Metal pipeline damage detection acquisition device based on composite probe and analysis method

Abstract

This invention relates to a metal pipe damage detection and acquisition device and analysis method based on a composite probe, belonging to the technical field of metal composite pipe damage detection. The composite probe includes an integrated electromagnetic ultrasonic probe and a pulsed eddy current detection probe. The electromagnetic ultrasonic probe is a self-excited and self-testing spiral coil; the pulsed eddy current detection probe is a TR probe where the excitation coil and detection coil are not coaxial. The detection and acquisition device includes an electromagnetic ultrasonic-pulsed eddy current composite probe, a signal generator, a multiplexer, an electromagnet, and a filter amplifier. This invention, through the combination of the electromagnetic ultrasonic-pulsed eddy current composite probe, signal generator, multiplexer, and electromagnet, realizes three detection modes of the detection and acquisition device, thereby achieving integrated detection of typical damage such as carbon steel outer layer thinning and stainless steel inner lining collapse, significantly simplifying the detection process and improving detection efficiency.

Description

Technical Field

[0001] This invention belongs to the field of metal composite pipe damage detection technology, and specifically relates to a metal pipe damage detection and acquisition device and analysis method based on a composite probe. Background Technology

[0002] Bimetallic composite pipes are pipes consisting of a carbon steel outer structural pipe and a stainless steel inner lining functional pipe, with the two layers bonded together without welding. Due to their excellent corrosion resistance and mechanical properties, they are widely used in onshore and subsea oil and gas transportation. However, during long-term service, the outer ferromagnetic material often experiences localized thinning defects due to flow corrosion and bubble collapse corrosion. Simultaneously, due to manufacturing defects and significant differences in the thermal expansion coefficients of the base pipe and the lining, the inner lining of the bimetallic composite pipe may collapse. Further expansion of the collapse can lead to corrosion of the base pipe by the transported medium, causing the base pipe to rupture, resulting in major production safety accidents and huge economic losses. Therefore, developing effective non-destructive testing methods for defects in multi-layered metal structures is crucial to ensuring their safe operation. However, current inspections of bimetallic composite pipes are mostly limited to detecting single defects. In actual production, however, pipelines often face the dual risks of outer carbon steel thinning and inner stainless steel lining collapse simultaneously. Therefore, it is crucial to develop a new inspection technology based on integrity management to achieve integrated detection of outer layer thinning and inner lining collapse in bimetallic composite pipes.

[0003] In the detection of thinning of the outer wall of bimetallic composite pipes, electromagnetic ultrasound has become a highly regarded electromagnetic non-destructive testing method in in-service pipeline inspection / monitoring due to its non-contact nature, lack of coupling agent requirement, and rapid detection capabilities. Meanwhile, pulsed eddy current testing, with its advantages of large penetration depth, low power consumption, high detection efficiency, and rich information content, also provides favorable support for measuring the thickness of the outer carbon steel wall. Utilizing both electromagnetic ultrasound and pulsed eddy current methods to detect the outer carbon steel wall thickness not only achieves the determination of the outer carbon steel thickness but also effectively eliminates the influence of external interference factors such as environmental factors and equipment noise on the experimental results, enabling mutual verification and significantly improving the reliability of the detection.

[0004] In the detection of lining collapse in bimetallic composite pipes, traditional ultrasonic testing, magnetic flux leakage testing, and radiographic testing can only be used to inspect single-layer industrial pipelines. Furthermore, because the two layers of the bimetallic composite pipe are only bonded together without welding, the magnetic permeability of the two metal materials differs significantly, resulting in substantial magnetic resistance at the interface. This makes it difficult for the magnetic field to penetrate the carbon steel layer to reach the stainless steel layer, thus preventing the use of conventional eddy current or pulsed eddy current testing. The magnetic saturation pulsed eddy current testing method is employed to detect lining collapse. This method utilizes an electromagnet to generate a strong magnetic field that magnetizes the outer carbon steel layer until it reaches magnetic saturation, reducing the magnetic permeability of the outer carbon steel layer. This overcomes the interlayer magnetic resistance, allowing the induced eddy current to penetrate deeply into the inner stainless steel layer of the bimetallic composite pipe. Simultaneously, by increasing the skin depth, the detection capability of the pulsed eddy current testing method is enhanced, thereby achieving accurate detection of lining collapse.

[0005] Furthermore, during inspection, especially for detecting lining collapse, the thinning of the outer carbon steel layer—that is, the thickness of the outer carbon steel layer—can interfere with the detection of the degree of lining collapse. Determining the thickness of the outer carbon steel layer first helps to eliminate this interference. By combining the advantages of both technologies, integrated detection of thinning and lining collapse in bimetallic composite pipes is achieved, providing strong assurance for the safe operation of pipelines. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a metal pipe damage detection and acquisition device and analysis method based on a composite probe.

[0007] The first objective of this invention is to provide an electromagnetic ultrasound-pulse eddy current composite probe, comprising an electromagnetic ultrasound probe and a pulse eddy current detection probe, wherein the electromagnetic ultrasound probe, the pulse eddy current detection probe, and the magnetic yoke are integrated into a single design.

[0008] The electromagnetic ultrasonic probe is a self-excited and self-testing spiral coil; the pulsed eddy current detection probe is a TR probe in which the excitation coil and the detection coil are not coaxial.

[0009] In a specific embodiment of the present invention, a wear-resistant layer is provided between the pulsed eddy current detection probe and the electromagnetic ultrasonic probe.

[0010] The second objective of this invention is to provide a metal pipe damage detection and acquisition device based on a composite probe, including the aforementioned electromagnetic ultrasonic-pulse eddy current composite probe, signal generator, multiplexer, electromagnet, and filter amplifier.

[0011] The signal generator is connected to the excitation coils of the electromagnetic ultrasonic probe and the pulse eddy current detection probe in the electromagnetic ultrasonic-pulse eddy current composite probe via a multiplexer switch.

[0012] The multiplexer and the electromagnetic ultrasonic probe are connected in sequence via a power amplifier circuit, a duplexer, and an impedance matching circuit. The power amplifier circuit is located near the multiplexer, and the electromagnetic ultrasonic probe is connected to the impedance matching circuit.

[0013] The input terminal of the filter amplifier is connected to the detection coil of the duplexer and the pulse eddy current detection probe, respectively, and the output terminal of the filter amplifier is connected to the signal acquisition card.

[0014] The electromagnet excitation module is connected to the electromagnet.

[0015] In a specific embodiment of the present invention, the electromagnet excitation module is used to adjust the on / off state of the excitation source, the magnitude of the excitation voltage or the excitation current.

[0016] In a specific embodiment of the present invention, when detecting and acquiring signals, the electromagnetic ultrasonic probe in the electromagnetic ultrasonic-pulse eddy current composite probe contacts the surface of the test piece, and the pulse eddy current detection probe in the electromagnetic ultrasonic-pulse eddy current composite probe is located on the side of the electromagnetic ultrasonic probe away from the surface of the test piece.

[0017] In a specific embodiment of the present invention, a wear-resistant layer is provided between the electromagnetic ultrasonic probe and the surface of the test piece.

[0018] In a specific embodiment of the present invention, when detecting and acquiring signals, the electromagnet covers the electromagnetic ultrasonic-pulse eddy current composite probe.

[0019] In a specific embodiment of the present invention, a shielding layer is provided between the electromagnet and the electromagnetic ultrasonic-pulse eddy current composite probe.

[0020] The third objective of this invention is to provide a method for acquiring damage detection signals in metal pipes based on a composite probe, implemented using the aforementioned detection and acquisition device, comprising:

[0021] Electromagnetic ultrasonic test signal acquisition: The electromagnet is activated through the electromagnet excitation module; the electromagnetic ultrasonic probe and signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe are connected through the multiplexer switch; the electromagnetic ultrasonic test signal of the test piece is acquired.

[0022] The pulsed eddy current detection signal is acquired by: disconnecting the electromagnet through the electromagnet excitation module; connecting the pulsed eddy current probe and the signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe through a multiplexer; and acquiring the pulsed eddy current detection signal of the test piece.

[0023] In a specific embodiment of the present invention, the method for acquiring damage detection signals in metal pipes based on a composite probe further includes:

[0024] The detection and acquisition of magnetic saturation pulsed eddy current detection signals are performed as follows: the electromagnet is activated through the electromagnet excitation module; the pulsed eddy current probe and the signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe are connected through the multiplexer switch; and the magnetic saturation pulsed eddy current detection signals of the test piece are detected and acquired.

