阅读说明：本技术 一种地震前兆观测用氯离子在线监测装置 (Chloride ion online monitoring device for earthquake precursor observation ) 是由 何镧 徐红梅 黄雷 刘佳琪 王成宇 于 2021-09-09 设计创作，主要内容包括：本发明属于地震监测技术领域,具体涉及一种地震前兆观测用氯离子在线监测装置,包括基架和安装于基架的控制柜、驱动机构,还包括氯离子传感器和中央控制器,中央控制器安装于控制柜内,中央控制器与驱动机构、氯离子传感器通信连接；驱动机构用于驱动氯离子传感器作升降运动；当氯离子传感器下降至地下水中,以监测地下水中的氯离子浓度。本发明通过驱动机构定时驱动氯离子传感器下降至地下水中,实现地下水氯离子的定时测量,避免氯离子传感器长期浸泡在温度过高的地下水中,进一步延长了氯离子传感器的使用寿命；实现在线无损采样,不受人工和管路采样的影响,达到实时监测的目的。(The invention belongs to the technical field of earthquake monitoring, and particularly relates to an online chloride ion monitoring device for earthquake precursor observation, which comprises a base frame, a control cabinet and a driving mechanism, wherein the control cabinet and the driving mechanism are arranged on the base frame; the driving mechanism is used for driving the chloride ion sensor to do lifting motion; when the chloride ion sensor is lowered into the groundwater, the chloride ion concentration in the groundwater is monitored. The chlorine ion sensor is driven by the driving mechanism to descend into the underground water at regular time, so that the chlorine ion of the underground water is measured at regular time, the chlorine ion sensor is prevented from being soaked in the underground water with overhigh temperature for a long time, and the service life of the chlorine ion sensor is further prolonged; the online lossless sampling is realized, the influence of manpower and pipeline sampling is avoided, and the purpose of real-time monitoring is achieved.)

1. The chloride ion online monitoring device for earthquake precursor observation is characterized by comprising a base frame, a control cabinet and a driving mechanism, wherein the control cabinet and the driving mechanism are arranged on the base frame; the driving mechanism is used for driving the chloride ion sensor to do lifting motion; when the chloride ion sensor is lowered into the groundwater, the chloride ion concentration in the groundwater is monitored.

2. The online chloride ion monitoring device for earthquake precursor observation according to claim 1, wherein the driving mechanism comprises a telescopic bracket, a pulley, a cable disc and a communication cable, the pulley and the cable disc are respectively installed at two ends of the telescopic bracket along the telescopic direction, the cable disc comprises a disc body, a stepping motor and a reel, the stepping motor and the reel are installed on the disc body, the disc body is fixedly installed on the telescopic bracket, the reel is in rotating fit with the disc body, the stepping motor is used for driving the reel to rotate, and the stepping motor is in communication connection with the central controller; one end of the communication cable is wound on the reel and connected with the central controller, and the other end of the communication cable is wound around the pulley to be connected with the chlorine ion sensor.

3. The on-line monitoring device for the chloride ions for the observation of the earthquake precursor as recited in claim 2, wherein the pulse digital signal of the stepping motor is controlled and input by a timer interrupt mode.

4. The on-line monitoring device for the chloride ions used for observing the earthquake precursor as claimed in claim 2, wherein the telescopic bracket is a hollow structure, and the communication cable is routed along the inside of the telescopic bracket.

5. The on-line chloride ion monitoring device for earthquake precursor observation according to claim 1, further comprising a distance measuring sensor for measuring the distance from the chloride ion sensor to the underground water surface; the distance measuring sensor is in communication connection with the central controller.

6. The on-line chloride ion monitoring device for earthquake precursor observation according to claim 1, further comprising a wireless communication module in communication connection with the central controller for wirelessly transmitting on-line chloride ion monitoring information.

7. The on-line chloride ion monitoring device for earthquake precursor observation according to any one of claims 1 to 6, further comprising a power supply module for supplying power to each power utilization component.

