Drainage pipe network malodorous gas monitoring system and method based on gas-sensitive sensing

Abstract

The invention relates to the technical field of drainage pipe networks, and discloses a drainage pipe network malodorous gas monitoring system and method based on gas-sensitive sensing, and the system comprises an RFID electronic tag sensor which receives a detection radio frequency signal sent by an RFID tag read-write device, converts the detection radio frequency signal into an induction current, and adjusts the spectral characteristics of the induction current; the feedback radio frequency signal is sent to the RFID tag read-write device; the RFID tag read-write device converts the feedback radio frequency signal into a feedback digital signal, and the data background performs simulation analysis on the feedback digital signal to obtain a detection result of the concentration of the malodorous gas in the drainage pipe network and sends the detection result of the concentration of the malodorous gas in the drainage pipe network to the RFID tag read-write device for display. On the premise that the well lid is not opened, accurate detection of the concentration of the malodorous gas of the drainage pipe network is achieved, and the influence of gas exchange on the detection precision of the concentration of the malodorous gas when the well lid is opened is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage pipe networks, and in particular to a system and method for monitoring malodorous gases in drainage pipe networks based on gas sensitive sensing. Background Art

[0002] Urban drainage networks are a vital part of municipal infrastructure. Due to the accumulation of sediment and the growth of internal biofilms, a complex, foul-smelling gas mixture is generated within the pipes. This not only endangers the health of nearby residents and inspection workers, but also impacts the achievement of carbon emission reduction targets for the drainage network system. As environmental conditions change, the production of hydrogen sulfide and methane in the sediment can fluctuate significantly, impacting the subsequent control of harmful gases in the pipelines. To ensure the safety of pipeline and underground operations, as well as to control harmful gases in the pipelines, the detection of malodorous gases is essential.

[0003] The relevant pipeline odor gas monitoring method requires opening the manhole cover for testing. The gas exchange caused by opening the manhole cover will affect the accuracy of gas concentration detection, and when the concentration of odorous gas is high, it is easy to pose a threat to the health and safety of workers. Summary of the Invention

[0004] In view of this, the present invention provides a drainage network odor gas monitoring system and method based on gas sensitive sensing to solve the problem that opening the manhole cover for testing affects the accuracy of gas concentration detection, and that high odor gas concentrations can easily pose a threat to the health and safety of workers.

[0005] In a first aspect, the present invention provides a drainage network odor gas monitoring system based on gas sensing, comprising: a data background, an RFID tag reader / writer, and an RFID electronic tag sensor installed on the manhole cover or wall of a target inspection well; wherein the RFID electronic tag sensor, the RFID tag reader / writer, and the data background are sequentially connected via wireless communication;

[0006] The RFID electronic tag sensor is used to receive the detection radio frequency signal sent by the RFID tag reader / writer, convert the detection radio frequency signal into an induced current, adjust the spectrum characteristics of the induced current, obtain a feedback radio frequency signal, and send the feedback radio frequency signal to the RFID tag reader / writer;

[0007] RFID tag reading and writing device, used to convert the feedback radio frequency signal into feedback digital signal, and upload the feedback digital signal to the data background;

[0008] The data background is used to process the feedback digital signal, obtain the detection result of the odorous gas concentration in the drainage network, and send the detection result of the odorous gas concentration in the drainage network to the RFID tag reading and writing device for display.

[0009] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention receives the detection radio frequency signal sent by the RFID tag reader / writer through the RFID electronic tag sensor, converts the detection radio frequency signal into an induced current, and adjusts the spectrum characteristics of the induced current to obtain a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer; the RFID tag reader / writer then converts the feedback radio frequency signal into a feedback digital signal, and uploads the feedback digital signal to the data background; finally, the data background performs analog analysis on the feedback digital signal to obtain the detection result of the odor gas concentration in the drainage network, and sends the detection result of the odor gas concentration in the drainage network to the RFID tag reader / writer for display; without opening the manhole cover, accurate detection of the odor gas concentration in the drainage network is achieved, avoiding the threat to the health and safety of workers caused by excessive odor gas concentration, and reducing the impact of gas exchange caused by opening the manhole cover on the accuracy of odor gas concentration detection.

[0010] In an optional embodiment, an RFID electronic tag sensor includes: a substrate, and a receiving antenna, a transmitting antenna, and a resonant module disposed on the substrate; the receiving antenna and the transmitting antenna are respectively connected to an RFID tag reader / writer, and the receiving antenna, the transmitting antenna, and the resonant module are connected in sequence;

[0011] The receiving antenna is used to receive the detection radio frequency signal sent by the RFID tag reading and writing device, convert the detection radio frequency signal into an induced current, and send the induced current to the resonant module;

[0012] The resonance module is used to encode the induced current and adjust the spectrum characteristics of the encoded induced current using the characteristic variation of the gas-sensitive sensing material to obtain the feedback induced current, and send the feedback induced current to the transmitting antenna;

[0013] The transmitting antenna is used to convert the feedback induced current into a feedback radio frequency signal and send the feedback radio frequency signal to the RFID tag reading and writing device.

[0014] The drainage pipe network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention receives the detection radio frequency signal sent by the RFID tag reader / writer through the receiving antenna, converts the detection radio frequency signal into an induced current, and sends the induced current to the resonance module; the resonance module encodes the induced current, and uses the characteristic change of the sensing material to adjust the spectral characteristics of the encoded induced current to obtain a feedback induced current, and sends the feedback induced current to the transmitting antenna; the transmitting antenna converts the feedback induced current into a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer; the conversion of the detection radio frequency signal into a feedback radio frequency signal is realized, laying the foundation for the detection of odor gas concentration in the drainage pipe network.

[0015] In an optional embodiment, the resonance module includes: an encoding unit and a sensing unit; the encoding unit is connected to the receiving antenna, and the sensing unit is connected to the transmitting antenna; the encoding unit includes a plurality of resonant structures, and the sensing unit includes a gas sensitive material film and an electrode;

[0016] The encoding unit is used to adjust the amplitude and frequency of the induced current by using the shape and number of the resonant structure to obtain the encoded induced current;

[0017] The sensing unit is used to collect the resistance change and dielectric constant change caused by the combination of environmental variables and the gas sensitive material film, and adjust the spectral characteristics of the encoded induced current based on the resistance change and dielectric constant change to obtain the feedback induced current, and send the feedback induced current to the transmitting antenna.

[0018] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention encodes the induced current through the encoding unit to obtain the encoded induced current. The sensing unit adjusts the spectral characteristics of the encoded induced current based on the resistance change and the dielectric constant change, thereby achieving adjustment of the spectral characteristics of the induced current and obtaining the feedback induced current, which lays the foundation for the detection of the odor gas concentration in the drainage network.