[0025] In a specific embodiment of the present invention, during the process of detecting and acquiring the magnetically saturated pulsed eddy current detection signal, before connecting the pulsed eddy current probe and the signal generator in the electromagnetic ultrasound-pulsed eddy current composite probe via a multiplexer switch, the following is further included:

[0026] Based on the designed wall thickness of the test piece, the excitation parameters of the electromagnet are set through the electromagnet excitation module;

[0027] Set the excitation parameters of the magnetic saturation pulse eddy current signal according to the final test wall thickness of the test piece;

[0028] Set the parameters of the filter amplifier;

[0029] Configure the parameters of the signal acquisition card.

[0030] In a specific embodiment of the present invention, during the process of detecting and acquiring electromagnetic ultrasonic detection signals, before connecting the electromagnetic ultrasonic probe and the signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe via a multiplexer switch, the method further includes:

[0031] Based on the designed wall thickness of the test piece, the excitation parameters of the electromagnet are set through the electromagnet excitation module;

[0032] The excitation parameters of the electromagnetic ultrasonic pulse signal are set according to the design wall thickness of the test piece;

[0033] Set the parameters of the filter amplifier;

[0034] Configure the parameters of the signal acquisition card.

[0035] In a specific embodiment of the present invention, the detection and acquisition of the pulsed eddy current detection signal, before connecting the pulsed eddy current probe and the signal generator in the electromagnetic ultrasound-pulsed eddy current composite probe via a multiplexer switch, further includes:

[0036] Set the excitation parameters of the pulsed eddy current signal according to the design wall thickness of the test piece;

[0037] Set the parameters of the filter amplifier;

[0038] Configure the parameters of the signal acquisition card.

[0039] The fourth objective of this invention is to provide an analytical method for metal pipe damage, implemented based on the aforementioned detection and acquisition device, comprising:

[0040] Electromagnetic ultrasonic pulse signals and pulsed eddy current signals were collected from calibration specimens with different wall thicknesses;

[0041] Collect electromagnetic ultrasonic test signals and pulsed eddy current test signals of the specimen to be analyzed;

[0042] The electromagnetic ultrasonic calibration curve for different wall thicknesses is determined based on the electromagnetic ultrasonic pulse signals of the calibration specimens.

[0043] Based on the pulsed eddy current signals of calibration specimens with different wall thicknesses, determine the pulsed eddy current calibration curve for each wall thickness.

[0044] The electromagnetic ultrasonic wall thickness of the specimen to be analyzed is determined based on the electromagnetic ultrasonic calibration curve and electromagnetic ultrasonic detection signal of the wall thickness.

[0045] Based on the pulsed eddy current calibration curve and pulsed eddy current detection signal of the wall thickness, the pulsed eddy current wall thickness of the specimen to be analyzed is determined.

[0046] In a specific embodiment of the present invention, it further includes:

[0047] Based on the electromagnetic ultrasonic wall thickness, pulsed eddy current wall thickness, and design wall thickness of the specimen to be analyzed, determine whether the specimen to be analyzed has thinning damage.

[0048] In a specific embodiment of the present invention, the method for analyzing metal pipe damage further includes:

[0049] Collect magnetic saturation pulse eddy current signals of calibration components with different collapse degrees under different wall thicknesses;

[0050] Collect magnetic saturation pulsed eddy current signals of the specimen to be analyzed;

[0051] Based on the magnetic saturation pulse eddy current signals of calibration components with different degrees of collapse under different wall thicknesses, the calibration curves for different degrees of collapse under different wall thicknesses are determined.

[0052] Based on the magnetic saturation pulsed eddy current signal of the specimen to be analyzed, and the calibration curves of different collapse degrees under different wall thicknesses, it is determined whether the specimen to be analyzed has collapse damage and the degree of collapse.

[0053] In a specific embodiment of the present invention, determining whether the specimen under analysis has collapse damage and the degree of collapse based on the magnetic saturation pulsed eddy current signal of the specimen under analysis and calibration curves of different collapse degrees under different wall thicknesses includes:

[0054] The magnetic saturation pulse eddy current signal of the test piece was processed sequentially using low-pass filtering, independent component analysis, and Gaussian filtering.

[0055] Adaptive feature extraction is performed on the processed magnetically saturated pulsed eddy current signal;

[0056] Based on the result that the late correlation coefficient obtained by adaptive extraction is a predetermined value, it is determined that the test specimen does not have collapse damage;

[0057] Based on the result that the late correlation coefficient obtained by adaptive extraction is less than the predetermined value, the late correlation coefficient obtained by adaptive extraction is substituted into the calibration curves of different collapse degrees under different wall thicknesses to obtain the collapse degree of the test specimen.

[0058] The fifth objective of this invention is to provide an analysis system for metal pipe damage, based on the aforementioned detection and acquisition device, comprising:

[0059] Collection module: used to collect electromagnetic ultrasonic pulse signals and pulsed eddy current signals of calibration specimens with different wall thicknesses, as well as electromagnetic ultrasonic detection signals and pulsed eddy current detection signals of the test specimens;

[0060] Calibration module: used to determine the electromagnetic ultrasonic calibration curve of the wall thickness based on the electromagnetic ultrasonic pulse signal of the calibration specimen with different wall thickness, and to determine the pulse eddy current calibration curve of the wall thickness based on the pulse eddy current signal of the calibration specimen with different wall thickness.

[0061] Analysis module: used to determine the electromagnetic ultrasonic wall thickness of the specimen to be analyzed based on the electromagnetic ultrasonic calibration curve and electromagnetic ultrasonic detection signal based on the wall thickness; and to determine the pulsed eddy current wall thickness of the specimen to be analyzed based on the pulsed eddy current calibration curve and pulsed eddy current detection signal based on the wall thickness.

[0062] In a specific embodiment of the present invention, the collection module is further used to collect the magnetic saturation pulse eddy current signals of calibration parts with different degrees of collapse under different wall thicknesses and the magnetic saturation pulse eddy current signals of the test piece.

[0063] The calibration module is also used to determine calibration curves for different degrees of collapse under different wall thicknesses based on the magnetic saturation pulse eddy current signals of calibration components with different degrees of collapse under different wall thicknesses.

[0064] The analysis module is also used to determine whether the specimen under analysis has thinning damage based on the electromagnetic ultrasonic wall thickness, pulsed eddy current wall thickness and design wall thickness; it is also used to determine whether the specimen under analysis has collapse damage and the degree of collapse based on the magnetic saturation pulsed eddy current signal of the specimen under analysis and the calibration curves of different collapse degrees under different wall thicknesses.

[0065] A sixth object of the present invention is to provide an electronic device comprising: a processor coupled to a memory;

[0066] The memory is used to store computer programs;

[0067] The processor is configured to execute the computer program stored in the memory, so that the electronic device performs the aforementioned method for analyzing metal pipe damage.

[0068] A seventh object of the present invention is a computer-readable storage medium storing a program or instructions that, when executed on a computer, cause the computer to perform the metal pipe damage analysis method as described above.

[0069] The beneficial effects of this invention are:

[0070] The metal pipe damage detection and acquisition device and analysis method based on a composite probe of the present invention have the following advantages:

[0071] An integrated composite probe, including an electromagnetic ultrasonic probe and a pulsed eddy current detection probe, was set up, laying the foundation for subsequent detection and flaw detection of typical damage (thinning and lining collapse) of composite metal pipes. Its setup greatly simplifies the detection process.

[0072] A metal pipe damage detection and acquisition device based on an integrated composite probe was established. By combining the composite probe, electromagnetic ultrasonic-pulse eddy current composite probe, signal generator, multiplexer, and electromagnet, three detection modes (electromagnetic ultrasonic detection and acquisition mode, pulse eddy current detection and acquisition mode, and magnetic saturation pulse eddy current detection and acquisition mode) were realized. The three detection modes do not affect each other, and the control is simple. Furthermore, the device can be used to detect two types of potential typical key damages in bimetallic composite pipes: thinning of the outer carbon steel layer and collapse of the inner stainless steel lining. This method uses a single detection system and an integrated detection probe, which significantly simplifies the detection process and improves detection efficiency.

