Device, method and system for monitoring gas concentration of cable well

Abstract

The invention relates to the technical field of gas concentration monitoring, and provides a cable well gas concentration monitoring device, monitoring method and system.The gas concentration in a cable well is detected through a gas detection probe through a data acquisition module, the concentration of harmful gas can be monitored in real time, and the accuracy and reliability of data are ensured; the influence of factors such as environment temperature and humidity on a measurement result is eliminated, the accuracy and generalization ability of measurement are improved, and a historical trend chart and alarm information are generated; the data transmission module transmits the detected gas concentration in the cable well to a ground monitoring terminal, data can be stably transmitted in a complex environment, and the timeliness and integrity of the data are ensured; the data processing module processes the received gas concentration in the cable well and generates a gas signal; the visual display module visually displays gas signals and is provided with interface setting.

Description

Technical Field

[0001] The present application relates to the technical field of gas concentration monitoring, and in particular to a cable well gas concentration monitoring device, a monitoring method and a system. Background Art

[0002] At present, cable well gas concentration monitoring mainly relies on traditional fixed-interval discrete detection equipment. These devices usually perform detection at regular intervals, such as every half an hour. However, this detection method has low accuracy and is easily affected by factors such as ambient temperature and humidity, resulting in inaccurate gas concentration data collected.

[0003] In recent years, with the maturity of Internet of Things technology and edge computing technology, cable well gas concentration monitoring has begun to develop in the direction of intelligence and real-time, which is suitable for data collection in complex environments such as cable wells to ensure the real-time and accuracy of data. However, most of them have not solved how to detect and process the gas concentration in the cable well to realize the alarm function.

[0004] For example, a Chinese patent with publication number CN118671265A discloses a cable well gas concentration compensation method and related equipment based on the IAGA-BP algorithm, which belongs to the field of cable well monitoring. The method outputs the optimal gas concentration correction value by inputting the collected gas concentration to be compensated, the current temperature value and the current humidity value into a pre-built gas concentration compensation model; wherein the gas concentration compensation model is constructed based on the historical gas concentration, the historical temperature value and the historical humidity value in combination with the BP algorithm and the IAGA algorithm; accurate compensation for the gas concentration to be compensated is achieved, and the influence of factors such as ambient temperature, humidity, and cross interference is eliminated through compensation; the combination of the BP algorithm and the IAGA algorithm is used to improve the accuracy of the model and ensure the accuracy of the optimal gas concentration correction value finally output; the method can accurately monitor harmful gases in the cable well and prevent cable well accidents; the method is simple and feasible, has strong versatility and is easy to implement, and has good promotion and application value.

[0005] For example, a Chinese patent with authorization announcement number CN106970564B discloses an online monitoring system and method for a cable trench, including a central processing unit, an optical fiber thermometer, a partial discharge signal processor, a temperature measurement data collector, an RS485 intelligent instrument, a data acquisition unit, an A / D conversion unit, an alarm device, a fan for ventilating the cable trench, a water pump, a partial discharge sensor, a temperature sensing optical fiber, a temperature measurement transmitter, a gas detector, a water level detector and an ambient temperature and humidity detector. The system and method automatically monitor the temperature of the cable in the cable trench, the layout discharge signal and temperature of the cable interface, and the temperature, combustible gas concentration and ambient temperature in the cable trench, and simultaneously realize automatic control of the temperature and water in the cable trench.

[0006] The above patents have the problem raised by the background technology: the above two patents do not solve the problem of how to realize the alarm function by detecting and processing the gas concentration in the cable well. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present application provides a cable well gas concentration monitoring device, a monitoring method and a system.

[0008] In a first aspect, the present application provides a cable well gas concentration monitoring system, the system comprising: a data acquisition module, a data transmission module, a data processing module and a visual display module;

[0009] The data acquisition module is used to detect the gas concentration in the cable well through a gas detection probe;

[0010] The data transmission module is used to transmit the gas concentration detected in the cable well to the ground monitoring terminal;

[0011] The data processing module is used to process the gas concentration received in the cable well and generate a gas signal;

[0012] The visual display module is used to visually display the gas signal and is equipped with an interface setting.

