Method, device and medium for detecting state parameters of internal steel bars of concrete pole

Abstract

This invention discloses a method, apparatus, and medium for detecting the state parameters of the internal reinforcement of a concrete utility pole. The method includes: placing a pulsed eddy current probe against the surface of the concrete utility pole and scanning it circumferentially, while simultaneously recording the scanning position information in real time using an encoder integrated into the pulsed eddy current probe; obtaining a detection signal; extracting features from the detection signal to obtain signal peak characteristics; and using the post-peak amplitude response segment features of the signal peak characteristics as a first feature quantity and a student... t The peak value of the distribution density function is used as the second feature; based on the two-dimensional linear regression model, the diameter of the steel bar is determined by the first and second feature values.

Description

Technical Field

[0001] This invention relates to the field of concrete testing technology, and in particular to a method, apparatus, and medium for detecting the state parameters of the internal reinforcing steel bars of a concrete pole. Background Technology

[0002] Concrete poles, used as overhead power line supports in industries such as power, telecommunications, iron ore, and petroleum, are widely used due to their high compressive and tensile strength, durability, fire resistance, and seismic resistance. However, during production, some manufacturers may use substandard steel bars with smaller diameters than the design dimensions or spliced ​​together, resulting in parameters such as the diameter of the steel bars and the thickness of the protective layer inside the concrete pole not meeting national design standards. Furthermore, during use, the steel bars are prone to corrosion when exposed to humid environments for extended periods; the cement layer may develop cracks, sandblasting, and hollow areas due to inadequate post-pouring curing or unsuitable temperature and humidity during the curing period. When the steel bar and protective layer structure are severely flawed, the performance of the concrete pole will be significantly reduced, causing structural failure far below its design service life, leading to collapse accidents, affecting the stable operation of the power system, and even endangering public safety. Therefore, it is necessary to regularly inspect the diameter of the steel bars and the thickness of the protective layer in concrete poles.

[0003] Currently, there is no effective means to detect the diameter and distribution of steel bars inside concrete poles. Because reinforced concrete poles have a ring structure with dense steel bar distribution, and also contain internal support rings, spiral reinforcements, etc., there is significant signal interference. The electromagnetic induction steel bar detectors currently used in the construction and bridge industries are not applicable, as their repeatability and detection error cannot meet the requirements.

[0004] Previously, the inspection of the reinforcing steel and protective layer thickness of newly manufactured concrete poles mainly involved selecting a few poles from the same batch for destructive testing. This involved excavating the concrete layer to expose the reinforcing steel and measuring parameters with calipers. While this method provides intuitive and accurate data, it is a destructive test and cannot be used for inspecting poles already in service. Non-destructive testing (NDT) technology, by leveraging various physical fields such as electricity, magnetism, ultrasound, and heat, and their correlation with the physical properties of the workpiece material, can accurately infer internal defects and key parameter information. It is one of the core technologies currently available for effectively inspecting the quality of concrete poles. Existing NDT methods for concrete poles mainly include radar, infrared, and X-ray methods. Radar methods utilize the different reflected echoes generated by the differences in the electromagnetic properties of concrete, reinforcing steel, and air to obtain information about the reinforcing steel and protective layer, but its accuracy in detecting the thickness of the reinforcing steel and protective layer is insufficient. Infrared methods rely on the difference in the thermal transfer coefficients of concrete and reinforcing steel. A high-frequency magnetic field is used to heat the reinforcing steel inside the concrete to change the surface temperature field distribution, and then infrared temperature scanning is used to present the position information of the reinforcing steel. However, due to numerous interference factors, infrared scanning cannot effectively measure the diameter of the reinforcing steel and the thickness of the protective layer. X-ray methods use high-energy rays to penetrate structural components and determine internal information based on the intensity of the reflected signal. However, due to the radiation hazards to humans and the large size and high cost of the equipment, this method is rarely used for inspecting concrete poles. Therefore, there is an urgent need for a non-destructive method to effectively detect the state parameters of the reinforcing steel bars inside concrete.

