阅读说明：本技术 三维电阻率原位监测探针 (Three-dimensional resistivity in-situ monitoring probe ) 是由 付腾飞 郭磊 徐兴永 窦衍光 刘文全 于莹 于 2019-11-26 设计创作，主要内容包括：本发明提出一种三维电阻率原位监测探针,包括内置从机电路的探杆、位于探杆上端内置主机电路的主控舱及位于探杆下端的锥尖,所说探杆包括：多组电阻率传感器模块,每组电阻率传感器模块包括多个绝缘环、所述绝缘环顶部具有凸起结构,底端具有和凸起配合的凹槽结构,绝缘环顶面设有至少3个点电极凹槽及两个上下贯通孔用以插装绝缘环的定位柱,所述点电机凹槽位于所述绝缘环外边缘处。本发明可构建三维电阻率动态监测体系,通过三维电阻率动态监测体系可揭示不同灾害链起因导致水盐运移在特殊土体中的运移规律和机理,实现对海岸带地区水盐运移空间分布动态变化过程进行高(空间)分辨率、高精度的原位长期监测。(The invention provides a three-dimensional resistivity in-situ monitoring probe, which comprises a probe rod with a built-in slave circuit, a main control cabin with a built-in host circuit and a conical tip, wherein the main control cabin is positioned at the upper end of the probe rod, and the conical tip is positioned at the lower end of the probe rod, and the probe rod comprises: multiunit resistivity sensor module, every group resistivity sensor module include a plurality of insulating rings the insulating ring top have protruding structure, the bottom have with protruding complex groove structure, the insulating ring top surface be equipped with 3 at least point electrode recess and two about the perforating hole be used for cartridge insulating ring's reference column, some motor recess are located the outer edge of insulating ring. The method can construct a three-dimensional resistivity dynamic monitoring system, can reveal the migration rule and mechanism of water and salt migration in a special soil body caused by different disaster chain causes through the three-dimensional resistivity dynamic monitoring system, and realizes the in-situ long-term monitoring with high (spatial) resolution and high precision on the dynamic change process of water and salt migration space distribution in coastal zones.)

1. The utility model provides a three-dimensional resistivity in situ monitoring probe, includes probe rod, the main control cabin that is located the built-in host computer circuit in probe rod upper end and is located the awl point of probe rod lower extreme of built-in slave machine circuit, its characterized in that: the probe rod comprises a plurality of groups of resistivity sensor modules, each group of resistivity sensor modules comprises a plurality of insulating rings, the tops of the insulating rings are provided with protruding structures, the bottoms of the insulating rings are provided with groove structures matched with the protrusions, the top surfaces of the insulating rings are provided with at least 3 point electrode grooves and two positioning columns with upper and lower through holes for inserting the insulating rings, and the point motor grooves are located at the outer edges of the insulating rings;

the top end of the conical tip connector is provided with two limiting columns for assembling the resistivity sensor module;

the cabin connector is provided with a wiring end matched with the main cabin;

during installation, each group of resistivity sensor modules are sequentially sleeved on the two limiting columns, the top ends of the resistivity sensor modules are connected with the main cabin through the cabin connector, and the bottom ends of the resistivity sensor modules are connected with the cone tips.

2. The three-dimensional resistivity in-situ monitoring probe of claim 1, wherein: the protrusion is an annular protrusion.

3. The three-dimensional resistivity in-situ monitoring probe of claim 1, wherein: the insulating ring thickness is 5 mm.

4. The three-dimensional resistivity in-situ monitoring probe of claim 1, wherein: the number of the motor grooves is 4.

5. The three-dimensional resistivity in-situ monitoring probe of claim 1, wherein: the insulating ring is made of nylon.

6. The three-dimensional resistivity in-situ monitoring probe of claim 1, wherein: the point electrode grooves are symmetrically distributed.

Technical Field

The invention belongs to the technical field of geological detection, and particularly relates to a circuit rate in-situ monitoring probe.

