A pipeline magnetostrictive electromagnetic ultrasonic transducer, detection device and method

Abstract

The present application discloses a pipeline magnetostrictive electromagnetic ultrasonic transducer, a detection device and a method, which relates to the field of electromagnetic ultrasonic nondestructive testing. The electromagnetic ultrasonic transducer includes a magnetostrictive strip arranged on the outer surface of the pipeline to be detected, an eddy current coil and a plurality of excitation coil units; the eddy current coil is wound around the outer surface of the magnetostrictive strip along the circumferential direction; the eddy current coil can be used as an excitation end and a receiving end eddy current coil, an excitation end eddy current coil or a receiving end eddy current coil; each excitation coil unit is distributed on the magnetostrictive strip at intervals; the excitation coil of each excitation coil unit is wound around the wall of the magnetostrictive strip along the axial direction; the excitation coil of the excitation coil unit provides a bias magnetic field for the magnetostrictive strip. The excitation coil is used to replace the permanent magnet, which improves the heat resistance of the electromagnetic ultrasonic transducer; the sparse excitation coil increases the contact area between the magnetostrictive strip and the pipeline to be detected, and improves the energy efficiency of the electromagnetic ultrasonic sensor.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic ultrasonic nondestructive testing, and in particular to a pipeline magnetostrictive electromagnetic ultrasonic transducer, a detection device and a detection method. Background Art

[0002] Industrial metal pipelines that work in high-temperature environments for a long time will inevitably produce defects such as corrosion and cracks, which seriously threaten transportation safety. It is of great significance to carry out online monitoring and positioning of defects in metal pipelines without stopping production or damaging the pipelines. Traditional piezoelectric ultrasonic technology is widely used in the field of guided wave detection, but its dependence on coupling agents makes it difficult to apply to high-temperature environments. Electromagnetic ultrasonic technology does not require coupling agents, and the operation process is safe and convenient, but the permanent magnet in the electromagnetic ultrasonic transducer has the problem of high-temperature demagnetization during high-temperature online detection, resulting in a low signal-to-noise ratio of the detection signal and difficulty in quantitative detection. Summary of the invention

[0003] The purpose of the present application is to provide a pipeline magnetostrictive electromagnetic ultrasonic transducer, a detection device and a method, which can solve the problem of low electromagnetic ultrasonic conversion efficiency caused by high-temperature demagnetization of permanent magnets in existing electromagnetic ultrasonic transducers during high-temperature online detection.

[0004] To achieve the above objectives, this application provides the following solutions.

[0005] In a first aspect, the present application provides a pipeline magnetostrictive electromagnetic ultrasonic transducer, comprising: the pipeline magnetostrictive electromagnetic ultrasonic transducer comprises: a magnetostrictive strip arranged on the outer surface of a pipeline to be detected, an eddy current coil and a plurality of excitation coil units.

[0006] The eddy current coil is circumferentially wound around the outer surface of the magnetostrictive strip; the eddy current coil is used as an excitation end and a receiving end eddy current coil to provide a dynamic excitation magnetic field for the magnetostrictive strip and convert the ultrasonic signal in the pipeline to be detected into an electrical signal.

[0007] The eddy current coil is also used as an exciting end eddy current coil to provide a dynamic excitation magnetic field for the magnetostrictive strip; the eddy current coil is also used as a receiving end eddy current coil to convert the ultrasonic signal in the pipeline to be detected into an electrical signal.

[0008] The excitation coil units are distributed at intervals on the magnetostrictive strip.

[0009] The excitation coil of each of the excitation coil units is axially wound on the wall surface of the magnetostrictive strip; the excitation coil of each of the excitation coil units is used to provide a bias magnetic field for the magnetostrictive strip.

[0010] In a second aspect, the present application provides an electromagnetic ultrasonic detection device, comprising: a first signal exciter, a first signal receiver, a first excitation power supply, a duplexer and a first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0011] The first pipeline magnetostrictive electromagnetic ultrasonic transducer is the pipeline magnetostrictive electromagnetic ultrasonic transducer; the eddy current coil in the first pipeline magnetostrictive electromagnetic ultrasonic transducer serves as the eddy current coil at the excitation end and the receiving end.

[0012] The output end of the first signal exciter and the input end of the signal receiver are connected to the duplexer.