[0005] Pulsed eddy current technology is feasible for detecting the diameter of reinforcing bars and the thickness of the protective layer in concrete poles. Pulsed eddy current detection technology uses square waves or step excitation methods, avoiding the limitation of traditional eddy currents which can only detect defects on the surface of the equipment. Furthermore, pulsed eddy currents have stronger excitation energy and excellent penetrating power, allowing them to penetrate the protective layer and detect the internal reinforcing bars. Compared to radar detection methods, pulsed eddy current technology is simpler in principle and has lower equipment costs; compared to infrared detection methods, it is easier to operate and has higher detection accuracy; and compared to X-ray detection methods, it is harmless to humans and the environment. Therefore, it has promising applications in the inspection of concrete poles. Summary of the Invention

[0006] Based on this, it is necessary to propose a method, device, and medium for detecting the state parameters of the internal reinforcing steel bars of concrete poles to address the above problems.

[0007] A method for detecting the state parameters of the internal reinforcing steel bars of a concrete utility pole, the method comprising: The pulsed eddy current probe is placed close to the surface of the concrete pole and scanned along the circumference of the pole. At the same time, the encoder integrated into the pulsed eddy current probe records the scanning position information in real time. Obtain the detection signal; Feature extraction is performed on the detected signal to obtain signal peak features; The peak-to-peak amplitude response segment of the signal peak characteristics is used as the first feature, and the student... t The peak characteristics of the distribution density function are used as the second characteristic quantity; Based on a two-dimensional linear regression model, the diameter of the reinforcing bar is determined by the first and second characteristic quantities.

[0008] Preferably, the method further includes: The center position and number of reinforcing bars are determined by the scanning position corresponding to the maximum value of the signal peak feature.

[0009] Preferably, the method further includes: The pulsed eddy current probe is used to obtain the signal peak characteristics corresponding to the area directly above the concrete pole. The thickness of the protective layer is determined by using the signal peak characteristics and combining them with the pre-calibrated amplitude-protective layer thickness relationship curve.

[0010] Preferably, the two-dimensional linear regression model is y = or y = ,in, a 1. a 2 represents the coefficient of the independent variable. b The intercept is... x 1 represents the characteristic value of the amplitude response segment after the peak. x 2 students t Peak characteristics of the distribution density function y The diameter of the reinforcing bar.

[0011] Preferably, the pre-calibrated amplitude-protective layer thickness relationship curve specifically includes: The relationship between the amplitude of the detected signal and the thickness of the protective layer when the pulsed eddy current probe is positioned directly above the concrete pole is pre-calibrated, forming a pre-calibrated amplitude-protective layer thickness relationship curve. Tc = k * Vp + c , Tc For the thickness of the protective layer, Vp The peak value of the signal. k To calibrate the slope of the curve, c To calibrate the curve intercept.

[0012] Preferably, obtaining the detection signal specifically includes: A square wave excitation signal with a specified amplitude, duty cycle and repetition frequency is generated. The square wave excitation signal is amplified and applied to the excitation coil of the pulse eddy current probe to generate pulse eddy currents. The electromagnetic response signal inside the concrete pole is obtained through the receiving coil of the pulsed eddy current probe and converted into a voltage signal; The acquired voltage signal is amplified, filtered, and converted from analog to digital to obtain the detection signal.

[0013] Preferably, the student t The peak value of the distribution density function is used as the second feature quantity, specifically including: Using students t The distribution density function is fitted to the peak characteristics of the signal to obtain the corresponding amplitude; The amplitude is used as the second characteristic quantity.

[0014] A device for detecting the state parameters of internal reinforcing steel bars in concrete utility poles, the device comprising: The pulsed eddy current probe is used to scan the circumference of a concrete pole by closely adhering to its surface. The pulsed eddy current probe integrates an excitation coil, a receiving coil, and an encoder; wherein, the excitation coil is used to apply pulsed eddy current excitation to the pole, the receiving coil is used to acquire electromagnetic response signals and convert them into detection signals, and the encoder is used to record scanning position information in real time; The main unit is connected to the pulsed eddy current probe via a cable; The host unit integrates a data acquisition and control unit for receiving the detection signal from the pulsed eddy current probe; And a data analysis and processing unit, used to extract features from the detected signal, including extracting peak signal features, using the post-peak amplitude response segment features as the first feature quantity, and processing student data. t The peak value of the distribution density function is used as the second characteristic quantity, and the diameter of the steel bar is determined by the first and second characteristic quantities based on a two-dimensional linear regression model.

