Rod-type groundwater ion concentration change detection device and detection method

Abstract

The present invention discloses a plug-in type groundwater ion concentration change detection device and detection method, the detection device includes an electric measuring plug-in, a data box, a solar module and a host computer; an annular electrode for detecting groundwater resistivity is distributed on the electric measuring plug-in, and two adjacent annular electrodes form an electrode pair; the data box includes a lithium battery, a voltage regulator, a timing collector, a data collector, a data storage card, a DTU data transmitter, a signal antenna, an external port, an insulating cushion and a cover plate. During detection, the present invention inserts the electric measuring plug-in into different depths of groundwater, provides power current through the lithium battery and the voltage regulator, and uses the annular electrode electrically connected to the timing collector and the data collector to continuously and automatically collect data on the groundwater, and wirelessly transmits the collected data to the host computer through the DTU data transmitter and the signal antenna according to the communication protocol, and analyzes the changes in groundwater ion concentration at different depths according to the resistivity inversion method, thereby improving the test accuracy and work efficiency.

Description

Technical Field

[0001] The invention relates to a device and method for detecting changes in ion concentration of groundwater, and in particular to a rod-insertion type device and method for detecting changes in ion concentration of groundwater. Background Art

[0002] With the continuous acceleration of industrialization and urbanization, various pollution sources have emerged, and the resulting groundwater pollution problem has become increasingly serious. Specifically, human production activities have caused changes in the chemical composition, physical properties and biological characteristics of groundwater, which has led to a decline in groundwater quality, and further changed the ion concentration in groundwater. The change in groundwater ion concentration is different at different water levels and changes with time.

[0003] Since the resistivity of groundwater is related to the ion concentration of groundwater, detecting the resistivity of groundwater can effectively monitor the changes in ion concentration in groundwater, reduce the degree of groundwater pollution, and reduce the enrichment of groundwater ions, thereby ensuring the safety and quality of normal production and life of humans. However, how to effectively detect the changes in groundwater ion concentration is a technical problem that technicians urgently need to solve.

[0004] At present, when detecting the concentration of groundwater ions, it is necessary to send the water samples collected on site to relevant laboratories for professional detection of groundwater ion concentration. Due to the sampling, sample circulation, sample preservation and other links, the accuracy and efficiency of the later laboratory groundwater ion concentration test are greatly affected. In addition, this method consumes a lot of cost and time, and cannot effectively sample groundwater at different depths. It is also difficult to conduct relevant tests on all areas of groundwater, and the distribution of groundwater ions cannot be obtained. Secondly, when monitoring groundwater quality, the detection equipment used is large, suitable for fixed-point detection, inconvenient to carry, and cannot detect the ion concentration of deep groundwater. It also consumes a lot of human resources and costs. In addition, heavy metal substances in groundwater damage the detection components, which will cause errors in the detection results, resulting in inaccurate detection of ion concentrations at different depths, reducing the detection accuracy, and requiring more time and money. It is impossible to quickly and effectively determine the distribution range of ion concentrations.

[0005] For example, patent number CN 107091861 A discloses a device and method for measuring the resistivity of water at different depths underwater. The device has a simple structure and is easy to operate, with few components. However, the test data needs to be read and recorded, and the readings and records need to be repeated multiple times at the same depth. The test results have large errors and low accuracy. Wireless data transmission is also not possible, and the data processing efficiency is low.

[0006] With the digitization of traditional detection sensors, the rapid iterative development of Internet information technology, and the research and development of new materials, relevant technologies can be effectively transformed into automated detection devices, creating good conditions for detecting changes in groundwater ion concentration. However, how to make groundwater ion concentration detection automated and information-based while reducing labor costs and saving R&D funds and manufacturing costs is a technical problem that needs to be solved urgently. Summary of the invention

[0007] Purpose of the invention: The purpose of the present invention is to provide a plug-in type groundwater ion concentration change detection device and detection method. The present invention detects the resistivity of groundwater at different depths, and then effectively analyzes the changes in the ion concentration of groundwater, and reasonably monitors and warns the pollution degree and ion concentration of groundwater. It has strong practicality, high test accuracy, and simple operation. It can detect the ion concentration of groundwater at different depths and process, transmit and store data in a timely manner, thereby improving work efficiency.

