Ultrasonic- eddy current composite nondestructive testing method and device

Abstract

The application relates to the technical field of nondestructive testing, and discloses an ultrasonic-eddy current composite nondestructive testing method and device. The method uses an integrated composite probe integrating an ultrasonic probe and an eddy current probe in a shell to synchronously or based on a unified time base collect ultrasonic echo signals, eddy current detection signals, probe position signals and coupling state signals of a workpiece to be detected; ultrasonic, eddy current and double-gate detection parameters are configured based on workpiece information and probe calibration information, near-surface and deep defects are respectively identified; position registration, coupling compensation, depth mapping and fusion determination are performed on the two types of signals, and a composite defect result is output. Detection parameters are adjusted based on a detection quality evaluation result feedback, and re-inspection is performed on a low confidence area, so that a closed-loop detection process of parameter configuration, signal collection, defect identification, quality evaluation and feedback re-inspection is formed. The application realizes cooperative detection of near-surface and deep defects, and improves detection coverage, defect positioning accuracy and detection reliability.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and in particular to an ultrasonic-eddy current composite nondestructive testing method and apparatus. Background Technology

[0002] Ultrasonic testing and eddy current testing are both commonly used non-destructive testing methods in industrial manufacturing, equipment maintenance, and quality inspection. Ultrasonic testing, by emitting ultrasonic waves into the workpiece and receiving the reflected echoes from defects, can locate and quantitatively analyze defects such as inclusions, delamination, incomplete penetration, and cracks within the workpiece, and features a large detection depth and strong penetration capability. However, the sensitivity of ultrasonic testing for detecting near-surface micro-cracks, surface opening defects, and shallow corrosion defects is limited by factors such as the probe's initial wave, acoustic coupling state, near-surface blind zone, and workpiece surface morphology.

[0003] Eddy current testing induces eddy currents in conductive workpieces using an alternating magnetic field. Defects are identified based on changes in coil impedance, amplitude, and phase. It exhibits high sensitivity to surface and near-surface cracks, corrosion, and changes in material microstructure, and typically requires no coupling agent. However, the eddy current signal attenuates with increasing detection depth and is significantly affected by the skin effect, lift-off changes, and variations in material conductivity and permeability, making it difficult to reliably detect and accurately quantify the depth of defects in deeper areas.

[0004] Current detection methods typically employ ultrasonic and eddy current testing equipment separately, with inspectors then comparing the results based on the testing location, time, or experience. This approach suffers from issues such as inconsistent probe positions, inconsistencies in scanning trajectories, lack of standardized data time bases, and difficulty in correlating results. Furthermore, changes in workpiece surface condition, coupling state, and probe contact can lead to false alarms or missed detections. Especially for workpieces with both near-surface and deep internal defects, existing single-detection technologies or offline combined detection methods struggle to generate consistent results covering different depth ranges, leaving room for improvement in detection efficiency, defect location accuracy, and reliability. Summary of the Invention

[0005] To address the technical problem that existing ultrasonic and eddy current testing methods struggle to perform gated correlation detection, fusion judgment, and unified display of near-surface and deep defects at the same scanning location, this invention provides an ultrasonic-eddy current composite nondestructive testing method and apparatus.

[0006] In a first aspect, the present invention provides an ultrasonic-eddy current composite nondestructive testing method, comprising the following steps: An integrated ultrasonic-eddy current composite probe with a housing is attached to the surface of the workpiece to be inspected. The housing integrates an ultrasonic probe and an eddy current probe. An ultrasonic excitation signal is applied to the ultrasonic probe through the ultrasonic testing channel, and the ultrasonic echo signal returned by the workpiece under inspection is collected. An alternating electromagnetic excitation signal is applied to the eddy current probe through the eddy current detection channel, and the corresponding eddy current detection signal is acquired. The ultrasonic echo signal and the eddy current detection signal are correlated based on a unified time reference, a probe scanning position reference, or a unified time reference and a probe scanning position reference. A first detection gate and a second detection gate are set up, wherein the first detection gate is a signal acquisition and defect judgment window for the near-surface detection area corresponding to the eddy current detection channel, and the second detection gate is an ultrasonic echo acquisition and defect judgment window for the deep detection area corresponding to the ultrasonic detection channel. The eddy current detection signal corresponding to the near-surface detection area is obtained through the first detection gate, and the near-surface defect detection result is obtained by using the eddy current defect identification algorithm. The ultrasonic echo signal corresponding to the deep detection area is obtained through the second detection gate, and the deep defect detection result is obtained by using the ultrasonic defect recognition algorithm. The near-surface defect detection results and the deep defect detection results are correlated by location, depth, or time to obtain a composite detection result. The composite detection results are displayed on the same display interface as radio frequency waveforms containing eddy current detection signals and ultrasonic echo signals.

[0007] Furthermore, based on the conductivity, permeability, surface condition, and target detection depth of the workpiece being inspected, the eddy current excitation frequency, eddy current excitation amplitude, eddy current gain, and eddy current phase angle are determined. Based on the thickness of the workpiece being inspected, the ultrasonic propagation speed, the depth to be inspected, and the type of ultrasonic probe, determine the ultrasonic excitation voltage, ultrasonic gain, ultrasonic emission repetition frequency, and ultrasonic sampling time. Based on the effective detection depth of the eddy current probe and the near-surface blind zone of the ultrasonic probe, the first detection gate parameters and the second detection gate parameters are determined so that the near-surface detection area and the deep detection area are connected or form an overlapping detection area.

[0008] Furthermore, the first detection gate corresponds to the near-surface detection area of ​​0 mm to 3 mm below the surface of the workpiece being inspected, and the second detection gate corresponds to the deep detection area of ​​more than 3 mm below the surface of the workpiece being inspected. An overlapping detection area is provided between the first detection gate and the second detection gate. The range of the overlapping detection area is dynamically determined based on the effective detection depth of the eddy current detection signal, the near-surface blind zone of the ultrasonic probe, and the detection signal-to-noise ratio.

[0009] Furthermore, including: Based on the relative position parameters between the ultrasonic probe and the eddy current probe, position offset compensation is performed on the detection position corresponding to the ultrasonic echo signal and the detection position corresponding to the eddy current detection signal. The ultrasonic echo signal is coupled and compensated based on the coupling state signal, and the surface echo characteristics or interface echo characteristics in the coupled and compensated ultrasonic echo signal are used to lift and compensate the eddy current detection signal. The compensated ultrasonic echo signal and eddy current detection signal are clock-synchronized to ensure that the effective ultrasonic signal and the effective eddy current signal correspond to the same detection position on the workpiece being inspected.