[0015] Preferably, the host further includes: The signal generation and acquisition dual-function module is used to generate square wave excitation signals and acquire detection signals; The power amplifier module is used to amplify the excitation signal and transmit it to the excitation coil of the probe; The signal amplification module is used to amplify and filter the detection signal output from the receiving coil; The hybrid power supply module is used to power the dual-function signal generation and acquisition module, the power amplification module, and the signal amplification module.

[0016] A computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps: The pulsed eddy current probe is placed close to the surface of the concrete pole and scanned along the circumference of the pole. At the same time, the encoder integrated into the pulsed eddy current probe records the scanning position information in real time. Obtain the detection signal; Feature extraction is performed on the detected signal to obtain signal peak features; The peak-to-peak amplitude response segment of the signal peak characteristics is used as the first feature, and the student... t The peak characteristics of the distribution density function are used as the second characteristic quantity; Based on a two-dimensional linear regression model, the diameter of the reinforcing bar is determined by the first and second characteristic quantities.

[0017] The embodiments of the present invention have the following beneficial effects: This invention employs a pulsed eddy current probe to scan the circumference of the pole and integrates an encoder to record the position, ensuring comprehensiveness and repeatability of the detection and overcoming the limitations of traditional electromagnetic induction instruments with significant signal interference. Secondly, by extracting the post-peak amplitude response segment features as the first feature quantity, it can effectively capture the positive correlation between the rebar diameter and the signal amplitude, while extracting the student... t The peak value of the distribution density function is used as the second feature quantity. Its inverse relationship with the diameter of the steel bar is used to reduce the error caused by the change in the thickness of the concrete cover. Finally, based on the two-dimensional linear regression model, multiple features are integrated to realize the accurate inversion of the steel bar diameter, which improves the intelligence and accuracy of the detection. As a result, the method has the advantages of being portable, efficient and non-destructive, and is suitable for rapid on-site deployment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] in: Figure 1 A flowchart of a method for detecting the state parameters of internal reinforcing bars in a concrete pole, as provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of steel bars of different diameters used in a method for detecting the state parameters of internal steel bars in a concrete pole, as provided in an embodiment of the present invention.

[0020] Figure 3 This invention provides an experiment and results on the distribution of reinforcing bars in a method for detecting the state parameters of internal reinforcing bars in a concrete pole.

[0021] Figure 4This invention provides an embodiment of a method for detecting the state parameters of internal reinforcing bars in concrete poles, which includes an induced voltage curve of the protective layer thickness.

[0022] Figure 5 This invention provides a method for detecting the state parameters of internal reinforcing bars in concrete poles, which includes a calibration curve of the protective layer thickness versus the signal amplitude.

[0023] Figure 6 This invention provides a curve diagram showing the characteristic amplitude response segment after the peak in a method for detecting the state parameters of the internal reinforcing bars of a concrete pole.

[0024] Figure 7 This invention provides a method for detecting the state parameters of internal reinforcing steel bars in concrete utility poles. (For example, this invention provides a method for detecting the state parameters of internal reinforcing steel bars in concrete utility poles.) t A graph of the distribution density function. Detailed Implementation

[0025] 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.

[0026] This invention provides a method for detecting the state parameters of the internal reinforcing steel bars in concrete utility poles, such as... Figure 1 As shown, the method includes: Step 101: Place the pulsed eddy current probe close to the surface of the concrete pole and scan along the circumference of the pole. At the same time, the encoder integrated into the pulsed eddy current probe records the scanning position information in real time. Step 102: Obtain the detection signal; Specifically, a square wave excitation signal with a specified amplitude, duty cycle and repetition frequency is generated. The square wave excitation signal is amplified and applied to the excitation coil of the pulsed eddy current probe to generate pulsed eddy currents. The electromagnetic response signal inside the concrete pole is obtained through the receiving coil of the pulsed eddy current probe and converted into a voltage signal; The acquired voltage signal is amplified, filtered, and converted from analog to digital to obtain the detection signal.