[0013] As an optional implementation, the gas concentration in the cable well is detected by a gas detection probe, and the gas detection probe is automatically calibrated. The automatic calibration logic of the gas detection probe includes:

[0014] Read the current gas concentration from the gas detection probe, monitor the ambient temperature and humidity data in real time, determine the temperature correction factor and humidity correction factor, correct the current gas concentration through the calibration compensation formula, and output the corrected gas concentration to compensate for the impact of changes in ambient temperature and humidity data on the gas detection probe.

[0015] As an optional implementation, the function expression of the calibration compensation formula is as follows:

[0016]

[0017] In the formula, g t Indicates the corrected gas concentration, g r represents the uncorrected current gas concentration, α represents the temperature correction coefficient, t represents the ambient temperature data, t0 represents the standard ambient temperature, β represents the humidity correction coefficient, h represents the ambient humidity data, and h0 represents the standard ambient humidity.

[0018] As an optional implementation, the gas concentration detected in the cable well is transmitted to the ground monitoring terminal through the LoRa technology. The deployment logic of LoRa includes:

[0019] Each gas detection probe acts as a terminal node, responsible for regularly collecting gas concentrations and transmitting gas concentrations to nearby LoRa networks via LoRa wireless signals. The number and location of LoRa networks are determined based on the number and location of terminal nodes, and are adjusted by calculating spatial losses.

[0020] As an optional implementation, the functional expression of the space loss is as follows:

[0021]

[0022] Where l represents the space loss value, d represents the distance from the LoRa network to the terminal node, d0 represents the standard distance, f represents the signal frequency, and k represents a constant.

[0023] As an optional implementation, the logic for generating the gas signal includes:

[0024] The gas concentration in the cable well is pre-processed and the gas concentration threshold is configured. The gas concentration threshold includes the gas concentration base value and the gas concentration extreme value. The gas concentration in the cable well is compared with the gas concentration threshold to determine whether an alarm is required. If the gas concentration in the cable well is less than the gas concentration base value, the alarm is not triggered.

[0025] If the gas concentration in the cable well is greater than or equal to the gas concentration base value and the gas concentration in the cable well is less than or equal to the gas concentration extreme value, a level 1 alarm is triggered;

[0026] If the gas concentration in the cable well is greater than the gas concentration limit, a secondary alarm will be triggered.

[0027] In a second aspect, the present application provides a method for monitoring gas concentration in a cable well, the method comprising: S1, detecting the gas concentration in the cable well by a gas detection probe;

[0028] S2, transmitting the gas concentration detected in the cable well to the ground monitoring terminal;

[0029] S3, processing the gas concentration received in the cable well to generate a gas signal;

[0030] S4, visual display of gas signals, and equipped with interface settings.

[0031] In a second aspect, the present application provides a cable well gas concentration monitoring device, the device comprising: a gas monitoring terminal and a ground monitoring terminal;

[0032] The gas monitoring terminal includes a housing, a gas detection probe and an alarm module. The gas detection probe detects the gas concentration in the cable well and determines whether to trigger an alarm based on the gas concentration.

[0033] The ground monitoring terminal includes a touch screen and a GPRSDTU module, which is used to process the gas concentration received in the cable well, generate a gas signal and display it on the touch screen.