[0013] The first signal exciter is used to output an excitation signal of the eddy current coil in the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0014] The duplexer is used to isolate the excitation signal and the receiving signal in the eddy current coil to receive the excitation signal output by the first signal exciter and transmit it to the eddy current coil, and to receive the electrical signal output by the eddy current coil and transmit it to the first signal receiver.

[0015] The first signal receiver is used to receive, display and collect the electrical signal output by the eddy current coil in the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0016] The first excitation power supply is used to generate a pulse signal and transmit it to the excitation coil of the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0017] In a third aspect, the present application provides an electromagnetic ultrasonic detection device, including: a second signal exciter, a second signal receiver, a second excitation power supply, a second pipeline magnetostrictive electromagnetic ultrasonic transducer, and a third pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0018] The second pipeline magnetostrictive electromagnetic ultrasonic transducer and the third pipeline magnetostrictive electromagnetic ultrasonic transducer are the pipeline magnetostrictive electromagnetic ultrasonic transducers; the eddy current coil in the second pipeline magnetostrictive electromagnetic ultrasonic transducer serves as the excitation end eddy current coil; the eddy current coil in the third pipeline magnetostrictive electromagnetic ultrasonic transducer serves as the receiving end eddy current coil.

[0019] The second signal exciter is used to output an excitation signal of the eddy current coil at the excitation end.

[0020] The second signal receiver is used to receive the electrical signal output by the eddy current coil at the receiving end.

[0021] The second excitation power supply is used to generate a pulse signal and transmit it to the excitation coils in the second pipeline magnetostrictive electromagnetic ultrasonic transducer and the third pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0022] In a fourth aspect, the present application provides a pipeline defect detection method based on the electromagnetic ultrasonic detection device, comprising the following steps.

[0023] Acquire a signal collected by a signal receiver; the signal collected by the signal receiver refers to an electrical signal output by an eddy current coil in a first pipe magnetostrictive electromagnetic ultrasonic transducer received by a first signal receiver in the electromagnetic ultrasonic detection device, or an electrical signal output by an eddy current coil at a receiving end in a second pipe magnetostrictive electromagnetic ultrasonic transducer received by a second signal receiver in the electromagnetic ultrasonic detection device.

[0024] Defect information in the pipeline to be inspected is detected according to the signal collected by the signal receiver.

[0025] According to the specific embodiments provided in this application, this application discloses the following technical effects.

[0026] The present application provides a pipeline magnetostrictive electromagnetic ultrasonic transducer, a detection device and a method. According to the requirements of the actual high-temperature online detection environment for the high-temperature resistance, conversion efficiency and other capabilities of the electromagnetic ultrasonic transducer, a pipeline magnetostrictive electromagnetic ultrasonic transducer based on an excitation coil is designed. On the one hand, an excitation coil structure is designed. The use of the excitation coil structure avoids the high-temperature demagnetization problem of the permanent magnet and realizes high-temperature online guided wave monitoring and evaluation of the metal pipeline; on the other hand, a sparse excitation coil is used to make full use of the high magnetic permeability characteristics of the magnetostrictive strip, ensure the uniformity of the magnetostrictive deformation, increase the contact area between the magnetostrictive strip and the pipeline, and improve the conversion efficiency of the electromagnetic ultrasonic transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a pipeline magnetostrictive electromagnetic ultrasonic transducer provided in Example 1 of the present application.

[0029] Figure 2 This is a schematic diagram of the structure of another pipeline magnetostrictive electromagnetic ultrasonic transducer provided in Example 1 of the present application.

[0030] Figure 3 This is a schematic diagram of the structure of an electromagnetic ultrasonic detection device provided in Example 2 of the present application.

[0031] Figure 4 This is a schematic diagram of the structure of an electromagnetic ultrasonic detection device provided in Example 3 of the present application.

[0032] Figure 5 This is a schematic flow chart of a pipeline defect detection method provided in Example 4 of the present application.

[0033] The reference numerals are as follows.