Background

The resistivity probe is a resistivity sensor for continuous measurement, the traditional resistivity sensor is different from two electrodes to eight electrodes, the adopted measurement modes are different, but the traditional resistivity sensor is basically a single-point measurement device, and a method for performing electrical measurement on a measured medium and inverting the characteristics of the measured medium by adopting a mode of arranging point electrodes or annular parallel arrangement and through manual electric field excitation is adopted. In terms of measurement principle, resistivity sensors are classified into an induction type, an electrode type, and an ultrasonic wave type (zhou mingjun et al, 2010).

The electrode type resistivity sensor adopts an electrochemical method to measure according to the electrolytic conduction principle; the inductive conductivity sensor realizes the measurement of the liquid conductivity according to the electromagnetic induction principle; the ultrasonic conductivity sensor measures the conductivity according to the change of ultrasonic waves in liquid. Among them, the electrode type resistivity sensor is most widely used.

Won (1987) developed a resistivity measurement system assembled from four rings in a Wenner arrangement and used to make seafloor sediment resistivity measurements. Fossa (1998) developed a set of resistivity measuring devices based on ring electrodes and plate electrodes and applied them to measure gas-liquid mixtures. The Rosenberger (1999) design developed a free-fall penetrating resistivity probe that was later used to continuously measure sediment resistivity in a depth range of 4 meters below the sea floor and to establish a correspondence between resistivity and sediment porosity change (Jansen et al, 2005). At present, the electrode type resistivity sensor is widely applied to the aspects of measuring seawater salinity, sediment electrical property and the like in the field of ocean exploration, and a large number of scientific research achievements and marketized products are successively made. However, with the requirement of real space detection, the resistivity sensor of four electrical levels cannot meet the requirement of high-resolution monitoring.

The high-density resistivity method is a method for quickly measuring a large number of measuring points in one or more measuring modes by adopting a large number of electrodes which are pre-distributed along a certain rule and quickly switching channels through an electrode switching control circuit. The high-density resistivity probe adopts a high-density resistivity method, annular electrodes are arranged at equal intervals along the axial direction of the rod body, and the dense measurement of a large number of measuring points is realized through an electrode conversion circuit and an acquisition system. The measurement principle of the high-density resistivity probe is similar to that of the traditional electrical method, but the space density of data is tens of times or more than that of the traditional electrical method, and the high-resolution space data can be directly obtained and used for inverting the space composition among different measured media or different components of the same medium.

Ridd (1992) modified the WON design of the device to include 1 pair of current electrodes (emitter electrodes) and 6 pairs of voltage electrodes (measurement electrodes) and used the device to perform a seabed erosion process monitoring experiment. Thomas (2002) optimized and improved the device designed by Ridd, simplified the in-situ measurement mode, and integrated the data acquisition part and the probe. Cassen (2004) solves a series of technical problems on the basis of the Ridd equipment, designs a set of resistance probe consisting of 32 groups of point electrodes, and can carry out continuous rolling measurement.

The current technical development always aims at improving the monitoring resolution to meet the specific fine detection requirement, but the current monitoring probe is still limited to large-scale detection in one-dimensional and two-dimensional space, the two-dimensional detection can only obtain the resistivity value of a certain point, so that the salinity change condition of the position can be obtained according to the resistivity value of the point, further, whether seawater invasion exists in the position or not can be known, but the invasion direction can not be determined, and therefore the dynamic monitoring requirement of the three-dimensional space under the triggering condition of a seawater invasion-soil salinization disaster chain can not be met.