[0010] Furthermore, the effective eddy current signal is input into the near-surface defect identification model, and the output near-surface defect feature data includes: Extract at least one of the impedance change characteristics, amplitude characteristics, phase characteristics, frequency response characteristics, and time-frequency characteristics of the effective eddy current signal; The extracted features are compared with the eddy current reference features of the defect-free region to obtain near-surface anomaly features; Based on the near-surface anomaly features, output near-surface defect feature data including at least the near-surface anomaly location, equivalent detection depth range, defect response amplitude, defect category, and first confidence level; The defect category includes at least one of the following: surface cracks, near-surface cracks, corrosion defects, inclusion defects, and surface opening defects.

[0011] Furthermore, the effective ultrasonic signal is input into the deep defect identification model, and the deep defect feature data is output, including: The zero point of the ultrasonic echo signal is determined based on surface echo, interface echo, or bottom surface echo. The ultrasonic echo signal corresponding to the deep detection area is intercepted using the second detection gate, and at least one of the echo arrival time, echo amplitude, echo envelope, echo morphology and spectral characteristics is extracted from the intercepted ultrasonic echo signal. The depth information of the deep defect is calculated based on the echo arrival time, time zero point, and ultrasonic propagation speed. Based on the depth information and the extracted ultrasonic echo features, the output includes deep defect feature data that includes at least the location of the deep anomaly, the defect depth, the defect equivalent, the defect category, and the second confidence level.

[0012] Furthermore, the near-surface defect feature data and the deep defect feature data are subjected to position consistency judgment, depth continuity judgment, and feature correlation judgment. When near-surface defect feature data and deep defect feature data are located at the same detection position or within the preset position tolerance range, and are located in the overlapping detection area or meet the preset depth continuity condition, the near-surface defect feature data and deep defect feature data are fused into the same composite defect result. The defect confidence level of the composite defect result is calculated based on the first confidence level, the second confidence level, the signal amplitude, the signal-to-noise ratio, the coupling state, and the positional consistency judgment results. When defect feature data is output only by the ultrasonic testing channel or the eddy current testing channel, or when the confidence level of the defect is lower than the preset confidence level threshold, a defect result to be re-inspected is generated.

[0013] Furthermore, the detection quality evaluation results are generated based on the coupling state signal, ultrasonic echo signal-to-noise ratio, eddy current detection signal-to-noise ratio, position registration error, and defect confidence. When the coupling state signal is lower than a preset coupling threshold, parameter adjustment commands are generated to adjust the probe fit state, coupling agent supply, or ultrasonic gain. When the signal-to-noise ratio of the eddy current detection signal is lower than the preset eddy current signal-to-noise ratio threshold, a parameter adjustment command is generated to adjust the eddy current excitation frequency, eddy current gain, phase angle, or scanning speed. When the ultrasonic echo signal-to-noise ratio is lower than a preset ultrasonic signal-to-noise ratio threshold, a parameter adjustment command is generated to adjust the ultrasonic gain, ultrasonic excitation voltage, the starting position of the second detection gate, or the width of the second detection gate. When the confidence level of the defect is lower than the preset confidence threshold, a parameter adjustment instruction is generated for repeating or encrypting the scan at the corresponding position of the defect result to be re-inspected; The adjusted detection parameters and re-inspection results are re-input into the near-surface defect identification model and the deep defect identification model to update the composite defect results.

[0014] Secondly, the present invention also provides an ultrasonic-eddy current composite nondestructive testing device, including an integrated composite probe, a dual-channel excitation and acquisition module, a parameter configuration module, a signal preprocessing module, a dual-gate control module, a defect identification and fusion module, a quality evaluation and feedback module, a display module, and a storage module; The integrated composite probe includes a housing, an ultrasonic probe, and an eddy current probe. The housing has an ultrasonic probe mounting cavity and an eddy current probe mounting cavity. The ultrasonic probe is disposed in the ultrasonic probe mounting cavity, and the eddy current probe is disposed in the eddy current probe mounting cavity. The dual-channel excitation and acquisition module includes an ultrasonic detection channel and an eddy current detection channel. The ultrasonic detection channel is used to excite the ultrasonic probe based on ultrasonic detection parameters and acquire ultrasonic echo signals. The eddy current detection channel is used to excite the eddy current probe based on eddy current detection parameters and acquire eddy current detection signals. The parameter configuration module is used to receive workpiece information, detection task information and probe calibration information, and generate ultrasonic detection parameters, eddy current detection parameters, scanning parameters, first detection gate parameters and second detection gate parameters; The signal preprocessing module is used to receive the ultrasonic echo signal, eddy current detection signal, probe position signal and coupling status signal, and output the effective ultrasonic signal and effective eddy current signal after position registration and compensation processing; The dual-gate control module includes a first detection gate and a second detection gate. The first detection gate is used to input the effective eddy current signal into the defect identification process corresponding to the near-surface detection area, and the second detection gate is used to input the effective ultrasonic signal into the defect identification process corresponding to the deep detection area. The defect identification and fusion module is used to output near-surface defect feature data, deep defect feature data, and composite defect results obtained by fusing the two. The quality evaluation and feedback module is used to output the detection quality evaluation result and parameter adjustment instruction based on the composite defect result, coupling state signal and signal-to-noise ratio information, and to feed the parameter adjustment instruction back to the parameter configuration module. The display module is used to output composite display data, and the storage module is used to store workpiece information, detection parameters, original detection signals, composite defect results, detection quality evaluation results, and detection report data.