[0034] 1——first magnetostrictive strip; 2——eddy current coils at the excitation end and the receiving end; 3——first excitation coil unit; 4——second magnetostrictive strip; 5——third magnetostrictive strip; 6——eddy current coils at the excitation end; 7——eddy current coils at the receiving end; 8——second excitation coil unit; 9——third excitation coil unit; 10——first excitation power supply; 11——duplexer; 12——signal generator; 13——power amplifier; 14——preamplifier; 15——oscilloscope; 16——second excitation power supply; 17——pipeline to be detected. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] The purpose of the present application is to provide a pipeline magnetostrictive electromagnetic ultrasonic transducer, a detection device and a method, aiming to solve the problem of low electromagnetic ultrasonic detection efficiency caused by high-temperature demagnetization of the permanent magnet part in the existing electromagnetic ultrasonic transducer during high-temperature online detection.

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] Example 1

[0039] This embodiment provides a pipeline magnetostrictive electromagnetic ultrasonic transducer, specifically a pipeline magnetostrictive electromagnetic ultrasonic transducer based on a sparse excitation coil, which is used to excite and receive ultrasonic guided waves in a pipeline to be detected 17. The pipeline magnetostrictive electromagnetic ultrasonic transducer includes: a magnetostrictive strip disposed on the outer surface of the pipeline to be detected, an eddy current coil, and a plurality of excitation coil units.

[0040] The eddy current coil is circumferentially wound around the outer surface of the magnetostrictive strip; the eddy current coil is used as an excitation end and a receiving end. The eddy current coil 2 provides a dynamic excitation magnetic field for the magnetostrictive strip and converts the ultrasonic signal in the pipeline to be detected into an electrical signal.

[0041] The eddy current coil is also used as an exciting end eddy current coil to provide a dynamic excitation magnetic field for the magnetostrictive strip; the eddy current coil is also used as a receiving end eddy current coil to convert the ultrasonic signal in the pipeline to be detected into an electrical signal.

[0042] The excitation coil units are distributed at intervals on the first magnetostrictive strip.

[0043] The excitation coil of each of the excitation coil units is axially wound on the wall surface of the magnetostrictive strip; the excitation coil of each of the excitation coil units is used to provide a bias magnetic field for the magnetostrictive strip.

[0044] As an optional implementation, when the eddy current coil of the pipeline magnetostrictive electromagnetic ultrasonic transducer is used as the excitation end and the receiving end eddy current coil 2, the pipeline magnetostrictive electromagnetic ultrasonic transducer is connected to the duplexer in the "self-transmitting and self-receiving" working mode. Figure 1 As shown, the pipeline magnetostrictive electromagnetic ultrasonic transducer includes: a first magnetostrictive strip 1 arranged on the outer surface of the pipeline 17 to be detected, an excitation end and a receiving end eddy current coil 2 and a plurality of first excitation coil units 3.

[0045] The first magnetostrictive strip 1 is adhered to the outer surface of the pipe along the circumferential direction through a coupling agent.

[0046] The eddy current coils 2 at the excitation end and the receiving end are circumferentially wound around the outer surface of the first magnetostrictive strip 1; the eddy current coils 2 at the excitation end and the receiving end are eddy current coils having both signal excitation function and signal receiving function, that is, the eddy current coils 2 at the excitation end and the receiving end are used to provide a dynamic excitation magnetic field for the first magnetostrictive strip 1 and convert the ultrasonic signal in the pipeline 17 to be detected into an electrical signal.

[0047] The first excitation coil units 3 are distributed on the first magnetostrictive strip 1 at intervals, for example, in the form of a sparse array.

[0048] The excitation coil of each of the first excitation coil units 3 is axially wound on the wall surface (inner wall surface and outer wall surface) of the first magnetostrictive strip 1; the excitation coil of each of the first excitation coil units 3 is used to provide a bias magnetic field for the first magnetostrictive strip 1.

[0049] As another optional implementation, when the two pipeline magnetostrictive electromagnetic ultrasonic transducers are in the "one transmit and one receive" working mode, the eddy current coil of one pipeline magnetostrictive electromagnetic ultrasonic transducer is used as the exciting end eddy current coil, and the eddy current coil of the other pipeline magnetostrictive electromagnetic ultrasonic transducer is used as the receiving end eddy current coil. Figure 2 As shown, the structure formed by two pipeline magnetostrictive electromagnetic ultrasonic transducers includes: a second magnetostrictive strip 4 and a third magnetostrictive strip 5 arranged at intervals on the outer surface of the pipeline 17 to be detected, an eddy current coil 6 at the excitation end, an eddy current coil 7 at the receiving end, a plurality of second excitation coil units 8 and a plurality of third excitation coil units 9.