8. The online chloride ion monitoring device for earthquake precursor observation according to claim 7, wherein the power supply module comprises a solar photovoltaic panel and a solar controller, the solar photovoltaic panel is mounted on the top of the base frame through a photovoltaic bracket, the solar controller is mounted on the control cabinet, the solar photovoltaic panel is in communication connection with the solar controller, and the solar controller is in communication connection with the central controller.

9. The online chloride ion monitoring device for earthquake precursor observation according to claim 8, wherein the power supply module further comprises a lithium battery, and the lithium battery is mounted on the control cabinet; the solar photovoltaic panel is electrically connected with the lithium battery, and the lithium battery is electrically connected with the central controller.

10. The on-line monitoring device for the chloride ion for the earthquake precursor observation according to any one of claims 1 to 6, wherein the chloride ion sensor comprises an insulating substrate, and a working electrode, a reference electrode and an auxiliary electrode which are arranged on the insulating substrate.

Technical Field

The invention belongs to the technical field of earthquake monitoring, and particularly relates to an online chloride ion monitoring device for earthquake precursor observation.

Background

The earthquake is a great earthquake motion caused by an emergency inside the earth crust, the pore or crystal defects of rocks inside the earth are filled with fluid, and deep fluid plays an important role in the earthquake inoculation process, so that the earthquake prediction can be effectively realized by monitoring underground fluid, the earthquake information is timely alarmed, more time is provided for people to refuge, and the negative influence brought by the earthquake is reduced.

The underground fluid is mainly water, gas, oil and the like flowing in the pores of the stratum, and chloride ions are ions which are most widely distributed in the underground water and exist in almost all the underground water. Monitoring the dynamic change of chloride ions in the underground water is helpful for monitoring and forecasting earthquake precursors.

At present, underground water chloride ion detection mainly adopts manual sampling or long pipeline transportation to send a sample to be detected to a detection pool for measurement. Manual sampling is discontinuous and is greatly influenced by manual experience; the long-distance pipeline transportation is easily affected by pipeline adsorption and pipeline pollution, so that the detected sample is not the original quantity or component, and the real-time dynamic change of the chloride ions in the underground water cannot be objectively and completely reflected, and the accuracy of earthquake precursor prediction is affected.

The sensor of the traditional chloride ion online monitor is soaked in underground water for a long time for measurement, the temperature of the underground water at a hot spring monitoring point is usually higher, and the service life of the traditional online chloride ion sensor is also challenged. In addition, earthquake precursor monitoring points are mostly located in remote areas, no commercial power is supplied, and certain difficulty is brought to online monitoring of chloride ions.

Therefore, there is a need in the art to develop an online chloride ion monitoring device with online nondestructive sampling, high temperature resistance and low power consumption.

Disclosure of Invention

Based on the above-mentioned shortcomings and drawbacks of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide an on-line monitoring device for earthquake precursor observation, which satisfies one or more of the above-mentioned requirements.

In order to achieve the purpose, the invention adopts the following technical scheme:

an online chloride ion monitoring device for earthquake precursor observation comprises a base frame, a control cabinet and a driving mechanism, wherein the control cabinet and the driving mechanism are installed on the base frame; the driving mechanism is used for driving the chloride ion sensor to do lifting motion; when the chloride ion sensor is lowered into the groundwater, the chloride ion concentration in the groundwater is monitored.

As a preferred scheme, the driving mechanism comprises a telescopic support, a pulley, a cable tray and a communication cable, wherein the pulley and the cable tray are respectively installed at two ends of the telescopic support along the telescopic direction, the cable tray comprises a tray body, a stepping motor and a reel, the stepping motor and the reel are installed on the tray body, the tray body is fixedly installed on the telescopic support, the reel is in rotating fit with the tray body, the stepping motor is used for driving the reel to rotate, and the stepping motor is in communication connection with the central controller; one end of the communication cable is wound on the reel and connected with the central controller, and the other end of the communication cable is wound around the pulley to be connected with the chlorine ion sensor.