[0008] Technical solution: The plug-in type groundwater ion concentration change detection device of the present invention comprises an electric measuring plug-in rod, a data box, a solar module and a host computer;

[0009] Ring electrodes for detecting groundwater resistivity are distributed on the electric measuring rod, and two adjacent ring electrodes form an electrode pair;

[0010] The data box includes a lithium battery, a voltage stabilizer, a timing collector, a data collector, a data storage card, a DTU data transmitter, a signal antenna, an external port, an insulating cushion and a cover plate; the voltage stabilizer is connected to the timing collector and the data collector, the data collector is connected to the data cable on the ring terminal, and one end of the data collector is connected to the DTU data transmitter and the signal antenna, and the other end of the data collector is connected to the external port through the data storage card;

[0011] The DTU data transmitter and signal antenna wirelessly transmit the collected data to the upper machine according to the communication protocol and store the data at the same time.

[0012] The electric measuring rod is provided with an annular terminal and a hole, and the wire of the annular electrode passes through the hole and is connected with the annular terminal.

[0013] The solar module includes a solar panel, a solar controller and a mechanical arm. The mechanical arm includes a rotating shaft and a knob. The mechanical arm controls the lifting and closing of the solar panel through the rotating shaft. The knob controls the rotation of the solar panel surface. The solar controller provides power for the lithium battery.

[0014] The external port is arranged on one side of the electric measuring rod, and the external port extends from the data box to the electric measuring rod.

[0015] The external port is provided with a data transmission port and a US port connected to the hardware, and the data transmission port and the US port are connected to the external hardware to facilitate the export of the data collected by the data collector.

[0016] The annular electrode is a carbon electrode, which has corrosion resistance and electrical conductivity, and its resistivity is known, so it has little effect on the resistivity test of groundwater and is durable.

[0017] The data signal frequency of the timing collector is the same as that of the data collector.

[0018] The signal antenna is a telescopic antenna.

[0019] The method for detecting changes in groundwater ion concentration of the present invention comprises the following steps:

[0020] (1) First, an electric measuring rod with a ring electrode is inserted into the groundwater, and a lithium battery and a voltage regulator are used to provide a stable power supply current;

[0021] (2) Collecting groundwater resistivity data through a timing collector and a ring electrode on an electrical measuring rod connected to a data collector and a data cable, and continuously collecting groundwater resistivity at different depths;

[0022] (3) The collected data is wirelessly transmitted to the host computer through the DTU data transmitter and the signal antenna according to the communication protocol, and the collected data is stored;

[0023] (4) The collected groundwater resistivity data were displayed and monitored in real time using Labview on the host computer, and the resistivity inversion method was used to analyze and determine the changes in ion concentration of groundwater at different depths.

[0024] In step (4), the resistivity inversion method is used to obtain the underground water electrical profile curve shape, and the change of groundwater ion concentration at different depths is obtained through the underground water electrical profile curve shape.

[0025] Working principle: The present invention utilizes the resistivity characteristics of water, wherein the resistivity of water reflects the amount of ions in water and is an important indicator of water purity. The higher the purity of water, the lower the ion concentration, the greater the resistivity of water, and the resistivity of water is affected by the purity of water, temperature and test environment. Therefore, when the ion concentration of groundwater changes, the resistivity of groundwater will also change.

[0026] Annular electrodes with equal intervals are arranged on the electrical measuring rod of the present invention, and two adjacent annular electrodes form an electrode pair. The annular electrode wires are connected to the annular wiring terminals in the reserved channels, and are connected to the data collector in the multifunctional data box through data cables. The data collector is powered by solar energy and lithium batteries, and continuously collects and stores groundwater resistivity data under the control of the timing collector. A wireless signal connection is established with a PC through a 5G DTU data transmitter under the action of a signal antenna, and then combined with the resistivity inversion method, the changes in ion concentration of groundwater at different depths are determined.