[0073] Among them, the electromagnetic ultrasonic detection acquisition mode and the pulsed eddy current detection acquisition mode are used to detect the thickness of the outer carbon steel wall and whether the outer carbon steel has undergone thinning damage. When applied to detect the thickness of the outer carbon steel wall, the detection results of the two modes can be mutually verified, which improves the reliability of the results.

[0074] The magnetic saturation pulsed eddy current detection acquisition mode is applied to the detection of the degree of lining collapse. This mode realizes the acquisition of the pulsed eddy current signal of the inner carbon steel layer, which is not affected by the outer carbon steel layer, thus improving the accuracy of the detection of inner layer collapse damage.

[0075] Furthermore, the adjustable electromagnet used in the device of the present invention has significant advantages over traditional permanent magnets. First, it can freely control the presence and magnitude of the external magnetic field. Second, by adjusting the presence or absence of the external magnetic field, the electromagnet can be easily moved, avoiding problems such as the difficulty of system movement caused by the strong attraction between the permanent magnet and the test piece, as well as potential damage to the coil.

[0076] Finally, before inspecting for lining collapse, it is crucial to first confirm whether the thickness of the outer carbon steel layer has been reduced. This step is because:

[0077] The thinning of the outer carbon steel layer directly affects the accurate assessment of lining collapse. Specifically, if the outer carbon steel layer is thinned, the detection signal will be interfered with during the testing process, thus masking or misleading the true extent of lining collapse. To ensure accurate and interference-free detection of lining collapse, the thickness of the outer carbon steel layer must first be confirmed to select the correct calibration curve and eliminate the potential negative impact of thinning on the test results, thereby enabling accurate judgment and analysis of lining collapse.

[0078] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0079] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0080] Figure 1 A schematic diagram of an electromagnetic ultrasound-pulse eddy current composite probe according to an embodiment of the present invention is shown. Figure 1 Figure a is a schematic diagram of the combined detection of an electromagnetic ultrasonic-pulse eddy current composite probe and an electromagnet. Figure 1 Figure b is one of the assembly diagrams of an electromagnetic ultrasound and pulsed eddy current probe. Figure 1 Figure C is one of the assembly diagrams of an electromagnetic ultrasound and pulsed eddy current probe. Figure 1 In the diagram, d represents a schematic of an electromagnetic ultrasonic probe.

[0081] Figure 2 A schematic diagram of a metal pipe damage detection and acquisition device based on a composite probe according to an embodiment of the present invention is shown.

[0082] Figure 3 A schematic diagram of a bimetallic composite pipe containing wall thinning and lining collapse according to an embodiment of the present invention is shown.

[0083] Figure 4 The electromagnetic ultrasonic calibration curve of the wall thickness according to an embodiment of the present invention is shown;

[0084] Figure 5The pulsed eddy current calibration curve for wall thickness according to an embodiment of the present invention is shown;

[0085] Figure 6 The diagram shows the calibration curve obtained by fitting the test specimen of the bimetallic composite tube according to an embodiment of the present invention. Figure 6 In the figure, 'a' represents the fitted calibration curve obtained from the testing of an 8mm carbon steel + 2mm stainless steel calibration component. Figure 6 In the figure, b represents the fitted calibration curve obtained from the testing of a 10mm carbon steel + 2mm stainless steel calibration component. Figure 6 In the figure, c represents the fitted calibration curve obtained from the testing of a calibrator made of 12mm carbon steel and 2mm stainless steel.

[0086] Figure 7 A framework diagram of a metal pipe damage analysis system according to an embodiment of the present invention is shown;

[0087] Figure 8 A frame diagram of an electronic device according to an embodiment of the present invention is shown;

[0088] In the diagram: Collection module 10; Calibration module 20; Analysis module 30; Electronic device 300; Processor 301; Memory 302. Detailed Implementation

[0089] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0090] like Figure 1 As shown, an electromagnetic ultrasound-pulse eddy current composite probe according to an embodiment of the present invention includes an electromagnetic ultrasound probe and a pulse eddy current detection probe, wherein the electromagnetic ultrasound probe, the pulse eddy current detection probe and the magnetic yoke are integrated into a single design.

[0091] The electromagnetic ultrasonic probe is a self-excited and self-testing spiral coil, such as... Figure 1 As shown in d; the pulsed eddy current detection probe is a TR probe in which the excitation coil and the detection coil are not coaxial, as shown in d. Figure 1 As shown in c.

[0092] In some embodiments of the present invention, such as Figure 1As shown in Figure b, a wear-resistant layer is provided between the pulsed eddy current detection probe and the electromagnetic ultrasonic probe to avoid contact between the pulsed eddy current detection probe and the electromagnetic ultrasonic probe, which would cause damage to both probes. The material of the wear-resistant layer is a commonly used material in this technical field, and is not limited in this invention.

[0093] When the electromagnetic ultrasonic-pulsed eddy current composite probe of this invention is used in combination with an electromagnet, it can detect pipe wall thinning damage and / or lining collapse damage in metal pipes. Specifically, when detecting pipe wall thinning damage and / or lining collapse damage:

[0094] Place the electromagnet on the outer wall of the bimetallic composite pipe test piece at the test location;

[0095] The electromagnetic ultrasonic-pulse eddy current detection composite probe is then placed between the electromagnet and the bimetallic composite tube, and closely attached to the outer wall of the bimetallic composite tube at the point to be tested.

[0096] Furthermore, ensure that the pulsed eddy current detection probe in the electromagnetic ultrasound-pulse eddy current composite probe is located on the side of the electromagnetic ultrasound probe away from the detection point, that is, ensure that the pulsed eddy current detection probe is directly above the electromagnetic ultrasound probe. Figure 1 As shown in Figure a.

[0097] In some embodiments of the present invention, the specific parameters of the electromagnetic ultrasonic probe are as follows: 40-60 turns, wire diameter 0.2-0.5mm, and one coil layer;

[0098] The pulsed eddy current probe is a TR probe in which the excitation coil and the detection coil are not coaxial. Its specific parameters are as follows: excitation coil inner diameter 10-14mm, outer diameter 22-35mm, height 14-25mm, wire diameter 0.5-1.0mm, reference number of turns 250-900 turns; detection coil inner diameter 4-10mm, outer diameter 10-15mm, height 10-20mm, wire diameter 0.05-0.5mm, reference number of turns 3000-20000 turns; excitation coil core bottom diameter 8-12mm, height 14-25mm; detection coil core bottom diameter 4-10mm, height 10-20mm.

[0099] In some embodiments of the present invention, for example, the electromagnet is a horseshoe-shaped electromagnet. During detection, the electromagnetic ultrasonic-pulse eddy current composite probe is placed in the horseshoe-shaped groove of the electromagnet and fixed in place to avoid interference with the signal caused by probe vibration, thereby improving the stability of the detection signal and detection results. Figure 1 As shown in Figure a.

[0100] like Figure 2As shown, a metal pipe damage detection and acquisition device based on a composite probe according to an embodiment of the present invention includes the aforementioned electromagnetic ultrasonic-pulse eddy current composite probe, a signal generator, a multiplexer, an electromagnet, a filter amplifier, and an electromagnet excitation module.

[0101] The signal generator is connected to the excitation coils of the electromagnetic ultrasonic probe and the pulse eddy current detection probe in the electromagnetic ultrasonic-pulse eddy current composite probe via a multiplexer switch.

[0102] The multiplexer and the electromagnetic ultrasonic probe are connected in sequence via a power amplifier circuit, a duplexer, and an impedance matching circuit. The power amplifier circuit is located near the multiplexer, and the electromagnetic ultrasonic probe is connected to the impedance matching circuit.

[0103] The input terminal of the filter amplifier is connected to the detection coil of the duplexer and the pulse eddy current detection probe, respectively, and the output terminal of the filter amplifier is connected to the signal acquisition card.

[0104] The electromagnet excitation module is connected to the electromagnet;

[0105] In this embodiment of the invention, the electromagnet excitation module is used to adjust the on / off state of the excitation source, the magnitude of the excitation voltage or excitation current, thereby controlling the presence and magnitude of the magnetic field, and thus enabling the electromagnet to be used in different detection environments.