[0050] The excitation end eddy current coil 6 is circumferentially wound around the outer surface of the second magnetostrictive strip 4 ; the excitation end eddy current coil 6 is used to provide a dynamic excitation magnetic field for the second magnetostrictive strip 4 .

[0051] The receiving end eddy current coil 7 is circumferentially wound around the outer surface of the third magnetostrictive strip 5 ; the receiving end eddy current coil 7 is used to convert the ultrasonic signal in the pipeline 17 to be detected into an electrical signal.

[0052] The second excitation coil units 8 are distributed on the second magnetostrictive strip 4 at intervals.

[0053] The third excitation coil units 9 are distributed on the third magnetostrictive strip 5 at intervals.

[0054] The excitation coil of each second excitation coil unit 8 is axially wound on the wall surface (inner wall surface and outer wall surface) of the second magnetostrictive strip 4; the excitation coil of each second excitation coil unit 8 is used to provide a bias magnetic field for the second magnetostrictive strip 4.

[0055] The excitation coil of each of the third excitation coil units 9 is axially wound on the wall surface (inner wall surface and outer wall surface) of the third magnetostrictive strip 5 ; the excitation coil of each of the third excitation coil units 9 is used to provide a bias magnetic field for the third magnetostrictive strip 5 .

[0056] This embodiment has the following advantages:

[0057] (1) The high magnetostrictive coefficient of the magnetostrictive strip improves the transduction efficiency of electromagnetic ultrasound, overcoming the problem of low signal-to-noise ratio of traditional electromagnetic ultrasonic detection signals.

[0058] (2) The excitation coil is used instead of the permanent magnet, which avoids the demagnetization problem of the permanent magnet caused by high temperature environment and improves the heat resistance of the transducer.

[0059] (3) The electromagnetic ultrasonic transducer of the present invention is a pipeline magnetostrictive electromagnetic ultrasonic based on a sparse excitation coil. The sparse excitation coil structure is adopted to increase the contact area between the magnetostrictive strip and the pipeline to be detected 17, reduce the energy loss of the ultrasonic wave propagating from the transducer to the pipeline to be detected 17, and thus improve the propagation efficiency of the ultrasonic wave between the magnetostrictive strip and the pipeline to be detected 17, thereby improving the energy efficiency of the electromagnetic ultrasonic transducer.

[0060] (4) The electromagnetic ultrasonic transducer of the present invention has a simple structure and is easy to operate, and can realize long-term electromagnetic ultrasonic online detection of high-temperature pipelines, thus having a better market application prospect.

[0061] Example 2

[0062] This embodiment provides an electromagnetic ultrasonic detection device, such as Figure 3 As shown, it includes: a first signal exciter, a first signal receiver, a first excitation power supply 10, a duplexer 11 and a first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0063] The first pipeline magnetostrictive electromagnetic ultrasonic transducer is the pipeline magnetostrictive electromagnetic ultrasonic transducer in the first optional implementation manner in Example 1.

[0064] The output end of the first signal exciter and the input end of the signal receiver are connected to the duplexer 11. The excitation end and the receiving end eddy current coil 2 are connected to the duplexer 11.

[0065] The first signal exciter is used to output excitation signals of the eddy current coils 2 at the excitation end and the receiving end in the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0066] The duplexer 11 is used to isolate the excitation signal and the receiving signal in the eddy current coil to receive the excitation signal output by the first signal exciter and transmit it to the excitation end and receiving end eddy current coil 2, and receive the electrical signal output by the excitation end and receiving end eddy current coil 2 and transmit it to the first signal receiver. The isolation function of the duplexer for the excitation and receiving signals can ensure that the excitation and reception of the eddy current coil can work normally at the same time.

[0067] The first signal receiver is used to receive, display and collect the electrical signals output by the eddy current coils 2 at the excitation end and the receiving end of the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0068] The first excitation power supply 10 is connected to the excitation coil of the first pipeline magnetostrictive electromagnetic ultrasonic transducer, and is used to generate a pulse signal and transmit it to the excitation coil of the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0069] As an optional implementation, the first signal exciter includes a signal generator 12 and a power amplifier 13. As an example, the output frequency of the signal generator 12 is 0.5-5 MHz, and the pulse repetition frequency is 1-1 kHz.

