Pipeline monitoring device and method based on ultrasonic phased array

Abstract

The invention discloses a pipeline monitoring device and method based on an ultrasonic phased array, and the method comprises the steps: a plurality of pulse excitation electric signals generated by a pulse transmitting and collecting unit are transmitted and converted through a transmitting coil and a receiving coil, and generated induction pulse electric signals are transmitted to a flexible ultrasonic array transducer; the flexible ultrasonic array transducer is used for detecting the loss of the detected object and converting an ultrasonic pulse signal into an electric pulse signal; the receiving coil and the transmitting coil perform transmission and conversion again, and the generated induction pulse voltage signal is sent to the pulse transmitting and collecting unit and is further converted into a digital voltage waveform signal; and the signal processing and imaging unit is used for processing and displaying the digital voltage waveform signal and imaging the internal structure in the detected object. According to the invention, the piezoelectric ceramic element is adhered to the flexible printed circuit substrate and is fixed on the detected pipeline structural member, so that the problem of continuous monitoring of pipeline defects is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing and relates to a pipeline monitoring device and method based on an ultrasonic phased array. Background Art

[0002] Nondestructive testing and structural health monitoring technologies are widely used to detect and evaluate defects, thereby avoiding accidents and losses caused by defects. Low-cost, high-resolution nondestructive testing and healthy structural monitoring equipment and technologies can play a key role in early monitoring and early warning of defects. Ultrasonic phased array detection and imaging equipment has been widely used in nondestructive testing and structural health testing due to its wide range of material applicability, sensitivity to tiny defects and characterization of multiple defects. Ultrasonic phased array detection and imaging equipment can provide high-resolution images of the inside of the object being tested, and can analyze and locate defects with high accuracy. However, the current ultrasonic phased array equipment has the limitations of high cost and large size, so it is often used for regular defect detection during equipment maintenance, and cannot capture and analyze the changes in tiny defects inside the object being tested. Nondestructive testing equipment and technology based on X-Ray can improve sufficient resolution, but due to the presence of radiation, it has more requirements on the application environment and cannot meet the application requirements of long-term structural health monitoring in industrial environments. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the ultrasonic phased array equipment in the prior art cannot capture and analyze the changes of tiny defects inside the object being inspected, and the non-destructive testing equipment and technology based on X-Ray cannot meet the needs of long-term structural health monitoring in industrial environments due to the presence of radiation. A pipeline monitoring device and method based on ultrasonic phased array are provided.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A pipeline monitoring device based on ultrasonic phased array, comprising: a pulse transmitting and collecting unit, a transmitting coil, a receiving coil, a flexible ultrasonic array transducer, a signal processing and imaging unit and a display;

[0006] The pulse transmitting and collecting unit is used to generate a number of pulse excitation electrical signals and send them to the transmitting coil; the transmitting coil is used to convert the pulse excitation electrical signals into pulse electromagnetic fields; the receiving coil generates induced pulse electrical signals according to the pulse electromagnetic fields, and transmits the induced pulse electrical signals to the flexible ultrasonic array transducer;

[0007] The flexible ultrasonic array transducer converts the induced pulse electrical signal into ultrasonic waves, and the flexible ultrasonic array transducer is arranged on the object to be inspected. The ultrasonic waves are transmitted to the inside of the object to be inspected through the coupling medium. The flexible ultrasonic array transducer is used to capture the ultrasonic pulse signal reflected from the inside of the object to be inspected, and convert the ultrasonic pulse signal into an electrical pulse signal; the receiving coil is also used to receive the electrical pulse signal sent by the flexible ultrasonic array transducer, and convert the electrical pulse signal into an electromagnetic radio frequency pulse signal; the transmitting coil is also used to convert the electromagnetic radio frequency pulse signal into an induced pulse voltage signal;

[0008] The pulse emission and acquisition unit is also used to convert the induced pulse voltage signal into a digital voltage waveform signal. The signal processing and imaging unit processes and displays the digital voltage waveform signal, and images the internal structure of the detected object through an imaging algorithm. The display is connected to the signal processing and imaging unit to display the image inside the detected object.

[0009] A further improvement of the present invention is:

[0010] Furthermore, the flexible ultrasonic array transducer includes a piezoelectric ceramic element, a plurality of array elements and a flexible printed circuit substrate, wherein the piezoelectric ceramic element and the array element are both arranged on the flexible printed circuit substrate; the piezoelectric ceramic element converts the induced pulse electrical signal into an ultrasonic wave; the array element transmits the ultrasonic wave to the interior of the detected object via a coupling medium; after the ultrasonic wave is transmitted to the interior of the detected object, the array element receives the ultrasonic wave signal reflected by the detected object, and converts the ultrasonic wave signal into a corresponding electrical pulse signal through the piezoelectric ceramic element, and sends it to the receiving coil.

[0011] Furthermore, the transmitting coil and the receiving coil are arranged opposite to each other.