[0034] Compared with the prior art, the beneficial effects of the present application are as follows: the data acquisition module detects the gas concentration in the cable well through the gas detection probe, which can monitor the concentration of harmful gases in real time, ensure the accuracy and reliability of the data, eliminate the influence of environmental temperature and humidity and other factors on the measurement results, improve the accuracy and generalization ability of the measurement, and generate historical trend charts and alarm information; the data transmission module transmits the gas concentration detected in the cable well to the ground monitoring terminal, which can stably transmit data in a complex environment to ensure the timeliness and integrity of the data; the data processing module processes the gas concentration received in the cable well and generates a gas signal; the visual display module visualizes the gas signal and is equipped with an interface setting. Users can view the gas concentration, environmental parameters and alarm conditions in each cable well in real time through the Web terminal or mobile terminal. The interface is friendly and intuitive, and supports custom setting of alarm thresholds and viewing of historical data. Through the interaction between the above modules, the monitoring system realizes the real-time monitoring, data transmission, processing and visual display of the concentration of harmful gases in the cable well. The monitoring system not only improves the accuracy and real-time nature of the monitoring data, but also greatly reduces the workload and cost of manual monitoring, and ensures the life safety of construction personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0036] Figure 1 A system structure diagram of a cable well gas concentration monitoring system provided in an embodiment of the present application;

[0037] Figure 2 An automatic calibration logic diagram of a cable well gas concentration monitoring system provided in an embodiment of the present application;

[0038] Figure 3 A method flow chart of a cable well gas concentration monitoring method provided in an embodiment of the present application;

[0039] Figure 4 This is a device structure diagram of the cable well gas concentration monitoring device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the drawings in the specification. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0041] Example 1

[0042] like Figure 1 As shown, a system structure diagram of a cable well gas concentration monitoring system is provided for an embodiment of the present application. The system includes a data acquisition module, a data transmission module, a data processing module and a visual display module.

[0043] The data acquisition module is used to detect the gas concentration in the cable well through a gas detection probe.

[0044] The gas concentration in the cable well is detected by the gas detection probe, and the gas detection probe is automatically calibrated. The automatic calibration logic of the gas detection probe is as follows: Figure 2 As shown, specifically including:

[0045] Read the current gas concentration from the gas detection probe, monitor the ambient temperature and humidity data in real time, determine the temperature correction factor and humidity correction factor, correct the current gas concentration through the calibration compensation formula, and output the corrected gas concentration to compensate for the impact of changes in ambient temperature and humidity data on the gas detection probe.

[0046] The functional expression of the calibration compensation formula is as follows:

[0047]

[0048] In the formula, g t Indicates the corrected gas concentration, g r represents the uncorrected current gas concentration, α represents the temperature correction coefficient, t represents the ambient temperature data, t0 represents the standard ambient temperature, β represents the humidity correction coefficient, h represents the ambient humidity data, and h0 represents the standard ambient humidity.

[0049] It should be noted that the corrected gas concentration g t It is the actual gas concentration obtained after temperature and humidity compensation, eliminating the influence of changes in ambient temperature and humidity on the measurement results of the gas detection probe; the uncorrected current gas concentration g rIt refers to the gas concentration value directly measured by the gas detection probe, the original value without temperature and humidity correction; the temperature correction coefficient α refers to the influence of ambient temperature on the gas concentration measurement, which indicates the correction coefficient of temperature change on the measurement result. The specific value depends on the type of gas and the characteristics of the gas detection probe (usually within 10 -5 Up to 10 -1 ), usually a small positive number, because the increase in temperature usually leads to an increase in the measured value of gas concentration; the ambient temperature data t refers to the temperature of the location of the gas detection probe in the actual environment; the standard ambient temperature t0 usually refers to the temperature when the gas detection probe is calibrated, or the temperature when the gas concentration is measured under ideal conditions; the humidity correction factor β refers to the influence of ambient humidity on the gas concentration measurement, which indicates the correction factor of the measurement result due to the change of ambient humidity. The specific value depends on the type of gas and the characteristics of the gas detection probe (usually between 10 -4 Up to 10 -2 The ambient humidity data h refers to the relative humidity at the location of the gas detection probe in the actual environment; the standard ambient humidity h0 is usually the humidity when the gas detection probe is calibrated, or the humidity under ideal measurement conditions.

[0050] Exemplarily, the derivation of the above calibration compensation formula is based on the assumption that the influence of ambient temperature and humidity on the measurement results of the gas detection probe is linear and can be compensated by a correction coefficient. The core idea is to adjust the measured value of the gas concentration to a standard condition by compensating for changes in temperature and humidity.