[0019] In an optional embodiment, an RFID tag reading and writing device includes: a control unit, a reading and writing unit, and an antenna circuit; wherein the control unit is wirelessly connected to a data background, the antenna circuit is wirelessly connected to an RFID electronic tag sensor, and the control unit, the reading and writing unit, and the antenna circuit are connected in sequence;

[0020] A read / write unit, configured to receive a detection digital signal sent by the control unit, convert the detection digital signal into a detection radio frequency signal, and send the detection radio frequency signal to the antenna circuit;

[0021] The antenna circuit is used to send the detection radio frequency signal to the RFID electronic tag sensor, receive the feedback radio frequency signal sent by the RFID electronic tag sensor, and send the feedback radio frequency signal to the read-write unit;

[0022] The read / write unit is also used to convert the feedback radio frequency signal into a feedback digital signal, and send the feedback digital signal to the data background wirelessly through the control unit.

[0023] The drainage pipe network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention converts the feedback radio frequency signal into a feedback digital signal through the read-write unit, thereby realizing the reading of the information stored in the RFID electronic tag sensor; sends the detection radio frequency signal to the RFID electronic tag sensor through the antenna circuit, and receives the feedback radio frequency signal sent by the RFID electronic tag sensor, thereby realizing data interaction between the RFID electronic tag sensor and the RFID read-write device, laying the foundation for the detection of odor gas concentration in the drainage pipe network.

[0024] In an optional embodiment, the data background is specifically used to process the feedback digital signal, and use a neural network model to perform sensor data simulation on the feedback digital signal after data processing to obtain the detection result of the odor gas concentration in the drainage network.

[0025] The drainage network odor gas monitoring system based on gas sensitive sensing provided in the embodiment of the present invention accurately outputs the detection results of the odor gas concentration in the drainage network by processing the feedback digital signal and simulating the sensor data of the feedback digital signal after data processing, thereby providing a data basis for controlling harmful gases in the drainage network.

[0026] In an optional embodiment, the data background is also used to obtain sensor codes and partition and store the detection results of the odorous gas concentration of the drainage network according to the sensor codes.

[0027] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention obtains the sensor code and partitions the detection results of the drainage network odor gas concentration according to the sensor code, laying the foundation for analyzing the spatiotemporal distribution characteristics of the drainage network odor gas concentration.

[0028] In an optional embodiment, it also includes: a cloud application platform, connected to the data background, for analyzing and predicting the concentration of odorous gases in the drainage network, obtaining the predicted results of the concentration of odorous gases in the drainage network, and comparing the predicted results of the concentration of odorous gases in the drainage network with a preset threshold value to obtain odor warning information of the drainage network.

[0029] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention realizes the spatiotemporal prediction of the odor gas concentration in the drainage network by analyzing and predicting the odor gas concentration in the drainage network, and compares the predicted result of the odor gas concentration in the drainage network with the preset threshold value to obtain odor early warning information of the drainage network, laying the foundation for reasonably setting the control plan for the odor gas concentration in the drainage network.

[0030] In an optional embodiment, the cloud application platform is specifically used to perform simulation prediction based on the detection results of the odorous gas concentration in the drainage network using a neural network model and a SWMM model to obtain the prediction results of the odorous gas concentration in the drainage network.

[0031] The drainage network odor gas monitoring system based on gas sensing provided in an embodiment of the present invention uses a neural network model and a SWMM model to perform simulation and prediction based on the detection results of the odor gas concentration in the drainage network, extracts the temporal and spatial characteristics of the odor gas concentration in the drainage network, and then accurately predicts the odor gas concentration in the drainage network, providing a data basis for controlling the odor gas concentration in the drainage network.

[0032] In an optional embodiment, the cloud application platform is also used to send the drainage network odor warning information to the RFID tag reader / writer or the operation and maintenance personnel's handheld device for display, so as to control the odor gas in the drainage network.

[0033] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention sends the drainage network odor warning information to the RFID tag reader and writer for display, so that the staff can take corresponding control measures based on the odor warning information, so that the odor gas concentration in the drainage network can be maintained within a relatively safe range.

[0034] In a second aspect, the present invention provides a method for monitoring the concentration of malodorous gases in a drainage network, comprising the drainage network malodorous gas monitoring system based on gas sensing according to the first aspect or any corresponding embodiment thereof, the method comprising:

[0035] The RFID electronic tag sensor receives the detection radio frequency signal sent by the RFID tag reader / writer, converts the detection radio frequency signal into an induced current, adjusts the spectrum characteristics of the induced current, obtains a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer;

[0036] The RFID tag reading and writing device converts the feedback radio frequency signal into a feedback digital signal and uploads the feedback digital signal to the data background;

[0037] The data background processes the feedback digital signal to obtain the detection result of the odorous gas concentration in the drainage network, and sends the detection result of the odorous gas concentration in the drainage network to the RFID tag reading and writing device for display. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a structural block diagram of a drainage network odor gas monitoring system based on gas sensing according to an embodiment of the present invention;

[0040] Figure 2 1 is a flow chart of a monitoring method of a drainage network odor gas monitoring system based on gas sensing according to an embodiment of the present invention;

[0041] Figure 3 This is a structural block diagram of an RFID electronic tag sensor according to an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of a generation flow of a method for feedback induced current according to an embodiment of the present invention;

[0043] Figure 5 is a structural block diagram of an RFID tag reading and writing device according to an embodiment of the present invention;

[0044] Figure 6 The present invention is a flowchart of a method for monitoring malodorous gases in a drainage network based on gas sensing. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0046] Radio Frequency Identification (RFID) is a contactless automatic identification technology that uses radio frequency to obtain and identify objects. It has the advantages of long reading distance, strong penetration, large information content, high efficiency, and anti-interference. A common RFID system mainly consists of three parts: tags, readers, and data management systems. The reader uses radio frequency signals to issue instructions and provide energy to tags within its coverage area. Tags carry a globally unique ID (identification) number to identify the target object and respond to the reader through inductive or electromagnetic coupling to complete sensing, positioning, identity recognition, and information exchange. The terminal server (i.e., reader) parses the tag information transmitted by the reader to achieve efficient tag management and provide data support for upper-level applications. RFID systems can be divided into low-frequency, high-frequency, ultra-high-frequency, and microwave types according to different operating frequencies. According to the power supply method, RFID tags can be classified into three types: active tags, semi-active tags, and passive tags.

