and its noise resistance is the strongest, forming a negative correlation control mechanism between detection sensitivity and anti-interference capability.

[0047] Furthermore, the present invention establishes a fault severity model based on hierarchical diagnosis of the fluctuation amplitude ratio: within the 150% threshold, it is recoverable interference, the 150%-300% range indicates hardware attenuation such as core aging, and continuously exceeding 300% indicates permanent damage, mostly circuit breakdown. The ratio boundary is calibrated through fault injection experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a structural block diagram of the anti-electromagnetic interference system of a gas detector according to an embodiment of the present invention;

[0049] Figure 2 This is a flow chart of a method for resisting electromagnetic interference of a gas detector according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0051] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0052] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0053] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] See also Figure 1 As shown in the figure, they are respectively structural block diagrams of the anti-electromagnetic interference system of the gas detector in the embodiment of the present invention, and the anti-electromagnetic interference system of the gas detector includes:

[0055] An anti-interference module, used to shield electromagnetic radiation during the working process of the gas detector;

[0056] A data acquisition module is used to obtain the collected data of the gas detector and the environmental data of the environment in which the gas detector is located, as well as the heat generation of the anti-interference module;

[0057] An enabling startup module is connected to the data acquisition module, analyzes the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located, and enables the self-opening and closing verification module to work in response to a preset stability state;

[0058] A self-opening and closing verification module is connected to the enabling and starting module, and selects and executes a self-checking action in response to a working instruction of the enabling and starting module;

[0059] The self-check action includes: a three-level self-check action, turning off the anti-interference module and continuing for a second preset time period,

[0060] The second level self-check action reduces the operating power of the anti-interference module and lasts for a first preset time.

[0061] The first level self-check action reduces the operating power of the anti-interference module and lasts for a second preset time.

[0062] a function analysis module connected to the data acquisition module and the self-opening and closing verification module, and analyzing the detection data of the gas detector during the self-test action to determine whether the anti-interference module has a fault;

[0063] Among them, the preset stability state satisfies that the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located reaches a preset stability level, and the heat generation of the anti-interference module is continuously greater than the preset heat generation, and the first preset time length is greater than the second preset time length.

[0064] In the above embodiment, the self-test action is triggered by the dual criteria of stability state and heat generation, achieving closed-loop verification of the anti-interference module while ensuring detection continuity. The data stability and environmental covariance characteristics ensure the controllability of the interference variable during the self-test, while the temperature rise index directly reflects the physical relationship between electromagnetic shielding power consumption and efficiency, avoiding the risk of detection interruption caused by invalid self-test. In detail, in this embodiment, the first preset time and the second preset time are determined by the response characteristics of the electrochemical sensor and the electromagnetic interference decay time constant. The first preset time must cover the full-scale response time of the sensor (including the 90% concentration step stabilization time), and the second preset time matches the thermal relaxation period of the anti-electromagnetic interference circuit (the time required to re-reach thermal equilibrium after power change). For example, for a typical electrochemical CO sensor (T90 = 30s) and a ferrite core filter (τ = 8s), the first preset time is 60±5s (twice the response period), and the second preset time is 30±3s (3.75 times the thermal relaxation period).

[0065] Specifically, the enabling module analyzes and quantifies the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located in the following manner:

[0066] Performing sliding window variance calculation on the collected data, and determining that the collected data is stable when the variance values ​​of a preset number of windows are all less than a preset variance threshold;

[0067] A multi-parameter covariance matrix is ​​established for the environmental data, and the environmental data is determined to be stable when the maximum eigenvalue of the matrix is ​​less than the characteristic threshold;

[0068] When both the collected data and the environmental data are determined to be stable, the enabling module determines whether the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located has reached the preset stability level. In the above embodiment, the short-term fluctuation characteristics of the detection data are captured by sliding window variance calculation, and the stability criterion of the continuous preset window eliminates the influence of occasional interference. The maximum eigenvalue of the multi-parameter covariance matrix quantifies the coupling strength between the environmental parameters. When the eigenvalue is lower than the threshold, it indicates that the environmental factors are in steady-state equilibrium. Together, the two constitute the reliability basis of the enabling trigger. In detail, in this embodiment, the preset variance threshold is determined by the statistical characteristics of the electrochemical sensor background noise. The sliding window of collected data under stable operating conditions for 30 consecutive days is taken, with a window length of 60 seconds. The upper limit of the 99% confidence interval of the variance value is taken. The characteristic threshold is set as the mean of the absolute value of the non-diagonal elements of the covariance matrix based on the physical coupling relationship between the environmental parameters. For example, for a CO sensor with a range of 0-100 ppm, the preset variance threshold is 0.03% FS, and the characteristic threshold of the multi-parameter environmental covariance matrix is ​​0.8.