[0051] For example, the responses of most gas detection probes to ambient temperature and humidity are not completely independent, but their effects can be approximately described by a simple linear model; for the temperature correction coefficient, the motion of gas molecules and the sensing elements of the gas detection probe are usually more sensitive to temperature changes, and an increase in temperature often leads to an increase in the response of the gas sensor; and for the humidity correction coefficient, humidity usually has little effect on gas concentration measurement, but some gas detection probes (such as sensors based on electrochemical or infrared principles) will also respond to changes in humidity; the temperature correction coefficient and the humidity correction coefficient are generally obtained through experiments, and can be determined by changing the temperature and humidity conditions in a gas environment with a known gas concentration and recording the output of the gas detection probe; the above calibration compensation formula provides a simple and effective way to adjust the gas concentration measurement error caused by changes in ambient temperature and humidity.

[0052] The data transmission module is used to transmit the gas concentration detected in the cable well to the ground monitoring terminal.

[0053] The gas concentration detected in the cable well is transmitted to the ground monitoring terminal through LoRa technology. The deployment logic of LoRa includes:

[0054] Each gas detection probe acts as a terminal node, responsible for regularly collecting gas concentrations and transmitting gas concentrations to nearby LoRa networks via LoRa wireless signals. The number and location of LoRa networks are determined based on the number and location of terminal nodes, and are adjusted by calculating spatial losses.

[0055] The functional expression of spatial loss is as follows:

[0056]

[0057] Where l represents the space loss value, d represents the distance from the LoRa network to the terminal node, d0 represents the standard distance, f represents the signal frequency, and k represents a constant.

[0058] It should be noted that: the distance d from the LoRa network to the terminal node is usually the distance set when the monitoring system is designed, which depends on the actual application scenario; the standard distance d0 is used for standardized calculations and is used as a benchmark value to simplify mathematical formulas, usually taking a value of 1; the signal frequency f refers to the number of signal fluctuations per second; the constant k is usually set to 20, which is a constant used in the formula to adjust the unit and numerical scale.

[0059] For example, LoRa wireless communication technology is used to transmit the gas concentration data detected in the cable well to the ground monitoring terminal in real time. LoRa wireless communication technology has the characteristics of low power consumption, long distance and high reliability. It is suitable for data transmission in complex environments to ensure the timeliness and integrity of the data.

[0060] For example, terminal nodes can be set up in locations where gas concentrations are more sensitive or require continuous monitoring, such as industrial facilities, mining areas, and urban environments; the typical communication distance of a LoRa network is between 2 and 15 kilometers, and the specific range is greatly affected by environmental factors (such as terrain, obstacles, weather, etc.). The communication distance in open areas and areas with low building density is longer, while in cities, high-rise buildings or underground environments, the actual transmission distance may be greatly reduced; when deploying a LoRa network, it is necessary to evaluate the environment and select a suitable network location to ensure that the network coverage can include all terminal nodes.

[0061] For example, the number and deployment of LoRa networks should be planned based on network coverage requirements, the number and distribution of terminal nodes. Usually, LoRa networks need to be placed at higher locations (such as on top of buildings or towers) to increase the signal propagation range; each LoRa network can support multiple terminal nodes, so reasonable gateway spacing and coverage area are crucial, and the optimal LoRa network location and density can be determined by the amount of space loss.

[0062] Exemplarily, the spatial loss value is obtained using the above formula, and the maximum communication distance between the LoRa network and the terminal node can be estimated. However, in the actual environment, there may be various attenuation factors (such as environmental loss). According to the maximum communication distance between the LoRa network and the terminal node and the size of the cable well covered by the LoRa network, the number and density of the required LoRa networks (that is, the distribution of the LoRa network) can be estimated. Based on the maximum communication distance between the LoRa network and the terminal node and the area of ​​the cable well size, the location of the LoRa network can be preliminarily estimated. In actual deployment, some high ground, building roofs or other locations suitable for installing equipment are usually selected to ensure coverage of a larger area and minimize signal blockage.