[0106] By using the path of the excitation source, the electromagnet is turned on to provide the necessary bias magnetic field for the electromagnetic ultrasonic detection mode, and the electromagnetic ultrasonic probe is turned on. At this time, the excitation voltage or excitation current of the electromagnet does not need to be set too high. The bias magnetic field strength can reach about 1-1.5T. This enables the detection of the outer pipe wall thickness using electromagnetic ultrasonic pulse signals. During the process, the excitation parameters of the electromagnet can be adjusted through the electromagnet excitation module.

[0107] By disconnecting the excitation source, turning off the electromagnet, and connecting the pulsed eddy current detection probe, the outer pipe wall thickness can be detected using pulsed eddy current signals.

[0108] This enables mutual verification of two detection methods for outer pipe wall thickness: electromagnetic ultrasound and pulsed eddy current, as well as the detection of pipe wall thinning damage.

[0109] By utilizing the excitation source path, an electromagnet is connected, along with a pulsed eddy current detection probe. In this mode, the electromagnet provides a strong magnetic field to magnetize the outer carbon steel layer of the test piece until magnetic saturation. To achieve this, a relatively high electromagnet excitation voltage or current needs to be set so that the applied magnetic field strength reaches 2-2.5T. Magnetic saturation is the phenomenon where the magnetic induction intensity of a ferromagnetic material rapidly increases and tends to saturate under the action of an applied magnetic field. At the same time, the relative permeability of the ferromagnetic material also increases first with the increase of the applied magnetic field, and then rapidly decreases to a minimum. Therefore, magnetizing the outer carbon steel layer reduces its relative permeability to be close to that of the inner stainless steel layer, thereby reducing the influence of interfacial magnetic resistance and allowing the magnetic field to penetrate through the carbon steel layer to the stainless steel layer and generate eddy currents. In addition, reducing the skin effect of eddy currents and increasing the skin depth enhances the detection capability of pulsed eddy current detection, thereby realizing the signal of the bimetallic pipe lining and ultimately realizing the detection of collapse damage of the metal pipe lining.

[0110] In some embodiments of the present invention, when detecting and acquiring signals, the electromagnetic ultrasonic probe in the electromagnetic ultrasonic-pulse eddy current composite probe contacts the surface of the test piece, and the pulse eddy current detection probe in the electromagnetic ultrasonic-pulse eddy current composite probe is located on the side of the electromagnetic ultrasonic probe away from the surface of the test piece.

[0111] In some embodiments of the present invention, such as Figure 1 As shown in Figure b, a wear-resistant layer is provided between the electromagnetic ultrasonic probe and the surface of the test piece to avoid damage to the electromagnetic ultrasonic probe caused by contact between the electromagnetic ultrasonic probe and the surface of the test piece.

[0112] In some embodiments of the present invention, when detecting and acquiring signals, the electromagnet covers the electromagnetic ultrasonic-pulse eddy current composite probe.

[0113] In some embodiments of the present invention, when detecting and acquiring signals, a shielding layer is provided between the electromagnet and the electromagnetic ultrasound-pulse eddy current composite probe to prevent the influence of external magnetic fields on the electromagnetic ultrasound pulse signal.

[0114] In some embodiments of the present invention, the signal acquisition card is connected to a laptop computer.

[0115] In some embodiments of the present invention, the laptop computer shown is equipped with a metal pipe damage analysis system (see the embodiments below for details), which is used to analyze the signals collected by the acquisition card about the test piece to be analyzed, and to identify whether the test piece to be analyzed has typical damage (thinning, lining collapse).

[0116] In some embodiments of the present invention, the signal generator is connected to control software, and the control software is also connected to an electromagnet excitation module.

[0117] In the above embodiments of the present invention, the signal generator, the multiplexer, the power amplifier circuit, and the impedance matching circuit are all well-known technologies in the art, and will not be described in detail here.

[0118] The metal pipe damage detection and acquisition device based on a composite probe of the present invention is a detection device that integrates detection and real-time signal acquisition. Furthermore, through the combination of an electromagnetic ultrasonic-pulse eddy current composite probe, a signal generator, a multiplexer switch, and an electromagnet, the device achieves mutual control of three detection and acquisition modes. The three detection and acquisition modes are as follows:

[0119] Electromagnetic ultrasonic testing and acquisition mode: When the electromagnet is turned on, the connection between the electromagnetic ultrasonic probe and the signal generator is turned on. At this time, the testing and acquisition device is in the electromagnetic ultrasonic testing and acquisition mode. In this mode, the magnetic field generated by the high-frequency current in the electromagnetic ultrasonic probe and the bias magnetic field are superimposed to form the magnetic field of EMAT change. The ultrasonic wave propagates inside the test piece at the wave speed Ce, and is then reflected back at the interface between the test piece and the air, and this process is repeated continuously inside the test piece.

[0120] Pulse eddy current detection acquisition mode: Turn off the electromagnet and connect the pulse eddy current probe (i.e., the detection coil of the pulse eddy current detection probe) to the signal generator. At this time, the detection acquisition device is in the pulse eddy current detection acquisition mode. In this mode, only pulse eddy currents are generated inside the specimen, and no ultrasonic waves are excited.

[0121] Magnetic saturation pulsed eddy current detection acquisition mode: When the electromagnet is turned on, the pulsed eddy current probe (i.e., the detection coil of the pulsed eddy current detection probe) is connected to the signal generator. At this time, the detection acquisition device is in the magnetic saturation pulsed eddy current detection acquisition mode. In this mode, the electromagnet provides a strong magnetic field to magnetize the outer carbon steel of the test piece until it is magnetically saturated, which means that it magnetizes the outer carbon steel, reduces the relative permeability of the outer carbon steel, and approaches the relative permeability of the inner stainless steel material. This reduces the influence of the magnetic resistance between the interfaces, allowing the magnetic field to penetrate through the carbon steel layer to the stainless steel layer and generate eddy currents. In addition, it reduces the skin effect of the eddy currents, increases the skin depth, enhances the detection capability of pulsed eddy current detection, and thus obtains the pulsed eddy current signal of the inner carbon steel that is not affected by the outer carbon steel, improving the accuracy of inner layer collapse damage detection.

[0122] According to an embodiment of the present invention, a method for acquiring signals for metal pipe damage detection based on a composite probe is implemented using the detection and acquisition device described in the above embodiment (i.e., using the electromagnetic ultrasonic detection and acquisition mode and the pulsed eddy current detection and acquisition mode of the detection and acquisition device described in the above embodiment), comprising:

[0123] A. Detection and acquisition of electromagnetic ultrasonic detection signals (corresponding to the electromagnetic ultrasonic detection and acquisition mode using the detection and acquisition device in the above embodiment):

[0124] A-1. Connect the electromagnet through the electromagnet excitation module;

[0125] A-2. Connect the electromagnetic ultrasound probe and the signal generator in the electromagnetic ultrasound-pulse eddy current composite probe through a multiplexer;

[0126] A-3. Detect and collect electromagnetic ultrasonic test signals of the test piece;

[0127] B. Detection and acquisition of pulsed eddy current detection signals (corresponding to the pulsed eddy current detection and acquisition mode of the detection and acquisition device used in the above embodiment):

[0128] B-1. Disconnect the electromagnet via the electromagnet excitation module;

[0129] B-3. ​​Connect the pulsed eddy current probe and the signal generator in the electromagnetic ultrasound-pulse eddy current composite probe through a multiplexer;

[0130] B-3. ​​Detect and collect the pulsed eddy current detection signal of the test piece.

[0131] In some embodiments of the present invention, the method for acquiring damage detection signals in metal pipes based on a composite probe further includes:

[0132] C. Detection and acquisition of magnetic saturation pulse eddy current detection signals (corresponding to the magnetic saturation pulse eddy current detection and acquisition mode using the detection and acquisition device in the above embodiment):

[0133] C-1. Connect the electromagnet through the electromagnet excitation module;

[0134] C-2. Connect the pulsed eddy current probe and the signal generator in the electromagnetic ultrasound-pulse eddy current composite probe through a multiplexer;

[0135] C-3. Detect and collect the magnetic saturation pulse eddy current detection signal of the test piece.

[0136] In some embodiments of the present invention, during the process of detecting and acquiring the magnetic saturation pulse eddy current detection signal, a parameter setting step DC is included before step C-2, specifically as follows:

[0137] DC-1: Based on the design wall thickness of the test piece, set the excitation parameters of the electromagnet through the electromagnet excitation module.