[0070] As an optional implementation, a first trigger is further provided between the signal generator 12 and the first excitation power supply 10 .

[0071] The first trigger is used to use the first excitation power supply 10 to trigger the signal generator 12 to output an excitation signal.

[0072] The signal generator 12 of the first signal exciter is connected to the corresponding power amplifier 13, and is used to send the excitation signal of the eddy current coil 2 at the excitation end and the receiving end and transmit it to the power amplifier 13. The signal generator 12 can generate an excitation signal (pulse signal) of any waveform.

[0073] The power amplifier 13 of the first signal exciter is connected to the eddy current coil 2 at the excitation end and the receiving end, and is used to amplify the excitation signal output by the first signal generator 12 and transmit the amplified signal to the eddy current coil 2 at the excitation end and the receiving end.

[0074] As an optional implementation manner, the first signal receiver includes a preamplifier 14 and an oscilloscope 15 .

[0075] The preamplifier 14 of the first signal receiver is connected to the eddy current coils 2 at the excitation end and the receiving end, and is used to amplify the electrical signals output by the eddy current coils 2 at the excitation end and the receiving end, and transmit the amplified signals to the oscilloscope 15 .

[0076] The oscilloscope 15 of the first signal receiver is connected to the corresponding preamplifier 14 and is used to display and collect the signal output by the preamplifier 14 .

[0077] In this embodiment, by installing a duplexer 11 between the eddy current coil and the power amplifier 13, only one magnetostrictive strip with an eddy current coil and an excitation coil is used to implement "self-generating and self-receiving" ultrasonic testing of the pipeline 17 to be tested.

[0078] Example 3

[0079] This embodiment provides an electromagnetic ultrasonic detection device, such as Figure 4 As shown, it includes: a second signal exciter, a second signal receiver, a second excitation power supply 16, a second pipeline magnetostrictive electromagnetic ultrasonic transducer and a third pipeline magnetostrictive electromagnetic ultrasonic transducer. The two pipeline magnetostrictive electromagnetic ultrasonic transducers are in a "one-transmit and one-receive" working mode.

[0080] The second pipeline magnetostrictive electromagnetic ultrasonic transducer is the eddy current coil in the pipeline magnetostrictive electromagnetic ultrasonic transducer in the second optional implementation manner in Example 1, wherein the eddy current coil in the second pipeline magnetostrictive electromagnetic ultrasonic transducer serves as the excitation end eddy current coil 6.

[0081] The third pipeline magnetostrictive electromagnetic ultrasonic transducer is the pipeline magnetostrictive electromagnetic ultrasonic transducer in the second optional implementation manner in Example 1, wherein the eddy current coil in the third pipeline magnetostrictive electromagnetic ultrasonic transducer serves as the receiving end eddy current coil 7.

[0082] The second signal exciter is used to output an excitation signal of the eddy current coil 6 at the excitation end of the second pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0083] The second signal receiver is used to receive the electrical signal output by the eddy current coil 7 at the receiving end of the second pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0084] The second excitation power supply 16 is connected to the excitation coil of the second pipeline magnetostrictive electromagnetic ultrasonic transducer, and is used to generate a pulse signal and transmit it to the excitation coil of the second pipeline magnetostrictive electromagnetic ultrasonic transducer.

[0085] As an optional implementation, the second signal exciter includes a signal generator 12 and a power amplifier 13; as an example, the output frequency of the signal generator 12 is 0.5-5 MHz, and the pulse repetition frequency is 1-1 kHz.

[0086] As an optional implementation, a second trigger is further provided between the signal generator 12 and the second excitation power supply 16 .

[0087] The second trigger is used to use the second excitation power supply 16 to trigger the signal generator 12 to output an excitation signal.

[0088] The signal generator 12 of the second signal exciter is connected to the corresponding power amplifier 13 , and is used to send out the excitation signal of the eddy current coil 7 at the receiving end and transmit it to the power amplifier 13 .

[0089] The power amplifier 13 of the second signal exciter is connected to the eddy current coil 6 at the excitation end, and is used to amplify the excitation signal output by the second signal generator 12 and transmit the amplified signal to the eddy current coil 6 at the excitation end.