[0027] The specific process of the groundwater ion concentration change detection method of the present invention is to insert the electrical measuring rod into different depths of the groundwater, provide stable power supply current through the lithium battery and the voltage stabilizer, and use the annular electrode electrically connected to the timing collector and the data collector to continuously and automatically collect groundwater data. At the same time, the collected data is wirelessly transmitted to the upper machine PC through the 5G DTU data transmitter and the signal antenna according to the communication protocol, and the changes in groundwater ion concentration at different depths are analyzed based on the resistivity inversion method.

[0028] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0029] (1) The present invention detects the resistivity of contaminated groundwater as a reference for the ion concentration and spatial distribution of the contaminated groundwater, and combines the resistivity inversion method to analyze and interpret the detected contaminated groundwater data, thereby more accurately reflecting the ion concentration distribution of the contaminated groundwater and facilitating the evaluation of the engineering characteristics of the contaminated groundwater.

[0030] (2) The present invention uses annular electrodes to detect the resistivity of groundwater. Two adjacent annular electrodes form an electrode pair, and they are numbered one by one, thereby improving the test efficiency.

[0031] (3) The electric measuring rod of the present invention is made of polytetrafluoroethylene material, because polytetrafluoroethylene has good electrical insulation, corrosion resistance, chemical stability, is almost insoluble in all solvents, and has good mechanical toughness, and can be bent appropriately to avoid hard objects in groundwater. The annular electrode on the electric measuring rod is a carbon electrode, because it has excellent corrosion resistance and electrical conductivity, and the resistivity of the carbon electrode is a known and measurable material, which has little effect on the groundwater resistivity test, thereby improving the resistivity test accuracy.

[0032] (4) The present invention constructs a new detection device based on the existing resistivity test system, which improves the test accuracy and enables water pollution investigation to better serve environmental geotechnical engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a schematic diagram of the structure of the plug-in type groundwater ion concentration change detection device of the present invention;

[0034] Figure 2 is a schematic diagram of a multifunctional data box of the present invention;

[0035] Figure 3 It is the circuit diagram of the electric measuring element of the present invention;

[0036] Figure 4 is a schematic diagram of a ring terminal of the present invention;

[0037] Figure 5 is a schematic diagram of a solar powered mechanical arm of the present invention;

[0038] Figure 6 is a schematic diagram of an external port of the present invention;

[0039] Figure 7 It is a schematic diagram of the structure of the electric measuring rod of the present invention. DETAILED DESCRIPTION

[0040] like Figures 1 to 7 As shown, the plug-in type groundwater ion concentration change detection device of the present invention comprises an electric measuring plug-in rod 1, a multifunctional data box 2 and a host computer PC 4. The electric measuring plug-in rod 1 is provided with a plurality of annular electrodes 101, annular wiring terminals 103 and a reserved channel 102. The annular electrodes 101 are electrically connected to the wiring port 104 on the annular wiring terminal 103 through the reserved channel 102 by means of a wire 105.

[0041] The multifunctional data box 2 includes a lithium battery 201, a voltage stabilizer 202, a timing collector 203, a data collector 204, a data storage card 205, a 5G DTU data transmitter 206, a signal antenna 207, an external port 208, an insulating rubber pad 209 and a cover 210. The solar panel 3 is installed on the upper part of the multifunctional data box 2, and is lifted and rotated by the knob 3021 and the rotating shaft 3022 on the mechanical arm 302.

[0042] The annular electrodes 101 are embedded in the outer wall of the electric measuring rod 1 , and the annular electrodes 101 are arranged on the electric measuring rod 1 at equal intervals, and the annular electrodes 101 are numbered to detect the resistivity of groundwater at different depths.

[0043] Among them, the annular electrode 101 is connected to the wiring port 104 on the annular terminal 103 one by one using a wire 105 through a reserved channel 102, and two adjacent annular electrodes 101 form an electrode pair. The annular terminal 103 is electrically connected to the data collector 204 in the multifunctional data box 2 using a data cable 106.

[0044] The electrical measuring rod 1 is made of polytetrafluoroethylene material, which has good electrical insulation, corrosion resistance and durability, and has excellent chemical stability and toughness. The annular electrode 101 is a carbon electrode, which has excellent corrosion resistance and electrical conductivity, and its resistivity is known, which has little effect on the resistivity test of groundwater and has certain durability.

