Device and method for detecting cable path in fireproof plug

Abstract

The invention relates to a device and method for detecting a cable path in a fireproof plug, and the method comprises the steps: enabling a transmitting unit to sequentially activate different coils to output an adjustable frequency, and forming a dynamic scanning electromagnetic induction matrix; the receiving unit senses the magnetic field intensity generated by a secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and outputs an original magnetic field signal; the data processing unit performs deep processing and analysis on the original magnetic field signal to obtain spatial position information and material attribute information of the target cable; and the image integration unit performs image fusion based on the spatial position information and the material attribute information to obtain a three-dimensional visual model and a trepanning guidance strategy. According to the invention, through multi-frequency electromagnetic scanning, adaptive signal processing and three-dimensional visual modeling, accurate positioning and safe trepanning evaluation of a cable path in a plugging material are realized, the detection efficiency is obviously improved, the risk is thoroughly eliminated, and the operation and maintenance efficiency of a nuclear power station is improved.

Description

Technical Field

[0001] This invention relates to the technical field of nuclear power plant safety protection, and more specifically, to a device and method for detecting cable paths within fireproof enclosures. Background Technology

[0002] The primary function of cable fire sealing is to reduce the probability of cable ignition and effectively isolate areas prone to fire spread, thereby minimizing accident losses and shortening recovery time. In nuclear power plants, the selection and application of cable sealing materials are crucial. Common materials include inorganic fire-retardant cement, silicone foam, silicone rubber, lead-containing copper silicate foam, silicone cloth, and sealants. The performance of these materials directly affects the reliability and durability of the fire sealing.

[0003] In the actual operation of nuclear power plants, new cables are frequently laid and existing cables are replaced or rearranged as needed for technical upgrades. This inevitably involves opening existing fire-sealed cables. Statistics show that nuclear power plant sites conduct hundreds of fire-sealed opening operations annually.

[0004] During nuclear power plant operation, the frequent opening of fire-resistant cable sealing operations (such as laying or replacing new cables) presents the following technical bottlenecks: **Unvisualized Cable Paths:** Existing sealing materials (such as inorganic fire-resistant cement and silicone foam) result in irregular cable placement, making it difficult for workers to determine cable routes based solely on surface observation. Traditional tools (such as chisels) can easily puncture live cables, leading to electric shock accidents or power / communication interruptions. **Lack of Detection Methods:** Existing electromagnetic detection equipment is mostly used for locating underground pipelines, but it has not been optimized for the complex electromagnetic characteristics of nuclear power plant sealing materials (such as the coexistence of high-density inorganic materials and organic foam), resulting in low detection accuracy and poor anti-interference capabilities. **Inefficiency and Risk:** Manually removing sealing materials requires repeated verification of cable locations, is time-consuming, and cannot completely eliminate risks, impacting the efficiency of nuclear power plant operation and maintenance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a device and method for detecting cable paths within fireproof sealing, addressing the problems existing in the prior art.

[0006] The technical solution adopted by this invention to solve its technical problem is: to construct a detection device for cable paths within a fireproof enclosure, comprising: The transmitting unit is used to sequentially activate different coils to output an adjustable frequency and form a dynamic scanning electromagnetic induction matrix; The receiving unit is used to sense the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and output the original magnetic field signal. A data processing unit is used to acquire the original magnetic field signal and perform in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable. An image integration unit is used to perform image fusion based on the spatial location information and material property information to obtain a three-dimensional visualization model and an opening guidance strategy.

[0007] In the fireproof sealing cable path detection device of the present invention, the transmitting unit includes: a signal modulation module, a power amplification and compensation module, and an electromagnetic pulse transmitter; The signal modulation module is used to load parameters and generate an excitation signal based on the parameters; The electromagnetic pulse transmitter is used to sequentially activate different coils according to the excitation signal to output an adjustable frequency, forming a dynamic scanning electromagnetic induction matrix, and forming a harmonic magnetic field through the dynamic scanning electromagnetic induction matrix. The power amplification and compensation module is used to monitor the magnetic field strength generated by the secondary current of the receiving unit in real time, and to compensate for the magnetic field loss of the sealing material when the magnetic field strength is lower than a set threshold.