[0012] Furthermore, the coil layout of the transmitting coil and the receiving coil is the same as the layout of the flexible ultrasonic array transducer, and each transmitting coil and receiving coil is placed in an independent shielding space to avoid mutual interference between the coils.

[0013] Furthermore, the interface between the transmitting coil and the receiving coil is shielded by metal.

[0014] Furthermore, the pulse emission and collection unit includes an analog-to-digital conversion module, which converts the induced pulse voltage signal into a digital voltage waveform signal.

[0015] Furthermore, the receiving coil is connected to the flexible ultrasonic array transducer via an extended wire.

[0016] A pipeline monitoring method based on ultrasonic phased array, comprising:

[0017] When the pulse emission and acquisition unit generates several pulse excitation electrical signals, the transmitting coil converts the pulse excitation electrical signals into a pulse electromagnetic field; the receiving coil generates an induced pulse electrical signal according to the pulse electromagnetic field, and the flexible ultrasonic array transducer converts the induced pulse electrical signal into an ultrasonic wave, which is transmitted to the inside of the object under test through the coupling medium, and the ultrasonic pulse signal reflected from the inside of the object under test is captured and transmitted to the flexible ultrasonic array transducer, and the ultrasonic pulse signal is converted into an electrical pulse signal;

[0018] The receiving coil converts the electrical pulse signal into an electromagnetic radio frequency pulse signal; the transmitting coil converts the electromagnetic radio frequency pulse signal into an induced pulse voltage signal; the pulse emission and acquisition unit converts the induced pulse voltage signal into a digital voltage waveform signal; the signal processing and imaging unit processes and displays the digital voltage waveform signal, and images the internal structure of the object being detected through an imaging algorithm; and displays the image inside the object being detected through a display screen.

[0019] Furthermore, the signal processing and imaging unit processes and displays the digital voltage waveform signal, and images the internal structure of the detected object through an imaging algorithm, specifically:

[0020] Based on the collected induction pulse voltage signal, the structural thickness of each point of each detected object is calculated;

[0021] Based on the collected induced pulse voltage signal, the internal structure of the object being detected is quickly imaged using full focusing or ultrasonic full focusing imaging algorithms based on rapid phase shift migration.

[0022] Furthermore, based on the collected induction pulse voltage signal, the structural thickness of each point of each detected object is calculated, specifically:

[0023] The thickness of the object under test is obtained based on the interval time between adjacent pulses, as shown in the formula,

[0024] Δt×v=2×l

[0025] Wherein, Δt represents the interval time between adjacent pulses, v is the propagation speed of ultrasound in the object being detected, and l is the thickness measurement result of the object being detected at the array element.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention generates several pulse excitation electrical signals through a pulse emission and acquisition unit, and transmits and converts the generated induced pulse electrical signals to a flexible ultrasonic array transducer through transmission and conversion of a transmitting coil and a receiving coil. The flexible ultrasonic array transducer detects the loss of the object to be inspected and converts the ultrasonic pulse signal into an electrical pulse signal; the receiving coil and the transmitting coil transmit and convert again, and send the generated induced pulse voltage signal to the pulse emission and acquisition unit, and further convert it into a digital voltage waveform signal; the signal processing and imaging unit processes and displays the digital voltage waveform signal, and images the internal structure of the object to be inspected through an imaging algorithm. The present invention adopts an array miniaturization solution, which can reduce the manufacturing cost of the entire array system; the wireless passive excitation and acquisition method can effectively reduce the monitoring cost and improve the monitoring efficiency. The present invention bonds the piezoelectric ceramic element to a flexible printed circuit substrate, which can be permanently or semi-permanently fixed on the pipeline structure to be inspected, thereby solving the problem that the existing pipeline defect monitoring equipment cannot perform high-resolution continuous monitoring of pipeline defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of the structure of a pipeline monitoring device based on an ultrasonic phased array of the present invention;

[0030] Figure 2 Another structural schematic diagram of the pipeline monitoring device based on ultrasonic phased array of the present invention;

[0031] Figure 3 It is a schematic diagram of a transmitting coil and a receiving coil with a shielding function of the present invention;

[0032] Figure 4 It is a schematic diagram showing various induced pulse voltage signals generated by the transmitting end coil collected by the pulse transmitting and collecting unit on the display.