[0047] RFID is a sensor that is used to identify objects and cannot directly identify the current environment. However, with the continuous advancement of chip, antenna and computer related technologies, the power consumption and cost of RFID electronic tags are getting lower and lower, and their functions are becoming more and more abundant. Using RFID power supply to achieve passive sensing has become a research direction. RFID systems with passive sensing functions do not require battery power like ordinary sensors, and are expected to overcome the limitations of battery life, size and price. Therefore, RFID with passive sensing functions plays an important role in the process of building the perception layer of the Internet of Things. Using RFID tags as sensor nodes of the Internet of Things can not only identify the identity information of the nodes, but also perceive the information of the environment in which the nodes are located. At the same time, combining the identity information of the nodes with the environmental information can greatly expand the application scenarios of the Internet of Things.

[0048] Environmental monitoring often requires a large number of gas sensors, including electrochemical sensors, optical sensors, and piezoelectric sensors, which are used to measure gas concentrations. However, these sensors often suffer from complex sampling and analysis processes, high costs, and time-consuming processes. The most critical part of a gas sensor is the gas sensitive element, which is used to directly contact the gas to be measured. Gas sensitive elements are generally made of gas-sensitive materials, mainly metal oxide semiconductors and their derivatives.

[0049] At the same time, related online gas sensors need to integrate circuit modules such as control chips, signal conditioning, digital-to-analog conversion, and radio frequency transceivers. The circuit structure is complex and the production cost is high, requiring regular calibration maintenance and power supply replacement.

[0050] Drainage pipelines are a vital part of infrastructure. Due to the accumulation of sediment at the bottom of the pipelines and the growth of internal biofilms, a complex mixture of gases with a foul odor will be generated in the pipes. These gases include methane, ammonia, hydrogen sulfide, methyl mercaptan, etc., with hydrogen sulfide being the main component. This not only endangers the health of nearby residents and maintenance workers, but also affects the achievement of carbon emission reduction targets for the drainage system. As environmental conditions change, the production of hydrogen sulfide and methane in the bottom sediment of the pipelines will fluctuate significantly, affecting the subsequent control of harmful gases in the pipelines. In order to ensure the safety of the pipeline network and underground operations and to control harmful gases in the pipeline network, the detection of odorous gases is an essential measure.

[0051] There are two main methods for detecting gas in drainage pipe networks. One is manual gas detection using portable gas detection instruments. Through continuous monitoring, it provides timely, accurate and reliable basis for pipe network and underground construction. The other method is to use fixed monitoring equipment to detect gas inside the pipe. The existing pipeline odor gas monitoring methods have the following shortcomings:

[0052] 1) When using portable detection instruments, the manhole cover needs to be opened for testing. When the concentration of malodorous gas is high, it is easy to pose a threat to the health and safety of workers;

[0053] 2) Gas exchange caused by opening the manhole cover will affect the accuracy of gas concentration detection;

[0054] 3) The installation of online monitoring instruments is cumbersome and costly, making them difficult to install on a large scale;

[0055] 4) Online monitoring instruments require regular calibration maintenance and power supply replacement;

[0056] 5) Related gas sensors need to convert the resistance changes of gas-sensitive materials into voltage changes. They need to go through signal conditioning, AD conversion (Analog-to-Digital, analog-to-digital conversion), RF transceiver and other circuit modules to achieve wireless signal transmission. Therefore, they have the disadvantages of complex circuit structure and high production cost.

[0057] In order to solve the above technical problems, the embodiments of the present invention provide a drainage pipe network odor gas monitoring system based on gas sensing, which can realize odor gas concentration monitoring when the cover is not opened, reduce the direct impact of odor gas on workers and the interference of gas exchange on detection accuracy when the manhole cover is opened; the RFID electronic tag sensor in the drainage pipe network odor gas monitoring system based on gas sensing can realize odor gas detection in a passive and chip-free manner, without the need to integrate complex circuits, with a simple structure, low manufacturing difficulty, simple later maintenance, and can be deployed over a large area.

[0058] In this embodiment, a drainage pipe network odor gas monitoring system based on gas sensing is provided. Figure 1 As shown, it includes: a data background 101, an RFID tag reading and writing device 102 and an RFID electronic tag sensor 103 set on the target inspection well cover or well wall; wherein, the RFID electronic tag sensor 103, the RFID tag reading and writing device 102 and the data background 101 are connected in sequence through wireless.

[0059] The RFID electronic tag sensor 103 is used to receive the detection radio frequency signal sent by the RFID tag reader / writer 102, convert the detection radio frequency signal into an induced current, adjust the spectrum characteristics of the induced current, obtain a feedback radio frequency signal, and send the feedback radio frequency signal to the RFID tag reader / writer 102.

[0060] Specifically, the RFID electronic tag sensor 103 adopts a passive chipless ultra-high frequency RFID gas sensor tag, wherein the RFID electronic tag sensor 103 is integrated into the back of the manhole cover when the manhole cover is manufactured, or the RFID electronic tag sensor 103 is attached to the back of the manhole cover or to the inspection well wall close to the manhole cover during the operation and maintenance stage.

[0061] Furthermore, after the RFID tag reader / writer 102 is powered on, it transmits a detection radio frequency signal of a specific frequency. The RFID electronic tag sensor 103 receives the detection radio frequency signal and converts the detection radio frequency signal into an induced current to generate electrical energy. After the electrical energy activates the RFID electronic tag sensor 103, different malodorous gas concentrations will affect the characteristics of the gas-sensitive material in the RFID electronic tag sensor 103. The characteristics of the gas-sensitive material affected by the malodorous gas concentration change the spectrum characteristics of the detection radio frequency signal by adjusting the induced current, obtaining a feedback radio frequency signal, and transmitting the feedback radio frequency signal back to the RFID tag reader / writer 102.

[0062] The RFID tag reading and writing device 102 is used to convert the feedback radio frequency signal into a feedback digital signal and upload the feedback digital signal to the data background 101.

[0063] Specifically, if Figure 2As shown, the operation and maintenance personnel hold the RFID tag reading and writing device 102, or integrate the RFID tag reading and writing device 102 into the operation and maintenance vehicles and road maintenance facilities; among them, manual inspection is mainly for pipeline network inspection and repair workers, and H2S concentration detection can be completed by holding the RFID tag reading and writing device 102 during pipeline inspection; operation and maintenance vehicles such as sprinkler trucks need to perform maintenance work such as road cleaning on a regular basis every day, and can detect the H2S concentration in the drainage pipes along the way while driving slowly on the road; road maintenance facilities, when conditions permit, can integrate RFID tag reading and writing devices 102 into road facilities such as the bottom of street lights and bus stops at key topological nodes of the drainage network to perform real-time online monitoring of the H2S concentration in nearby pipelines.