[0027] Step 103: Extract features from the detected signal to obtain signal peak features; Step 104: Take the post-peak amplitude response segment feature of the signal peak characteristics as the first feature quantity, and the student... t The peak characteristics of the distribution density function are used as the second characteristic quantity; Specifically, students t The signal is fitted with a distribution density function to obtain the corresponding amplitude; the amplitude is then used as the second feature.

[0028] The students t The probability density function is:

[0029] Where x is the amplitude of the fitted signal; ν is the degree of freedom, which is related to the defect peaks and noise pulses in the signal. The more defect peaks and noise pulses there are, the smaller the value of ν becomes; μ is the position parameter, corresponding to the center of the signal amplitude; σ is the scale parameter, reflecting the degree of dispersion of the signal amplitude; and Γ is the gamma function. During fitting, the values ​​of these parameters are the optimal values ​​selected by the software based on the principle of maximizing fitting accuracy, and the feature quantity uses the value of x.

[0030] Step 105: Based on the two-dimensional linear regression model, determine the diameter of the reinforcing bar using the first and second feature quantities.

[0031] Specifically, the two-dimensional linear regression model is y = or y = ,in, a 1. a 2 represents the coefficient of the independent variable. b The intercept is... x 1 represents the characteristic value of the amplitude response segment after the peak. x 2 students t Peak characteristics of the distribution density function y The diameter of the reinforcing bar.

[0032] Furthermore, the method also includes: determining the center position and distribution quantity of the reinforcing bars by using the scanning position corresponding to the maximum value of the signal peak feature.

[0033] Specifically, after acquiring all circumferential detection signals, based on the characteristic that the amplitude of the pulse eddy current signal is sensitive to the distribution of the reinforcing bars, the amplitude characteristics of all scanning position signals are extracted, and the position with the largest amplitude is the location of the center of the reinforcing bar.

[0034] The number of distributions is determined by the number of the largest amplitudes; that is, a peak in the signal represents a steel bar.

[0035] Furthermore, the method also includes: acquiring the signal peak characteristics corresponding to the area directly above the concrete pole through the pulsed eddy current probe; and determining the protective layer thickness by combining the signal peak characteristics with a pre-calibrated amplitude-protective layer thickness relationship curve.

[0036] Specifically, the relationship between the amplitude of the detected signal and the thickness of the protective layer when the pulsed eddy current probe is located directly above the concrete pole is pre-calibrated, forming a pre-calibrated amplitude-protective layer thickness relationship curve. Tc = k * Vp + c , Tc For the thickness of the protective layer, Vp The peak value of the signal. k To calibrate the curve slope, characterizing the sensitivity of the amplitude characteristic quantity for protective layer thickness assessment; c The calibrated curve intercept characterizes the inherent baseline drift of the feature quantity and is used to guide the design of the offset in the algorithm (input is 0, output is 0).

[0037] This invention employs a pulsed eddy current probe to scan the circumference of the pole and integrates an encoder to record the position, ensuring comprehensiveness and repeatability of the detection and overcoming the limitations of traditional electromagnetic induction instruments with significant signal interference. Secondly, by extracting the post-peak amplitude response segment features as the first feature quantity, it can effectively capture the positive correlation between the rebar diameter and the signal amplitude, while extracting the student... t The peak value of the distribution density function is used as the second feature quantity. Its inverse relationship with the diameter of the steel bar is used to reduce the error caused by the change in the thickness of the concrete cover. Finally, based on the two-dimensional linear regression model, multiple features are integrated to realize the accurate inversion of the steel bar diameter, which improves the intelligence and accuracy of the detection. As a result, the method has the advantages of being portable, efficient and non-destructive, and is suitable for rapid on-site deployment.

