A network parallel electric method detecting method capable of eliminating influence of electrode polarization effect

Abstract

The application discloses a network parallel electric method detection method capable of eliminating the influence of electrode polarization effect, and a laid electric method detection system compared with the existing network parallel electric method detection system only needs to additionally add a polarization measurement electrode P for polarization measurement. When the electric method detection is performed, the reference measurement is first performed to obtain the reference potential difference of each measurement electrode, then the conventional measurement is performed to obtain the potential difference of each measurement electrode before each detection, and then the polarization measurement is performed to obtain the polarization potential difference of each measurement electrode; then the polarization potential difference of each measurement electrode is subtracted from the corresponding reference potential difference to obtain the potential offset value of each measurement electrode caused by polarization, and finally the potential difference of each measurement electrode in the conventional measurement is subtracted from the corresponding potential offset value, so that the real potential data after the polarization effect is eliminated is obtained. This method can effectively eliminate the influence of electrode polarization effect on the electric method detection, and ensure the accuracy of the network parallel electric method detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical detection, and particularly relates to a network parallel electrical detection method capable of eliminating the influence of electrode polarization effect. BACKGROUND

[0002] As a commonly used geophysical exploration method, electrical detection reflects the resistivity distribution of underground medium (such as soil, rock, etc.) by arranging electrodes on the ground, applying current and measuring potential difference. However, in actual application, the polarization effect occurs after the power supply electrode applies current, which causes the electrode potential to drift, so that the voltage measured by the electrode as a measurement electrode in the subsequent process will be deviated. The existing compensation method usually adopts a double-mode electrode technology, that is, one set of electrodes is used for power supply and another set of electrodes is used for measurement, which can eliminate the influence of polarization effect, but needs to arrange two sets of electrodes, and the equipment cost and construction cost are high.

[0003] The traditional electrical measurement process is mainly through the arranged electrodes to be used as A, B, M and N electrodes in turn (A and B electrodes are used for power supply, and M and N electrodes are used for measurement). In addition, the network parallel electrical detection method is proposed by the industry scholars, which arranges a reference electrode N. In the measurement process, the potential values of each electrode and the reference electrode are measured respectively, and then the potential difference of each electrode is obtained by subtracting the potential of the reference electrode from the potential of each electrode. Finally, the potential difference between each electrode is calculated by subtracting each other, which can effectively speed up the measurement speed of electrical detection. However, both the traditional electrical measurement method and the parallel electrical measurement method face the problem of data distortion caused by the polarization of the electrode power supply in the subsequent measurement.

[0004] Therefore, how to provide a new electrical detection method, which can effectively eliminate the influence of electrode polarization effect on electrical detection under the premise of low construction cost, and ensure the accuracy of network parallel electrical detection, is the research direction of the present application. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides a network parallel electrical detection method capable of eliminating the influence of electrode polarization effect, which can effectively eliminate the influence of electrode polarization effect on electrical detection under the premise of low construction cost, and ensure the accuracy of network parallel electrical detection.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a network parallel electrical detection method capable of eliminating the influence of electrode polarization effect, and the specific steps are as follows:

[0007] Step one, the electrical detection system layout: according to the network parallel electrical method in the required detection area C measurement electrode, while laying a reference electrode N and a remote electrode B; Then in each measurement electrode near the laying of a polarization measurement electrode P, for polarization measurement; The polarization measurement electrode P is laid in the position close to each measurement electrode, such as the center of the measuring line formed by each measurement electrode, so as to further ensure the accuracy of subsequent correction.