[0064] Furthermore, the RFID tag reading and writing device 102 is connected to the data background 101 and the cloud application platform 104 via wireless communication, and the RFID tag reading and writing device 102 uploads feedback digital signals with different spectrum characteristics to the data background 101 .

[0065] The data background 101 is used to process the feedback digital signal to obtain the detection result of the odor gas concentration in the drainage network, and send the detection result of the odor gas concentration in the drainage network to the RFID tag reading and writing device 102 for display.

[0066] Specifically, the RFID tag reading and writing device 102 is wirelessly connected to the data background. The RFID tag reading and writing device 102 uploads data with different spectral characteristics (i.e., feedback digital signals) to the data background. The data background 101 processes and simulates the feedback digital signals to generate information such as gas concentration, matches it with the tag code pre-recorded in the data background 101, and transmits it back to the RFID tag reading and writing device 102 for reference.

[0067] Furthermore, the data backend 101 and the RFID tag reading and writing device 102 are connected wirelessly to perform data processing, sensor data simulation, storage and comprehensive interaction on the feedback digital signal.

[0068] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention receives the detection radio frequency signal sent by the RFID tag reader / writer through the RFID electronic tag sensor, converts the detection radio frequency signal into an induced current, and adjusts the spectrum characteristics of the induced current to obtain a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer; the RFID tag reader / writer then converts the feedback radio frequency signal into a feedback digital signal, and uploads the feedback digital signal to the data background; finally, the data background performs analog analysis on the feedback digital signal to obtain the detection result of the odor gas concentration in the drainage network, and sends the detection result of the odor gas concentration in the drainage network to the RFID tag reader / writer for display; without opening the manhole cover, accurate detection of the odor gas concentration in the drainage network is achieved, avoiding the threat to the health and safety of workers caused by excessive odor gas concentration, and reducing the impact of gas exchange caused by opening the manhole cover on the accuracy of odor gas concentration detection.

[0069] In an optional embodiment, the RFID electronic tag sensor 103, such as Figure 3 As shown, it includes: a substrate 1031, and a receiving antenna 1032, a transmitting antenna 1033 and a resonance module 1034 arranged on the substrate 1031; the receiving antenna 1032 and the transmitting antenna 1033 are respectively connected to the RFID tag reader / writer 102, and the receiving antenna 1032, the transmitting antenna 1033 and the resonance module 1034 are connected in sequence.

[0070] Specifically, the substrate 1031 supports and fixes other components of the tag. The substrate 1031 can be made of flexible materials such as polytetrafluoroethylene copper foil F4BM, Taconic TLX-8 (a polytetrafluoroethylene glass fiber laminate), and paper.

[0071] The receiving antenna 1032 is used to receive the detection radio frequency signal sent by the RFID tag reading and writing device 102, convert the detection radio frequency signal into an induced current, and send the induced current to the resonance module 1034.

[0072] Specifically, the receiving antenna 1032 is used to receive the detection radio frequency signal from the RFID tag reading and writing device 102 , obtain the induced current, and generate electric energy to activate the resonance module 1034 .

[0073] The resonance module 1034 is used to encode the induced current and adjust the spectrum characteristics of the encoded induced current using the characteristic variation of the gas-sensitive sensing material to obtain the feedback induced current, and send the feedback induced current to the transmitting antenna 1033 .

[0074] Specifically, the resonance module 1034 mainly functions to realize the tag encoding function and the function of sensing the change of gas concentration.

[0075] The transmitting antenna 1033 is used to convert the feedback induced current into a feedback radio frequency signal, and send the feedback radio frequency signal to the RFID tag reading and writing device 102 .

[0076] Specifically, the function of the transmitting antenna 1033 is to convert the feedback induced current generated by the resonance module 1034 into a radio frequency signal and transmit it to the outside so as to be transmitted back to the RFID tag reading and writing device 102 .

[0077] The drainage pipe network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention receives the detection radio frequency signal sent by the RFID tag reader / writer through the receiving antenna, converts the detection radio frequency signal into an induced current, and sends the induced current to the resonance module; the resonance module encodes the induced current, and uses the characteristic change of the sensing material to adjust the spectral characteristics of the encoded induced current to obtain a feedback induced current, and sends the feedback induced current to the transmitting antenna; the transmitting antenna converts the feedback induced current into a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer; the conversion of the detection radio frequency signal into a feedback radio frequency signal is realized, laying the foundation for the detection of odor gas concentration in the drainage pipe network.

[0078] In an optional embodiment, the resonance module 1034 includes: an encoding unit 10341 and a sensing unit 10342; the encoding unit 10341 is connected to the receiving antenna 1032, and the sensing unit 10342 is connected to the transmitting antenna 1033; the encoding unit 10341 includes multiple resonant structures, and the sensing unit 10342 includes a gas-sensitive material film and an electrode.

[0079] The encoding unit 10341 is used to adjust the amplitude and frequency of the induced current by using the shape and number of the resonant structures to obtain the encoded induced current.

[0080] Specifically, the encoding unit is mainly composed of multiple resonant structures, each of which will produce a resonant peak or a resonant valley at a specific frequency. These frequency characteristics are used to represent different encoding states, that is, each resonant structure can independently adjust its resonant frequency to achieve multi-bit encoding, generating resonance and stopband at a specific frequency. The stopband and resonance introduce amplitude attenuation and phase jump into the transmitted interrogation signal at its resonant frequency, which the RFID reader will detect as amplitude mutation and phase jump.

[0081] Furthermore, under high-frequency conditions, the resonant structure can be equivalent to a series-parallel circuit of multiple inductors and capacitors. Its performance mainly depends on two parameters: the resonant center frequency f and the quality factor Q of the resonant structure. The calculation formulas of the resonant center frequency f and the quality factor Q are as follows:

[0082]

[0083] Wherein, L is the equivalent inductance of the resonant structure, C is the equivalent capacitance of the resonant structure, ω is the resonant angular frequency, and R is the equivalent reactance of the resonant structure.

[0084] Furthermore, different L and C can make the resonant structure produce different resonant center frequencies. When the induced current passes through the resonant structure, it will produce different characteristics of amplitude and frequency changes according to the different resonant structures. Therefore, the spectrum characteristics of the induced current can be used to store information and realize the encoding of the tag. The encoded induced current can be Figure 3 Multi-digit ID response in .

[0085] The sensing unit 10342 is used to collect the resistance change and dielectric constant change caused by the combination of environmental variables and the gas sensitive material film, and adjust the spectral characteristics of the encoded induced current based on the resistance change and dielectric constant change to obtain feedback induced current, and send the feedback induced current to the transmitting antenna 1033.