[0090] As an optional implementation manner, the second signal receiver includes a preamplifier 14 and an oscilloscope 15 .

[0091] The preamplifier 14 of the second signal receiver is connected to the eddy current coil 7 at the receiving end, and is used to amplify the electrical signal output by the eddy current coil 7 at the receiving end, and transmit the amplified signal to the oscilloscope 15 .

[0092] The oscilloscope 15 of the second signal receiver is connected to the corresponding preamplifier 14 and is used to display and collect the signal output by the preamplifier 14 .

[0093] In this embodiment, different from Embodiment 2, two magnetostrictive strips with eddy current coils and excitation coils are designed and arranged at intervals on the pipeline 17 to be inspected, wherein the eddy current coil on one magnetostrictive strip has only the function of signal excitation, and the eddy current coil on the other magnetostrictive strip has only the function of signal reception.

[0094] Example 4

[0095] like Figure 5 As shown, this embodiment provides a pipeline defect detection method based on the electromagnetic ultrasonic detection device described in Example 2 or Example 3, wherein the pipeline defect detection method includes:

[0096] S1: Acquire the signal collected by the signal receiver; the signal collected by the signal receiver refers to the electrical signal output by the eddy current coil 2 at the excitation end and the receiving end of the first pipe magnetostrictive electromagnetic ultrasonic transducer received by the first signal receiver in the electromagnetic ultrasonic detection device described in Example 2, or the electrical signal output by the eddy current coil 7 at the receiving end of the third pipe magnetostrictive electromagnetic ultrasonic transducer received by the second signal receiver in the electromagnetic ultrasonic detection device described in Example 3.

[0097] Before obtaining the signal collected by the signal receiver, it is necessary to first control the excitation signal of the eddy current coil through the signal generator, and set the waveform, amplitude, frequency and other parameters of the excitation signal; control the excitation signal of the excitation coil through the excitation power supply, and set the waveform, amplitude, frequency and other parameters of the excitation signal; set the amplification factor and power of the power amplifier and other parameters; turn on the excitation power supply, and trigger the excitation signal of the signal generator through the trigger circuit; adjust the amplification factor of the preamplifier, and display and collect the received signal in the eddy current coil through the oscilloscope.

[0098] S2: Detecting defect information in the pipeline 17 to be inspected according to the signal collected by the signal receiver.

[0099] The defect detection algorithm used in this step is a more traditional defect identification and analysis algorithm. The signal collected by the signal receiver generally includes the direct wave packet from the excitation end sensor (only available in the "one-transmit-one-receive" mode), the defect wave packet from the defect, and the reflected wave packet from the end surface. The source of each wave packet is inferred by the wave velocity of the ultrasonic wave in the pipeline and the time of each wave packet. After confirming the defect wave packet, the defect position is calculated according to the wave packet time, thereby realizing the identification and positioning of the defect.

[0100] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A pipeline magnetostrictive electromagnetic ultrasonic transducer, characterized in that: The pipeline magnetostrictive electromagnetic ultrasonic transducer comprises: a magnetostrictive strip arranged on the outer surface of the pipeline to be detected, an eddy current coil and a plurality of excitation coil units; The eddy current coil is circumferentially wound around the outer surface of the magnetostrictive strip; the eddy current coil is used as an excitation end and a receiving end eddy current coil to provide a dynamic excitation magnetic field for the magnetostrictive strip and convert the ultrasonic signal in the pipeline to be detected into an electrical signal; The eddy current coil is also used as an exciting end eddy current coil to provide a dynamic excitation magnetic field for the magnetostrictive strip; the eddy current coil is also used as a receiving end eddy current coil to convert the ultrasonic signal in the pipeline to be detected into an electrical signal; The excitation coil units are spaced apart and distributed on the magnetostrictive strip; The excitation coil of each of the excitation coil units is axially wound on the wall surface of the magnetostrictive strip; the excitation coil of each of the excitation coil units is used to provide a bias magnetic field for the magnetostrictive strip.