[0038] Example: To illustrate the specific implementation process of this invention, an experimental platform was constructed, mainly consisting of a pulsed eddy current detection system, a three-dimensional scanning table, and rebar specimens. The three-dimensional scanning table is used to hold the probe and drive it to scan along the X and Y axes to simulate the scanning process of the probe on a utility pole. Simultaneously, considering that the protective layer is a non-conductive medium, the probe is moved along the Z axis using the three-dimensional scanning table. By adjusting the perpendicular distance between the probe and the rebar, the states of protective layers with different thicknesses are simulated. Furthermore, the rebar used in this invention is as follows... Figure 2 As shown, its diameter dimensions are shown in Table 1.

[0039] Table 1 Dimensions of Reinforcing Steel Specimens

[0040] For the reinforcement distribution experiment: the probe is moved along by the three-dimensional scanning table. y The axis is used to scan the reinforcing bars and acquire detection signals. The amplitude of all detection signals is extracted, and the location coordinates of the position with the maximum amplitude are selected as the location of the reinforcing bar. By obtaining the locations of all reinforcing bars, the distribution of reinforcing bars in the concrete pole can be obtained.

[0041] like Figure 3 An experiment was conducted on a 24.3 mm diameter rebar (rebar number 1) to obtain the amplitude of the detection signal. The probe's starting coordinate was set to 0, and the ending coordinate was set to 50 mm. The rebar was located at 25 mm, and the scanning step was 0.5 mm. As shown in the figure, the signal amplitude at the red dot is significantly higher than that at other locations. The position information at the red dot was read as 25 mm, which coincides with the actual center of the rebar. This demonstrates that using signal amplitude as a feature quantity can accurately obtain the rebar's position information, and thus determine its distribution.

[0042] For the protective layer thickness experiment: the probe was placed directly above the rebar, and the distance between the probe and the rebar was adjusted using a 3D scanning stage to simulate different protective layer thicknesses. When the protective layer thickness was 15 mm, 20 mm, and 25 mm, the pulsed eddy current detection signals were as follows: Figure 4 As shown in the figure, there is a significant correlation between signal amplitude and protective layer thickness. Figure 5 As shown.

[0043] To further quantify this relationship, the two are fitted to obtain a calibration equation for the protective layer thickness. From Figure 5 It can be seen that the amplitude of the detection signal exhibits a good linear relationship with the thickness of the protective layer, which can be described as: T c =-276.24× Vp +266.36 (1) in, T c For the thickness of the protective layer, Vp To detect the peak value of the signal.

[0044] In the actual testing process, after acquiring the detection signal, the peak value of the signal is extracted, and then substituted into equation (1) to obtain the thickness of the protective layer corresponding to the detection signal. For example, when the thickness of the protective layer is 23 mm, the peak value of the obtained detection signal voltage is 0.88V. Substituting it into equation (1), the thickness of the protective layer can be calculated to be 23.27 mm. The relative error between this and the true value of 23 mm is 1.2%, which is small and within a reasonable range.

[0045] For the rebar diameter test experiment: with a protective layer thickness of 15 mm, rebars with diameters of 24.3, 19.5, 17.0, 13.5, 8.9, and 7 mm were tested, and the obtained signals are as follows: Figure 6As shown, observations reveal that the peak values ​​of all signals occur around 0.015s, but there is no significant correlation between the peak values ​​and the rebar diameter. Therefore, the peak value cannot be used to assess the rebar diameter. However, in the signal segment following the peak value (0.017–0.022s), known as the "post-peak amplitude response segment," the signal amplitude is positively correlated with the rebar diameter; that is, the larger the diameter, the higher the amplitude. Therefore, this invention uses the amplitude of the "post-peak amplitude response segment" as the first characteristic quantity.

[0046] In this implementation case, the signal at 0.02 was selected for analysis. The characteristic values ​​corresponding to the six different diameter steel bars are 0.872452, 0.871086, 0.869331, 0.865128, 0.853073, and 0.846634V, respectively.

[0047] In addition, the "student" approach is adopted. t The detection signal is fitted using the "distribution density function", and the result is as follows: Figure 7 As shown in the figure, the peak value is inversely proportional to the diameter of the reinforcing bar; that is, the larger the diameter, the lower the peak value of the density function. Therefore, this invention will... t The magnitude of the distribution density function is used as the second characteristic.