Preferably, the pulse digital signal of the stepping motor is controlled and input by a timer interrupt mode.

Preferably, the telescopic bracket is of a hollow structure, and the communication cable is routed along the inside of the telescopic bracket.

As the preferred scheme, the online chloride ion monitoring device for seismic precursor observation also comprises a distance measuring sensor for measuring the distance from the chloride ion sensor to the underground water surface; the distance measuring sensor is in communication connection with the central controller.

As a preferred scheme, the chloride ion online monitoring device for earthquake precursor observation further comprises a wireless communication module which is in communication connection with the central controller and is used for wirelessly transmitting chloride ion online monitoring information.

Preferably, the chloride ion online monitoring device for earthquake precursor observation further comprises a power supply module for supplying power to each power utilization component.

According to a preferable scheme, the power supply module comprises a solar photovoltaic panel and a solar controller, the solar photovoltaic panel is installed at the top of the base frame through a photovoltaic support, the solar controller is installed in the control cabinet, the solar photovoltaic panel is in communication connection with the solar controller, and the solar controller is in communication connection with the central controller.

As a preferred scheme, the power supply module further comprises a lithium battery, and the lithium battery is arranged in the control cabinet; the solar photovoltaic panel is electrically connected with the lithium battery, and the lithium battery is electrically connected with the central controller.

Preferably, the chloride ion sensor comprises an insulating substrate, and a working electrode, a reference electrode and an auxiliary electrode which are arranged on the insulating substrate.

Compared with the prior art, the invention has the beneficial effects that:

(1)

the chlorine ion sensor is driven by the driving mechanism to descend into the underground water at regular time, so that the chlorine ion of the underground water is measured at regular time, the chlorine ion sensor is prevented from being soaked in the underground water with overhigh temperature for a long time, and the service life of the chlorine ion sensor is further prolonged; the online lossless sampling is realized, the influence of manpower and pipeline sampling is avoided, and the purpose of real-time monitoring is achieved.

(2) The invention can supply power by new energy such as solar energy or wind energy, and solves the problem that earthquake precursor monitoring points are mostly in remote areas and have no commercial power supply.

(3) The invention has wireless data transmission function, can remotely inquire monitoring results in real time and is suitable for field unattended continuous observation of earthquake precursors.

Drawings

FIG. 1 is a schematic structural diagram of an on-line chloride ion monitoring device for seismic precursor observation in embodiment 1 of the present invention;

FIG. 2 is a communication architecture diagram of an on-line chloride ion monitoring device for seismic precursor observation in embodiment 1 of the present invention;

FIG. 3 is a schematic structural view of a chloride ion sensor according to example 1 of the present invention;

FIG. 4 is a sectional view of a working electrode of example 1 of the present invention;

FIG. 5 is an exploded view of the structure of a working electrode of example 1 of the present invention;

FIG. 6 is a sectional view of a reference electrode in example 1 of the present invention;

FIG. 7 is a sectional view of an auxiliary electrode in example 1 of the present invention;

fig. 8 is a schematic structural view of a reticle according to embodiment 1 of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.

Example 1:

as shown in fig. 1 and 2, the chloride ion online monitoring device for earthquake precursor observation of the embodiment includes a base frame, a control cabinet 100, a driving mechanism, a central controller 200, a chloride ion sensor 300, a distance measuring sensor 400, a wireless communication module and a power supply module.

Specifically, the bed frame includes pole setting a, pole socket b and base c, and pole setting a chooses the galvanized pole of diameter 40 ~ 80mm for use, and pole socket b passes through the nut to be fixed on base c, and the nut surface is coated with the cement, prevents that the nut from being corroded. The upright rod a is of a hollow structure, so that a cable is conveniently wrapped, and the cable is not exposed.