Disclosure of Invention

In order to solve the problem that the conventional monitoring probe is still limited to large-scale detection in one-dimensional and two-dimensional spaces and cannot meet the specific fine detection requirement, the invention provides a three-dimensional resistivity in-situ monitoring probe, which adopts the following scheme:

a three-dimensional resistivity in-situ monitoring probe comprises a probe rod with a built-in slave circuit, a master control cabin with a built-in host circuit and a conical tip, wherein the master control cabin is positioned at the upper end of the probe rod, and the conical tip is positioned at the lower end of the probe rod, and the probe rod comprises: each group of resistivity sensor modules comprises a plurality of insulating rings, the tops of the insulating rings are provided with protruding structures, the bottom ends of the insulating rings are provided with groove structures matched with the protrusions, the top surfaces of the insulating rings are provided with at least 3 point electrode grooves and two positioning columns with upper and lower through holes for inserting the insulating rings, and the point motor grooves are located at the outer edges of the insulating rings; the top end of the conical tip connector is provided with two limiting columns for assembling the resistivity sensor module; the cabin connector is provided with a wiring end matched with the main cabin; during installation, each group of resistivity sensors are sequentially sleeved on the two limiting columns, the top ends of the resistivity sensors are connected with the main cabin through the cabin connector, and the bottom ends of the resistivity sensors are connected with the conical tip.

Further, the protrusion is an annular protrusion.

Further, the thickness of the insulating ring is 5 mm.

Further, the number of the motor grooves is 4.

Furthermore, the insulating ring is made of nylon.

Further, the point electrode grooves are symmetrically distributed.

Compared with the prior art, the invention has the advantages and positive effects that:

according to the invention, a plurality of groups of resistivity sensor modules are sleeved, each group of resistivity sensor module comprises a plurality of insulating rings, at least 3 point electrodes can be arranged on the top surface of each insulating ring, detection of different electrode arrangement modes and different layer numbers can be realized, and a three-dimensional resistivity dynamic monitoring system can be constructed by the structure. The migration rule and mechanism of water and salt migration in special soil bodies caused by different disaster chain causes can be revealed through a three-dimensional resistivity dynamic monitoring system, and high-resolution and high-precision in-situ long-term monitoring on the dynamic change process of water and salt migration space distribution in coastal zones is realized.

Drawings

FIG. 1-1 is an exploded view of a three-dimensional resistivity in situ monitoring probe configuration according to an embodiment of the present invention;

FIG. 1-2 is a schematic view of the end cap of FIG. 1-1;

FIGS. 1-3 are schematic structural views of the main control cabin shown in FIG. 1-1;

FIGS. 1-4 are schematic views of the pod connector of FIGS. 1-1;

FIGS. 1-5 are schematic diagrams of the resistivity sensor module of FIGS. 1-1;

FIGS. 1-6 are schematic views of the tapered tip connector of FIGS. 1-1;

FIGS. 1-7 are schematic views of the structure of the cone tip of FIG. 1-1;

FIG. 2 is a first schematic view of an insulating ring and a slave circuit mounting structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a second circuit mounting structure of an insulating ring and a slave device according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a mounting structure of groups of resistivity sensor modules according to an embodiment of the invention;

FIG. 5 is a schematic diagram of a detection region of the spatial resistivity cross-inversion technique according to an embodiment of the present invention

FIG. 6 is a schematic diagram of the detection of the cross section of the horizontal circular row of point electrodes in accordance with the present invention;

FIG. 7 is a schematic diagram of a vertical Wennan resistivity test according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of rolling detection of the line electrodes according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of multi-layer composite spot electrode extension probing according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of the directional detection of spatial point electrodes according to an embodiment of the present invention;

FIG. 11-1 is a vertical point location distribution profile of an embodiment of the present invention;

FIG. 11-2 is a horizontal point location distribution profile of an embodiment of the present invention;

in the figure: solid dots represent electrode positions; the hollow circle represents the measurement data point location;

FIG. 12 is a diagram of calculated point placement according to an embodiment of the present invention;

in the figure: + represents a solution point location; solid points represent known point locations; the open circles indicate transition points.

Detailed Description

Referring to fig. 1-1 to fig. 1-7, the present invention provides a three-dimensional resistivity in-situ monitoring probe, which comprises a main control cabin, a cabin connector, a probe rod and a cone tip from top to bottom.