[0008] In the fireproof sealing cable path detection device of the present invention, the receiving unit includes: a signal receiver, a signal conditioning module, an analog-to-digital conversion module, and a noise reduction module; The signal receiver is used to sense the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix; The signal conditioning module is used to filter the magnetic field strength; The analog-to-digital conversion module is used to perform analog-to-digital conversion on the signal after it has been filtered by the signal conditioning module, and generate a magnetic field strength matrix. The denoising module is used to perform preliminary denoising on the signal of the magnetic field strength matrix to obtain the original magnetic field signal.

[0009] In the fireproof sealing cable path detection device of the present invention, the signal receiver includes: a magnetic field coupling module; the magnetic field coupling module adopts a three-layer coil structure; the three-layer coil structure includes: an inner coil, a middle coil, and an outer coil; The inner coil is used to shield against power frequency interference at the nuclear power plant site; The middle layer coil is used to receive the magnetic field strength; The outer coil is used to shield against interference from the primary magnetic field.

[0010] In the fireproof sealing cable path detection device of the present invention, the data processing unit includes: a depth denoising module, a feature extraction module, a material identification module, and a spatial positioning module; The deep denoising module is used to perform deep denoising on the original magnetic field signal to obtain effective frequency band data; The feature extraction module is used to extract features based on the effective frequency band data to obtain feature data; The material identification module is used to identify materials based on the feature data to obtain the material property information of the target cable. The spatial positioning module is used to locate the target cable based on the effective frequency band data and obtain the spatial location information of the target cable.

[0011] In the fireproof sealing cable path detection device of the present invention, the deep noise reduction module includes: a noise removal submodule and a secondary filtering submodule; The noise removal submodule is used to perform multi-resolution decomposition of the original magnetic field signal using wavelet transform, and remove high-frequency noise components based on the distribution differences between noise and effective signal at different scales. The secondary filtering submodule is used to perform frequency domain matching on the signal after high-frequency noise components have been removed based on the secondary magnetic field filter template to obtain the effective frequency band data.

[0012] In the fireproof sealing cable path detection device of the present invention, the feature extraction module includes: a phase extraction submodule and a quality factor calculation submodule; The phase extraction submodule is used to calculate the magnetic field strength amplitude and relative offset of each sampling point; The quality factor calculation submodule is used to extract the center frequency, half-power bandwidth, and resonant point amplitude, and to calculate the quality factor based on the center frequency and the half-power bandwidth.

[0013] In the fireproof sealing cable path detection device of the present invention, the material identification module includes: a feature input submodule and an identification submodule; The feature input submodule is used to determine the phase angle corresponding to each sampling point based on the relative offset, and integrate the phase angle corresponding to each sampling point, the amplitude of the resonant point, and the quality factor to obtain the input feature vector; The identification submodule is used to input the input feature vector into a random forest classification model to identify the material type and obtain the material property information of the target cable.

[0014] In the fireproof sealing cable path detection device of the present invention, the image integration unit includes: a three-dimensional reconstruction module, a material rendering module, and a safety opening area marking module; The three-dimensional reconstruction module is used to perform three-dimensional spline interpolation and smoothing on discrete cable location points using a spatial quantization model based on the spatial location information to obtain a continuous cable path curve. The thickness parameters of the entrance-side fireproof sealing structure are then superimposed on the continuous cable path curve to generate a three-dimensional spatial trajectory model of the target cable within the sealing layer. The material rendering module is used to perform color rendering on the three-dimensional spatial trajectory model according to the material property information; The safety opening area annotation module is used to annotate the color-rendered 3D spatial trajectory model and output the 3D visualization model and opening guidance strategy.

[0015] This invention also provides a method for detecting cable paths within fireproof sealing, comprising: The transmitting unit sequentially activates different coils to output an adjustable frequency and forms a dynamic scanning electromagnetic induction matrix; The receiving unit senses the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and outputs the original magnetic field signal. The data processing unit acquires the original magnetic field signal and performs in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable; The image integration unit performs image fusion based on the spatial location information and material property information to obtain a three-dimensional visualization model and an opening guidance strategy.