[0086] Specifically, the sensing unit 10342 is loaded between the encoding unit 10341 and the transmitting antenna 1033 in the form of resistance or capacitance, and is mainly composed of a gas-sensitive material film and electrodes. Changes in environmental parameters change the impedance or dielectric constant of the gas-sensitive material film, thereby changing the reflected power and spectral characteristics of the backscattered signal of the transmitting antenna. By identifying the characteristics of the signal changes and fitting them, the characterization of the environmental parameters can be achieved.

[0087] Furthermore, the electrode part adopts a planar interdigitated electrode structure, and the gas sensitive material film part includes a MOFs (Metal-Organic MoS2 (molybdenum disulfide), ZnO (zinc oxide), SnO2 (tin dioxide), WO3 (tungsten trioxide), In2O3 (indium trioxide), CuO (copper oxide) and Co3O4 (cobalt tetroxide) derived from the metal organic framework (MOF) structure, as well as heterogeneous and homogeneous structures and doped materials of the above compounds. The above sensitive materials can affect their own electron and hole transfer by adsorbing H2S (hydrogen sulfide), changing the dielectric constant and resistance; among them, MOFs is an ideal precursor material. By oxidative pyrolysis of MOFs, MOFs derivatives can be obtained. MOFs contain regular metal nodes and functional organic ligands as well as additional cavities, which match the precursors required for the preparation of porous metal oxides. MOFs-derived oxides can inherit the high porosity and high specific surface area of ​​MOFs precursors, which is conducive to the diffusion of gas in the gas-sensitive reaction process and promotes the surface reaction between gas and sensing layer; by calculating the change in power reflection coefficient, the RFID tag-type gas sensor can detect the target gas. The calculation formula of the reflection coefficient is as follows:

[0088]

[0089] Where Zload is the impedance of the transmit antenna load, ZANT is the impedance of the transmit antenna, and ZANT* is the conjugate form of the transmit antenna impedance.

[0090] Furthermore, when the RFID tag reader / writer 102 detects that the reflected power and spectral characteristics of the transmitting antenna 1033 have changed, it means that the impedance value of the transmitting antenna and the impedance value of its load have changed, which in turn means that the gas-sensitive material film has detected gas; at the same time, the sensing unit 10342 can replace different gas-sensitive materials to realize the detection of different gases, and the detectable gases include ammonia, CO2 (carbon dioxide), etc.

[0091] Furthermore, the manufacturing process of the sensing unit 10342 is as follows: 1) Preparation of MOFs-derived gas-sensitive materials: preparation of precursors; preparation of metal oxide precursors; preparation of MOFs-derived metal oxides, different metal oxide precursors are calcined at a constant temperature for a certain time at a constant heating rate to obtain gas-sensitive materials; 2) The interdigitated electrodes are prepared by screen printing process, 1% diluent is added to an appropriate amount of carbon paste and stirred evenly; then the conductive carbon paste is printed on a clean PET (Polyethylene Terephthalate) surface by screen printing, and placed in a blast drying oven at 120°C for 20 minutes to obtain a flexible carbon paste interdigitated electrode; 3) The gas-sensitive material film is realized by direct coating method, a certain amount of gas-sensitive material is weighed, and a certain volume of deionized water is added to dissolve it. The above solution was placed in an ultrasonic cleaner and ultrasonicated for 20 minutes. A certain amount of PVA (Polyvinyl Alcohol) was weighed and added to the solution. The solution was magnetically stirred at 60° C. for 4 hours. The interdigitated electrodes were attached to a glass slide and spin-coated to prepare a thin film.

[0092] Furthermore, if Figure 4 As shown in the figure, the principle of the sensing unit is: when hydrogen sulfide molecules contact the surface of the gas-sensitive material, the injection of electrons or holes will cause a change in the carrier concentration, thereby causing changes in the material properties of the carbon nanotubes such as the resistance value and dielectric constant, further leading to antenna frequency detuning or impedance mismatch. From the characteristics of the RF signal, mainly including resonant conversion, radar scattering cross section change and return loss change, the specific impact in the circuit is to further change the frequency and amplitude of the encoded induced current. The spectrum of the feedback induced current can be Figure 3 The sensor response in the sensing unit 10342 can affect the gas sensitive material film due to the change in gas concentration, thereby further changing the frequency and amplitude of the encoded induced current. After the signal characteristics are superimposed, it can reflect both the encoded information and the change in gas concentration.

[0093] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention encodes the induced current through the encoding unit to obtain the encoded induced current. The sensing unit adjusts the spectral characteristics of the encoded induced current based on the resistance change and the dielectric constant change, thereby achieving adjustment of the spectral characteristics of the induced current and obtaining the feedback induced current, which lays the foundation for the detection of the odor gas concentration in the drainage network.

[0094] In an optional embodiment, the RFID tag reading and writing device 102 includes: a control unit 1021, a reading and writing unit 1022 and an antenna circuit 1023; wherein the control unit 1021 is wirelessly connected to the data background 101, the antenna circuit 1023 is wirelessly connected to the RFID electronic tag sensor 103, and the control unit 1021, the reading and writing unit 1022 and the antenna circuit 1023 are connected in sequence.

[0095] The read / write unit 1022 is configured to receive the detection digital signal sent by the control unit 1021 , convert the detection digital signal into a detection radio frequency signal, and send the detection radio frequency signal to the antenna circuit 1023 .

[0096] Specifically, the control unit mainly performs functions such as external data communication, information storage and display, and power control. The control unit controls the power supply, completes the conversion of digital signals into radio frequency signals through the read-write unit, and sends and receives radio frequency signals returned by the tag through the antenna circuit. The radio frequency signals returned by the antenna are converted into digital signals through the read-write unit.

[0097] Furthermore, if Figure 5 As shown, the control unit 1021 includes: an MCU (Microcontroller Unit) main controller, a control interface, a power supply circuit, a serial interface circuit, a crystal oscillator circuit, and an expansion interface; the functions of the MCU main controller include: detecting digital signals and controlling the transmission and reception of feedback digital signals, communicating data with the data background 101 and the radio frequency chip, and storing information; the control interface connects the MCU main controller and the radio frequency chip to communicate the address line, data line, and control line; the power supply circuit is connected to a portable power supply or the power supply of a municipal operation and maintenance vehicle to provide power for the RFID tag reader 102; the serial interface circuit can control the transmission and reception of signals on the RFID tag reader 102 through the vehicle's control system; the crystal oscillator circuit generates a stable system clock signal; and the expansion interface can be connected to external devices such as external storage.