The probe rod of the invention adopts a module plug-in structure, and comprises a plurality of groups of resistivity sensor modules, a cabin body connector and a cone tip connector, and referring to fig. 2 to 4, each group of resistivity sensor modules comprises a plurality of insulating rings 1 which are mutually overlapped, the top of each insulating ring 1 is provided with a bulge structure 1-1, the bottom is provided with a groove structure matched with the bulge, the top surface of each insulating ring is provided with 4 point electrode grooves 1-2 (6 and 8 can also be arranged) and two positioning columns 2 with upper and lower through holes for plugging the insulating rings, and the point motor grooves are positioned at the outer edge of the insulating ring; the top end of the conical tip connector is provided with two limiting columns 3 for assembling the resistivity sensor module; the cabin connector is provided with a wiring end matched with the main cabin.

The resistivity sensor module, the positioning column, the limiting column, the main control cabin body and other strength materials are all made of PEEK2000 materials (added with 30% of medium viscosity polyether-ether-ketone, carbon fibers or glass fiber reinforced compounds), the point electrodes are made of brass materials, and silver chloride is electroplated.

During assembly, nuts are embedded at the bottom ends of the two positioning columns, the slave circuit board is fixed, the insulating rings provided with the point electrodes are overlapped and sleeved on the positioning columns, the tops of the insulating rings are fastened through the nuts, and the assembly of the resistivity sensor module is completed. And then a plurality of resistivity sensor modules are sequentially sleeved on the two limiting columns, the top ends of the resistivity sensor modules are connected with the main cabin through the cabin connector, and the bottom ends of the resistivity sensor modules are connected with the conical tip.

The outer diameter of the main body part of the three-dimensional resistivity in-situ monitoring probe of the embodiment

The effective monitoring length is 800mm, and the total length is 1200 mm; the point electrodes are distributed in a horizontal annular shape at equal intervals of 4 points, and vertical lines are distributed at equal intervals, wherein the interval is 5 mm; each horizontal section comprises 4 electrodes, and 160 sections are vertically distributed for 640 electrodes in total.

The three-dimensional resistivity in-situ monitoring system of the embodiment adopts a master-slave data acquisition control structure, and can realize detection and rapid switching of various electrode arrangement modes. The host circuit in the host cabin structurally comprises units (an internal independent battery is adopted for power supply) for data transmission, storage, control, communication, power supply and the like, and can provide two power supply modes of constant current (0.01A/0.1A/1A/5A) and constant voltage (0.1V/0.5V/2V/10V). The main circuit body of the main machine is connected with each slave machine in the probe rod through a bus structure passing through the watertight connector. In addition, the host computer can flexibly carry out functions of code modification, real-time communication, data transmission, parameter adjustment, battery charging and the like with an upper computer through the watertight joint reserved by the end cover.

The slave machines are embedded into the probe rod, each slave machine unit is 80mm long, and is sequentially connected with 64 point electrodes of 16 horizontal sections through binding posts, so that power supply excitation and data acquisition of the 64 electrodes are realized. The slave functional structure comprises functions of data acquisition, transmission, electrode switching and the like, wherein the electrode switching mainly realizes detection of different electrode arrangement modes and different layer numbers through a composite switch conversion matrix.

During specific detection, the method comprises the following steps:

(1) horizontal circular array point electrode section detection

Resistivity detection by the dipolar method is carried out by exciting adjacent electrodes based on four orthogonal point electrodes which are distributed in a ring shape and have the same horizontal section, and the four orthogonal point electrodes are equally spaced, as shown in figure 6. Four data measuring points are obtained on each horizontal section, the horizontal sections of all layers are sequentially measured, and the spatial measurement resolution is 3.5 multiplied by 20.5mm and is approximately equal to 4.95 mm. Finally, by the section measurement by the two-pole method, the measurement point data of a total of 4 · layers × 160 layers, 640 adjacent probes and uniform distribution is obtained.