[0015] Furthermore, the ultrasonic probe and the eddy current probe are arranged in at least one of the following ways: coaxial nesting, side-by-side arrangement, front-to-back arrangement along the scanning direction, or array arrangement. The outer shell is made of insulating and wear-resistant material, and the side of the outer shell facing the workpiece being inspected is provided with a planar contact part, an arc-shaped contact part, a V-shaped contact part, a contoured contact part, or a flexible contact part; An electromagnetic shielding isolation layer is provided inside the outer shell, and the electromagnetic shielding isolation layer is located between the ultrasonic probe and the eddy current probe. The outer casing is also provided with at least one of the following: a coupling agent channel, a liquid storage tank, a liquid supply hole, or a coupling pad layer; It also includes at least one of a position encoder, a displacement sensor, a rotary encoder, a scanning mechanism, or a robot motion control mechanism, for inputting probe position signals to the signal preprocessing module; The dual-channel excitation and acquisition module includes a unified clock unit, which is used to control the synchronous excitation and synchronous acquisition of the ultrasonic detection channel and the eddy current detection channel, or to control the time-division excitation and time-division acquisition of the ultrasonic detection channel and the eddy current detection channel. The quality evaluation and feedback module includes a re-inspection control unit. When the composite defect result is a defect result to be re-inspected, the re-inspection control unit outputs a repeat scanning command or an encrypted scanning command to the scanning mechanism or the robot motion control mechanism, and re-inputs the detection signal obtained from the repeat scanning or encrypted scanning into the signal preprocessing module.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Compared with the existing method of performing ultrasonic testing and eddy current testing separately and comparing the test results offline, the present invention adopts an integrated composite probe that integrates ultrasonic probe and eddy current probe in the same housing. It can acquire ultrasonic echo signal and eddy current detection signal corresponding to the same surface to be tested in a single bonding and scanning process, reducing positional deviations caused by changing probes, repeated scanning or inconsistent scanning trajectories, and improving detection efficiency and consistency of test results.

[0017] This invention correlates ultrasonic echo signals and eddy current detection signals by unifying the time reference, probe scanning position reference, or a combination of both. This allows signals generated by different detection mechanisms to be mapped to the same detection location, providing a foundation for subsequent comparison, fusion, and traceability of defect results. By setting a first detection gate corresponding to the near-surface detection area and a second detection gate corresponding to the deep detection area, signals within the effective detection area can be extracted and defects determined based on the high near-surface sensitivity of eddy current detection and the deep penetration characteristics of ultrasonic detection, thereby reducing the influence of irrelevant signals, initial waves, bottom waves, or environmental interference on the detection results.

[0018] Furthermore, by setting up overlapping or intersecting detection areas based on the effective detection depth of the eddy current probe and the near-surface blind zone of the ultrasonic probe, it is beneficial to compensate for the insufficient depth coverage of a single detection method, achieving continuous or cross-coverage detection of the workpiece surface, near-surface, and deep regions. By correlating the two types of detection results by location, depth, or time, near-surface anomalies and deep anomalies at the same location can be identified, forming composite detection results and improving the comprehensive judgment capability of complex defects or cross-depth defects.

[0019] In addition, the radio frequency waveforms containing eddy current detection signals and ultrasonic echo signals are displayed on the same display interface, which makes it easy for inspectors to observe the response characteristics, detection location and defect judgment results of the two types of signals at the same time. This reduces the need for manual switching of equipment and comparison of different data interfaces, and improves the visualization of test results, ease of interpretation and efficiency of on-site testing. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] 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, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0022] Figure 1 A flowchart illustrating the steps of an ultrasonic-eddy current composite nondestructive testing method provided in this application embodiment; Figure 2 A flowchart illustrating a method for configuring detection parameters and determining a dual-detection gate, as provided in an embodiment of this application; Figure 3 A flowchart illustrating a defect identification, fusion, and quality feedback method provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an ultrasonic-eddy current composite nondestructive testing device provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Unless otherwise specified, the various embodiments and technical features described herein can be combined with each other.

[0024] It should be noted that the terms "first," "second," etc., are used to distinguish similar objects and are not used to describe a specific order or sequence. The term "comprising" and its variations indicate an open-ended inclusion relationship, meaning that in addition to the listed technical features, other technical features may also be included.

[0025] In existing nondestructive testing (NDT) methods, eddy current testing has high sensitivity for surface and near-surface defects such as cracks and corrosion, but its ability to detect deep defects is limited due to the skin effect. Ultrasonic testing can detect defects located deep within workpieces and determine their depth, but it is susceptible to near-surface blind zones, coupling conditions, and initial wave interference. Currently, ultrasonic testing and eddy current testing are typically performed using different probes or equipment. Inconsistencies in scanning trajectories, testing times, and probe positions can lead to inaccurate correlation between the two types of test results, making it difficult to uniformly determine near-surface and deep defects.

[0026] Based on this, this application provides an ultrasonic-eddy current composite nondestructive testing method and apparatus. The method integrates an ultrasonic probe and an eddy current probe within the same housing, acquiring ultrasonic echo signals and eddy current detection signals during the same scanning process. It correlates the two types of detection signals using a unified time reference, a probe scanning position reference, or a combination of both. Furthermore, it performs signal acquisition, defect identification, and result fusion through a first detection gate and a second detection gate, respectively corresponding to the near-surface detection area and the deep detection area, thereby achieving composite nondestructive testing of the surface, near-surface, and deep areas of the inspected workpiece.

[0027] See Figure 1 The ultrasonic-eddy current composite nondestructive testing method provided in this application embodiment may include the following steps.

[0028] S110. The ultrasonic-eddy current integrated composite probe with a shell is attached to the surface to be inspected of the workpiece.

[0029] The integrated composite probe includes a housing, an ultrasonic probe, and an eddy current probe. The housing contains an ultrasonic probe mounting cavity and an eddy current probe mounting cavity. The ultrasonic probe is housed within the ultrasonic probe mounting cavity, and the eddy current probe is housed within the eddy current probe mounting cavity.

[0030] In some embodiments, the ultrasonic probe and the eddy current probe can be arranged in at least one of the following ways: coaxial nesting, side-by-side arrangement, front-to-back arrangement along the scanning direction, or array arrangement. When arranged in a coaxial nesting configuration, the consistency between the ultrasonic detection position and the eddy current detection position can be improved; when arranged front-to-back along the scanning direction, position compensation can be performed based on the distance between the two probes and the scanning speed; when arranged in an array, the detection coverage area of ​​a single scan can be expanded.

[0031] The outer shell can be made of insulating and wear-resistant materials, such as polyetheretherketone, polytetrafluoroethylene, engineering plastics, or ceramic materials, to reduce the influence of the outer shell on the eddy current detection signal and improve the wear resistance of the probe when scanning the workpiece surface. The side of the outer shell facing the workpiece can be provided with a planar contact portion, an arc-shaped contact portion, a V-shaped contact portion, a contoured contact portion, or a flexible contact portion. For flat workpieces, a planar contact portion can be used; for tubular workpieces, an arc-shaped contact portion can be used; for weld seams or edge areas, a V-shaped contact portion or a contoured contact portion can be used.