[0008] Step two, the reference measurement: first, the polarization measurement electrode P and the remote electrode B power supply, all measurement electrode and reference electrode N relative potential measurement, record the potential difference between each measurement electrode and reference electrode N Pbase,i , i = 1, 2, 3,..., C;

[0009] Step three, the conventional measurement: using network parallel electrical method for detection area for electrical detection, so as to obtain all the measurement electrode and reference electrode N between the potential difference, recorded as U i , i represents the potential difference between the i-th measurement electrode and reference electrode N;

[0010] Step four, polarization measurement: after completing the electrical detection, the polarization measurement electrode P and the remote electrode B power supply, in this case, the potential difference between all measurement electrode and reference electrode N is obtained, recorded as U P,i , i represents the potential difference between the i-th measurement electrode and reference electrode N;

[0011] Step five, the cycle measurement: step three and four constitute a complete electrical detection process, the subsequent detection area each electrical detection are recycled once step three and four, until the completion of all electrical detection process;

[0012] Step six, data correction processing to eliminate the influence of polarization effect: the data in each electrical detection using step two of the reference measurement data for correction, so as to obtain the true potential data after eliminating the polarization effect of each electrical detection;

[0013] Step seven, electrical imaging: using the true potential data obtained in step six for electrical data processing, so as to obtain the imaging results of the detection area.

[0014] Further, the step six is specifically: selecting each measurement electrode U P,i obtained by polarization measurement in one of the electrical detection, and each measurement electrode U Pbase,i of the reference measurement, and calculating the potential offset ΔU P,i caused by polarization:

[0015] ΔU P,i = U P,i - U Pbase,ii = 1, 2, 3, ..., C

[0016] Subsequently, this potential shift was used to measure the U values ​​of each measuring electrode obtained from conventional measurements in the same electrical resistivity probe. i After correction, the true potential data U after eliminating the polarization effect was obtained. corr,i ;

[0017] U corr,i =U i -ΔU P,i i = 1, 2, 3, ..., C

[0018] This step is repeated for each subsequent test to obtain the true potential data after eliminating the polarization effect in each electrical detection.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. Compared with the existing network parallel electrical resistivity detection system, the electrical resistivity detection system deployed in this invention does not require a dual-mode electrode system, but only requires an additional polarization measurement electrode P for polarization measurement; this method is not only convenient to deploy, but also has a lower construction cost.

[0021] 2. In this invention, when performing electrical resistivity tomography (ORT), a reference measurement is first performed to obtain the reference potential difference of each measuring electrode. Then, for each detection of the same detection area, a conventional measurement is first performed to obtain the potential difference of each measuring electrode, followed by a polarization measurement to obtain the polarization potential difference of each measuring electrode. Next, for each detection, the polarization potential difference of each measuring electrode is subtracted from the reference potential difference of each measuring electrode to obtain the potential offset value of each measuring electrode caused by polarization. Finally, the potential difference of each measuring electrode during the conventional measurement is subtracted from its corresponding potential offset value to obtain the true potential data after eliminating the polarization effect in each ORT. This method can effectively eliminate the influence of electrode polarization effect on ORT and ensure the accuracy of network parallel ORT. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the arrangement of the electrical detection system in this invention;

[0023] Figure 2 This is the overall flowchart of the present invention;

[0024] Figure 3 This is a schematic diagram of the data correction process in this invention. Detailed Implementation

[0025] The present invention will be further described below.

[0026] like Figure 2 As shown, the specific steps of this invention are as follows:

[0027] Step 1: Deployment of the electrical resistivity tomography (ORT) system: Following the existing parallel ORT method, deploy C measuring electrodes in the desired detection area, along with a reference electrode N and an infinity electrode B. Then, deploy a polarization measuring electrode P near each measuring electrode for polarization measurement. The polarization measuring electrode P is positioned close to all measuring electrodes, such as at the center of the measurement line formed by the electrodes, to further ensure subsequent calibration accuracy. Furthermore, all the electrodes mentioned above are existing, identical electrodes, ensuring consistency in subsequent polarization measurements across different electrodes.

[0028] Step 2, Reference Measurement: First, power is supplied to the polarization measurement electrode P and the infinity electrode B. The relative potentials of all measurement electrodes and the reference electrode N are measured, and the potential difference U between each measurement electrode and the reference electrode N is recorded. Pbase,i , i = 1, 2, 3, ..., C.

[0029] Step 3, Routine Measurement: A network parallel electrical resistivity tomography (ERT) method is used to perform an ERT on the detection area to obtain the potential difference between each measuring electrode and the reference electrode N, which is recorded as U. i , where i represents the potential difference between the i-th measuring electrode and the reference electrode N.