[0016] The detection device and method for cable paths within fire-resistant sealing materials according to the present invention have the following beneficial effects: The transmitting unit sequentially activates different coils to output an adjustable frequency and forms a dynamic scanning electromagnetic induction matrix; the receiving unit senses the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix and outputs the original magnetic field signal; the data processing unit performs in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable; and the image integration unit performs image fusion based on the spatial location information and material property information to obtain a three-dimensional visualization model and an opening guidance strategy. This invention, through multi-frequency electromagnetic scanning, adaptive signal processing, and three-dimensional visualization modeling, achieves precise positioning of cable paths and safe opening assessment within sealing materials, significantly improving detection efficiency while completely eliminating risks and improving the operation and maintenance efficiency of nuclear power plants. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the detection device for cable paths within fireproof sealing provided in this embodiment of the invention; Figure 2 This is a flowchart of a method for detecting cable paths within a fireproof enclosure, as provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To address the problems associated with frequent opening operations of existing fire-sealed cables in nuclear power plants, this invention provides a device for detecting cable paths within fire-sealed materials. Through multi-frequency electromagnetic scanning, adaptive signal processing, and 3D visualization modeling, it achieves precise positioning of cable paths and safe opening assessment within the sealing material. Based on the principle of electromagnetic induction, this invention uses the differences in conductivity and magnetic permeability between the cable under test and the surrounding medium as its primary physical property basis. According to the principle of electromagnetic induction and the study of the spatial and temporal distribution of electromagnetic fields, it detects the changes in inductance values ​​of the target cable and the sealing material at different power and frequency levels using coils (the cable and the sealing material differ in conductivity, magnetic permeability, density, or other physicochemical properties, thus allowing for detection, identification, and differentiation), analyzing the location of the target cable.

[0020] In a preferred embodiment, such as Figure 1 As shown, the cable path detection device within the fireproof sealing area includes: a transmitting unit 100, a receiving unit 200, a data processing unit 300, and an image integration unit 400. The transmitting coil of the transmitting unit 100 provides a harmonic current to establish a harmonic magnetic field. The current (called secondary current) generated by the target cable under the excitation of the harmonic magnetic field produces a corresponding magnetic field strength. The receiving coil of the receiving unit 200 senses the magnetic field strength generated by the secondary current. The data processing unit 300 organizes and analyzes the received signals, converting them into spatial location information and material property information. The image integration unit 400 then fuses these information to generate a three-dimensional visualization model and provides corresponding opening guidance strategies.

[0021] In some embodiments, the transmitting unit 100 is used to sequentially activate different coils to output an adjustable frequency and form a dynamic scanning electromagnetic induction matrix. In this embodiment of the invention, a time-division scanning mechanism is designed to sequentially activate different coils (here, the transmitting coils) through the transmitting unit 100 to output an adjustable frequency of 10kHz-1MHz, thereby forming a dynamic scanning electromagnetic induction matrix.

[0022] In some embodiments, the transmitting unit 100 includes: a signal modulation module 101, a power amplification and compensation module 102, and an electromagnetic pulse transmitter 103; the signal modulation module 101 is used to load parameters and generate an excitation signal based on the parameters; the electromagnetic pulse transmitter 103 is used to sequentially activate different coils according to the excitation signal to output an adjustable frequency, forming a dynamic scanning electromagnetic induction matrix, and forming a harmonic magnetic field through the dynamic scanning electromagnetic induction matrix; the power amplification and compensation module 102 is used to monitor the magnetic field strength generated by the secondary current of the receiving unit 200 in real time, and compensate for the magnetic field loss of the sealing material when the magnetic field strength is lower than a set threshold. Specifically, firstly, based on the characteristics of the cable sealing material, appropriate parameters such as resonant frequency, power reference, and attenuation compensation coefficient are selected. A DDS chip or other chip is then used to generate a harmonic waveform to output a corresponding excitation signal. This excitation signal sequentially activates different coils to output an adjustable frequency, forming a dynamically scanning electromagnetic induction matrix. This matrix then generates a harmonic magnetic field. Simultaneously, the power amplification and compensation module 102 monitors the secondary magnetic field strength of the receiving unit 200 in real time. When the secondary magnetic field strength falls below a set threshold, a PID algorithm is used to increase the power and compensate for the magnetic field loss of the sealing material. The harmonic magnetic field generated by the electromagnetic pulse transmitter 103 is a spatially uniform harmonic magnetic field.

[0023] The receiving unit 200 is used to sense the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and outputs the original magnetic field signal.