[0048] In this implementation case, the students corresponding to the six different diameter steel bars... t The magnitudes of the distribution density functions are: 0.921454592, 0.924001415, 0.926556836, 0.928552218, 0.938873226, and 0.942001883.

[0049] Furthermore, to further reduce quantitative errors, two-dimensional linear regression is used to fuse these two feature quantities. In this implementation case, two-dimensional linear regression is performed on steel bars with diameters of 24.3, 19.5, 13.5, 8.9, and 7 mm and their two types of feature quantities to obtain the calibration equation; and steel bars with a diameter of 17.0 mm and their feature quantities are used as tests to verify the prediction accuracy of the steel bar diameter. The calibration equation is as follows: y =-954.5345× x 1-1958.0231× x 2+2660.0120(2) Substituting the characteristic quantities 0.869331 and 0.926556836 corresponding to the 17.0 mm diameter steel bar into equation (2), we obtain that the steel bar diameter is 16.0, and the relative error between it and its true value of 17.0 is 5.88%.

[0050] It is evident that the method of the present invention can evaluate the diameter of the reinforcing bars relatively accurately.

[0051] This invention also provides a device for detecting the state parameters of the internal reinforcement of concrete poles, the device comprising: The pulsed eddy current probe is used to scan the circumference of a concrete pole by closely adhering to its surface. The pulsed eddy current probe integrates an excitation coil, a receiving coil, and an encoder; wherein, the excitation coil is used to apply pulsed eddy current excitation to the pole, the receiving coil is used to acquire electromagnetic response signals and convert them into detection signals, and the encoder is used to record scanning position information in real time; The main unit is connected to the pulsed eddy current probe via a cable; The host unit integrates a data acquisition and control unit for receiving the detection signal from the pulsed eddy current probe; And a data analysis and processing unit, used to extract features from the detected signal, including extracting peak signal features, using the post-peak amplitude response segment features as the first feature quantity, and processing student data. t The peak value of the distribution density function is used as the second characteristic quantity, and the diameter of the steel bar is determined by the first and second characteristic quantities based on a two-dimensional linear regression model.

[0052] Furthermore, the host also includes: The signal generation and acquisition dual-function module is used to generate square wave excitation signals and acquire detection signals; The power amplifier module is used to amplify the excitation signal and transmit it to the excitation coil of the probe; The signal amplification module is used to amplify and filter the detection signal output from the receiving coil; The hybrid power supply module is used to power the dual-function signal generation and acquisition module, the power amplification module, and the signal amplification module.

[0053] This invention also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps: Step 101: Place the pulsed eddy current probe close to the surface of the concrete pole and scan along the circumference of the pole. At the same time, the encoder integrated into the pulsed eddy current probe records the scanning position information in real time. Step 102: Obtain the detection signal; Step 103: Extract features from the detected signal to obtain signal peak features; Step 104: Take the post-peak amplitude response segment feature of the signal peak characteristics as the first feature quantity, and the student... t The peak characteristics of the distribution density function are used as the second characteristic quantity; Step 105: Based on the two-dimensional linear regression model, determine the diameter of the reinforcing bar using the first and second feature quantities.

[0054] This invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps: Step 101: Place the pulsed eddy current probe close to the surface of the concrete pole and scan along the circumference of the pole. At the same time, the encoder integrated into the pulsed eddy current probe records the scanning position information in real time. Step 102: Obtain the detection signal; Step 103: Extract features from the detected signal to obtain signal peak features; Step 104: Take the post-peak amplitude response segment feature of the signal peak characteristics as the first feature quantity, and the student... t The peak characteristics of the distribution density function are used as the second characteristic quantity; Step 105: Based on the two-dimensional linear regression model, determine the diameter of the reinforcing bar using the first and second feature quantities.

[0055] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for detecting a state parameter of a steel bar inside a concrete pole, characterized by, The method includes: The pulsed eddy current probe is placed close to the surface of the concrete pole and scanned along the circumference of the pole. At the same time, the encoder integrated into the pulsed eddy current probe records the scanning position information in real time. Obtain the detection signal; Feature extraction is performed on the detected signal to obtain signal peak features; The peak post-amplitude response segment feature of the signal peak value feature is taken as a first feature quantity, and the student t distribution density function peak value feature is taken as a second feature quantity; Based on a two-dimensional linear regression model, the diameter of the reinforcing bar is determined by the first and second characteristic quantities.