[0032] In one embodiment, an electromagnetic shielding layer is provided within the housing, located between the ultrasonic probe and the eddy current probe, to reduce electromagnetic interference from the eddy current excitation signal to the ultrasonic testing channel. The housing may also include at least one of a coupling agent channel, a reservoir, a supply hole, or a coupling pad layer to provide coupling agent between the ultrasonic probe and the workpiece under test. The coupling agent may be water, coupling gel, grease, or other coupling media suitable for ultrasonic testing.

[0033] S120, Configure ultrasonic testing parameters, eddy current testing parameters, scanning parameters, first detection gate parameters, and second detection gate parameters.

[0034] Optionally, Figure 2 This is a flowchart illustrating a method for configuring detection parameters and determining dual detection gates, as provided in an embodiment of this application.

[0035] S121. Obtain the electrical conductivity, magnetic permeability, surface condition, thickness, ultrasonic propagation speed, target detection depth, probe type, and probe calibration information of the workpiece under inspection. S122. Based on the conductivity, permeability, surface condition, and target detection depth, determine the eddy current excitation frequency, eddy current excitation amplitude, eddy current gain, and eddy current phase angle; based on the thickness, ultrasonic wave propagation speed, detection depth, and ultrasonic probe type, determine the ultrasonic excitation voltage, ultrasonic gain, ultrasonic emission repetition frequency, and ultrasonic sampling time. S123. Based on the effective detection depth of the eddy current probe and the near-surface blind zone of the ultrasonic probe, determine the first detection gate parameters and the second detection gate parameters so that the near-surface detection area and the deep detection area are connected or form an overlapping detection area.

[0036] Before conducting the inspection, the workpiece information, inspection task information, and probe calibration information can be obtained. The workpiece information may include the material type, conductivity, magnetic permeability, thickness, surface condition, curvature, and target inspection depth of the workpiece. The inspection task information may include the area to be inspected, scanning direction, scanning speed, scanning step distance, and defect detection requirements. The probe calibration information may include the center frequency of the ultrasonic probe, ultrasonic propagation speed, eddy current probe coil parameters, relative position parameters between the ultrasonic probe and the eddy current probe, and probe reference response data.

[0037] Based on the electrical conductivity, magnetic permeability, surface condition, and target detection depth of the workpiece being inspected, the eddy current excitation frequency, eddy current excitation amplitude, eddy current gain, and eddy current phase angle are determined. The effective detection depth of eddy current testing can be determined based on the material's electromagnetic properties and the alternating electromagnetic excitation frequency. For scenarios requiring the detection of shallow surface cracks, a higher eddy current excitation frequency can be selected; for scenarios requiring increased near-surface detection depth, a lower eddy current excitation frequency can be selected.

[0038] In one embodiment, the eddy current skin depth can be estimated using the following formula: δ = √[2 / (ωμσ)] Where δ is the skin depth, ω is the angular frequency of the alternating electromagnetic excitation signal, μ is the permeability of the workpiece under inspection, and σ is the conductivity of the workpiece under inspection. The effective detection depth range of eddy current detection can be determined based on the skin depth, the detection signal-to-noise ratio, and the target detection depth.

[0039] Based on the thickness of the workpiece being inspected, the ultrasonic wave propagation speed, the depth to be inspected, and the type of ultrasonic probe, determine the ultrasonic excitation voltage, ultrasonic gain, ultrasonic emission repetition frequency, and ultrasonic sampling time. The ultrasonic sampling time should at least cover the ultrasonic echo time corresponding to the target depth range.

[0040] In one embodiment, a first detection gate parameter and a second detection gate parameter are determined based on the effective detection depth of the eddy current probe and the near-surface blind zone of the ultrasonic probe, such that the near-surface detection area and the deep detection area are connected or form an overlapping detection area. The first detection gate corresponds to the near-surface detection area of ​​the eddy current detection channel; the second detection gate corresponds to the deep detection area of ​​the ultrasonic detection channel.

[0041] For example, the first detection gate can correspond to a near-surface detection area of ​​0 mm to 3 mm below the surface of the workpiece, and the second detection gate can correspond to a deep detection area greater than 3 mm below the surface of the workpiece. An overlapping detection area can be provided between the first and second detection gates. The range of the overlapping detection area can be dynamically determined based on the effective detection depth of the eddy current detection signal, the near-surface blind zone of the ultrasonic probe, and the detection signal-to-noise ratio.

[0042] It should be noted that the above detection depth range of 0 mm to 3 mm is only an example. In actual implementation, the detection areas corresponding to the first and second detection gates can be adjusted according to the workpiece material, workpiece thickness, probe frequency, eddy current excitation frequency, ultrasonic near-surface blind zone, and detection signal-to-noise ratio.

[0043] S130. Apply an ultrasonic excitation signal to the ultrasonic probe through the ultrasonic testing channel and collect the ultrasonic echo signal returned by the workpiece under inspection; apply an alternating electromagnetic excitation signal to the eddy current probe through the eddy current testing channel and collect the corresponding eddy current testing signal.

[0044] The ultrasonic testing channel can apply an ultrasonic excitation signal to the ultrasonic probe according to preset ultrasonic testing parameters, causing the ultrasonic probe to emit ultrasonic waves toward the workpiece under inspection and receive ultrasonic echo signals formed by reflections from the surface, internal defects, interfaces, or bottom surface of the workpiece. The ultrasonic echo signal can be a radio frequency signal or a digital signal obtained after amplification, filtering, detection, and analog-to-digital conversion.

[0045] The eddy current detection channel can apply an alternating electromagnetic excitation signal to the eddy current probe according to preset eddy current detection parameters, and collect the coil impedance change signal caused by the eddy current response in the inspected workpiece. The eddy current detection signal may include at least one of impedance signal, amplitude signal, phase signal, in-phase signal, and quadrature signal.

[0046] In one embodiment, the ultrasonic detection channel and the eddy current detection channel can be excited and acquired synchronously. In this case, the two types of detection signals can be correlated based on timestamps generated by a unified clock unit. In another embodiment, the ultrasonic detection channel and the eddy current detection channel can be excited and acquired in a time-division manner. For example, after the ultrasonic probe emits an ultrasonic pulse and completes echo acquisition, an alternating electromagnetic excitation signal is applied through the eddy current probe to reduce the interference of the ultrasonic high-voltage excitation pulse on the eddy current detection channel.

[0047] S140. Correlate the ultrasonic echo signal and the eddy current detection signal based on a unified time reference, a probe scanning position reference, or a unified time reference and a probe scanning position reference.

[0048] During the detection process, probe position signals can be acquired through a position encoder, displacement sensor, rotary encoder, scanning mechanism, or robot motion control mechanism. The probe position signals may include at least one of the following: linear position coordinates, two-dimensional position coordinates, rotation angle, scanning direction, scanning speed, or curved surface path coordinates.