The control cabinet 100 is installed at the upper portion of the upright a for mounting electrical components.

The central controller 200 is installed in the control cabinet 100, and the central controller 200 is in communication connection with the driving mechanism and the chloride ion sensor 300; the driving mechanism is used for driving the chloride ion sensor to do lifting motion; when the chloride ion sensor is lowered into the groundwater, the chloride ion concentration in the groundwater is monitored.

Specifically, actuating mechanism includes telescopic bracket 50, pulley 60, cable dish 70 and communication cable 80, and telescopic bracket fixed mounting is in the middle part of pole setting a, and telescopic bracket 50 transversely extends, can follow the length of transversely flexible adjustment telescopic bracket 50, and the length of telescopic bracket is adjusted to the distance of specific groundwater and pole setting. The telescopic bracket 50 is made of hollow aluminum alloy tubes, and wiring of the communication cable 80 is facilitated inside the telescopic bracket.

The left end and the right end of the telescopic support 50 in the telescopic direction are respectively provided with a cable disc 70 and a pulley 60, the cable disc 70 comprises a disc body, a stepping motor 9 and a scroll, the stepping motor 9 and the scroll are arranged on the disc body, the disc body is fixedly arranged on the telescopic support, the scroll is in rotating fit with the disc body, the stepping motor 9 is used for driving the scroll to rotate, and the stepping motor 9 is in communication connection with the central controller 1 through a cable; one end of the communication cable 80 is wound around the reel and connected to the central controller 1, and the other end is passed around the pulley 60 and connected to the chlorine ion sensor 300. Wherein the tray body has a telecommunication cable outlet for the telecommunication cable to enter the control cabinet 100. The pulse digital signal of the stepping motor is controlled and input by a timer interrupt mode, so that the stepping motor is driven to move at regular time, the chloride ion sensor 300 is vertically lowered into underground water every 10 min-2 h to measure the concentration of chloride ions, and autonomous real-time monitoring is realized.

The communication cable 80 of this embodiment adopts belted steel wire rope PVC cable, and communication stability is high, and intensity is high.

The distance measuring sensor 400 of the present embodiment is used for measuring the distance from the chloride ion sensor to the underground water surface; the distance measuring sensor is in communication connection with the central controller. Specifically, the distance measuring sensor 400 is installed outside the top end of the chloride ion sensor 300, measures the distance from the chloride ion sensor to the surface of the ground water, and transmits the measurement signal to the central controller.

The wireless communication module of the embodiment is in communication connection with the central controller and is used for wirelessly transmitting chloride ion online monitoring information. Specifically, the wireless communication module is installed in the control cabinet, and its antenna 10 is installed on the top of control cabinet 100 for transmit the chloride ion concentration of chloride ion sensor monitoring to the internet high in the clouds, realize the cloud storage and the cloud inquiry of data.

The power supply module of the present embodiment is configured to supply power to each power consuming component. Specifically, power module includes solar photovoltaic board 11, solar control ware 12 and lithium cell 13, and solar photovoltaic board 11 passes through the photovoltaic support mounting at the top of stand a, and solar control ware 12 and lithium cell 13 are installed in the switch board, and solar photovoltaic board 11 passes through the cable and is connected with solar control ware 12, lithium cell 13, and solar control ware 12, lithium cell 13 pass through the cable with central controller 200 and are connected. The cable connecting circuits adopt lightning protection circuits, and a large amount of capacity generated by accumulation on the circuits can be released to the ground in the shortest time, so that the electric components are prevented from being burnt due to overlarge current.

This embodiment adopts 11 and the 13 double power supplies of lithium cell of solar photovoltaic board to supply power to the device, and the solar photovoltaic board charges the lithium cell when supplying power to the device daytime, and night or cloudy day then use the lithium cell to supply power to the device.