[0045] The neck of the electric measuring rod 1 is covered with an anti-skid sleeve 107, and the anti-skid sleeve 107 is provided with anti-skid patterns to facilitate the operation of the operator. The provision of the anti-skid sleeve 107 increases the friction between the hand and the electric measuring rod 1 and the comfort when holding.

[0046] The multifunctional data box 2 is installed on the upper part of the electric measuring rod 1, and is separated by an insulating rubber pad 209. A reserved channel 102 is opened between the insulating rubber pad 209 and the bottom of the multifunctional data box 2 to facilitate the electrical connection of the data cable 106 and the data collector 204. The multifunctional data box 2 is made of GFRP fiber reinforced plastic, which can be used for a long time, and the cover plate 210 under the solar panel 3 is used to protect the inside of the multifunctional data box 2.

[0047] like Figures 2 to 3 As shown, the power supply adopts solar module and lithium battery 201 to generate electricity, and the solar controller 301 charges the lithium battery 201, the lithium battery 201 is connected to the voltage stabilizer 202, the voltage stabilizer 202 is connected to the timing collector 203 and the data collector 204, the data collector 204 is connected to the data cable 106 on the ring terminal 103, and the data collector 204 is connected to the 5GDTU data transmitter 206, the 5G DTU data transmitter 206 is connected to the signal antenna 207, the data collector 204 is connected to the data storage card 205, and the data storage card 205 is connected to the external port 208; after the circuit connection is completed, the upper machine PC 4 transmits the data collected by the data collector 204 through the signal antenna 207 according to the communication protocol, and the signal antenna 207 is retractable.

[0048] The timing collector 203 sets the same data frequency signal as the data collector 204 and sets the data collection signal at a certain time interval, so that the data collector 204 can continuously and automatically collect data, and the data storage card stores the data collected by the data collector 204.

[0049] As a data acquisition device for detecting changes in ion concentration, the interfaces of each component are sealed with air-tight gaskets and high-grade waterproof glue, and rubber gaskets are provided at the openings to prevent the components in the multifunctional data box 2 from being damaged due to water ingress.

[0050] like Figure 6As shown, the external port 208 is connected to external hardware via the data transmission port 2081 and the US port 2082 , so as to facilitate exporting the data collected by the data collector 204 .

[0051] The external connection port 208 is disposed on one side of the electrical test rod 1 , and the external connection port 208 extends from the multifunctional data box 2 to the outer surface of the electrical test rod 1 .

[0052] After the 5G DTU data transmitter 206 is powered on, it uploads data instructions to the upper computer PC 4 through the signal antenna 207, establishes 5G DTU data transmission information and issues data collection instructions. After receiving the data collection instructions, the data collector 204 collects and transmits the detection data. The upper computer PC 4 server accepts the detection data uploaded by the 5G DTU data transmitter 206 according to the communication protocol, and processes and monitors the resistivity of groundwater through the network information platform of PC 4.

[0053] The host computer PC 4 is connected to the multifunctional data box 2 via wireless signals. The resistivity test system constructed by the virtual instrument LabVIEW program of the PC 4 is used to process the groundwater resistivity between different electrode pairs. The resistivity inversion method is then used to determine the changes in groundwater ion concentration at different depths, so as to monitor the data signal in real time and further analyze the distribution range of groundwater ion concentration.

[0054] The method for detecting the change of groundwater ion concentration of the present invention comprises the following steps:

[0055] (1) First, an electric measuring rod provided with an annular electrode 101 is inserted into groundwater, and a stable power supply current is provided by a lithium battery and a voltage regulator;

[0056] (2) Through the set timing collector, the resistivity data of groundwater is collected by using the annular electrode on the electric measuring rod connected to the data cable of the data collector, and the resistivity of groundwater at different depths is continuously collected;

[0057] (3) The collected data is wirelessly transmitted to the host computer PC 4 through the 5G DTU data transmitter 206 and the signal antenna 207 according to the communication protocol, and the collected data is stored at the same time;

[0058] (4) The collected groundwater resistivity data are displayed and monitored in real time using the virtual instrument LabVIEW program on the host computer 4, and the resistivity inversion method is used to analyze and determine the changes in the ion concentration of groundwater at different depths. The specific process is to use the Res series inversion software to perform inversion analysis on the groundwater resistivity data using the least squares method of the software. According to the groundwater resistivity data collected at different depths, the resistivity profile curve of the groundwater at different depths is generated. The changes in the ion concentration of groundwater at different depths can be seen through this profile curve, thereby better monitoring the changes in the ion concentration of groundwater.