[0063] For example, the LoRa network supports multi-node access, that is, multiple terminal nodes can be connected to the same LoRa network at the same time, which is crucial for application scenarios that require a large number of terminal devices (such as monitoring systems); as the number of terminal nodes increases, the load of the LoRa network will also increase. At this time, it is necessary to optimize network performance through reasonable channel management, spread spectrum factor selection and data transmission strategy to avoid data congestion.

[0064] The data processing module is used to process the gas concentration received in the cable well and generate a gas signal.

[0065] The gas signal generation logic includes:

[0066] The gas concentration in the cable well is pre-processed and the gas concentration threshold is configured. The gas concentration threshold includes the gas concentration base value and the gas concentration extreme value. The gas concentration in the cable well is compared with the gas concentration threshold to determine whether an alarm is required. If the gas concentration in the cable well is less than the gas concentration base value, the alarm is not triggered.

[0067] If the gas concentration in the cable well is greater than or equal to the gas concentration base value and the gas concentration in the cable well is less than or equal to the gas concentration extreme value, a level 1 alarm is triggered;

[0068] If the gas concentration in the cable well is greater than the gas concentration limit, a secondary alarm will be triggered.

[0069] Exemplarily, data preprocessing includes cleaning and filtering the gas concentration data to remove noise or inaccurate measurement values, and a simple moving average filter, Kalman filter, or other method may be used to smooth the data.

[0070] Exemplarily, the detected gases include carbon monoxide, hydrogen sulfide, sulfur hexafluoride and oxygen, and the gas concentration threshold of each gas usually needs to be set according to standard safety regulations, industry standards and hazardous characteristics of the gas; when the detected gas concentration is less than the gas concentration base value, no alarm is triggered; when the detected gas concentration is greater than or equal to the gas concentration base value and the detected gas concentration is less than or equal to the gas concentration extreme value, a first-level alarm is triggered (the yellow LED light flashes); when the detected gas concentration is greater than the gas concentration extreme value, a second-level alarm is triggered (the red LED light is always on, accompanied by a continuous beeping sound).

[0071] Exemplarily, the gas signal includes the gas concentration in the cable well, date, construction content and alarm signal. The gas concentration in the cable well refers to the concentration data of different gases; the date is a time series used to record the changes in gas concentration; the construction content refers to the work content of the construction personnel in the well, such as cable installation, electrical testing and equipment maintenance, etc. The construction content sometimes affects the type or concentration of the gas; the alarm signal is obtained through the above-mentioned logical judgment rules to determine whether an alarm needs to be triggered and the type of alarm.

[0072] The visual display module is used to visualize the gas signal and is equipped with interface settings.

[0073] Exemplarily, the gas concentration in the cable well, the date and time of data collection, the current construction activities (such as cable installation and electrical testing, etc.) and the corresponding alarm signals are displayed in real time.

[0074] For example, the user is allowed to modify parameters such as the gas concentration threshold and the display accuracy of the gas concentration, so as to help the user understand the changes in the gas concentration in the cable well and facilitate subsequent corresponding decisions.

[0075] Example 2

[0076] like Figure 3 As shown, a method flow chart of a cable well gas concentration monitoring method is provided for an embodiment of the present application, and the method includes:

[0077] S1. Detect the gas concentration in the cable well through a gas detection probe;

[0078] S2, transmitting the gas concentration detected in the cable well to the ground monitoring terminal;

[0079] S3, processing the gas concentration received in the cable well to generate a gas signal;

[0080] S4, visual display of gas signals, and equipped with interface settings.

[0081] Since the principle of solving the problem by the method in the embodiment of the present application is similar to that of the system described above in the embodiment of the present application, the implementation of the method refers to the implementation of the system, and the repeated parts will not be repeated.