The central controller and the solar controller adopt a MSP430 microprocessor with low power consumption, the whole device can be powered by a lithium battery for a long time under the condition that no solar photovoltaic panel is used for supplying power, the normal operation of the device is ensured, and the chloride ion concentration in underground water is monitored in real time all day.

As shown in fig. 3 to 7, the chloride ion sensor of the present embodiment includes an insulating substrate 7, and a reference electrode 1, a working electrode 2, an auxiliary electrode 3 and electrode pads 5 corresponding to the respective electrodes, which are located on the insulating substrate 7, wherein the working electrode 2 is located between the reference electrode 1 and the auxiliary electrode 3.

The insulating substrate 7 of the present embodiment is a rigid silicon wafer, i.e., an insulating silicon substrate.

The working electrode 2, the reference electrode 1 and the auxiliary electrode 3 are respectively connected with the corresponding electrode welding points 5 through electrode leads 4, the electrode leads are mutually independent, and insulating layers 6 are covered on the electrode leads; specifically, silicon rubber is applied to the surface of the electrode lead as an insulating layer 6 to protect the electrode lead.

Each electrode pad 5 is used for connecting an external control circuit to output an electrode change signal.

The working electrode 2 of the present embodiment includes a first conductive layer 2-1 and a reaction layer 2-2 sequentially stacked on an insulating substrate 7. Specifically, the first conducting layer 2-1 is an interdigital electrode and is prepared through a photoetching process, the interdigital electrode array pattern comprises a pair of sparse microelectrodes, each sparse microelectrode is provided with 3-10 fingers, and dozens of fingers on the two sparse microelectrodes are arranged in a crossed mode to form the interdigital electrode; the fingers are 3-8 mm long and 5 μm wide, the distance between every two adjacent fingers is 5 μm, and the interdigital strips with micro-distance can play a role in amplifying detection signals and further improve the detection sensitivity and precision of the sensor. Adopting electron beam evaporation vacuum coating to evaporate a conductive Cu film on an insulating substrate, wherein the thickness of the conductive Cu film is 50 nm-1 mu m;

the reaction layer 2-2 comprises a conductive nanofiber membrane layer 2-2A, Ag thin film layer 2-2B and an AgCl thin film layer 2-2C which are sequentially stacked on the first conductive layer 2-1. Specifically, the reaction layer is used for preparing a conductive nanofiber film on the first conductive layer by adopting an electrostatic spinning method, and then a metal Ag layer and an AgCl layer are sequentially deposited on the conductive nanofiber. The conductive nanofiber has the characteristics of high porosity, large specific surface area and uniform structure, and can improve the bearing capacity of a substance to be detected, thereby greatly increasing the electrochemical activity point position of the sensor, realizing the accelerated transmission and amplification of the nanofiber to an electric signal, improving the sensitivity of the sensor to chloride ion detection, shortening the detection time and improving the performance of the sensor.

The conductive nanofiber membrane layer 2-2A is prepared by taking polyvinylidene fluoride polymer as a spinning precursor, adding a conductive active material and a coupling agent, and performing electrostatic spinning.

The polyvinylidene fluoride polymer has excellent chemical stability such as corrosion resistance, high temperature resistance, oxidation resistance, ultraviolet ray resistance and the like, so that the chemical stability of the chloride ion sensor is improved, and the service life of the chloride ion sensor is prolonged.

The conductive active material comprises one or more of doped metal nanoparticles, fullerenes, graphene, carbon nanotubes. The conductive active material is added to improve the electron transfer performance of the material. The carbon nano tube doped in the nano fiber is taken as an example for illustration, the carbon nano tube has the advantages of excellent mechanical property, high mechanical strength, high conductivity, high electrochemical stability and the like, and the effective electric signal generated by the chloride ion reaction layer is improved. In addition, the carbon nano tube has good chemical stability, is beneficial to reducing signal fluctuation caused by complex components in the solution to be detected, reduces the interference of irrelevant substances, and improves the repeatability and stability of chloride ion detection.