[0049] Since there may be relative positional deviations between the ultrasonic probe and the eddy current probe within the housing, positional offset compensation can be performed on the detection positions corresponding to the ultrasonic echo signal and the eddy current detection signal based on their relative position parameters. For example, if the interval between the ultrasonic probe and the eddy current probe along the scanning direction is L, and the scanning speed is v, time compensation can be performed on the corresponding detection signals based on L / v; alternatively, positional compensation can be performed directly based on the spatial position coordinates acquired by the position encoder.

[0050] In one embodiment, a coupling state signal can also be acquired. This coupling state signal can be obtained from a pressure sensor, a coupling agent supply sensor, ultrasonic surface echo amplitude, ultrasonic interface echo characteristics, or other coupling state detection units. Based on the coupling state signal, coupling compensation can be performed on the ultrasonic echo signal, such as gain compensation, amplitude normalization, time delay correction, or abnormal signal removal.

[0051] Furthermore, the surface echo or interface echo characteristics in the coupled and compensated ultrasonic echo signal can be used to perform lift-off compensation on the eddy current detection signal. Specifically, when the surface echo amplitude, interface echo amplitude, or echo arrival time changes, it can be determined that the contact state or lift-off distance between the probe and the workpiece under inspection has changed. Based on this change, a preset lift-off compensation model can be invoked to correct the amplitude drift and phase drift of the eddy current detection signal.

[0052] After position offset compensation, coupling compensation, lift-off compensation and clock synchronization processing, the effective ultrasonic signal and eddy current signal corresponding to the same detection position of the inspected workpiece are obtained.

[0053] S150. Obtain the eddy current detection signal corresponding to the near-surface detection area through the first detection gate, and use the eddy current defect identification algorithm to obtain the near-surface defect detection result.

[0054] The first detection gate is a signal acquisition and defect judgment window for the near-surface detection area corresponding to the eddy current detection channel. The first detection gate can be set based on the eddy current excitation frequency, effective detection depth, scanning position, and signal stability. It is used to filter the effective eddy current signals corresponding to the near-surface detection area and exclude invalid signals corresponding to the probe's unstable initial region, workpiece edge region, lift-off abrupt region, or abnormal noise region.

[0055] In one embodiment, the effective eddy current signal is input into a near-surface defect identification model to extract at least one of impedance change features, amplitude features, phase features, frequency response features, and time-frequency features. The near-surface defect identification model can be implemented using a threshold judgment model, a rule judgment model, a statistical classification model, a support vector machine model, a neural network model, or other machine learning models.

[0056] The extracted features are compared with the eddy current reference features corresponding to the defect-free area to obtain near-surface anomaly features. These eddy current reference features can be obtained through calibration using standard test blocks, or they can be derived from the defect-free area of ​​the same inspected workpiece or from a historical inspection database.

[0057] Based on the near-surface anomaly characteristics, near-surface defect feature data is output. The near-surface defect feature data may include at least the near-surface anomaly location, equivalent detection depth range, defect response amplitude, defect category, and first confidence level. The defect category may include at least one of surface cracks, near-surface cracks, corrosion defects, inclusion defects, and surface opening defects.

[0058] S160. Obtain the ultrasonic echo signal corresponding to the deep detection area through the second detection gate, and use the ultrasonic defect recognition algorithm to obtain the deep defect detection result.

[0059] The second detection gate is the ultrasonic echo acquisition and defect judgment window corresponding to the deep detection area of ​​the ultrasonic detection channel. The second detection gate may include a start time, an end time, a gate width, a gate threshold, and alarm rules. The starting position of the second detection gate can be set after the ultrasonic initial wave and the near-surface blind zone, and its ending position can be determined according to the thickness of the inspected workpiece, the target detection depth, or the bottom surface echo position.

[0060] In one embodiment, the zero point of the ultrasonic echo signal is determined based on surface echo, interface echo, or bottom surface echo. The ultrasonic echo signal corresponding to the deep detection region is intercepted using a second detection gate, and at least one of the following is extracted from the intercepted ultrasonic echo signal: echo arrival time, echo amplitude, echo envelope, echo morphology, and spectral characteristics.

[0061] The depth information of deep defects is calculated based on the echo arrival time, zero-time point, and the propagation speed of the ultrasonic wave within the inspected workpiece. For example, the depth of a deep defect can be calculated as follows: d = c(t1 - t0) / 2 Where d is the depth of the deep defect, c is the propagation speed of the ultrasonic wave in the inspected workpiece, t1 is the arrival time of the defect echo, and t0 is the zero point of the ultrasonic echo signal.

[0062] Based on the depth information and ultrasonic echo characteristics, deep defect feature data is output. This deep defect feature data may include at least the location of the deep anomaly, defect depth, defect equivalent, defect category, and a second confidence level. The defect equivalent can be obtained by comparing the defect echo amplitude, echo envelope area, or spectral characteristics with the echo response of a standard reflector.

[0063] S170. Perform positional correlation, depth correlation, or time correlation between the near-surface defect detection results and the deep defect detection results to obtain composite detection results.

[0064] Specifically, positional consistency, depth continuity, and feature correlation are determined for near-surface defect feature data and deep defect feature data.

[0065] The position consistency judgment is used to determine whether near-surface anomalies and deep anomalies are located at the same detection position, or whether they are within a preset position tolerance range. The preset position tolerance can be set based on probe size, scanning step distance, position encoding accuracy, and position offset compensation accuracy.

[0066] The depth continuity determination is used to determine whether the equivalent detection depth range of near-surface defects and the depth of deep defects are located in overlapping detection areas, or whether a preset depth continuity condition is met. The feature correlation determination can be based on information such as defect response amplitude, phase change trend, ultrasonic echo morphology, defect type, and scan trajectory continuity.

[0067] When near-surface defect feature data and deep defect feature data are located at the same detection position or within the preset position tolerance range, and are located in the overlapping detection area or meet the preset depth continuity condition, near-surface defect feature data and deep defect feature data can be fused into the same composite defect result.

[0068] The composite defect results may include defect location, defect depth range, defect category, near-surface detection signal characteristics, deep ultrasonic echo characteristics, defect size information, and overall defect confidence level.