[0024] In some embodiments, the receiving unit 200 includes: a signal receiver 201, a signal conditioning module 202, an analog-to-digital conversion module 203, and a noise reduction module 204.

[0025] The signal receiver 201 is used to sense the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamically scanned electromagnetic induction matrix. Preferably, the signal receiver 201 includes a magnetic field coupling module; the magnetic field coupling module adopts a three-layer coil structure; the three-layer coil structure includes an inner coil, a middle coil, and an outer coil; the inner coil is used to shield the power frequency (generally 50Hz power frequency) interference at the nuclear power plant site; the middle coil is used to receive the magnetic field strength; and the outer coil is used to shield the interference of the primary magnetic field. Alternatively, in some other embodiments, the magnetic field coupling module may also adopt a coil structure with more than three layers. The signal conditioning module 202 is used to filter the magnetic field strength. Preferably, the signal conditioning module 202 can adopt a bandpass filter, and the signal is filtered by the bandpass filter to retain only the signal in the metal resonant frequency band. The analog-to-digital conversion module 203 is used to perform analog-to-digital conversion on the signal after being filtered by the signal conditioning module 202 to generate a magnetic field strength matrix. Specifically, the analog-to-digital conversion module 203 uses an analog-to-digital converter to set a scanning step size that meets the requirements to generate a magnetic field strength matrix. The denoising module 204 is used to perform preliminary denoising on the magnetic field strength matrix signal to obtain the original magnetic field signal. Preferably, the denoising module 204 uses a secondary magnetic field waveform template based on simulation analysis of different sealing material properties to remove clutter through frequency domain filtering to obtain the original magnetic field signal.

[0026] The data processing unit 300 is used to acquire the original magnetic field signal and perform in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable.

[0027] In some embodiments, the data processing unit 300 includes: a depth denoising module 301, a feature extraction module 302, a material identification module 303, and a spatial positioning module 304.

[0028] The deep denoising module 301 is used to perform deep denoising on the original magnetic field signal to obtain effective frequency band data. Optionally, in this embodiment of the invention, the deep denoising module 301 includes: a noise removal submodule and a secondary filtering submodule; the noise removal submodule is used to perform multi-resolution decomposition on the original magnetic field signal using wavelet transform, and remove high-frequency noise components according to the distribution differences between noise and effective signals at different scales; the secondary filtering submodule is used to perform frequency domain matching on the signal after removing high-frequency noise components based on the secondary magnetic field filter template to obtain effective frequency band data. Specifically, firstly, the original magnetic field signal received by the array is decomposed into multiple resolutions using wavelet transform, and high-frequency noise components are removed according to the distribution differences between noise and effective signals at different scales. At the same time, a secondary magnetic field waveform template obtained from electromagnetic simulation of different sealing materials (such as fireproof mud, flame-retardant foam, silicone sealant, etc.) is constructed, and frequency domain matching is performed with the measured signal to retain the effective frequency band data that matches the model, thereby realizing secondary filtering.

[0029] The feature extraction module 302 is used to extract features based on effective frequency band data to obtain feature data. Optionally, the feature extraction module 302 includes: a phase extraction submodule and a quality factor calculation submodule; the phase extraction submodule is used to calculate the magnetic field strength amplitude and relative offset of each sampling point; the quality factor calculation submodule is used to extract the center frequency, half-power bandwidth and resonant point amplitude, and calculate the quality factor based on the center frequency and half-power bandwidth.

[0030] Specifically, for each sampling point in the effective frequency band data, its magnetic field strength amplitude (defined as H) and relative offset angle (defined as H) are calculated. The magnetic field strength amplitude H can be directly obtained from the voltage signal induced by the receiving coil after analog-to-digital conversion (ADC) and system calibration. Relative offset angle. This refers to the difference between the phase of the magnetic field signal at the sampling point and the reference phase measured in an environment without a target medium (i.e., only air or homogeneous sealing material). The relative offset angle is also relevant. The specific calculation formula is as follows: = θ_sample - θ_reference; In the above formula, θ_sample is the measured phase of the current sampling point, and θ_reference is the reference phase.

[0031] By calculating the relative offset angle It can reflect the phase lag caused by the magnetic field to the target medium.