[0138] DC-2. Based on the final test wall thickness of the test piece (obtained through mutual verification of the electromagnetic ultrasonic wall thickness and the pulsed eddy current wall thickness of the test piece), set the excitation parameters of the magnetic saturation pulsed eddy current signal.

[0139] DC-3, set the parameters of the filter amplifier;

[0140] DC-4, set the parameters of the signal acquisition card.

[0141] In some embodiments of the present invention, during the process of detecting and acquiring electromagnetic ultrasonic detection signals, a parameter setting step DA is included before step A-2, specifically as follows:

[0142] DA-1. Based on the designed wall thickness of the test piece, set the excitation parameters of the electromagnet through the electromagnet excitation module;

[0143] DA-2. Set the excitation parameters of the electromagnetic ultrasonic pulse signal according to the design wall thickness of the test piece;

[0144] DA-3, Set the parameters of the filter amplifier;

[0145] DA-4, Set the parameters of the signal acquisition card.

[0146] In some embodiments of the present invention, the detection and acquisition of the pulsed eddy current detection signal, before step B-2, further includes a parameter setting step DB, specifically:

[0147] DB-1. Set the excitation parameters of the pulsed eddy current signal according to the design wall thickness of the test piece;

[0148] DB-2, Set the parameters of the filter amplifier;

[0149] DB-3, Configure the parameters of the signal acquisition card.

[0150] In the above embodiments, the excitation parameters of the electromagnet include parameters such as excitation source voltage, duty cycle, and frequency;

[0151] The test parameters of the electromagnetic ultrasonic pulse signal include signal excitation frequency, wavenumber, output level, amplification factor, and repetition frequency. The excitation frequency is generally set to 3.5MHz.

[0152] The test parameters of the pulsed eddy current signal include waveform, excitation frequency, excitation amplitude, and excitation wavenumber;

[0153] The parameters of the filter amplifier include the amplification factor and the bandpass filter frequency, wherein the bandpass filter frequency is generally set to 1-5MHz;

[0154] The parameters of the signal acquisition card include sampling frequency and cutoff voltage.

[0155] In the above embodiments, how to set the excitation parameters of the electromagnet according to the design wall thickness of the test piece through the electromagnet excitation module in steps DC-1 and DA-1 is well known in the art, and will not be described in detail here.

[0156] In the above embodiment, how to set the test parameters of the electromagnetic ultrasonic pulse signal according to the design wall thickness of the test piece in step DA-2 is well known in the art, and will not be described in detail here.

[0157] In the above embodiment, how to set the test parameters of the pulsed eddy current signal according to the final test wall thickness of the test piece in step DC-2 is well known in the art, and will not be described in detail here.

[0158] In the above embodiment, how to set the test parameters of the pulsed eddy current signal according to the design wall thickness of the test piece in step DB-1 is well known in the art, and will not be described in detail here.

[0159] A method for analyzing damage to metal pipes according to an embodiment of the present invention, implemented based on the detection and acquisition device described above, includes:

[0160] S1. Collect electromagnetic ultrasonic pulse signals and pulsed eddy current signals of calibration specimens with different wall thicknesses;

[0161] S2. Collect electromagnetic ultrasonic detection signals and pulsed eddy current detection signals of the specimen to be analyzed;

[0162] S3. Determine the electromagnetic ultrasonic calibration curve for the wall thickness based on the electromagnetic ultrasonic pulse signals of the calibration specimens with different wall thicknesses.

[0163] S4. Determine the pulse eddy current calibration curve for the wall thickness based on the pulse eddy current signals of the calibration specimens with different wall thicknesses.

[0164] S5. Based on the electromagnetic ultrasonic calibration curve and electromagnetic ultrasonic detection signal of the wall thickness, determine the electromagnetic ultrasonic wall thickness of the specimen to be analyzed.

[0165] S6. Based on the pulsed eddy current calibration curve and pulsed eddy current detection signal of the wall thickness, determine the pulsed eddy current wall thickness of the specimen to be analyzed.

[0166] S7. Based on the electromagnetic ultrasonic wall thickness, pulsed eddy current wall thickness, and design wall thickness of the specimen to be analyzed, determine whether the specimen to be analyzed has thinning damage.

[0167] In this embodiment of the invention, the electromagnetic ultrasonic pulse signal and pulsed eddy current signal of the calibration specimens with different wall thicknesses in step S1 are obtained by using the detection and acquisition device in the above embodiment of the invention, that is, repeating steps A and B, except that the test specimens in the steps are replaced with calibration specimens with different wall thicknesses.

[0168] In this embodiment of the invention, the electromagnetic ultrasonic detection signal and pulsed eddy current detection signal of the test specimen are analyzed in step S2, that is, they are obtained by using the detection and acquisition device in the above embodiment of the invention. That is, steps A and B are repeated, except that the test specimen in the steps is replaced with the test specimen to be analyzed.

[0169] In some embodiments of the present invention, step S7 includes:

[0170] S7-1. Based on the electromagnetic ultrasonic wall thickness and pulsed eddy current wall thickness of the specimen to be analyzed, the final test wall thickness of the specimen to be analyzed is obtained.

[0171] S7-2. Based on the comparison between the final tested wall thickness and the designed wall thickness of the specimen to be analyzed, determine whether the specimen to be analyzed has thinning damage, specifically including:

[0172] If the final test wall thickness of the specimen to be analyzed is less than the design wall thickness, then the specimen to be analyzed has thinning damage.

[0173] If the final test wall thickness of the specimen to be analyzed is not less than the design wall thickness, then the specimen to be analyzed is free from thinning damage.

[0174] In some embodiments of the present invention, step S7-1 specifically includes:

[0175] The pulsed eddy current wall thickness of the specimen to be analyzed is used as the value to be verified, and the electromagnetic ultrasonic wall thickness of the specimen to be analyzed is used as the verification value.

[0176] If the error between the two is within the threshold, the value to be verified will be used as the final test value and the result will be considered accurate.

[0177] The threshold is, for example, 1%;

[0178] If the error between the two exceeds the threshold, the pulse eddy current detection acquisition mode is used again to obtain the pulse eddy current wall thickness until the value to be verified is verified and confirmed as the final test value.

[0179] In some embodiments of the present invention, the method for analyzing damage to metal pipes further includes:

[0180] X1. Collect magnetic saturation pulse eddy current signals of calibration components with different collapse degrees under different wall thicknesses;

[0181] X2. Collect the magnetic saturation pulse eddy current signal of the specimen to be analyzed;

[0182] X3. Based on the magnetic saturation pulse eddy current signals of calibration components with different degrees of collapse under different wall thicknesses, determine the calibration curves for different degrees of collapse under different wall thicknesses.

[0183] X4. Based on the magnetic saturation pulsed eddy current signal of the specimen to be analyzed, and the calibration curves of different collapse degrees under different wall thicknesses, determine whether the specimen to be analyzed has collapse damage and the degree of collapse.

[0184] In this embodiment of the invention, the magnetic saturation pulse eddy current signals of the calibration pieces with different collapse degrees under different wall thicknesses in step X1 are obtained by using the detection and acquisition device in the above embodiment of the invention. That is, step C is repeated, except that the test piece in the step is replaced with the calibration pieces with different collapse degrees under different wall thicknesses.

[0185] In this embodiment of the invention, the magnetic saturation pulse eddy current signal of the specimen to be analyzed in step X2 is obtained by using the detection and acquisition device in the above embodiment of the invention, that is, step C is repeated, except that the specimen to be tested in the step is replaced with the specimen to be analyzed.

[0186] In some embodiments of the present invention, step X4 includes:

[0187] X4-1. The magnetic saturation pulse eddy current signal of the test piece is processed sequentially using low-pass filtering, independent component analysis, and Gaussian filtering.

[0188] X4-2. Adaptive extraction of feature quantities from the processed magnetically saturated pulse eddy current signal;

[0189] X4-3. Based on the result that the late correlation coefficient obtained by adaptive extraction is a predetermined value, it is determined that there is no collapse damage in the test piece;

[0190] X4-4. Based on the result that the late correlation coefficient obtained by adaptive extraction is less than the predetermined value, the late correlation coefficient obtained by adaptive extraction is substituted into the calibration curve of different collapse degrees under different wall thicknesses to obtain the collapse degree of the test specimen.