[0069] In one embodiment, the defect confidence of the composite defect result is calculated based on a first confidence level, a second confidence level, ultrasonic echo signal amplitude, eddy current detection signal amplitude, ultrasonic echo signal-to-noise ratio, eddy current detection signal-to-noise ratio, coupling state, and position consistency judgment results. For example, the comprehensive defect confidence level can be calculated using the following weighted method: C = w1C1 + w2C2 + w3SNRu + w4SNRe + w5P Where C is the overall defect confidence level, C1 is the first confidence level, C2 is the second confidence level, SNRu is the ultrasonic echo signal-to-noise ratio, SNRe is the eddy current detection signal-to-noise ratio, P is the position consistency evaluation value, and w1 to w5 are the corresponding weighting coefficients.

[0070] When only the ultrasonic testing channel or eddy current testing channel outputs defect feature data, or when the defect confidence level is lower than a preset confidence threshold, a defect result to be re-inspected is generated. The defect result to be re-inspected may include the location to be re-inspected, the type of abnormal signal, the preliminary defect judgment result, the testing quality information, and recommended re-inspection parameters.

[0071] S180. Generate detection quality evaluation results and parameter adjustment instructions based on coupling state signal, signal-to-noise ratio information, position registration error and defect confidence.

[0072] Optionally, Figure 3 A flowchart illustrating a defect identification, fusion, and quality feedback method provided in an embodiment of this application.

[0073] S181. Based on the first detection gate, the effective eddy current signal is intercepted, and the near-surface defect feature data is output using the near-surface defect identification model. S182, and based on the second detection gate, intercept the effective ultrasonic signal, and use the deep defect identification model to output deep defect feature data; S183. Perform position consistency judgment, depth continuity judgment, and feature correlation judgment on near-surface defect feature data and deep defect feature data to obtain composite defect results and defect confidence. S184. Generate the detection quality evaluation result based on the coupling state signal, ultrasonic echo signal-to-noise ratio, eddy current detection signal-to-noise ratio, position registration error, and defect confidence. S185. When the detection quality does not meet the preset conditions or the defect confidence level is lower than the preset confidence threshold, a parameter adjustment instruction is generated, and a repeat scan or encrypted scan is performed on the corresponding position.

[0074] Specifically, the detection quality evaluation results can be generated based on the coupling state signal, ultrasonic echo signal-to-noise ratio, eddy current detection signal-to-noise ratio, position registration error, and defect confidence level. The detection quality evaluation results may include coupling quality level, ultrasonic signal quality level, eddy current signal quality level, position registration level, defect identification reliability level, and re-inspection identifier.

[0075] When the coupling status signal is lower than a preset coupling threshold, parameter adjustment commands are generated to adjust the probe contact state, the amount of coupling agent supplied, or the ultrasonic gain. For example, the coupling agent supply device can be controlled to increase the amount of coupling agent supplied, the scanning mechanism can be controlled to decrease the scanning speed, or the contact pressure of the probe on the surface of the workpiece being inspected can be increased.

[0076] When the signal-to-noise ratio (SNR) of the eddy current detection signal is lower than the preset eddy current SNR threshold, parameter adjustment commands are generated to adjust the eddy current excitation frequency, eddy current gain, phase angle, or scanning speed. When the ultrasonic echo SNR is lower than the preset ultrasonic SNR threshold, parameter adjustment commands are generated to adjust the ultrasonic gain, ultrasonic excitation voltage, second detection gate start position, or second detection gate width.

[0077] When the defect confidence level is lower than the preset confidence threshold, parameter adjustment instructions are generated for repeating or intensively scanning the corresponding location of the defect to be re-inspected. Repeated scanning can be scanning along the original scanning path again; intensive scanning can be reducing the scanning step size, reducing the scanning speed, changing the scanning direction, or increasing the number of scans.

[0078] The adjusted detection parameters and re-inspection results are re-entered into the near-surface defect identification model and the deep defect identification model to update the composite defect results.

[0079] S190. Display the composite detection results as a radio frequency waveform containing eddy current detection signals and ultrasonic echo signals on the same display interface.

[0080] In one embodiment, the display interface can simultaneously display at least one of the following: eddy current detection signal, ultrasonic radio frequency waveform, ultrasonic A-scan waveform, probe scanning position, first detection gate, second detection gate, near-surface defect mark, deep defect mark, composite defect location, defect category, defect depth, and defect confidence level.

[0081] By displaying eddy current detection signals and ultrasonic echo signals corresponding to the same detection location on the same display interface, inspectors can simultaneously interpret near-surface abnormal responses and deep echo responses, reducing the risk of reduced detection efficiency or misjudgment caused by switching between different devices or display interfaces and manual comparison.

[0082] See Figure 4 This application also provides an ultrasonic-eddy current composite nondestructive testing device, including an integrated composite probe 100, a dual-channel excitation and acquisition module 200, a parameter configuration module 300, a signal preprocessing module 400, a dual-gate control module 500, a defect identification and fusion module 600, a quality evaluation and feedback module 700, a display module 800, and a storage module 900.

[0083] The integrated composite probe 100 includes a housing, an ultrasonic probe, and an eddy current probe. The ultrasonic probe and the eddy current probe are integrated into the same housing and are attached to the surface of the workpiece to be inspected.

[0084] The dual-channel excitation and acquisition module 200 includes an ultrasonic detection channel and an eddy current detection channel. The ultrasonic detection channel is used to excite an ultrasonic probe based on ultrasonic detection parameters and acquire ultrasonic echo signals; the eddy current detection channel is used to excite an eddy current probe based on eddy current detection parameters and acquire eddy current detection signals.

[0085] In one embodiment, the dual-channel excitation and acquisition module 200 includes a unified clock unit. The unified clock unit is used to control the synchronous excitation and acquisition of the ultrasonic detection channel and the eddy current detection channel, or to control the time-division excitation and time-division acquisition of the ultrasonic detection channel and the eddy current detection channel.

[0086] The parameter configuration module 300 is used to receive workpiece information, detection task information and probe calibration information, and generate ultrasonic detection parameters, eddy current detection parameters, scanning parameters, first detection gate parameters and second detection gate parameters.

[0087] The signal preprocessing module 400 is used to receive ultrasonic echo signals, eddy current detection signals, probe position signals, and coupling status signals, and output effective ultrasonic signals and effective eddy current signals after position registration and compensation processing. The compensation processing may include at least one of position offset compensation, coupling compensation, lift-off compensation, amplitude normalization, time delay correction, and clock synchronization.

[0088] The dual-gate control module 500 includes a first detection gate and a second detection gate. The first detection gate is used to input the effective eddy current signal into the defect identification process corresponding to the near-surface detection area; the second detection gate is used to input the effective ultrasonic signal into the defect identification process corresponding to the deep detection area.