[0098] Furthermore, the read-write unit 1022 includes: a radio frequency chip and a filtering circuit. The radio frequency chip can receive the detection digital signal transmitted by the MCU main controller, convert the detection digital signal into a detection radio frequency signal, transmit the detection radio frequency signal and receive the feedback radio frequency signal, amplify the weak detection radio frequency signal and the feedback radio frequency signal, and convert the detection radio frequency signal and the feedback radio frequency signal into the detection digital signal and the feedback digital signal; the filtering circuit is used to filter the interference noise of the detection radio frequency signal and the feedback radio frequency signal.

[0099] The antenna circuit 1023 is configured to send a detection radio frequency signal to the RFID electronic tag sensor 103 , receive a feedback radio frequency signal sent by the RFID electronic tag sensor 103 , and send the feedback radio frequency signal to the read-write unit 1022 .

[0100] Specifically, the antenna circuit 1023 includes: a matching circuit and an antenna coil. The matching circuit ensures that the energy of the detection RF signal emitted by the RF chip is transmitted to the antenna coil as much as possible, reducing energy loss and improving the stability of the circuit; the antenna coil transmits the detection RF signal transmitted by the read-write unit 1022 and receives the feedback RF signal returned by the RFID electronic tag sensor 103.

[0101] Furthermore, the matching circuit realizes impedance matching between the antenna coil and the RFID electronic tag sensor 103 and the RFID tag reading and writing device 102, ensuring efficient power transmission, reducing the reflection of the detection radio frequency signal and the feedback radio frequency signal, avoiding signal distortion and reduction of transmission efficiency, and ensuring the normal operation of the RFID electronic tag sensor 103 and accurate signal transmission; at the same time, the matching circuit improves the anti-interference ability, and improves the stability and reliability of the system in complex electromagnetic environments by suppressing specific frequency noise and optimizing frequency response; it can also enhance the signal receiving and transmitting efficiency, and use the inductor and capacitor to form a tuning circuit to make the antenna resonate, achieve bandwidth matching, and ensure accurate data transmission; in addition, the design can be adjusted according to the characteristics of different antennas and chips to enhance compatibility, and the system performance can be maintained stable by adjusting parameters to adapt to environmental changes.

[0102] The read / write unit 1022 is further configured to convert the feedback radio frequency signal into a feedback digital signal, and transmit the feedback digital signal to the data backend 101 via the control unit in a wireless manner 1021 .

[0103] Furthermore, when the RFID tag reading and writing device 102 is integrated into a maintenance vehicle, the control unit 1021 and the reading and writing unit 1022 are integrated into the interior of the maintenance vehicle, and the antenna circuit 1023 is integrated into the bottom of the vehicle. The operation and maintenance vehicles include sprinkler trucks, garbage trucks and other patrol vehicles; road facilities include street lights, bus stops, etc.

[0104] The drainage pipe network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention converts the feedback radio frequency signal into a feedback digital signal through the read-write unit, thereby realizing the reading of the information stored in the RFID electronic tag sensor; sends the detection radio frequency signal to the RFID electronic tag sensor through the antenna circuit, and receives the feedback radio frequency signal sent by the RFID electronic tag sensor, thereby realizing data interaction between the RFID electronic tag sensor and the RFID read-write device, laying the foundation for the detection of odor gas concentration in the drainage pipe network.

[0105] In an optional embodiment, the data background 101 is specifically used to process the feedback digital signal, and use a neural network model to perform sensor data simulation on the feedback digital signal after data processing to obtain the detection result of the odor gas concentration in the drainage network.

[0106] Specifically, data processing of the feedback digital signal includes signal amplification, signal comparison, signal decompression, neural network simulation, data cleaning and other operations, among which signal amplification, comparison and decompression are for digital signals; the neural network simulation is mainly completed by a multi-layer perceptron (MLP) network, which inputs the feedback digital signal, extracts the feedback digital signal features (amplitude, frequency and return loss, etc., especially when the input data has a complex nonlinear relationship), and combines the corresponding relationship model between the feedback digital signal features and the gas concentration to complete the conversion of features to gas concentration, and output the odorous gas concentration (that is, the detection result of the odorous gas concentration in the drainage network).

[0107] Furthermore, changes in the concentration of malodorous gases will lead to changes in the relevant characteristics of gas-sensitive materials, which are reflected in changes in the amplitude and characteristic signals of the feedback radio frequency signal. The pre-processed feedback digital signal features are extracted using a multi-layer perceptron. The multi-layer perceptron is a type of deep learning model. Before actual application, the model should be trained based on historical data and actual experimental values, such as a training set consisting of gas concentrations corresponding to different feedback digital signal features. During training, the model results are evaluated using methods such as mean squared error (MSE), root mean square error (RMSE) or mean absolute error (MAE), and the weight parameters and configuration of the model simulation are continuously optimized. After the training is completed, in actual applications, the gas concentration is obtained by fitting the model using the real-time received feedback digital signal features. In essence, the conversion of features to gas concentration is completed by fitting the corresponding relationship model between the characteristic values ​​and gas concentrations using the empirical parameters of the actual data.

[0108] Furthermore, the comprehensive interaction includes data transmission and operation between the detection results of the odorous gas concentration in the treated drainage network and the RFID tag reading and writing device 102, such as data correction and display.

[0109] The drainage network odor gas monitoring system based on gas sensitive sensing provided in the embodiment of the present invention accurately outputs the detection results of the odor gas concentration in the drainage network by processing the feedback digital signal and simulating the sensor data of the feedback digital signal after data processing, thereby providing a data basis for controlling harmful gases in the drainage network.

[0110] In an optional embodiment, the data background 101 is further used to obtain sensor codes and partition and store the detection results of the odorous gas concentration of the drainage network according to the sensor codes.

[0111] Specifically, the output detection results of the malodorous gas concentration of the drainage network are partitioned and stored according to the sensor code pre-recorded in the data background 101 after data cleaning and elimination of abnormal values; wherein the sensor code consists of two letters and eight digits, such as WS01083001, the first two digits WS represent the network type, the middle six digits correspond to the drainage network inspection well or treatment facility number, and the last two digits distinguish the sensor type, for example, 01 is an H2S sensor, 02 is a CH4 (methane) sensor, etc.

[0112] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention obtains the sensor code and partitions the detection results of the drainage network odor gas concentration according to the sensor code, laying the foundation for analyzing the spatiotemporal distribution characteristics of the drainage network odor gas concentration.

[0113] In an optional embodiment, it also includes: a cloud application platform 104, which is connected to the data background 101, and is used to analyze and predict the concentration of odorous gases in the drainage network, obtain the predicted result of the concentration of odorous gases in the drainage network, and compare the predicted result of the concentration of odorous gases in the drainage network with a preset threshold to obtain odor warning information of the drainage network.