[0069] Specifically, the heat generation of the anti-interference module is collected by setting temperature sensors on the surface of the magnetic core element and the filter capacitor, and the data acquisition module quantifies the heat generation of the anti-interference module as an average temperature rise;

[0070] The average temperature rise is the difference between the average value detected by the temperature sensor and the ambient temperature. The fact that the heat output is consistently greater than the preset heat output satisfies the requirement that the average temperature rise is greater than the preset temperature rise. In the above embodiment, the surface temperatures of the magnetic core element and the filter capacitor directly reflect the heat loss of the core anti-electromagnetic interference component. The physical definition of the average temperature rise converts the electromagnetic shielding effectiveness into a quantifiable thermodynamic indicator. The linear relationship between the preset temperature rise threshold and the electromagnetic shielding power is established through device calibration experiments.

[0071] Specifically, the self-opening and closing verification module selects the self-checking action according to the following rules:

[0072] If the average temperature rise is less than 50% of the preset temperature rise, the three-level self-test action is selected;

[0073] If the average temperature rise is greater than or equal to 50% of the preset temperature rise and the variance values ​​of a preset number of windows are all less than the preset variance threshold of 50%, the secondary self-test action is selected;

[0074] If the average temperature rise is greater than or equal to 50% of the preset temperature rise and the variance values ​​of the consecutive preset number of windows are greater than or equal to 50% of the preset variance threshold, the first-level self-test action is selected. In the above embodiment, the 50% preset temperature rise is used as the dividing point to associate the self-test action intensity: when ΔT < 50%, the anti-interference module is completely shut down (third-level action), and the fault exposure sensitivity is maximized by using the low electromagnetic radiation environment; when ΔT ≥ 50%, the power reduction amplitude is selected according to the variance level, wherein when the window variance is less than 50% threshold, a long-term second-level action is performed to capture slow-changing faults, and when the variance is ≥ 50%, a short-term first-level action is used to avoid the risk of insufficient stability. In detail, in this embodiment, the preset temperature rise is determined based on the electromagnetic shielding effectiveness-temperature rise characteristic curve of the anti-interference module. The curve is calibrated by the thermal balance experiment of the magnetic core component under the standard electromagnetic interference field. The critical temperature rise corresponding to the 3dB drop in shielding effectiveness is taken as the preset threshold, and it must be lower than 60% of the Curie temperature of the material to ensure the stability of the magnetic permeability. For example, the preset temperature rise is set to 15±2K.

[0075] Specifically, the function analysis module determines the fault according to the following rules:

[0076] During the duration of the self-test action, if the fluctuation amplitude of the gas detection data exceeds the preset fluctuation threshold, it is determined that the anti-interference module has a fault; wherein the preset fluctuation threshold corresponding to the three-level self-test action is the first-level fluctuation threshold, the second-level self-test action corresponds to the second-level fluctuation threshold, the first-level self-test action corresponds to the third-level fluctuation threshold, and the first-level fluctuation threshold < the second-level fluctuation threshold < the third-level fluctuation threshold. In the above embodiment, the differentiated fluctuation threshold matches the interference exposure degree of the self-test action: when the third-level action completely removes the shielding, the strictest first-level threshold is used, which has the highest sensitivity; when the first-level action retains partial shielding, the loosest third-level threshold is used, which has the strongest noise resistance, forming a negative correlation control mechanism between detection sensitivity and anti-interference ability. In detail, the fluctuation amplitude is the variance value of the gas concentration data collected during the self-test action, and the corresponding first-level fluctuation threshold, second-level fluctuation threshold and third-level fluctuation threshold are 0.04, 0.09 and 0.36 respectively. In implementation, it can also be converted into other parameters that characterize the stability of the data.