2. The method of claim 1, wherein The method further includes: The center position and number of reinforcing bars are determined by the scanning position corresponding to the maximum value of the signal peak feature.

3. The method of claim 1 or 2, wherein The method further includes: The pulsed eddy current probe is used to obtain the signal peak characteristics corresponding to the area directly above the concrete pole. The thickness of the protective layer is determined by using the signal peak characteristics and combining them with the pre-calibrated amplitude-protective layer thickness relationship curve.

4. The method for detecting the state parameters of the internal reinforcement of concrete poles according to claim 3, characterized in that, The two-dimensional linear regression model is as follows: y = or y = ,in, a 1. a 2 represents the coefficient of the independent variable. b The intercept is... x 1 represents the characteristic value of the amplitude response segment after the peak. x 2 students t Peak characteristics of the distribution density function y The diameter of the reinforcing bar.

5. The method for detecting the state parameters of the internal reinforcement of a concrete pole according to claim 4, characterized in that, The pre-calibrated amplitude-protective layer thickness relationship curve specifically includes: The relationship between the amplitude of the detected signal and the thickness of the protective layer when the pulsed eddy current probe is positioned directly above the concrete pole is pre-calibrated, forming a pre-calibrated amplitude-protective layer thickness relationship curve. Tc = k * Vp + c , Tc For the thickness of the protective layer, Vp The peak value of the signal. k To calibrate the slope of the curve, c To calibrate the curve intercept.

6. The method for detecting the state parameters of the internal reinforcing steel bars of a concrete pole according to claim 5, characterized in that, The acquisition of the detection signal specifically includes: A square wave excitation signal with a specified amplitude, duty cycle and repetition frequency is generated. The square wave excitation signal is amplified and applied to the excitation coil of the pulse eddy current probe to generate pulse eddy currents. The electromagnetic response signal inside the concrete pole is obtained through the receiving coil of the pulsed eddy current probe and converted into a voltage signal; The acquired voltage signal is amplified, filtered, and converted from analog to digital to obtain the detection signal.

7. The method for detecting the state parameters of the internal reinforcing steel bars of a concrete pole according to claim 6, characterized in that, The students t The peak value of the distribution density function is used as the second feature quantity, specifically including: Use students t The distribution density function is fitted to the peak characteristics of the signal to obtain the corresponding amplitude; The amplitude is used as the second characteristic quantity.

8. A device for detecting the state parameters of internal reinforcing steel bars in a concrete utility pole, characterized in that, The device includes: The pulsed eddy current probe is used to scan the circumference of a concrete pole by closely adhering to its surface. The pulsed eddy current probe integrates an excitation coil, a receiving coil, and an encoder; wherein, the excitation coil is used to apply pulsed eddy current excitation to the pole, the receiving coil is used to acquire electromagnetic response signals and convert them into detection signals, and the encoder is used to record scanning position information in real time; The main unit is connected to the pulsed eddy current probe via a cable; The host unit integrates a data acquisition and control unit for receiving the detection signal from the pulsed eddy current probe; And a data analysis and processing unit, used to extract features from the detected signal, including extracting peak signal features, using the post-peak amplitude response segment features as the first feature quantity, and processing student data. t The peak value of the distribution density function is used as the second characteristic quantity, and the diameter of the steel bar is determined by the first and second characteristic quantities based on a two-dimensional linear regression model.

9. The device for detecting the state parameters of internal reinforcing steel bars in concrete poles according to claim 8, characterized in that, The host also includes: The signal generation and acquisition dual-function module is used to generate square wave excitation signals and acquire detection signals; The power amplifier module is used to amplify the excitation signal and transmit it to the excitation coil of the probe; The signal amplification module is used to amplify and filter the detection signal output from the receiving coil; The hybrid power supply module is used to power the dual-function signal generation and acquisition module, the power amplification module, and the signal amplification module.

10. A computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the steps of the method as claimed in any one of claims 1 to 7.

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