[0191] Based on the apparatus and analysis method described in the above embodiments, the following embodiments illustrate the detection process and data analysis process for a specific test specimen. The test specimen, calibration specimen, and analysis specimen are all exemplarily bimetallic composite pipes. A schematic diagram of the structure of the bimetallic composite pipe containing wall thinning and lining collapse is shown below. Figure 3 As shown.

[0192] Testing process:

[0193] I. Electromagnetic ultrasonic detection acquisition mode using the device described in the above embodiment: Place the electromagnetic ultrasonic-pulse eddy current composite probe on the part of the bimetallic composite tube calibration specimen to be analyzed (or tested), specifically as follows: Figure 2 The contact and settings are as shown. The electromagnetic ultrasonic testing acquisition mode is activated, parameters are set, and a series of bimetallic composite pipe calibration specimens with different outer carbon steel thicknesses are tested to obtain electromagnetic ultrasonic echo signals (i.e., the first electromagnetic ultrasonic test signal) for each calibration specimen. The bimetallic composite pipe calibration specimens are stepped plates with thicknesses of 8mm, 10mm, 12mm, and 14mm. The wall thickness value T of each calibration specimen is recorded during the testing process. 1i The corresponding echo signal time difference Δti ;

[0194] II. Electromagnetic ultrasonic detection acquisition mode using the device in the above embodiment: Place the electromagnetic ultrasonic-pulse eddy current composite probe at the analysis point (or detection point) of the bimetallic composite tube to be analyzed, and place it in the same way as in step one. Start the electromagnetic ultrasonic detection acquisition mode, set the parameters, detect the bimetallic composite tube to be analyzed, and obtain the electromagnetic ultrasonic echo signal (i.e., the second electromagnetic ultrasonic detection signal) of the bimetallic composite tube to be analyzed.

[0195] III. Pulse Eddy Current Detection Acquisition Mode Using the Device in the Above Embodiments: Place the electromagnetic ultrasonic-pulse eddy current composite probe on the analysis site (or detection site) of the bimetallic composite tube calibration specimen, as in step one. Start the pulse eddy current detection acquisition mode, set the parameters, and obtain the pulse eddy current detection signals (i.e., the first pulse eddy current detection signal) for different calibration specimens. The bimetallic composite tube calibration specimens are stepped plates with thicknesses of 8mm, 10mm, 12mm, and 14mm. During the detection process, record the wall thickness value T of each calibration specimen. 2i Its corresponding thickness angle θ i ;

[0196] IV. Pulse eddy current detection acquisition mode using the device in the above embodiment: Place the electromagnetic ultrasound-pulse eddy current composite probe at the analysis point (or detection point) of the bimetallic composite tube to be analyzed, and place it in the same way as in step one. Start the pulse eddy current detection acquisition mode, set the parameters, and obtain the pulse eddy current detection signal (i.e., the second pulse eddy current detection signal) of the bimetallic composite tube to be analyzed.

[0197] V. Magnetic Saturation Pulse Eddy Current Detection and Acquisition Mode Using the Device in the Above Embodiments: Place the electromagnetic ultrasonic-pulse eddy current composite probe at the analysis site (or detection site) of bimetallic composite tube calibration specimens with different wall thicknesses and different degrees of collapse. The specific placement is the same as in step one. Start the magnetic saturation pulse eddy current detection and acquisition mode, set the parameters, and obtain the magnetic saturation pulse eddy current detection signals (i.e., the first magnetic saturation pulse eddy current detection signal) of different calibration specimens. The bimetallic composite tube calibration specimens with different wall thicknesses and different degrees of collapse include: 8mm carbon steel + 2mm stainless steel, 10mm carbon... The test involves metal pipes consisting of steel + 2mm stainless steel and 12mm carbon steel + 2mm stainless steel. The degree of collapse, i.e., the distance of collapse between the carbon steel and stainless steel layers, includes 0mm, 2mm, 4mm, 6mm, 8mm, and 10mm. The testing procedure is as follows: First, 20 consecutive measurements are taken on a calibration specimen with a collapse of 0mm under a certain outer carbon steel wall thickness. Then, the specimen is successively placed on calibration specimens with the same outer carbon steel wall thickness and collapses of 2mm, 4mm, 6mm, 8mm, and 10mm, and 20 consecutive measurements are taken on each specimen. The above steps are repeated, and the collapse value d of the inner lining of each calibration specimen is recorded. iIts corresponding late-stage correlation coefficient ρ i That is, the magnetic saturation pulse eddy current detection signal (first magnetic saturation pulse eddy current detection signal) with different lining collapse degrees under different outer carbon steel wall thickness values ​​is obtained. The reason for multiple and repeated measurements is to prove the stability of the method of the present invention.

[0198] VI. Using the magnetic saturation pulse eddy current detection acquisition mode of the device in the above embodiment: Place the electromagnetic ultrasound-pulse eddy current composite probe at the analysis point (or detection point) of the bimetallic composite tube to be analyzed, and place it as in step one. Start the magnetic saturation pulse eddy current detection acquisition mode, set the parameters, and obtain the magnetic saturation pulse eddy current detection signal (i.e., the second magnetic saturation pulse eddy current detection signal) of the bimetallic composite tube to be analyzed.

[0199] Data processing and analysis process:

[0200] I. Determining the electromagnetic ultrasonic calibration curve for wall thickness:

[0201] The wall thickness T of each calibration specimen in the first electromagnetic ultrasonic test signal 1i The corresponding echo signal time difference Δt i Based on the data, a calibration curve T1 = f(Δt) was plotted between the wall thickness and the time difference of the echo signal. The specific calibration curve is shown in the figure. Figure 4 As shown.

[0202] II. Determining the electromagnetic ultrasonic wall thickness of the bimetallic composite tube to be analyzed:

[0203] After the second electromagnetic ultrasonic test signal is bandpass filtered to obtain the electromagnetic ultrasonic signal Uc1(t) of the test piece, the time difference Δt of the received echo signal is calculated, and the result is substituted into the calibration curve T1=f(Δt) to calculate the wall thickness h1 of the test piece.

[0204] III. Determine the pulsed eddy current calibration curve for wall thickness;

[0205] Based on the wall thickness T in the first pulse eddy current detection signal 2i Its corresponding thickness angle θ i Based on the data, a calibration curve T2 = f(θ) is plotted between the wall thickness T2 and the thickness angle θ. The specific calibration curve is shown in the figure. Figure 5 As shown;

[0206] IV. Determining the pulsed eddy current wall thickness of the bimetallic composite tube to be analyzed:

[0207] Independent component analysis and Gaussian filtering were used to sequentially analyze the second pulse eddy current detection signal U. e0 (t) is processed to eliminate high-frequency noise, power frequency interference, and random noise in the signal, resulting in the filtered pulsed eddy current detection signal U. e1 (t);

[0208] It has been found through research that the thickness angle corresponding to the straight-line segment in the late stage of the pulsed eddy current detection signal after denoising processing, that is, the angle between the perpendicular line of this straight-line segment passing through the origin and the time axis, is closely related to the wall thickness of carbon steel. Therefore, in this invention, the thickness angle θ of the late-stage signal of pulsed eddy current is selected as the characteristic value, and a method for adaptively extracting this characteristic value based on the Hough transform is developed; subsequently, the detected thickness angle characteristic value θ is substituted into the calibration curve T2 = f(θ) to obtain the pulsed eddy current wall thickness h2 of the bimetal composite pipe for analysis;

[0209] V. Determine whether there is thinning damage to the bimetal composite pipe to be analyzed based on the electromagnetic ultrasonic wall thickness h1, pulsed eddy current wall thickness h2, and designed wall thickness h0 of the bimetal composite pipe to be analyzed:

[0210] Taking h2 as the value to be verified and h1 as the verification value, calculate the error between the two, compare the relationship between the error and the threshold value. If the error is within the threshold value, take h2 as the final wall thickness h3 of the bimetal composite pipe;

[0211] Compare h3 and h0. If h3 < h0, then there is thinning damage to the bimetal composite pipe.