[0077] Specifically, the function analysis module is configured to perform the following hierarchical diagnosis process:

[0078] When the data fluctuation amplitude exceeds the corresponding action fluctuation threshold but is less than 150% of it, it is marked as a level 1 fault;

[0079] When the data fluctuation amplitude reaches 150%-300% of the corresponding action fluctuation threshold, it is marked as a secondary fault;

[0080] When the data fluctuation amplitude continuously exceeds 300% of the corresponding action fluctuation threshold, it is marked as a level 3 fault.

[0081] Specifically, the function analysis module is further configured to execute the following closed-loop feedback strategy:

[0082] The anti-interference module's operating parameters are automatically adjusted based on the fault level. Level 1 faults only provide a prompt, level 2 faults initiate an environmental parameter compensation algorithm, and level 3 faults trigger a hardware replacement alert and store the fault spectrum characteristics in a database. In the above embodiment, a fault severity model is established based on hierarchical diagnosis of fluctuation amplitude ratios: A threshold below 150% indicates recoverable interference, while a range between 150% and 300% indicates hardware degradation, such as core aging. A sustained level exceeding 300% indicates permanent damage, often indicating circuit breakdown. These ratio boundaries are calibrated through fault injection experiments.

[0083] See also Figure 2 As shown, this embodiment provides a gas detector anti-electromagnetic interference method, which is applied to the gas detector anti-electromagnetic interference system described in any of the above solutions. The gas detector anti-electromagnetic interference method includes:

[0084] Step S1, suppressing electromagnetic interference in the working environment through an anti-interference module;

[0085] Step S2, obtaining real-time detection data of the gas detector, environmental parameters and the heat generation of the anti-interference module;

[0086] Step S3, determining whether to perform a self-test action based on the real-time detection data of the gas detector, environmental parameters and the heat generation of the anti-interference module;

[0087] Step S4, select and execute a self-check action;

[0088] Step S5: Analyze the detection data of the gas detector during the self-test action to determine whether the anti-interference module has a fault.

[0089] This embodiment further provides an anti-electromagnetic interference device for a gas detector, which is included in the anti-interference module. The anti-electromagnetic interference device includes a plurality of electromagnetic interference filters and a filtering circuit arranged at the electrode end of the gas detector.

[0090] As a preferred technical solution for the anti-electromagnetic interference device of the gas detector, the electrode end of the gas detector and the anti-electromagnetic interference device are jointly arranged in a protective shell made of electromagnetic shielding material.

[0091] The flowchart or block diagram in the accompanying drawings illustrates the possible implementation architecture, functions and operations of the device, method and computer program product according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0093] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A gas detector anti-electromagnetic interference system, wherein the gas detector performs gas detection by electrochemical means, characterized in that: The gas detector anti-electromagnetic interference system includes: An anti-interference module, used to shield electromagnetic radiation during the working process of the gas detector; A data acquisition module is used to obtain the collected data of the gas detector and the environmental data of the environment in which the gas detector is located, as well as the heat generation of the anti-interference module; An enabling startup module is connected to the data acquisition module, analyzes the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located, and enables the self-opening and closing verification module to work in response to a preset stability state; A self-opening and closing verification module is connected to the enabling and starting module, and selects and executes a self-checking action in response to a working instruction of the enabling and starting module; The self-check action includes: a three-level self-check action, turning off the anti-interference module and continuing for a second preset time period, The second level self-check action reduces the operating power of the anti-interference module and lasts for a first preset time. The first level self-check action reduces the operating power of the anti-interference module and lasts for a second preset time. a function analysis module connected to the data acquisition module and the self-opening and closing verification module, and analyzing the detection data of the gas detector during the self-test action to determine whether the anti-interference module has a fault; Among them, the preset stability state satisfies that the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located reaches a preset stability level, and the heat generation of the anti-interference module is continuously greater than the preset heat generation, and the first preset time length is greater than the second preset time length.