[0032] Furthermore, the resonant response curve of the signal is generated based on the effective frequency band data, and then the center frequency is extracted from the resonant response curve of the signal. Half-power bandwidth And the amplitude A at the resonant point. Then, based on the center frequency... and half-power bandwidth Calculate the quality factor (defined as the Q value). The formula for calculating the quality factor Q value is as follows: Q = / ; In the above formula, It is the frequency corresponding to the resonance peak. It is the frequency width at which the amplitude of the resonant peak drops to a multiple of the peak value (i.e., the -3dB point).

[0033] The Q value characterizes the ratio of the efficiency or bandwidth of a resonant circuit to its center frequency. Materials with low energy loss (such as copper) have higher Q values, while materials with high energy loss (such as aluminum) have relatively lower Q values. This can be used for preliminary material screening.

[0034] The material identification module 303 is used to identify materials based on feature data to obtain material property information of the target cable. Optionally, the material identification module 303 includes: a feature input submodule and an identification submodule; the feature input submodule is used to determine the phase angle corresponding to each sampling point based on the relative offset, and integrate the phase angle, resonant point amplitude and quality factor corresponding to each sampling point to obtain an input feature vector; the identification submodule is used to input the input feature vector into a random forest classification model to identify the material type and obtain material property information of the target cable.

[0035] Specifically, the phase angle (θ_sample) corresponding to each sampling point, the amplitude A at the resonant point, and the calculated Q value are used as a set of feature vectors. These vectors are then input into a random forest classification model trained based on the resonant parameters of a large number of material samples to achieve automatic identification of the cable's metallic materials (such as copper and aluminum). By identifying the material properties, the model can differentiate and render cables of different materials in the subsequent visualization stage, and provides additional information for assessing the safety of openings (different materials may correspond to different safety standards).

[0036] The spatial positioning module 304 is used to locate the target cable based on effective frequency band data and obtain the spatial location information of the target cable.

[0037] Specifically, the spatial positioning module 304 first acquires effective frequency band data that has undergone deep denoising and is matched with the model. Then, it inputs this effective frequency band data into a spatial interpolation model based on radial basis functions (RBF) to reconstruct a continuously distributed magnetic field intensity cloud map in three-dimensional space (i.e., a three-dimensional magnetic field cloud map). The spatial location of the target cable is determined by calculating the spatial gradient of this three-dimensional magnetic field cloud map. This is achieved using (x, y, z). At the location of the target cable, due to the significant difference in electromagnetic properties between it and the surrounding sealing materials, the magnetic field strength changes drastically, forming extreme points or ridges on the gradient map. By detecting these gradient maxima and tracing their spatial direction, the three-dimensional position of the target cable can be accurately determined, thus obtaining the spatial location information of the target cable. Specifically: First, based on the radial basis function (RBF), three-dimensional interpolation is performed on the magnetic field strength amplitude matrix to reconstruct a continuously distributed magnetic field strength cloud map in three-dimensional space, and the spatial gradient of this three-dimensional magnetic field cloud map is calculated. (x,y,z); simultaneously, based on the relative offset of each sampling point Generate a phase anomaly distribution map. The extreme regions of (x,y,z) and Spatial overlap analysis is performed on high-value regions when a spatial location simultaneously satisfies... and At that time, the center position of the target cable was determined, among which and The results were obtained through preliminary experiments to calibrate different sealing materials.

[0038] The image integration unit 400 is used to perform image fusion based on spatial location information and material property information to obtain a three-dimensional visualization model and a hole-opening guidance strategy. In this embodiment of the invention, the image integration unit 400 generates a three-dimensional visualization model that can be used for construction guidance based on the spatial coordinates, path, and material type of the target cable output by the data processing unit 300, and provides a corresponding hole-opening guidance scheme.

[0039] Optionally, the image integration unit 400 includes: a 3D reconstruction module 401, a material rendering module 402, and a safety opening area annotation module 403. The 3D reconstruction module 401 is used to perform 3D spline interpolation and smoothing on discrete cable location points using a spatial quantization model based on spatial location information to obtain a continuous cable path curve. The thickness parameters of the entrance-side fireproof sealing structure are then superimposed on the continuous cable path curve to generate a 3D spatial trajectory model of the target cable within the sealing layer. The material rendering module 402 is used to perform color rendering on the 3D spatial trajectory model based on material property information. The safety opening area annotation module 403 is used to annotate the color-rendered 3D spatial trajectory model and output a 3D visualization model and an opening guidance strategy.