[0059] In an embodiment of the present invention, the process for detecting the ion concentration of groundwater at different depths in an engineering project is as follows:

[0060] The electric measuring rod 1 is inserted vertically into the groundwater by using an external component, or a plurality of electric measuring rods are arranged in a matrix to form an electric measuring network. After the electric measuring rod is fixed, the electric signal data of groundwater ions at different depths are collected through the annular carbon electrodes arranged at equal distances on the electric measuring rod connected to the data collector, and the PC is started to establish a wireless signal connection with the multi-function data box to transmit the collected groundwater data. Then, the resistivity of the groundwater is processed based on the electrode pair formed by two adjacent annular electrodes and the resistivity test system of the PC. The Res series inversion software is used to obtain the groundwater electric measuring profile curve shape, and the ion concentration changes of the groundwater at different depths are obtained through this groundwater electric measuring profile curve shape for practical application in engineering.

Claims

1. A method for detecting changes in groundwater ion concentration, characterized in that: The detection is performed using a rod-type groundwater ion concentration change detection device, the rod-type groundwater ion concentration change detection device comprising an electric measuring rod (1), a data box (2), a solar module and a host computer (4); The electrical measurement rod (1) is provided with annular electrodes (101) for detecting the resistivity of groundwater, and two adjacent annular electrodes (101) form an electrode pair; The data box (2) comprises a lithium battery (201), a voltage stabilizer (202), a timing collector (203), a data collector (204), a data storage card (205), a DTU data transmitter (206), a signal antenna (207), an external port (208), an insulating cushion layer (209) and a cover plate (210); the voltage stabilizer (202) is connected to the timing collector (203) and the data collector (204); the data collector (204) is connected to a data cable (106) on a ring terminal (103); one end of the data collector (204) is connected to the DTU data transmitter (206) and the signal antenna (207); and the other end of the data collector (204) is connected to the external port (208) via the data storage card (205); The DTU data transmitter (206) and the signal antenna (207) wirelessly transmit the collected data to the upper station machine (4) according to the communication protocol, and store the data at the same time; The electrical measuring rod (1) is provided with an annular terminal (103) and a hole (102), and the wire (105) of the annular electrode (101) passes through the hole (102) and is connected to the annular terminal (103); The solar module comprises a solar panel (3), a solar controller (301) and a mechanical arm (302); the mechanical arm (302) comprises a rotating shaft (3022) and a knob (3021); the mechanical arm (302) controls the lifting and closing of the solar panel (3) via the rotating shaft (3022); the knob (3021) controls the rotation of the solar panel (3); and the solar controller (301) provides electrical energy for the lithium battery (201); The external port (208) is arranged on one side of the electrical test rod (1), and the external port (208) extends from the data box (2) to the electrical test rod (1); The detection method comprises the following steps: (1) firstly inserting an electric measuring rod (1) provided with an annular electrode (101) into groundwater, and providing a stable power supply current through a lithium battery (201) and a voltage regulator (202); (2) collecting resistivity data of groundwater through a timing collector (203) and a ring electrode (101) on an electrical measuring rod (1) connected to a data collector (204) and a data cable (106), and continuously collecting resistivity of groundwater at different depths; (3) wirelessly transmitting the collected data to the host computer (4) through the DTU data transmitter (206) and the signal antenna (207) according to the communication protocol, and storing the collected data; (4) The collected groundwater resistivity data is displayed and monitored in real time using Labview on the host computer (4), and the resistivity inversion method is used to analyze and determine the changes in ion concentration of groundwater at different depths. The process is as follows: the collected groundwater resistivity data results are used in the Res series inversion software, and the least squares method of the software is used to invert and analyze the groundwater resistivity data. The resistivity profile curve of groundwater at different depths is generated based on the groundwater resistivity data collected at different depths, and the changes in ion concentration of groundwater at different depths can be seen through the profile curve.

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