The coupling agent may be one or more of aminopropyltriethoxysilane (KH550), glycidoxypropyltrimethoxysilane (KH560), methacryloxypropyltrimethoxysilane (KH570), vinyltriethoxysilane (A151), vinyltriethoxysilane (A171), mercaptopropyltrimethoxysilane (KH580, KH590), ethylenediamine propyltriethoxysilane (KH792), ethylenediamine propylmethyldimethoxysilane (KBM602), and the like. The addition of the coupling agent increases the binding force between the fiber film and the electrode, prevents the film from falling off, and prolongs the service life of the sensor.

The film thickness of the conductive nanofiber film layer is 100 nm-5 mu m, the film thickness of the Ag film layer is 200 nm-5 mu m, and the film thickness of the AgCl film layer is 500 nm-10 mu m.

The reference electrode 1 of the embodiment comprises a second conducting layer 1-1, an Ag thin film layer 1-2, an AgCl thin film layer 1-3 and a hydrogel layer 1-4 which are sequentially stacked on an insulating substrate 7, wherein the second conducting layer 1-1 is a conducting Cu film evaporated on the insulating substrate by adopting electron beam evaporation vacuum coating, and the film thickness is 50 nm-1 mu m; the thickness of the Ag film layer 1-2 is 200 nm-5 μm; the film thickness of the AgCl thin film layer 1-3 is 500 nm-10 mu m; the thickness of the hydrogel layer 1-4 is 0.5-1 μm. Specifically, the reference electrode is formed by depositing a conductive Cu film on an insulating substrate, then depositing an Ag film on the conductive Cu film, then depositing an AgCl film layer on the Ag film layer, and finally coating a hydrogel layer on the AgCl film layer.

Wherein the hydrogel layer comprises the following components: 2-hydroxyethyl methacrylate, polyvinylpyrrolidone, 2-dimethoxy-2-phenylacetophenone, ethylene glycol dimethacrylate and potassium chloride, wherein the weight ratio of each component is 10: 1: 0.4: 0.05: 2.75.

the auxiliary electrode 3 of the embodiment comprises a third conducting layer 3-1 and a Pt thin film layer 3-2 which are sequentially stacked on an insulating substrate 7, wherein the third conducting layer 3-1 is a conducting Cu film evaporated on the insulating substrate 7 by adopting an electron beam evaporation vacuum coating, and the film thickness is 50 nm-1 μm; the film thickness of the Pt thin film layer is 200 nm-10 mu m. Specifically, the auxiliary electrode is formed by depositing a conductive Cu film on an insulating substrate and then depositing a stable Pt film on the conductive Cu film.

The preparation process of the chloride ion sensor of the embodiment is as follows:

(1) putting the insulating silicon substrate into an ultrasonic cleaning machine, cleaning the insulating silicon substrate with hydrogen peroxide, acetone and absolute ethyl alcohol in sequence, and drying. In vacuum equipment, the insulating silicon substrate is heated to 300 ℃ and the vacuum degree reaches 10^-5And Pa or above, evaporating a 50 nm-1 μm Cu film on the insulating silicon substrate, and photoetching the Cu film in a photoetching machine according to a designed mask (shown in figure 8) to obtain each conducting layer.

The interdigital electrode array pattern of the working electrode comprises a pair of sparse microelectrodes, each sparse microelectrode is provided with 3-10 fingers, and the 3-10 fingers on the two sparse microelectrodes are arranged in a crossed mode to form the interdigital electrode; the fingers are 3-8 mm long and 5 μm wide, and the distance between adjacent fingers is 5 μm.