[0212] VI. Determine the calibration curves for different collapse degrees at different wall thicknesses:

[0213] Perform data analysis on the different lining collapse degree values and the late-stage correlation coefficient ρ in the first magnetically saturated pulsed eddy current detection signal to obtain multiple calibration curves d n = f n (ρ), as Figure 6 shown;

[0214] VII. Determine whether there is collapse damage to the bimetal composite pipe to be analyzed and the degree of collapse:

[0215] Use low-pass filtering, independent component analysis, and Gaussian filtering to process the second magnetically saturated pulsed eddy current detection signal U p0 (t) in sequence to eliminate the high-frequency noise, power frequency interference, and random noise in the signal respectively, and obtain the filtered pulsed eddy current detection signal U p1 (t);

[0216] Research has revealed that the late correlation coefficient of a portion of the pulsed eddy current detection signal at the end of the signal after noise reduction, i.e., the detection signal without collapse is used as the reference signal, and the Pearson correlation coefficient between other detection signals and the reference signal is closely related to the degree of lining collapse. Therefore, this invention selects the late correlation coefficient ρ of the pulsed eddy current signal as a feature value and develops an adaptive method for extracting this feature value. Subsequently, the late correlation coefficient ρ feature value obtained by detection is substituted into the collapse degree calibration curve d=f(ρ) under the corresponding outer carbon steel wall thickness to obtain the late correlation coefficient ρ.

[0217] If the late correlation coefficient ρ is equal to a predetermined value (exemplarily 1), it is determined that there is no lining collapse at the analysis site of the bimetallic composite pipe.

[0218] Based on the fact that the late correlation coefficient ρ is less than a predetermined value (exemplarily 1), ρ is substituted into the calibration curve d. n =f n (ρ) represents the degree of collapse of the test specimen;

[0219] Specifically, the test results obtained on the calibration specimen in the embodiments of the present invention are as follows: Figure 6 As shown, and its corresponding fitted curve. Figure 6 a, Figure 6 b, Figure 6 As shown in Figure c, the correlation coefficient in the later stage gradually decreases as the degree of collapse increases, indicating that the analysis method of this embodiment can effectively detect the collapse of the inner lining of bimetallic composite pipes.

[0220] Bimetallic composite pipes often face the dual risks of thinning of the outer carbon steel layer and collapse of the inner stainless steel lining during service. However, current inspection methods for bimetallic composite pipes are mostly limited to detecting single defects. The apparatus and analysis method of this invention can achieve accurate detection of lining collapse damage in bimetallic composite pipes under thinning conditions. The specific detection process is as follows:

[0221] First, the wall thickness of the outer carbon steel layer of the bimetallic composite pipe is detected using two detection methods, electromagnetic ultrasound and pulsed eddy current, as described in this invention. The detection results are then cross-verified and compared with the designed wall thickness of the test piece to determine whether the test piece has a thinned wall.

[0222] After the thickness of the outer carbon steel layer is determined, the degree of collapse of the inner lining of the test piece is detected by the magnetic saturation pulse eddy current detection method. This is to prevent the misjudgment of the degree of collapse of the inner lining due to the thinning of the outer carbon steel layer, and to achieve quantitative characterization of the degree of collapse of the inner lining in the range of 0-10mm.

[0223] In the above process, the control of the electromagnet is crucial. When detecting the thickness of the outer pipe wall, the electromagnet is in both on and off states. The function of turning on the electromagnet is to provide the necessary bias magnetic field for the electromagnetic ultrasonic testing method. Subsequently, the outer pipe wall thickness is detected using the pulsed eddy current testing method, which does not require an external magnetic field, so the electromagnet is turned off. After the thickness value of the outer carbon steel is confirmed, the detection of inner lining collapse is performed. The electromagnet is turned on again, and the strong magnetic field provided by the electromagnet is used to magnetize the outer carbon steel of the bimetallic composite pipe until magnetic saturation. That is, the magnetic saturation pulsed eddy current testing technology is used to detect the bimetallic composite pipe, ultimately realizing the integrated detection of two types of defects, making the pipeline inspection more comprehensive.

[0224] like Figure 7 As shown, according to the present invention, a metal pipe damage analysis system based on a composite probe is implemented based on the detection and acquisition device of the above embodiment, comprising:

[0225] Collection module 10: used to collect electromagnetic ultrasonic pulse signals and pulsed eddy current signals of calibration specimens with different wall thicknesses, and electromagnetic ultrasonic detection signals and pulsed eddy current detection signals of the test specimens.

[0226] Calibration module 20: used to determine the electromagnetic ultrasonic calibration curve of the wall thickness based on the electromagnetic ultrasonic pulse signal of the calibration specimen with different wall thickness, and to determine the pulse eddy current calibration curve of the wall thickness based on the pulse eddy current signal of the calibration specimen with different wall thickness.

[0227] Analysis module 30: used to determine the electromagnetic ultrasonic wall thickness of the specimen to be analyzed based on the electromagnetic ultrasonic calibration curve and electromagnetic ultrasonic detection signal based on the wall thickness; and to determine the pulsed eddy current wall thickness of the specimen to be analyzed based on the pulsed eddy current calibration curve and pulsed eddy current detection signal based on the wall thickness.

[0228] In some embodiments of the present invention, the analysis module 30 is further configured to determine whether the specimen to be analyzed has thinning damage based on the electromagnetic ultrasonic wall thickness, pulsed eddy current wall thickness and design wall thickness.

[0229] In some embodiments of the present invention, the metal pipe damage analysis system based on composite probe, wherein the collection module 10 is further used to collect magnetic saturation pulse eddy current signals of calibration parts with different degrees of collapse under different wall thicknesses and magnetic saturation pulse eddy current signals of the test piece.

[0230] The calibration module 20 is also used to determine the calibration curves for different degrees of collapse under different wall thicknesses based on the magnetic saturation pulse eddy current signals of calibration components with different degrees of collapse under different wall thicknesses.

[0231] The analysis module 30 is also used to determine whether the specimen under analysis has collapse damage and the degree of collapse based on the magnetic saturation pulse eddy current signal of the specimen under analysis and the calibration curves of different collapse degrees under different wall thicknesses.

[0232] like Figure 8 As shown, in some embodiments of the present invention, an electronic device is provided, the electronic device 300 including: a processor 301 coupled to a memory 302;

[0233] The memory 302 is used to store computer programs;

[0234] The processor 301 is configured to execute the computer program stored in the memory 302, so that the electronic device performs the method described in the above embodiments.

[0235] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic ultrasound-pulsed eddy current composite probe, characterized in that, It includes an electromagnetic ultrasonic probe and a pulsed eddy current detection probe, wherein the electromagnetic ultrasonic probe, the pulsed eddy current detection probe and the magnetic yoke are integrated into a single design. The electromagnetic ultrasonic probe is a self-excited and self-testing spiral coil; the pulsed eddy current detection probe is a TR probe in which the excitation coil and the detection coil are not coaxial.

2. The electromagnetic ultrasound-pulse eddy current composite probe according to claim 1, characterized in that, A wear-resistant layer is provided between the pulsed eddy current detection probe and the electromagnetic ultrasonic probe.

3. A metal pipe damage detection and acquisition device based on a composite probe, characterized in that, Includes the electromagnetic ultrasound-pulse eddy current composite probe, signal generator, multiplexer, electromagnet, filter amplifier, and electromagnet excitation module as described in claim 1 or 2; The signal generator is connected to the excitation coils of the electromagnetic ultrasonic probe and the pulse eddy current detection probe in the electromagnetic ultrasonic-pulse eddy current composite probe via a multiplexer switch. The multiplexer and the electromagnetic ultrasonic probe are connected in sequence via a power amplifier circuit, a duplexer, and an impedance matching circuit. The power amplifier circuit is located near the multiplexer, and the electromagnetic ultrasonic probe is connected to the impedance matching circuit. The input terminal of the filter amplifier is connected to the detection coil of the duplexer and the pulse eddy current detection probe, respectively, and the output terminal of the filter amplifier is connected to the signal acquisition card. The electromagnet excitation module is connected to the electromagnet.

4. The metal pipe damage detection and acquisition device based on a composite probe according to claim 3, characterized in that, The electromagnet excitation module is used to adjust the on / off state of the excitation source, the magnitude of the excitation voltage or the excitation current.

5. The metal pipe damage detection and acquisition device based on a composite probe according to claim 3, characterized in that, When detecting and acquiring signals, the electromagnetic ultrasonic probe in the electromagnetic ultrasonic-pulse eddy current composite probe contacts the surface of the test piece, and the pulse eddy current detection probe in the electromagnetic ultrasonic-pulse eddy current composite probe is located on the side of the electromagnetic ultrasonic probe away from the surface of the test piece.