[0040] Specifically, the 3D reconstruction module 401, based on the spatial location information output by the spatial positioning module 304 (i.e., the set of 3D magnetic field cloud map and gradient extreme points (i.e., cable location points), calls the spatial quantization model to perform 3D spline interpolation and smoothing on the discrete cable location points, thereby generating a continuous cable path curve. Simultaneously, the known thickness parameters of the fireproof sealing structure on the entrance side are superimposed, ultimately generating a complete 3D spatial trajectory model of the target cable within the sealing layer. Then, the material rendering module 402 uses the OpenGL graphics engine to perform color rendering on the 3D spatial trajectory model based on the material identification results (material property information). The specific rendering rules are: cable segments identified as copper are rendered in red, cable segments identified as aluminum are rendered in blue, and other unknown or undetermined metal materials are distinguished according to a preset color scheme. By color rendering the cable, the intuitive visualization of the cable material properties is achieved.

[0041] In this embodiment of the invention, the safety drilling area marking module 403 automatically calculates the burial depth of each cable and the spatial distance between cables based on a color-rendered 3D spatial trajectory model. Combined with engineering safety specifications, a ±2cm radius around the cable is designated as a no-drilling zone, highlighted in the 3D model with a bright color (e.g., red) as a warning. Simultaneously, safe areas outside the no-drilling zone are clearly marked (e.g., green), ultimately outputting a 3D visualization model and drilling guidance strategy. The drilling guidance strategy integrates the 3D visualization model view, coordinate information, and specific construction suggestions.

[0042] refer to Figure 2 The present invention also provides a method for detecting cable paths within fireproof enclosures. This method for detecting cable paths within fireproof enclosures is based on the cable path detection device disclosed in the embodiments of the present invention.

[0043] Specifically, such as Figure 2 As shown, the detection methods for cable paths within the fireproof enclosure include: Step S201: The transmitting unit 100 sequentially activates different coils to output an adjustable frequency and forms a dynamic scanning electromagnetic induction matrix.

[0044] Step S202: The receiving unit 200 senses the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and outputs the original magnetic field signal.

[0045] Step S203: The data processing unit 300 acquires the original magnetic field signal and performs in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable.

[0046] Step S204: The image integration unit 400 performs image fusion based on spatial location information and material property information to obtain a three-dimensional visualization model and an opening guidance strategy.

[0047] The detection device and method for cable paths within fireproof sealing materials of this invention can locate underground cables during the operation of a nuclear power plant. Based on the generated three-dimensional visualization model and opening guidance strategy, it not only achieves accurate positioning of cable paths and safe opening assessment within the sealing material, but also avoids the problems caused by repeatedly verifying cable positions when manually chiseling away the sealing material. This significantly improves detection efficiency, completely eliminates risks, and enhances the operation and maintenance efficiency of nuclear power plants.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0049] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0050] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A device for detecting cable paths within a fireproof enclosure, characterized in that, include: The transmitting unit is used to sequentially activate different coils to output an adjustable frequency and form a dynamic scanning electromagnetic induction matrix; The receiving unit is used to sense the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and output the original magnetic field signal. A data processing unit is used to acquire the original magnetic field signal and perform in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable. An image integration unit is used to perform image fusion based on the spatial location information and material property information to obtain a three-dimensional visualization model and an opening guidance strategy.

2. The detection device for cable paths within fireproof sealing according to claim 1, characterized in that, The transmitting unit includes: a signal modulation module, a power amplification and compensation module, and an electromagnetic pulse transmitter; The signal modulation module is used to load parameters and generate an excitation signal based on the parameters; The electromagnetic pulse transmitter is used to sequentially activate different coils according to the excitation signal to output an adjustable frequency, forming a dynamic scanning electromagnetic induction matrix, and forming a harmonic magnetic field through the dynamic scanning electromagnetic induction matrix. The power amplification and compensation module is used to monitor the magnetic field strength generated by the secondary current of the receiving unit in real time, and to compensate for the magnetic field loss of the sealing material when the magnetic field strength is lower than a set threshold.