(2) Preparing a layer of conductive nanofiber on the interdigital electrode by adopting an electrostatic spinning method: weighing 2g of polyvinylidene fluoride, dissolving the polyvinylidene fluoride in 25mL of acetone, stirring and dissolving, then adding 0.3g of carbon nano tube and 0.1g of aminopropyltriethoxysilane (KH550), and stirring to obtain a uniform and stable polyvinyl alcohol electrospinning precursor solution; injecting a proper amount of precursor solution into the injector, using a stainless steel needle head as a spinning nozzle, setting the electrostatic high-voltage direct current at 18 KV-25 KV, propelling the precursor solution at the speed of 1 mL/h-2.5 mL/h, and setting the spinning time to be 5-25 s. Under the action of an electric field, the polyvinyl alcohol electrospinning precursor solution forms a conductive composite fiber film with a high specific surface area of 100 nm-5 mu m and high porosity on the interdigital electrode.

(3) Putting the fiber film substrate into a vacuum coating chamber again for secondary electron beam evaporation vacuum coating, and respectively evaporating a layer of Ag film on the film fibers of the reference electrode and the working electrode in a plating way, wherein the thickness of the plating layer is 200 nm-5 mu m; then evaporating and plating an AgCl film layer, wherein the thickness of the plating layer is 500 nm-10 mu m; a layer of Pt film is vapor-plated on the auxiliary electrode, and the thickness of the plating layer is 200 nm-10 mu m; the coating mode is the same as that of evaporation of a Cu film.

(4) The outer surface of the reference electrode is coated with a layer of hydrogel. The hydrogel was prepared from 2-hydroxyethyl methacrylate: polyvinylpyrrolidone: 2, 2-dimethoxy-2-phenylacetophenone (DMPAP): ethylene glycol dimethacrylate and potassium chloride as 10: 1: 0.4: 0.05: 2.75 mass ratio for make-up coating.

(5) The silicon rubber is applied to the surface of the electrode lead as an insulating layer to prevent the electrode lead from being protected.

The working electrode of the chloride ion sensor is an Ag/AgCl chloride ion selective electrode, chloride ions and silver chloride in the solution to be detected form a dynamic balance, and when the concentration of the chloride ions in the solution changes, the potential of the Ag/AgCl electrode changes; the potential of the reference electrode is stable and unchangeable in the solution to be measured, and the chloride ion concentration can be obtained by combining the energy Stokes equation; the auxiliary electrode and the working electrode form a loop to keep the current smooth and stable so as to ensure that all reactions occur on the working electrode and the measurement is more accurate.

The working flow of the chloride ion online monitoring device for seismic precursor observation of the embodiment is as follows:

the input of a pulse digital signal is controlled in a timer interrupt mode, and a stepping motor is driven at regular time to control the forward and reverse rotation of the scroll so as to realize the regular measurement of the concentration of the chloride ions;

when the measurement is needed, the stepping motor controls the reel to rotate forwards, so that the chloride ion sensor descends to a position 10cm under water, and the chloride ion sensor is started to detect and measure the concentration of chloride ions in underground water; the concentration result is transmitted to the central controller through a communication cable, converted by the central controller and transmitted to the cloud end through the wireless communication module, and cloud storage and cloud query are achieved;

after the measurement is finished, the stepping motor controls the reel to rotate reversely, so that the chlorine ion sensor rises to a height of 0.5 m from the water surface, and the next measurement is waited;

when the groundwater level rises, the distance measuring sensor measures that the distance from the chloride ion sensor to the water surface is smaller than a certain distance, signals are transmitted to the central controller, the central controller sends out signals to enable the stepping motor to rotate reversely to enable the chloride ion sensor to rise to a certain distance from the water surface, the chloride ion sensor is prevented from being soaked in water in a long-term non-working state, and the service life is prolonged.

Example 2:

the difference between the online chloride ion monitoring device for seismic precursor observation of the embodiment and the embodiment 1 is that:

lithium batteries or solar energy or wind energy are adopted for power supply, namely a single power supply mode is adopted, so that the requirements of different applications are met;

other structures can refer to embodiment 1.

The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.