2. An electromagnetic ultrasonic detection device, characterized in that: The electromagnetic ultrasonic detection device comprises: a first signal exciter, a first signal receiver, a first excitation power supply, a duplexer and a first pipeline magnetostrictive electromagnetic ultrasonic transducer; The first pipeline magnetostrictive electromagnetic ultrasonic transducer is the pipeline magnetostrictive electromagnetic ultrasonic transducer according to claim 1; the eddy current coil in the first pipeline magnetostrictive electromagnetic ultrasonic transducer serves as the eddy current coil at the excitation end and the receiving end; The output end of the first signal exciter and the input end of the signal receiver are connected to the duplexer; The first signal exciter is used to output an excitation signal of the eddy current coil in the first pipeline magnetostrictive electromagnetic ultrasonic transducer; The duplexer is used to isolate the excitation signal and the receiving signal in the eddy current coil to receive the excitation signal output by the first signal exciter and transmit it to the eddy current coil, and to receive the electrical signal output by the eddy current coil and transmit it to the first signal receiver; The first signal receiver is used to receive, display and collect the electrical signal output by the eddy current coil in the first pipeline magnetostrictive electromagnetic ultrasonic transducer; The first excitation power supply is used to generate a pulse signal and transmit it to the excitation coil of the first pipeline magnetostrictive electromagnetic ultrasonic transducer.

3. The electromagnetic ultrasonic detection device according to claim 2, characterized in that: The first signal exciter includes a signal generator and a power amplifier; The signal generator is used to send out an excitation signal of the eddy current coil and transmit it to the power amplifier; The power amplifier is used to amplify the excitation signal output by the signal generator and transmit the amplified signal to the eddy current coil.

4. The electromagnetic ultrasonic detection device according to claim 3, characterized in that: A first trigger is also provided between the signal generator and the first excitation power supply; The first trigger is used to use the first excitation power supply to trigger the signal generator to output an excitation signal.

5. The electromagnetic ultrasonic detection device according to claim 2, characterized in that: The first signal receiver includes a preamplifier and an oscilloscope; The preamplifier is used to amplify the electrical signal output by the eddy current coil and transmit the amplified signal to the oscilloscope; The oscilloscope is used to display and collect the signal output by the preamplifier.

6. An electromagnetic ultrasonic detection device, characterized in that: The electromagnetic ultrasonic detection device comprises: a second signal exciter, a second signal receiver, a second excitation power supply, a second pipeline magnetostrictive electromagnetic ultrasonic transducer and a third pipeline magnetostrictive electromagnetic ultrasonic transducer; The second pipeline magnetostrictive electromagnetic ultrasonic transducer and the third pipeline magnetostrictive electromagnetic ultrasonic transducer are the pipeline magnetostrictive electromagnetic ultrasonic transducers according to claim 1; the eddy current coil in the second pipeline magnetostrictive electromagnetic ultrasonic transducer is used as an eddy current coil at the excitation end; the eddy current coil in the third pipeline magnetostrictive electromagnetic ultrasonic transducer is used as an eddy current coil at the receiving end; The second signal exciter is used to output an excitation signal of the eddy current coil at the excitation end; The second signal receiver is used to receive the electrical signal output by the eddy current coil at the receiving end; The second excitation power supply is used to generate a pulse signal and transmit it to the excitation coils in the second pipeline magnetostrictive electromagnetic ultrasonic transducer and the third pipeline magnetostrictive electromagnetic ultrasonic transducer.

7. The electromagnetic ultrasonic detection device according to claim 6, characterized in that: A second trigger is also provided between the second signal generator and the second excitation power supply; The second trigger is used to use the second excitation power supply to trigger the second signal exciter to output an excitation signal.

8. A pipeline defect detection method based on the electromagnetic ultrasonic detection device according to claim 2 or 6, characterized in that: The pipeline defect detection method comprises: Acquire a signal collected by a signal receiver; the signal collected by the signal receiver refers to an electrical signal output by an eddy current coil in a first pipe magnetostrictive electromagnetic ultrasonic transducer received by a first signal receiver in the electromagnetic ultrasonic detection device according to claim 2, or an electrical signal output by an eddy current coil at a receiving end in a third pipe magnetostrictive electromagnetic ultrasonic transducer received by a second signal receiver in the electromagnetic ultrasonic detection device according to claim 6; Defect information in the pipeline to be inspected is detected according to the signal collected by the signal receiver.

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