[0114] Specifically, the cloud application platform 104 integrates GIS (Geographic Information System) and neural network models to implement basic functions such as analysis, display, and prediction or early warning of odor conditions in the drainage network, thereby supporting the control of odorous gases.

[0115] The drainage network odor gas monitoring system based on gas sensitive sensing provided by the embodiment of the present invention realizes the prediction of the odor gas concentration in the drainage network by analyzing and predicting the odor gas concentration in the drainage network, and compares the predicted result of the odor gas concentration in the drainage network with the preset threshold value to obtain odor warning information of the drainage network, laying the foundation for reasonably setting the control plan for the odor gas concentration in the drainage network.

[0116] In an optional embodiment, the cloud application platform 104 is specifically used to perform simulation prediction using a neural network model and a SWMM model based on the detection results of the odorous gas concentration in the drainage network to obtain the prediction results of the odorous gas concentration in the drainage network.

[0117] Specifically, the analysis and prediction function of the cloud application platform 104 is mainly completed by a neural network model combined with a SWMM (StormWater Management Model) model. The SWMM model can establish a theoretical model based on a real drainage network, input water quality and water quantity parameters, and based on the detection results of the odorous gas concentration in the drainage network, consider the relationship between the odorous gas concentration and dissolved oxygen (Dissolved Oxygen, abbreviated as DO), pH value (Potential of Hydrogen) and organic matter content, simulate the spatiotemporal changes of the gas concentration in the drainage network, and output the spatiotemporal information and gas concentration of the odorous gas.

[0118] Furthermore, based on the locations and times of the drainage network and the corresponding gas concentrations output by the SWMM model, convolutional neural network (CNN) and long short-term memory network (LSTM) models are used for simulation and prediction, and the predicted gas concentration and alarm information after reaching the set threshold are output; among them, CNN is mainly used to extract spatial features, such as the distribution of odorous gas concentrations at different locations, and LSTM is mainly used to extract time series features, such as the change of odorous gas concentrations over time; the output features of the CNN and LSTM models are fused to form a comprehensive feature vector, which monitors the odorous gas concentration in real time and outputs the predicted results of the odorous gas concentration in the drainage network; among them, the comprehensive feature vector includes the gas concentration time change feature vector and the spatial change feature vector.

[0119] Furthermore, the predicted result of the odor gas concentration in the drainage network is compared with a preset threshold value to obtain odor warning information of the drainage network.

[0120] Furthermore, the cloud application platform can be accessed and displayed through computers, mobile phones, reading and writing devices, and mobile patrol devices.

[0121] The drainage network odor gas monitoring system based on gas sensing provided in an embodiment of the present invention uses a neural network model and a SWMM model to perform simulation and prediction based on the detection results of the odor gas concentration in the drainage network, extracts the temporal and spatial characteristics of the odor gas concentration in the drainage network, and then accurately predicts the odor gas concentration in the drainage network, providing a data basis for controlling the odor gas concentration in the drainage network.

[0122] In an optional embodiment, the cloud application platform 104 is also used to send the drainage network odor warning information to the RFID tag reader / writer 102 or the operation and maintenance personnel's handheld device for display, so as to control the odor gas in the drainage network.

[0123] Specifically, the prediction results of the odor gas concentration in the drainage network are displayed and analyzed on the GIS system, and the odor warning information of the drainage network is released in a timely manner. The odor warning information of the drainage network is sent to the RFID tag reader 102 or the handheld device of the operation and maintenance personnel to take corresponding control measures; among them, the handheld devices of the operation and maintenance personnel include: smart phones, laptops and tablets.

[0124] The drainage network odor gas monitoring system based on gas sensing provided in an embodiment of the present invention sends the drainage network odor warning information to the RFID tag reader / writer 102 for display, so that staff can take corresponding control measures based on the odor warning information, so that the odor gas concentration in the drainage network can be maintained within a relatively safe range.

[0125] The following is an example to illustrate the working process of the drainage pipe network odor gas monitoring system based on gas sensing.

[0126] Example 1:

[0127] The drainage network odor gas monitoring system based on gas sensing has three application scenarios, including manual inspection, scheduled inspection by operation and maintenance vehicles, and online monitoring of road facilities. The working process of the drainage network odor gas monitoring system based on gas sensing includes:

[0128] When the RFID tag reading and writing device 102 moves near a tag, it emits a detection radio frequency signal. When the RFID electronic tag sensor 103 receives the detection radio frequency signal from the tag reading and writing device 102, the receiving antenna 1032 in the RFID electronic tag sensor 103 converts the electromagnetic energy into electrical energy, and transmits the electrical energy to the encoding unit 10341 and the sensing unit 10342 in the form of an induced current. When the induced current passes through the sensing unit 10342, the resistance and dielectric constant change due to the change in H2S gas concentration, generating a feedback signal. The induced current is fed back, and the feedback induced current is converted into a feedback radio frequency signal through the transmitting antenna 1033. The RFID tag reader 102 receives the feedback radio frequency signal sent by the transmitting antenna 1033, converts the feedback radio frequency signal into a feedback digital signal, and uploads it to the data background 101. After model analysis and fitting, it is converted into H2S concentration and sent back to the RFID tag reader 102. An alarm is issued according to a preset threshold value, and a text message is sent to the platform, the RFID tag reader 102 and the mobile phones of relevant operation and maintenance personnel, and the dosing device is controlled to add chemicals to the drainage pipe.

[0129] The beneficial effects of the above embodiment 1 include:

[0130] 1) A passive, chipless, high-frequency RFID electronic tag sensor made of H2S-sensitive materials can achieve wireless H2S monitoring without opening the municipal manhole cover for testing, avoiding the threat to the health and safety of workers when the concentration of malodorous gas is high; it also reduces the gas exchange caused by opening the manhole cover, which may affect the accuracy of gas concentration detection.

[0131] 2) Passive, chipless, high-frequency RFID electronic tag sensors are simple to manufacture, low in cost, and easy to install. They can be installed over a large area and do not require regular calibration maintenance and power supply replacement, making later maintenance convenient.

[0132] 3) By combining operation and maintenance vehicles with road facilities, dynamic monitoring of malodorous gases generated in the drainage network can be achieved. Timely feedback can be provided based on dynamic changes and relevant control measures can be taken to mitigate the impact of malodorous gases.

[0133] In this embodiment, a method for monitoring the concentration of malodorous gas in a drainage network is also provided, which is applied to a malodorous gas monitoring system for a drainage network based on gas sensing. Figure 6 As shown, including:

[0134] In step S601, the RFID electronic tag sensor receives a detection radio frequency signal sent by the RFID tag reader / writer, converts the detection radio frequency signal into an induced current, adjusts the spectrum characteristics of the induced current, obtains a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer.