(2) Vertical line spot electrode roll detection

Based on 160 point electrodes distributed at equal intervals in the same direction and in the vertical direction, four adjacent electrodes are excited, and measurement is performed by a wenner method, as shown in fig. 7. Rolling measurement is performed from top to bottom in sequence, the spatial resolution is 5mm, and 160-3-157 measuring point data are obtained for each line, as shown in fig. 7 and 8.

(3) Multi-layer composite spot electrode extension probing

Based on 160 point electrodes distributed at equal intervals in the same direction and in the vertical direction, the Wenner rolling measurement with larger interval is carried out on the basis of the detection of the point electrodes in the vertical line, as shown in FIG. 9. Wherein, the spatial resolution of the measuring point of the Nth layer (N is less than or equal to 40) is 5mm multiplied by N, and the horizontal detection distance is 0.5 multiplied by (5mm multiplied by N). The number of the measuring points is 160-1-2 XN-159-2N. From layer 1 to layer 40, the total number of measuring points is 5940.

(4) Spatial point electrode orientation detection

Based on the spatial arrangement form of the three-dimensional high-density resistivity in-situ monitoring probe, the rolling detection of the vertical linear point electrodes in four orthogonal directions and the extension detection of the multilayer composite point electrodes are sequentially carried out, so that orthogonal directional detection data with a three-dimensional spatial distribution rule are obtained, as shown in fig. 10.

(5) Cross inversion of space resistivity

And performing interpolation calculation on the space by integrating the composite point electrode cross detection data to obtain complete three-dimensional space detection data. By combining the detection characteristics of the above method, the finally obtained resistivity detection space distribution is known to be a regular ellipsoid, as shown in fig. 5. The closer its interior is to the probe horizontal distance, the higher the spatial resolution of the data. Based on the method, a space resistivity cross inversion technology suitable for the system is established, the resistivity space distribution condition is inverted, and the dynamic change process of the water salt migration space distribution is accurately obtained.

The specific process is as follows:

the high-resolution combined type electrode cross detection device has 160 sections which are vertically distributed, each horizontal section is provided with 4 electrodes, and the total number of the detection device is 640 electrodes.

The resistivity point detected by the detection device can be divided into a vertical structure and a horizontal structure. For a vertical structure, four point positions with equal spacing (n times the distance between two points) are selected at will, and resistivity measurement can be performed by a Wennan method. I.e. the uppermost point is used as a transmitting electrode, the lowermost point is used as a receiving electrode, and the two intermediate points are used as measuring electrodes, so that 157 points with known resistivity are arranged on one side of the detecting device. Also on the other three sides of the sonde there are 157 points of known resistivity on each side. In the horizontal position, four electrodes are orthogonally distributed on each layer, a two-pole method is adopted for resistivity detection between two adjacent point positions, the resistivity value of one known point position can be obtained, and the resistivity values of 4 known point positions can be obtained in one horizontal plane. A total of 160 horizontal structures, 160 × 4 — 640 sites with known resistivity can be obtained. The entire device can obtain the resistivity values of 157 x 4+640 1268 known points, which are contained in a sphere, and the distribution characteristics are shown in fig. 11-1 and fig. 11-2.

In the sphere space, the resistivity values of 1268 points are known, and to estimate the resistivity value of any point in the sphere space, the present embodiment selects four points (closest distance) surrounding the point as the reference point, as shown in fig. 12.

① resistivity size to solve for transition point

When rho₁>ρ₂In the formula, "+/-" is used for subtracting sign, otherwise, is used for adding sign; when rho₃>ρ₄In the formula, "+/-" is used for subtracting sign, otherwise, is used for adding sign; ρ (x)₁Y) first transition point resistivity, ρ (x)₃Y) second transition point resistivity, ρ₁、ρ₂、ρ₃And rho₄Are all known point locations;

② finding the resistivity of solution point position through two transition points

When rho (x)₁，y)>ρ(x₃Y), in the formula, "+/-" is used for subtracting sign, otherwise, is used for adding sign.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.