6. The metal pipe damage detection and acquisition device based on a composite probe according to any one of claims 3-5, characterized in that, When detecting and acquiring signals, the electromagnet covers the electromagnetic ultrasonic-pulse eddy current composite probe.

7. The metal pipe damage detection and acquisition device based on a composite probe according to claim 6, characterized in that, A shielding layer is provided between the electromagnet and the electromagnetic ultrasonic-pulse eddy current composite probe.

8. A method for acquiring damage detection signals in metal pipes based on a composite probe, characterized in that, Based on the detection and acquisition device according to any one of claims 3-7, it includes: Electromagnetic ultrasonic test signal acquisition: The electromagnet is activated through the electromagnet excitation module; the electromagnetic ultrasonic probe and signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe are connected through the multiplexer switch; the electromagnetic ultrasonic test signal of the test piece is acquired. The pulsed eddy current detection signal is acquired by: disconnecting the electromagnet through the electromagnet excitation module; connecting the pulsed eddy current probe and the signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe through a multiplexer; and acquiring the pulsed eddy current detection signal of the test piece.

9. The method for acquiring damage detection signals in metal pipes based on a composite probe according to claim 8, characterized in that, Also includes: The detection and acquisition of magnetic saturation pulsed eddy current detection signals are performed as follows: the electromagnet is activated through the electromagnet excitation module; the pulsed eddy current probe and the signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe are connected through the multiplexer switch; and the magnetic saturation pulsed eddy current detection signals of the test piece are detected and acquired.

10. The method for acquiring damage detection signals in metal pipes based on a composite probe according to claim 9, characterized in that, In the process of detecting and acquiring the magnetic saturated pulsed eddy current detection signal, before connecting the pulsed eddy current probe and the signal generator in the electromagnetic ultrasound-pulsed eddy current composite probe through a multiplexer switch, the following steps are also included: Based on the designed wall thickness of the test piece, the excitation parameters of the electromagnet are set through the electromagnet excitation module; Set the excitation parameters of the magnetic saturation pulse eddy current signal according to the final test wall thickness of the test piece; Set the parameters of the filter amplifier; Configure the parameters of the signal acquisition card.

11. The method for acquiring damage detection signals in metal pipes based on a composite probe according to claim 8, characterized in that, In the process of detecting and acquiring electromagnetic ultrasonic detection signals, before connecting the electromagnetic ultrasonic probe and the signal generator in the electromagnetic ultrasonic-pulse eddy current composite probe through a multiplexer switch, the following steps are also included: Based on the designed wall thickness of the test piece, the excitation parameters of the electromagnet are set through the electromagnet excitation module; The excitation parameters of the electromagnetic ultrasonic pulse signal are set according to the design wall thickness of the test piece; Set the parameters of the filter amplifier; Configure the parameters of the signal acquisition card.

12. The method for acquiring signals for metal pipe damage detection based on a composite probe according to any one of claims 8-11, characterized in that, The detection and acquisition of pulsed eddy current detection signals, before connecting the pulsed eddy current probe and the signal generator in the electromagnetic ultrasound-pulsed eddy current composite probe via a multiplexer switch, also includes: Set the excitation parameters of the pulsed eddy current signal according to the design wall thickness of the test piece; Set the parameters of the filter amplifier; Configure the parameters of the signal acquisition card.

13. A method for analyzing damage to metal pipes, characterized in that, Based on the detection and acquisition device according to any one of claims 3-7, it includes: Electromagnetic ultrasonic pulse signals and pulsed eddy current signals were collected from calibration specimens with different wall thicknesses; Collect electromagnetic ultrasonic test signals and pulsed eddy current test signals of the specimen to be analyzed; The electromagnetic ultrasonic calibration curve for different wall thicknesses is determined based on the electromagnetic ultrasonic pulse signals of the calibration specimens. Based on the pulsed eddy current signals of calibration specimens with different wall thicknesses, determine the pulsed eddy current calibration curve for each wall thickness. The electromagnetic ultrasonic wall thickness of the specimen to be analyzed is determined based on the electromagnetic ultrasonic calibration curve and electromagnetic ultrasonic detection signal of the wall thickness. Based on the pulsed eddy current calibration curve and pulsed eddy current detection signal of the wall thickness, the pulsed eddy current wall thickness of the specimen to be analyzed is determined.

14. The method for analyzing damage to metal pipes according to claim 13, characterized in that, Also includes: Based on the electromagnetic ultrasonic wall thickness, pulsed eddy current wall thickness, and design wall thickness of the specimen to be analyzed, determine whether the specimen to be analyzed has thinning damage.

15. The method for analyzing damage to metal pipes according to claim 13, characterized in that, Also includes: Collect magnetic saturation pulse eddy current signals of calibration components with different collapse degrees under different wall thicknesses; Collect magnetic saturation pulsed eddy current signals of the specimen to be analyzed; Based on the magnetic saturation pulse eddy current signals of calibration components with different degrees of collapse under different wall thicknesses, the calibration curves for different degrees of collapse under different wall thicknesses are determined. Based on the magnetic saturation pulsed eddy current signal of the specimen to be analyzed, and the calibration curves of different collapse degrees under different wall thicknesses, it is determined whether the specimen to be analyzed has collapse damage and the degree of collapse.

16. The method for analyzing damage to metal pipes according to claim 15, characterized in that, The determination of whether the specimen under analysis exhibits collapse damage and the degree of collapse, based on the magnetic saturation pulsed eddy current signal of the specimen under analysis and calibration curves for different collapse degrees at different wall thicknesses, includes: The magnetic saturation pulse eddy current signal of the test piece was processed sequentially using low-pass filtering, independent component analysis, and Gaussian filtering. Adaptive feature extraction is performed on the processed magnetically saturated pulsed eddy current signal; Based on the result that the late correlation coefficient obtained by adaptive extraction is a predetermined value, it is determined that the test specimen does not have collapse damage; Based on the result that the late correlation coefficient obtained by adaptive extraction is less than the predetermined value, the late correlation coefficient obtained by adaptive extraction is substituted into the calibration curves of different collapse degrees under different wall thicknesses to obtain the collapse degree of the test specimen.

17. A system for analyzing damage to metal pipes, characterized in that, Based on the detection and acquisition device according to any one of claims 3-7, it includes: Collection module: used to collect electromagnetic ultrasonic pulse signals and pulsed eddy current signals of calibration specimens with different wall thicknesses, as well as electromagnetic ultrasonic detection signals and pulsed eddy current detection signals of the test specimens; Calibration module: used to determine the electromagnetic ultrasonic calibration curve of the wall thickness based on the electromagnetic ultrasonic pulse signal of the calibration specimen with different wall thickness, and to determine the pulse eddy current calibration curve of the wall thickness based on the pulse eddy current signal of the calibration specimen with different wall thickness. Analysis module: used to determine the electromagnetic ultrasonic wall thickness of the specimen to be analyzed based on the electromagnetic ultrasonic calibration curve and electromagnetic ultrasonic detection signal based on the wall thickness; and to determine the pulsed eddy current wall thickness of the specimen to be analyzed based on the pulsed eddy current calibration curve and pulsed eddy current detection signal based on the wall thickness.

18. The analysis system for metal pipe damage according to claim 17, characterized in that, The collection module is also used to collect magnetic saturation pulse eddy current signals of calibration parts with different degrees of collapse under different wall thicknesses and magnetic saturation pulse eddy current signals of the test piece. The calibration module is also used to determine calibration curves for different degrees of collapse under different wall thicknesses based on the magnetic saturation pulse eddy current signals of calibration components with different degrees of collapse under different wall thicknesses. The analysis module is also used to determine whether the specimen under analysis has thinning damage based on the electromagnetic ultrasonic wall thickness, pulsed eddy current wall thickness and design wall thickness; it is also used to determine whether the specimen under analysis has collapse damage and the degree of collapse based on the magnetic saturation pulsed eddy current signal of the specimen under analysis and the calibration curves of different collapse degrees under different wall thicknesses.

19. An electronic device, characterized in that, include: Processor, the processor being coupled to memory; The memory is used to store computer programs; The processor is configured to execute the computer program stored in the memory to cause the electronic device to perform the method as described in any one of claims 13 to 16.

20. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program or instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 13 to 16.

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