[0030] Step 4, Polarization Measurement: After completing one electrical detection step, power is supplied to the polarization measurement electrode P and the infinity electrode B. Under these conditions, the potential difference between each measurement electrode and the reference electrode N is obtained and recorded as U. P,i , where i represents the potential difference between the i-th measuring electrode and the reference electrode N.

[0031] Step 5, Cyclic Measurement: Steps 3 and 4 together constitute a complete electrical resistivity tomography (ORM) detection process. Steps 3 and 4 are repeated every time an ORM is applied to the detection area until all ORM detection processes are completed.

[0032] Step Six: Data Correction Processing to Eliminate Polarization Effects: The data from each electrical resistivity tomography (ERT) probe are corrected using the baseline measurement data from Step Two, thus obtaining the true potential data after eliminating polarization effects for each ERT probe. Figure 3 As shown, specifically: selecting the U values ​​of each measuring electrode obtained from polarization measurement in one of the electrical resistivity tomography (EDT) measurements. P,i U of each measuring electrode during reference measurement Pbase,i Calculate the potential shift ΔU caused by polarization by performing the difference operation. P,i :

[0033] ΔU P,i =U P,i -U Pbase,i i = 1, 2, 3, ..., C

[0034] Subsequently, the potential offset is used to correct the U of each measuring electrode obtained by the conventional measurement in the same electrical detection i to obtain the real potential data U after polarization effect elimination in this detection corr,i ;

[0035] U corr,i = U i - ΔU P,i , i = 1, 2, 3,..., C

[0036] The step is repeated in the rest of the detections to obtain the real potential data after polarization effect elimination in each detection.

[0037] Step seven, electrical imaging: the real potential data obtained in step six is used to process the electrical data by using the existing method to obtain the imaging result of the detection area.

[0038] The above only describes the preferred embodiments of the present application, and it should be noted that the ordinary skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A network parallel electrical resistivity tomography method capable of eliminating the influence of electrode polarization effects, characterized in that, The specific steps are as follows: Step 1: Deployment of the electrical detection system: Deploy C measuring electrodes in the required detection area according to the network parallel electrical method, and simultaneously deploy a reference electrode N and an infinity electrode B; then deploy a polarization measuring electrode P near each measuring electrode for polarization measurement. Step 2, Reference Measurement: First, power is supplied to the polarization measurement electrode P and the infinity electrode B. The relative potentials of all measurement electrodes and the reference electrode N are measured, and the potential differences between each measurement electrode and the reference electrode N are recorded. ; Step 3, Routine Measurement: A network parallel electrical resistivity tomography (ERT) method is used to perform a single ERT measurement of the detection area, thereby obtaining the potential difference between each measuring electrode and the reference electrode N, and recording it as follows: , Indicates the first The potential difference between the measuring electrode and the reference electrode N; Step 4, Polarization Measurement: After completing one electrical resistivity tomography (OR) probe, power is supplied to the polarization measurement electrode P and the infinity electrode B. Under these conditions, the potential differences between all measurement electrodes and the reference electrode N are obtained and recorded. , Indicates the first The potential difference between the measuring electrode and the reference electrode N; Step 5, Cyclic Measurement: Steps 3 and 4 together constitute a complete electrical resistivity tomography (ORM) detection process. Steps 3 and 4 are repeated every time an ORM is applied to the detection area until all ORM detection processes are completed. Step Six: Data Correction Processing to Eliminate Polarization Effects: The data from each electrical resistivity tomography (ERT) probe is corrected using the baseline measurement data from Step Two. Specifically, this involves selecting the polarization measurement data from one of the ERT probes for each measuring electrode. Each measuring electrode was compared with the reference measurement. Calculate the potential shift caused by polarization by performing a difference operation. : ； Subsequently, this potential shift was used to analyze the various measuring electrodes obtained from conventional measurements in the same electrical resistivity probe. After correction, the true potential data after eliminating the polarization effect was obtained. ; ； This step is repeated for each subsequent test to obtain the true potential data after eliminating the polarization effect in each electrical detection. Step 7, Electrical Imaging: The actual potential data obtained in Step 6 is used for electrical data processing to obtain the imaging results of the detection area.

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