[0082] Example 3

[0083] like Figure 4 As shown, a device structure diagram of a cable well gas concentration monitoring device is provided for an embodiment of the present application, and the device includes:

[0084] Gas monitoring terminal, ground monitoring terminal and cloud server.

[0085] The gas monitoring terminal includes a shell, a gas detection probe and an alarm module. The gas concentration in the cable well is detected by the gas detection probe, and whether to trigger an alarm is determined based on the gas concentration.

[0086] Exemplarily, the housing is made of high-strength engineering plastics, has good water-repellent, dust-proof and corrosion-resistant properties, and is adaptable to the humid and corrosive environment in the cable well. The housing is compactly designed for easy installation and maintenance.

[0087] Exemplarily, the gas monitoring terminal is equipped with four gas detection probes, which are used to detect carbon monoxide, hydrogen sulfide, sulfur hexafluoride and oxygen respectively. Each gas detection probe adopts a high-precision sensor to ensure the accuracy and stability of the measurement. The gas detection probe has a built-in self-calibration function, which can automatically correct the zero drift and extend the service life.

[0088] For example, the gas detection probe adopts a low-power design, and the power consumption in normal working mode is less than 50mW. When the gas concentration is not detected to be excessive, the gas detection probe automatically enters the low-power mode and collects data once a second. Once the gas concentration is detected to be excessive, it immediately switches to the normal operating mode, collects data once a second and uploads it in real time. This mode switching mechanism effectively extends the battery life and ensures the long-term stable operation of the gas detection probe.

[0089] Exemplarily, the alarm module includes an LED and a buzzer. When it is detected that the concentration of any gas exceeds the gas concentration threshold, the gas monitoring terminal sends out an audible and visual alarm signal through the LED light and the buzzer. The alarm signal is divided into two levels: the first level alarm is a flashing yellow LED light, indicating that the gas concentration is close to the gas concentration base value; the second level alarm is a solid red LED light accompanied by a continuous buzzing sound, indicating that the gas concentration is close to the gas concentration extreme value and immediate measures must be taken.

[0090] For example, the gas monitoring terminal and the ground monitoring terminal use LoRa wireless transmission and low-power wide area network technology to ensure that information can be stably transmitted in a complex cable well environment and support long-distance communication with a maximum communication distance of up to 5 kilometers, meeting the cable well layout requirements of most cities.

[0091] The ground monitoring terminal includes a touch screen and a GPRSDTU module, which is used to process the gas concentration received in the cable well, generate a gas signal and display it on the touch screen.

[0092] For example, the ground monitoring terminal has a built-in GPRSDTU module and supports 4G network connection. It can upload the received gas signals such as gas concentration, date, construction content and alarm signal to the cloud server in real time through the cellular network to ensure the timeliness and completeness of the information, and support multi-operator network switching to ensure the continuity and stability of communication.

[0093] Exemplarily, the ground monitoring terminal is also equipped with a high-resolution touch screen, which displays the gas concentration data, alarm signals and historical trend charts in each cable well in real time. The touch screen adopts an explosion-proof design to adapt to outdoor use environments. Users can set parameters and configure the system through the touch screen, and the operation is simple and intuitive.

[0094] Exemplarily, the cloud server is used to receive gas signals such as gas concentration, date, construction content and alarm signals transmitted by the ground monitoring terminal, and generate gas concentration reports according to types such as cable well numbers, and analyze changes in gas concentration for early warning. At the same time, information such as gas concentration reports and warning signals can be sent to the mobile phone of the person in charge of the work, realizing cloud-based big data monitoring and alarm.

[0095] Exemplarily, the cloud server also includes a switch quantity module, which has 4 input and 4 output interfaces. When an alarm signal is received, the alarm signal is sent to lifting and handling equipment to achieve linkage. For example, when an alarm signal is received, the switch quantity module can automatically control the lifting equipment to open the inspection cover, which is convenient for operation and maintenance personnel to quickly handle it. It can also automatically start the ventilation equipment for ventilation, and turn on the lighting equipment and cameras at the same time to ensure a safe operating environment for the operation and maintenance personnel.