3. The detection device for cable paths within fireproof sealing according to claim 1, characterized in that, The receiving unit includes: a signal receiver, a signal conditioning module, an analog-to-digital conversion module, and a noise reduction module; The signal receiver is used to sense the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix; The signal conditioning module is used to filter the magnetic field strength; The analog-to-digital conversion module is used to perform analog-to-digital conversion on the signal after it has been filtered by the signal conditioning module, and generate a magnetic field strength matrix. The denoising module is used to perform preliminary denoising on the signal of the magnetic field strength matrix to obtain the original magnetic field signal.

4. The detection device for cable paths within fireproof sealing according to claim 3, characterized in that, The signal receiver includes a magnetic field coupling module; the magnetic field coupling module adopts a three-layer coil structure; the three-layer coil structure includes an inner coil, a middle coil, and an outer coil; The inner coil is used to shield against power frequency interference at the nuclear power plant site; The middle layer coil is used to receive the magnetic field strength; The outer coil is used to shield against interference from the primary magnetic field.

5. The detection device for cable paths within fireproof sealing according to claim 1, characterized in that, The data processing unit includes: a deep denoising module, a feature extraction module, a material identification module, and a spatial positioning module; The deep denoising module is used to perform deep denoising on the original magnetic field signal to obtain effective frequency band data; The feature extraction module is used to extract features based on the effective frequency band data to obtain feature data; The material identification module is used to identify materials based on the feature data to obtain the material property information of the target cable. The spatial positioning module is used to locate the target cable based on the effective frequency band data and obtain the spatial location information of the target cable.

6. The detection device for cable paths within fireproof sealing according to claim 5, characterized in that, The deep denoising module includes: a noise removal submodule and a secondary filtering submodule; The noise removal submodule is used to perform multi-resolution decomposition of the original magnetic field signal using wavelet transform, and remove high-frequency noise components based on the distribution differences between noise and effective signal at different scales. The secondary filtering submodule is used to perform frequency domain matching on the signal after high-frequency noise components have been removed based on the secondary magnetic field filter template to obtain the effective frequency band data.

7. The detection device for cable paths within fireproof sealing according to claim 5, characterized in that, The feature extraction module includes: a phase extraction submodule and a quality factor calculation submodule; The phase extraction submodule is used to calculate the magnetic field strength amplitude and relative offset of each sampling point; The quality factor calculation submodule is used to extract the center frequency, half-power bandwidth, and resonant point amplitude, and to calculate the quality factor based on the center frequency and the half-power bandwidth.

8. The detection device for cable paths within fireproof sealing according to claim 7, characterized in that, The material identification module includes: a feature input submodule and an identification submodule; The feature input submodule is used to determine the phase angle corresponding to each sampling point based on the relative offset, and integrate the phase angle corresponding to each sampling point, the amplitude of the resonant point, and the quality factor to obtain the input feature vector; The identification submodule is used to input the input feature vector into a random forest classification model to identify the material type and obtain the material property information of the target cable.

9. The detection device for cable paths within fireproof sealing according to claim 1, characterized in that, The image integration unit includes: a 3D reconstruction module, a material rendering module, and a safety opening area annotation module; The three-dimensional reconstruction module is used to perform three-dimensional spline interpolation and smoothing on discrete cable location points using a spatial quantization model based on the spatial location information to obtain a continuous cable path curve. The thickness parameters of the entrance-side fireproof sealing structure are then superimposed on the continuous cable path curve to generate a three-dimensional spatial trajectory model of the target cable within the sealing layer. The material rendering module is used to perform color rendering on the three-dimensional spatial trajectory model according to the material property information; The safety opening area annotation module is used to annotate the color-rendered 3D spatial trajectory model and output the 3D visualization model and opening guidance strategy.

10. A method for detecting cable paths within fireproof sealing surfaces, characterized in that, include: The transmitting unit sequentially activates different coils to output an adjustable frequency and forms a dynamic scanning electromagnetic induction matrix; The receiving unit senses the magnetic field strength generated by the secondary current formed by the target cable under the excitation of the harmonic magnetic field formed by the dynamic scanning electromagnetic induction matrix, and outputs the original magnetic field signal. The data processing unit acquires the original magnetic field signal and performs in-depth processing and analysis on the original magnetic field signal to obtain the spatial location information and material property information of the target cable; The image integration unit performs image fusion based on the spatial location information and material property information to obtain a three-dimensional visualization model and an opening guidance strategy.

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