CN-122018010-A - Array type detection device for high-density direct current method and data fusion method

CN122018010ACN 122018010 ACN122018010 ACN 122018010ACN-122018010-A

Abstract

The invention discloses a high-density direct-current method array type detection device and a data fusion method, which relate to the technical field of geophysical exploration engineering and comprise an electrode array module; the invention fuses potential data, contact impedance information and electrode positioning confidence coefficient obtained by multiple injection-measurement sequences, and is used for realizing closed loop optimization measurement flow from data acquisition to imaging-scheduling by multi-scale purification, local inversion and uncertainty perception fusion, and is oriented to application scenes such as urban pipeline positioning, near-stratum mineral exploration, groundwater and archaeological exploration, and the like, and the local inversion result and uncertainty thereof are used as fusion weights, and space connectivity is maintained in the fusion process, so that artifacts caused by isolated noise can be effectively inhibited, real geometric forms of abnormal objects are maintained, and the robustness and engineering interpretability of imaging results are remarkably improved.

Inventors

SUN WEI
XUE HAIJUN
MEN XIAOGANG
XUE JIANG
LIU JIANG

Assignees

陕西省煤田物探测绘有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (9)

1. An array type detection device for a high-density direct current method, which is characterized by comprising: The electrode array module is used for arranging a plurality of rows of injection/measurement electrodes according to a high-density rule and injecting controllable direct current excitation to obtain an original potential field; the data acquisition module is used for carrying out time and space position alignment on the original potential field to obtain aligned potential data; the signal preprocessing module is used for implementing contact impedance compensation and multi-scale noise suppression on the aligned potential data to obtain a purified potential field; the space inversion module is used for performing space inversion on the purifying potential field based on physical constraint to obtain a conductivity distribution candidate diagram; The characteristic extraction module is used for extracting geometric and amplitude parameters of an abnormal body from the conductivity distribution candidate graph to obtain abnormal parameters; And the imaging and alarming module is used for generating positioning imaging based on the abnormal parameters and outputting alarming and visual results.
2. The high-density direct current method array type detection device according to claim 1, wherein the electrode array module adopts staggered overlapping injection paths and programmable segment spacing for generating depth differential sensitivity in adjacent measurements, and improved deep response signal-to-noise ratio is obtained, so that previous injection path information is reserved in subsequent inversion to assist interlayer discrimination.
3. The high-density direct current method array type detection device according to claim 1, wherein the data acquisition module is synchronous with a global time reference through fusion electrode position tracking and is used for eliminating electrode positioning errors and clock drift to obtain high-precision time-space alignment potential data, and the alignment potential data is used as input of subsequent purification and inversion.
4. The high-density direct current method array type detection device according to claim 1, wherein the signal preprocessing module adopts synchronous demodulation and local baseline self-adaptive estimation based on a reference electrode network, and is used for restraining contact impedance and environmental low-frequency drift while keeping space details so as to obtain the stable purifying potential field.
5. The array type detection device of the high-density direct current method according to claim 1, wherein the space inversion module is used for locking global conductivity trend by low-resolution chromatography based on a layering-local coupling inversion process of priori physical boundary constraint, then performing layer-by-layer refinement by utilizing local correction kernels in a high uncertainty region to obtain the conductivity distribution candidate graph with global stability and local resolution, and recording uncertainty distribution for self-adaptive measurement scheduling.
6. The high-density direct current method array type detection device according to claim 1, wherein the feature extraction module is used for separating geometric connectivity information from a candidate graph and calculating volume, peak value contrast and connectivity indexes of an abnormal body through morphological consistency filtering and spatial coherence clustering to obtain structured abnormal parameters, so that false alarm rate based on isolated noise points is remarkably reduced.
7. The high-density direct current method array type detection device according to claim 1, further comprising an adaptive measurement scheduling module, wherein the adaptive measurement scheduling module is used for dynamically adjusting a subsequent injection/measurement sequence based on uncertainty distribution of the inversion module and abnormal parameters obtained by the feature extraction, and is used for maximizing detection sensitivity and positioning accuracy of a target area under limited measurement times and obtaining a detection result with significantly improved measurement efficiency.
8. A high-density direct current method array type detection data fusion method, which is characterized by being applied to the high-density direct current method array type detection device as claimed in any one of the claims 1 to 7, and comprising the following steps: s1, acquiring original potential signals from a plurality of injection/measurement sequences and different injection modes of an electrode array to obtain a plurality of groups of original potential field data; S2, carrying out position and time registration on the multiple groups of original potential field data based on the electrode positions and the global time reference to obtain aligned potential data; S3, carrying out contact impedance estimation and local baseline correction on the alignment potential data, and decomposing decoupling noise and a coupling term according to a spatial scale to obtain a purified potential field; S4, inverting the purifying potential field on a partition or layering scale respectively, and recording uncertainty distribution of each inversion result to obtain a plurality of local conductivity maps with uncertainty; s5, carrying out consistency correction and fusion on the spatial level based on the local conductivity map with uncertainty, and outputting joint conductivity distribution and a corresponding uncertainty map; S6, generating positioning imaging and structuring abnormal parameters based on the combined conductivity distribution and uncertainty map and outputting a priority list for subsequent self-adaptive measurement scheduling.
9. The method for fusing array probe data according to claim 8, wherein in step S5, a multi-scale coarse-to-fine weighted fusion strategy is adopted, and weights in the weighted fusion strategy are determined by inversion uncertainty of each local conductivity map, contact impedance estimation confidence of corresponding measurement times, and electrode position/posture confidence.