[0096] Since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the system in the embodiment of the present application, the implementation of the device refers to the implementation of the system, and the repeated parts will not be repeated.

[0097] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the method and device described above may refer to the corresponding process in the aforementioned system embodiment, and will not be repeated here.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be included in the scope of the claims of the present application.

Claims

1. Cable well gas concentration monitoring system, characterized in that: include: Data acquisition module, data transmission module, data processing module and visual display module; The data acquisition module is used to detect the gas concentration in the cable well through a gas detection probe; The data transmission module is used to transmit the gas concentration detected in the cable well to the ground monitoring terminal; The data processing module is used to process the gas concentration received in the cable well and generate a gas signal; The visual display module is used to visually display the gas signal and is equipped with an interface setting.

2. The system according to claim 1, characterized in that: The gas concentration in the cable well is detected by a gas detection probe, and the gas detection probe is automatically calibrated. The automatic calibration logic of the gas detection probe includes: Read the current gas concentration from the gas detection probe, monitor the ambient temperature and humidity data in real time, determine the temperature correction factor and humidity correction factor, correct the current gas concentration through the calibration compensation formula, and output the corrected gas concentration to compensate for the impact of changes in ambient temperature and humidity data on the gas detection probe.

3. The system according to claim 2, characterized in that: The functional expression of the calibration compensation formula is as follows: In the formula, g t Indicates the corrected gas concentration, g r represents the uncorrected current gas concentration, α represents the temperature correction coefficient, t represents the ambient temperature data, t0 represents the standard ambient temperature, β represents the humidity correction coefficient, h represents the ambient humidity data, and h0 represents the standard ambient humidity.

4. The system according to claim 3, characterized in that: The gas concentration detected in the cable well is transmitted to the ground monitoring terminal through LoRa technology. The deployment logic of LoRa includes: Each gas detection probe acts as a terminal node, responsible for regularly collecting gas concentrations and transmitting gas concentrations to nearby LoRa networks via LoRa wireless signals. The number and location of LoRa networks are determined based on the number and location of terminal nodes, and are adjusted by calculating spatial losses.

5. The system according to claim 4, characterized in that: The functional expression of the space loss is as follows: Where l represents the space loss value, d represents the distance from the LoRa network to the terminal node, d0 represents the standard distance, f represents the signal frequency, and k represents a constant.

6. The system according to claim 5, characterized in that: The generation logic of the gas signal includes: The gas concentration in the cable well is pre-processed and the gas concentration threshold is configured. The gas concentration threshold includes the gas concentration base value and the gas concentration extreme value. The gas concentration in the cable well is compared with the gas concentration threshold to determine whether an alarm is required. If the gas concentration in the cable well is less than the gas concentration base value, the alarm is not triggered. If the gas concentration in the cable well is greater than or equal to the gas concentration base value and the gas concentration in the cable well is less than or equal to the gas concentration extreme value, a level 1 alarm is triggered; If the gas concentration in the cable well is greater than the gas concentration limit, a secondary alarm will be triggered.

7. A cable well gas concentration monitoring method, implemented based on the cable well gas concentration monitoring system according to any one of claims 1 to 6, characterized in that: include: S1. Detect the gas concentration in the cable well through a gas detection probe; S2, transmitting the gas concentration detected in the cable well to the ground monitoring terminal; S3, processing the gas concentration received in the cable well to generate a gas signal; S4, visual display of gas signals, and equipped with interface settings.

8. A cable well gas concentration monitoring method, implemented based on the cable well gas concentration monitoring system according to any one of claims 1 to 6, characterized in that: include: Gas monitoring terminals and ground monitoring terminals; The gas monitoring terminal includes a housing, a gas detection probe and an alarm module. The gas detection probe detects the gas concentration in the cable well and determines whether to trigger an alarm based on the gas concentration. The ground monitoring terminal includes a touch screen and a GPRSDTU module, which is used to process the gas concentration received in the cable well, generate a gas signal and display it on the touch screen.

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