2. The gas detector anti-electromagnetic interference system according to claim 1, characterized in that: The enabling module analyzes and quantifies the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located in the following manner: Performing sliding window variance calculation on the collected data, and determining that the collected data is stable when the variance values ​​of a preset number of windows are all less than a preset variance threshold; A multi-parameter covariance matrix is ​​established for the environmental data, and the environmental data is determined to be stable when the maximum eigenvalue of the matrix is ​​less than the characteristic threshold; When it is determined that both the collected data and the environmental data are stable, the enabling module determines that the stability of the collected data of the gas detector and the environmental data of the environment in which the gas detector is located reaches the preset stability level.

3. The gas detector anti-electromagnetic interference system according to claim 2, characterized in that: The heat generation of the anti-interference module is collected by arranging temperature sensors on the surface of the magnetic core element and the filter capacitor, and the data acquisition module quantifies the heat generation of the anti-interference module as an average temperature rise; The average temperature rise is the difference between the average value of the temperature sensor detection value and the ambient temperature. If the heat output is continuously greater than the preset heat output, the average temperature rise is greater than the preset temperature rise.

4. The gas detector anti-electromagnetic interference system according to claim 3, characterized in that: The self-opening and closing verification module selects the self-checking action according to the following rules: If the average temperature rise is less than 50% of the preset temperature rise, the three-level self-test action is selected; If the average temperature rise is greater than or equal to 50% of the preset temperature rise and the variance values ​​of a preset number of windows are all less than the preset variance threshold of 50%, the secondary self-test action is selected; If the average temperature rise is greater than or equal to 50% of the preset temperature rise and the variance values ​​of a preset number of windows are greater than or equal to 50% of the preset variance threshold, the first level self-test action is selected.

5. The gas detector anti-electromagnetic interference system according to claim 4, characterized in that: The function analysis module determines the fault according to the following rules: During the duration of the self-test action, if the fluctuation amplitude of the gas detection data exceeds the preset fluctuation threshold, it is determined that the anti-interference module is faulty; the preset fluctuation threshold corresponding to the third-level self-test action is the first-level fluctuation threshold, the second-level self-test action corresponds to the second-level fluctuation threshold, the first-level self-test action corresponds to the third-level fluctuation threshold, and the first-level fluctuation threshold is less than the second-level fluctuation threshold and less than the third-level fluctuation threshold.

6. The gas detector anti-electromagnetic interference system according to claim 5, characterized in that: The functional analysis module is configured to perform the following hierarchical diagnostic process: When the data fluctuation amplitude exceeds the corresponding action fluctuation threshold but is less than 150% of it, it is marked as a level 1 fault; When the data fluctuation amplitude reaches 150%-300% of the corresponding action fluctuation threshold, it is marked as a secondary fault; When the data fluctuation amplitude continuously exceeds 300% of the corresponding action fluctuation threshold, it is marked as a level 3 fault.

7. The gas detector anti-electromagnetic interference system according to claim 6, characterized in that: The functional analysis module is further configured to implement the following closed-loop feedback strategy: The operating parameters of the anti-interference module are automatically corrected according to the fault level. In case of a level 1 fault, only a prompt is given. In case of a level 2 fault, the environmental parameter compensation algorithm is activated. In case of a level 3 fault, a hardware replacement alarm is triggered and the fault spectrum characteristics are stored in the database.

8. A gas detector anti-electromagnetic interference method, applied to the gas detector anti-electromagnetic interference system according to any one of claims 1 to 7, characterized in that: The gas detector anti-electromagnetic interference method comprises: Suppress electromagnetic interference in the working environment through anti-interference modules; Obtain real-time detection data of the gas detector, environmental parameters and the heat generation of the anti-interference module; Determine whether to perform self-test based on the real-time detection data of the gas detector, environmental parameters and the heat generated by the anti-interference module; Select the self-check action and execute it; During the self-test action, the detection data of the gas detector is analyzed to determine whether the anti-interference module has a fault.

9. A gas detector anti-electromagnetic interference device, comprising the anti-interference module according to any one of claims 1 to 7, characterized in that: The anti-electromagnetic interference device includes a plurality of electromagnetic interference filters and a filtering circuit arranged at the electrode end of the gas detector.

10. The gas detector anti-electromagnetic interference device according to claim 9, characterized in that: The electrode end of the gas detector and the anti-electromagnetic interference device are jointly arranged in a protective shell made of electromagnetic shielding material.

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