Description

Array type detection device for high-density direct current method and data fusion method Technical Field The invention relates to the technical field of geophysical exploration engineering, in particular to a high-density direct current method array type detection device and a data fusion method. Background The high-density direct current method has the advantages of higher resolution and wide coverage range, and is widely applied to engineering scenes such as urban pipeline positioning, near-stratum mineral exploration, groundwater and archaeological exploration. The technology is characterized in that direct current excitation is injected through an electrode array, potential signals are collected, and underground medium conductivity distribution is obtained through data processing and inversion imaging, so that a target abnormal body is identified. The existing high-density direct current method array type detection device and data processing method still have obvious technical bottlenecks in practical engineering application. The key defect is that in the prior art, fixed injection paths and sub-measurement planning are adopted, uncertainty distribution of inversion results, contact impedance and confidence difference of electrode positioning are ignored in the data fusion process, and inversion imaging and anomaly identification are carried out only by means of a single data source or fixed weight. The detection process cannot be dynamically adapted to the complexity of the underground medium, the isolated noise is easy to form artifact interference, the real geometric form and amplitude characteristics of the abnormal body are difficult to accurately reserve, the robustness and engineering interpretability of an imaging result are reduced, erroneous interpretation is easy to be caused by single data source errors, and the engineering decision risk is increased. In view of the above, the present application provides a high-density direct current method array type detection device and a data fusion method for solving the above problems. Disclosure of Invention The invention aims to provide a high-density direct current method array type detection device and a data fusion method, which are used for solving the problems that the complexity of an underground medium cannot be dynamically adapted in the detection process in the prior art, the isolated noise is easy to form artifact interference, and the real geometric form and amplitude characteristics of an abnormal body are difficult to accurately reserve. In order to achieve the above object, the present invention provides the following technical solutions: in a first aspect, the present application provides a high density direct current method array type detection device, comprising: The electrode array module is used for arranging a plurality of rows of injection/measurement electrodes according to a high-density rule and injecting controllable direct current excitation to obtain an original potential field; the data acquisition module is used for carrying out time and space position alignment on the original potential field to obtain aligned potential data; the signal preprocessing module is used for implementing contact impedance compensation and multi-scale noise suppression on the aligned potential data to obtain a purified potential field; the space inversion module is used for performing space inversion on the purifying potential field based on physical constraint to obtain a conductivity distribution candidate diagram; The characteristic extraction module is used for extracting geometric and amplitude parameters of an abnormal body from the conductivity distribution candidate graph to obtain abnormal parameters; And the imaging and alarming module is used for generating positioning imaging based on the abnormal parameters and outputting alarming and visual results. Further, the electrode array module adopts staggered overlapping injection paths and programmable segment spacing for generating depth differential sensitivity in adjacent measurements, and obtains improved deep response signal-to-noise ratio, so that previous injection path information is reserved in subsequent inversion to assist interlayer discrimination. Further, the data acquisition module is synchronized with a global time reference through fusion electrode position tracking (optical or magnetic positioning) and is used for eliminating electrode positioning errors and clock drift, so that high-precision time-space alignment potential data is obtained, and the alignment potential data is used as input for subsequent purification and inversion. Furthermore, the signal preprocessing module adopts synchronous demodulation and local baseline self-adaptive estimation based on a reference electrode network, is used for restraining contact impedance and environmental low-frequency drift while preserving space details to obtain a stable purification potential field, and further decouples