[0135] In step S602, the RFID tag reading and writing device converts the feedback radio frequency signal into a feedback digital signal, and uploads the feedback digital signal to the data background.

[0136] In step S603, the data background processes the feedback digital signal to obtain the detection result of the odorous gas concentration in the drainage network, and sends the detection result of the odorous gas concentration in the drainage network to the RFID tag reader for display.

[0137] This embodiment of the present invention provides a method for monitoring the concentration of malodorous gases in a drainage network. Figure 1 The embodiment shown is a drainage pipe network odor gas monitoring system based on gas sensitive sensing, so the specific implementation of steps S601 to S603 can refer to the above Figure 1 The corresponding description of the illustrated embodiment will not be repeated here.

[0138] It is understood that the effects and beneficial effects of the method of this embodiment are similar to those of Figure 1 The functions and beneficial effects of a drainage pipe network odor gas monitoring system based on gas sensitive sensing in the illustrated embodiment correspond to each other and will not be described in detail here.

[0139] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of this application.

[0140] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0141] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0142] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0143] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0144] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0145] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A drainage pipe network odor gas monitoring system based on gas sensing, characterized in that: include: A data background, an RFID tag reading and writing device, and an RFID electronic tag sensor arranged on the target inspection well cover or well wall; wherein the RFID electronic tag sensor, the RFID tag reading and writing device, and the data background are sequentially connected by wireless; The RFID electronic tag sensor is used to receive the detection radio frequency signal sent by the RFID tag reader / writer, convert the detection radio frequency signal into an induced current, adjust the spectrum characteristics of the induced current, obtain a feedback radio frequency signal, and send the feedback radio frequency signal to the RFID tag reader / writer; The RFID tag reading and writing device is used to convert the feedback radio frequency signal into a feedback digital signal and upload the feedback digital signal to the data background; The data background is used to process the feedback digital signal, obtain the detection result of the odorous gas concentration in the drainage network, and send the detection result of the odorous gas concentration in the drainage network to the RFID tag reading and writing device for display.

2. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 1 is characterized in that: The RFID electronic tag sensor includes: a substrate, and a receiving antenna, a transmitting antenna, and a resonance module arranged on the substrate; the receiving antenna and the transmitting antenna are respectively connected to the RFID tag reader / writer, and the receiving antenna, the transmitting antenna, and the resonance module are connected in sequence; The receiving antenna is used to receive the detection radio frequency signal sent by the RFID tag reading and writing device, convert the detection radio frequency signal into an induced current, and send the induced current to the resonance module; The resonance module is used to encode the induced current, and adjust the spectrum characteristics of the encoded induced current using the characteristic variation of the gas-sensitive sensing material to obtain a feedback induced current, and send the feedback induced current to the transmitting antenna; The transmitting antenna is used to convert the feedback induced current into the feedback radio frequency signal and send the feedback radio frequency signal to the RFID tag reading and writing device.

3. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 2 is characterized in that: The resonance module includes: an encoding unit and a sensing unit; the encoding unit is connected to the receiving antenna, and the sensing unit is connected to the transmitting antenna; the encoding unit includes multiple resonant structures, and the sensing unit includes a gas sensitive material film and an electrode; The encoding unit is configured to adjust the amplitude and frequency of the induced current by utilizing the shape and number of the resonant structures to obtain an encoded induced current; The sensing unit is used to collect the resistance change and dielectric constant change caused by the combination of environmental variables and the gas-sensitive material film, and adjust the spectral characteristics of the encoded induced current based on the resistance change and the dielectric constant change to obtain a feedback induced current, and send the feedback induced current to the transmitting antenna.

4. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 1 is characterized in that: The RFID tag reading and writing device includes: a control unit, a reading and writing unit, and an antenna circuit; wherein the control unit is wirelessly connected to the data background, the antenna circuit is wirelessly connected to the RFID electronic tag sensor, and the control unit, the reading and writing unit, and the antenna circuit are connected in sequence; The read / write unit is configured to receive the detection digital signal sent by the control unit, convert the detection digital signal into a detection radio frequency signal, and send the detection radio frequency signal to the antenna circuit; The antenna circuit is used to send the detection radio frequency signal to the RFID electronic tag sensor, receive the feedback radio frequency signal sent by the RFID electronic tag sensor, and send the feedback radio frequency signal to the read-write unit; The read / write unit is further configured to convert the feedback radio frequency signal into a feedback digital signal, and to send the feedback digital signal to the data background in a wireless manner via the control unit.

5. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 1 is characterized in that: The data background is specifically used to process the feedback digital signal, and use a neural network model to perform sensor data simulation on the feedback digital signal after data processing to obtain the detection result of the odor gas concentration in the drainage network.

6. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 1 is characterized in that: The data background is also used to obtain sensor codes and partition and store the detection results of the odorous gas concentration of the drainage network according to the sensor codes.

7. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 1 is characterized in that: Also includes: The cloud application platform is connected to the data background and is used to analyze and predict the concentration of odorous gases in the drainage network, obtain the predicted result of the concentration of odorous gases in the drainage network, and compare the predicted result of the concentration of odorous gases in the drainage network with the preset threshold value to obtain odor warning information of the drainage network.

8. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 7 is characterized in that: The cloud application platform is specifically used to perform simulation prediction based on the detection results of the odorous gas concentration in the drainage network using a neural network model and a SWMM model to obtain the prediction results of the odorous gas concentration in the drainage network.

9. The drainage pipe network odor gas monitoring system based on gas sensing according to claim 8 is characterized in that: The cloud application platform is also used to send the drainage network odor warning information to the RFID tag reading and writing device or the operation and maintenance personnel's handheld device for display, so as to control the odor gas in the drainage network.

10. A method for monitoring the concentration of malodorous gases in a drainage network, characterized in that: The method applied to the drainage pipe network malodorous gas monitoring system based on gas sensing according to any one of claims 1 to 9 comprises: The RFID electronic tag sensor receives the detection radio frequency signal sent by the RFID tag reader / writer, converts the detection radio frequency signal into an induced current, adjusts the spectrum characteristics of the induced current, obtains a feedback radio frequency signal, and sends the feedback radio frequency signal to the RFID tag reader / writer; The RFID tag reading and writing device converts the feedback radio frequency signal into a feedback digital signal, and uploads the feedback digital signal to the data background; The data background processes the feedback digital signal to obtain the detection result of the odor gas concentration in the drainage network, and sends the detection result of the odor gas concentration in the drainage network to the RFID tag reading and writing device for display.

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