[0089] The defect identification and fusion module 600 is used to output near-surface defect feature data based on the effective eddy current signal, output deep defect feature data based on the effective ultrasonic signal, and perform position correlation, depth correlation, or time correlation on the near-surface defect feature data and the deep defect feature data to output composite defect results.

[0090] The quality evaluation and feedback module 700 is used to output the detection quality evaluation result and parameter adjustment command based on the composite defect result, coupling state signal, ultrasonic echo signal-to-noise ratio, eddy current detection signal-to-noise ratio and position registration error, and to feed the parameter adjustment command back to the parameter configuration module 300.

[0091] In one embodiment, the quality evaluation and feedback module 700 includes a re-inspection control unit. When the composite defect result is a defect result to be re-inspected, the re-inspection control unit outputs a repeat scan command or an encrypted scan command to the scanning mechanism or the robot motion control mechanism, and re-inputs the detection signal obtained from the repeat scan or encrypted scan into the signal preprocessing module 400.

[0092] The display module 800 is used to output composite display data, which includes at least one of eddy current detection signal, ultrasonic echo signal, defect location, defect depth, defect category, defect confidence level, and detection quality evaluation result.

[0093] The storage module 900 is used to store workpiece information, detection parameters, original detection signals, probe position signals, coupling status signals, near-surface defect feature data, deep defect feature data, composite defect results, detection quality evaluation results, parameter adjustment records, re-inspection results, and detection report data.

[0094] In this embodiment, each module can be implemented by software, hardware, or a combination of both. For example, the parameter configuration module 300, signal preprocessing module 400, dual-gate control module 500, defect identification and fusion module 600, and quality evaluation and feedback module 700 can be implemented by a processor executing program instructions stored in the memory, or by a digital signal processor, field-programmable gate array, application-specific integrated circuit, or other hardware circuits with data processing capabilities.

[0095] This application achieves simultaneous scanning coverage of ultrasonic and eddy current testing using an integrated composite probe. It establishes the correlation between the two types of detection signals through a unified time reference and / or probe scanning position reference. Effective signal acquisition and defect identification in the near-surface and deep regions are accomplished through a first and a second detection gate, respectively. Furthermore, by employing position offset compensation, coupling compensation, lift-off compensation, defect feature fusion, detection quality evaluation, and low-confidence re-inspection, the continuity of detection coverage from the near-surface to the deep region of the workpiece, the consistency of defect localization, and the overall reliability of detection can be improved.

Claims

1. A method for ultrasonic-eddy current combined nondestructive testing, characterized in that, Includes the following steps: An integrated ultrasonic-eddy current composite probe with a housing is attached to the surface of the workpiece to be inspected. The housing integrates an ultrasonic probe and an eddy current probe. An ultrasonic excitation signal is applied to the ultrasonic probe through the ultrasonic testing channel, and the ultrasonic echo signal returned by the workpiece under inspection is collected. An alternating electromagnetic excitation signal is applied to the eddy current probe through the eddy current detection channel, and the corresponding eddy current detection signal is acquired. The ultrasonic echo signal and the eddy current detection signal are correlated based on a unified time reference, a probe scanning position reference, or a unified time reference and a probe scanning position reference. A first detection gate and a second detection gate are set up, wherein the first detection gate is a signal acquisition and defect judgment window for the near-surface detection area corresponding to the eddy current detection channel, and the second detection gate is an ultrasonic echo acquisition and defect judgment window for the deep detection area corresponding to the ultrasonic detection channel. The eddy current detection signal corresponding to the near-surface detection area is obtained through the first detection gate, and the near-surface defect detection result is obtained by using the eddy current defect identification algorithm. The ultrasonic echo signal corresponding to the deep detection area is obtained through the second detection gate, and the deep defect detection result is obtained by using the ultrasonic defect recognition algorithm. The near-surface defect detection results and the deep defect detection results are correlated by location, depth, or time to obtain a composite detection result. The composite detection results are displayed on the same display interface as radio frequency waveforms containing eddy current detection signals and ultrasonic echo signals.

2. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, Also includes: Based on the conductivity, permeability, surface condition, and target detection depth of the workpiece being inspected, determine the eddy current excitation frequency, eddy current excitation amplitude, eddy current gain, and eddy current phase angle. Based on the thickness of the workpiece being inspected, the ultrasonic propagation speed, the depth to be inspected, and the type of ultrasonic probe, determine the ultrasonic excitation voltage, ultrasonic gain, ultrasonic emission repetition frequency, and ultrasonic sampling time. Based on the effective detection depth of the eddy current probe and the near-surface blind zone of the ultrasonic probe, the first detection gate parameters and the second detection gate parameters are determined so that the near-surface detection area and the deep detection area are connected or form an overlapping detection area.

3. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, The first detection gate corresponds to the near-surface detection area of ​​0 mm to 3 mm below the surface of the workpiece being inspected, and the second detection gate corresponds to the deep detection area of ​​more than 3 mm below the surface of the workpiece being inspected. An overlapping detection area is provided between the first detection gate and the second detection gate. The range of the overlapping detection area is dynamically determined based on the effective detection depth of the eddy current detection signal, the near-surface blind zone of the ultrasonic probe, and the detection signal-to-noise ratio.

4. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, Also includes: Based on the relative position parameters between the ultrasonic probe and the eddy current probe, position offset compensation is performed on the detection position corresponding to the ultrasonic echo signal and the detection position corresponding to the eddy current detection signal. The ultrasonic echo signal is coupled and compensated based on the coupling state signal, and the surface echo characteristics or interface echo characteristics in the coupled and compensated ultrasonic echo signal are used to lift and compensate the eddy current detection signal. The compensated ultrasonic echo signal and eddy current detection signal are clock-synchronized to ensure that the effective ultrasonic signal and the effective eddy current signal correspond to the same detection position on the workpiece being inspected.

5. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, The effective eddy current signal is input into the near-surface defect identification model, and the output near-surface defect feature data includes: Extract at least one of the impedance change characteristics, amplitude characteristics, phase characteristics, frequency response characteristics, and time-frequency characteristics of the effective eddy current signal; The extracted features are compared with the eddy current reference features of the defect-free region to obtain near-surface anomaly features; Based on the near-surface anomaly features, output near-surface defect feature data including at least the near-surface anomaly location, equivalent detection depth range, defect response amplitude, defect category, and first confidence level; The defect category includes at least one of the following: surface cracks, near-surface cracks, corrosion defects, inclusion defects, and surface opening defects.

6. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, The effective ultrasonic signal is input into the deep defect identification model, and the deep defect feature data is output, including: The zero point of the ultrasonic echo signal is determined based on surface echo, interface echo, or bottom surface echo. The ultrasonic echo signal corresponding to the deep detection area is intercepted using the second detection gate, and at least one of the echo arrival time, echo amplitude, echo envelope, echo morphology and spectral characteristics is extracted from the intercepted ultrasonic echo signal. The depth information of the deep defect is calculated based on the echo arrival time, time zero point, and ultrasonic propagation speed. Based on the depth information and the extracted ultrasonic echo features, the output includes deep defect feature data that includes at least the location of the deep anomaly, the defect depth, the defect equivalent, the defect category, and the second confidence level.

7. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, Also includes: The near-surface defect feature data and the deep defect feature data are evaluated for positional consistency, depth continuity, and feature correlation. When near-surface defect feature data and deep defect feature data are located at the same detection position or within the preset position tolerance range, and are located in the overlapping detection area or meet the preset depth continuity condition, the near-surface defect feature data and deep defect feature data are fused into the same composite defect result. The defect confidence level of the composite defect result is calculated based on the first confidence level, the second confidence level, the signal amplitude, the signal-to-noise ratio, the coupling state, and the positional consistency judgment results. When defect feature data is output only by the ultrasonic testing channel or the eddy current testing channel, or when the confidence level of the defect is lower than the preset confidence level threshold, a defect result to be re-inspected is generated.

8. The ultrasonic-eddy current composite nondestructive testing method according to claim 1, characterized in that, Also includes: The detection quality evaluation results are generated based on the coupling state signal, ultrasonic echo signal-to-noise ratio, eddy current detection signal-to-noise ratio, position registration error, and defect confidence. When the coupling state signal is lower than a preset coupling threshold, parameter adjustment commands are generated to adjust the probe fit state, coupling agent supply, or ultrasonic gain. When the signal-to-noise ratio of the eddy current detection signal is lower than the preset eddy current signal-to-noise ratio threshold, a parameter adjustment command is generated to adjust the eddy current excitation frequency, eddy current gain, phase angle, or scanning speed. When the ultrasonic echo signal-to-noise ratio is lower than a preset ultrasonic signal-to-noise ratio threshold, a parameter adjustment command is generated to adjust the ultrasonic gain, ultrasonic excitation voltage, the starting position of the second detection gate, or the width of the second detection gate. When the confidence level of the defect is lower than the preset confidence threshold, a parameter adjustment instruction is generated for repeating or encrypting the scan at the corresponding position of the defect result to be re-inspected; The adjusted detection parameters and re-inspection results are re-input into the near-surface defect identification model and the deep defect identification model to update the composite defect results.

9. An ultrasonic-eddy current composite nondestructive testing device, characterized in that, It includes an integrated composite probe, a dual-channel excitation and acquisition module, a parameter configuration module, a signal preprocessing module, a dual-gate control module, a defect identification and fusion module, a quality evaluation and feedback module, a display module, and a storage module; The integrated composite probe includes a housing, an ultrasonic probe, and an eddy current probe. The housing has an ultrasonic probe mounting cavity and an eddy current probe mounting cavity. The ultrasonic probe is disposed in the ultrasonic probe mounting cavity, and the eddy current probe is disposed in the eddy current probe mounting cavity. The dual-channel excitation and acquisition module includes an ultrasonic detection channel and an eddy current detection channel. The ultrasonic detection channel is used to excite the ultrasonic probe based on ultrasonic detection parameters and acquire ultrasonic echo signals. The eddy current detection channel is used to excite the eddy current probe based on eddy current detection parameters and acquire eddy current detection signals. The parameter configuration module is used to receive workpiece information, detection task information and probe calibration information, and generate ultrasonic detection parameters, eddy current detection parameters, scanning parameters, first detection gate parameters and second detection gate parameters; The signal preprocessing module is used to receive the ultrasonic echo signal, eddy current detection signal, probe position signal and coupling status signal, and output the effective ultrasonic signal and effective eddy current signal after position registration and compensation processing; The dual-gate control module includes a first detection gate and a second detection gate. The first detection gate is used to input the effective eddy current signal into the defect identification process corresponding to the near-surface detection area, and the second detection gate is used to input the effective ultrasonic signal into the defect identification process corresponding to the deep detection area. The defect identification and fusion module is used to output near-surface defect feature data, deep defect feature data, and composite defect results obtained by fusing the two. The quality evaluation and feedback module is used to output the detection quality evaluation result and parameter adjustment instruction based on the composite defect result, coupling state signal and signal-to-noise ratio information, and to feed the parameter adjustment instruction back to the parameter configuration module. The display module is used to output composite display data, and the storage module is used to store workpiece information, detection parameters, original detection signals, composite defect results, detection quality evaluation results, and detection report data.

10. The ultrasonic-eddy current composite nondestructive testing device according to claim 9, characterized in that, The ultrasonic probe and the eddy current probe are arranged in at least one of the following ways: coaxial nesting, side-by-side arrangement, front-to-back arrangement along the scanning direction, or array arrangement. The outer shell is made of insulating and wear-resistant material, and the side of the outer shell facing the workpiece being inspected is provided with a planar contact part, an arc-shaped contact part, a V-shaped contact part, a contoured contact part, or a flexible contact part; An electromagnetic shielding isolation layer is provided inside the outer shell, and the electromagnetic shielding isolation layer is located between the ultrasonic probe and the eddy current probe. The outer casing is also provided with at least one of the following: a coupling agent channel, a liquid storage tank, a liquid supply hole, or a coupling pad layer; It also includes at least one of a position encoder, a displacement sensor, a rotary encoder, a scanning mechanism, or a robot motion control mechanism, for inputting probe position signals to the signal preprocessing module; The dual-channel excitation and acquisition module includes a unified clock unit, which is used to control the synchronous excitation and synchronous acquisition of the ultrasonic detection channel and the eddy current detection channel, or to control the time-division excitation and time-division acquisition of the ultrasonic detection channel and the eddy current detection channel. The quality evaluation and feedback module includes a re-inspection control unit. When the composite defect result is a defect result to be re-inspected, the re-inspection control unit outputs a repeat scan command or an encrypted scan command to the scanning mechanism or the robot motion control mechanism, and re-inputs the detection signal obtained from the repeat scan or encrypted scan into the signal preprocessing module.

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