[0033] Among them, 1-pulse emission and acquisition unit; 2-transmitting coil; 3-receiving coil; 4-flexible ultrasonic array transducer; 5-signal processing and imaging unit; 6-display. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0041] See also Figure 1 , the present invention discloses a pipeline monitoring device based on ultrasonic phased array, comprising: a pulse transmitting and collecting unit 1, a transmitting coil 2, a receiving coil 3, a flexible ultrasonic array transducer 4, a signal processing and imaging unit 5 and a display 6;

[0042] The pulse emission and acquisition unit 1 is used to generate a plurality of pulse excitation electrical signals and send them to the transmitting coil 2; the transmitting coil 2 is used to convert the pulse excitation electrical signals into a pulse electromagnetic field; the receiving coil 3 generates an induced pulse electrical signal according to the pulse electromagnetic field, and transmits the induced pulse electrical signal to the flexible ultrasonic array transducer 4; the flexible ultrasonic array transducer 4 converts the induced pulse electrical signal into an ultrasonic wave, and the flexible ultrasonic array transducer 4 is arranged on the object to be detected, and the ultrasonic wave is transmitted to the inside of the object to be detected through the coupling medium, and the flexible ultrasonic array transducer 4 is used to capture the ultrasonic pulse signal reflected inside the object to be detected, and convert the ultrasonic pulse signal into an electrical pulse signal; the receiving coil 3 is also used to receive the electrical pulse signal sent by the flexible ultrasonic array transducer 4, and convert the electrical pulse signal into an electromagnetic radio frequency pulse signal; the transmitting coil 2 is also used to convert the electromagnetic radio frequency pulse signal into an induced pulse voltage signal; the pulse emission and acquisition unit 1 is also used to convert the induced pulse voltage signal into a digital voltage waveform signal; the signal processing and imaging unit 5 processes and displays the digital voltage waveform signal, and images the internal structure inside the object to be detected through an imaging algorithm; the display 6 is connected to the signal processing and imaging unit, and is used to display an image inside the object to be detected.

[0043] The flexible ultrasonic array transducer 4 includes a piezoelectric ceramic element, a plurality of array elements and a flexible printed circuit substrate, and the piezoelectric ceramic element and the array element are both arranged on the flexible printed circuit substrate; the piezoelectric ceramic element converts the induced pulse electrical signal into an ultrasonic wave; the array element transmits the ultrasonic wave to the inside of the detected object through a coupling medium; after the ultrasonic wave is transmitted to the inside of the detected object, the array element receives the ultrasonic wave signal reflected by the detected object, and converts the ultrasonic wave signal into a corresponding electrical pulse signal through the piezoelectric ceramic element, and sends it to the receiving coil 3. The transmitting coil 2 is arranged opposite to the receiving coil 3. The coil layout of the transmitting coil 2 and the receiving coil 3 is the same as that of the flexible ultrasonic array transducer 4, and each transmitting coil 2 and receiving coil 3 is placed in an independent shielding space to avoid mutual interference between the coils.

[0044] The interface between the transmitting coil 2 and the receiving coil 3 is shielded by metal. The pulse transmitting and collecting unit 1 includes an analog-to-digital conversion module, which converts the induced pulse voltage signal into a digital voltage waveform signal. The receiving coil 3 is connected to the flexible ultrasonic array transducer 4 through an extended wire.

[0045] A pipeline monitoring method based on ultrasonic phased array, comprising:

[0046] When the pulse emission and acquisition unit 1 generates a number of pulse excitation electrical signals, the transmitting coil 2 converts the pulse excitation electrical signals into a pulse electromagnetic field; the receiving coil 3 generates an induced pulse electrical signal according to the pulse electromagnetic field, and the flexible ultrasonic array transducer 4 converts the induced pulse electrical signal into an ultrasonic wave, which is transmitted to the inside of the object under test through the coupling medium, and the ultrasonic pulse signal reflected from the inside of the object under test is captured and transmitted to the flexible ultrasonic array transducer 4, and the ultrasonic pulse signal is converted into an electrical pulse signal;

[0047] The receiving coil 3 converts the electric pulse signal into an electromagnetic radio frequency pulse signal; the transmitting coil 2 converts the electromagnetic radio frequency pulse signal into an induced pulse voltage signal; the pulse transmitting and collecting unit 1 converts the induced pulse voltage signal into a digital voltage waveform signal; the signal processing and imaging unit 5 processes and displays the digital voltage waveform signal, and images the internal structure of the detected object through an imaging algorithm; and displays the image inside the detected object through a display screen 6.

[0048] The signal processing and imaging unit processes and displays the digital voltage waveform signal, and uses the imaging algorithm to image the internal structure of the object being detected, specifically:

[0049] Based on the collected induction pulse voltage signal, the structural thickness of each point of each detected object is calculated;

[0050] Based on the collected induced pulse voltage signal, the internal structure of the object being detected is quickly imaged using full focusing or ultrasonic full focusing imaging algorithms based on rapid phase shift migration.

[0051] Based on the collected induction pulse voltage signal, the structural thickness of each point of each detected object is calculated, specifically:

[0052] The thickness of the object under test is obtained based on the interval time between adjacent pulses, as shown in the formula,

[0053] Δt×v=2×l

[0054] Wherein, Δt represents the interval time between adjacent pulses, v is the propagation speed of ultrasound in the object being detected, and l is the thickness measurement result of the object being detected at the array element.

[0055] Example:

[0056] See also Figure 2 , Figure 3 and Figure 4 The present invention discloses a pipeline monitoring device based on an ultrasonic phased array, comprising: a pulse transmitting and collecting unit, a signal processing and imaging unit, a transmitting coil, a receiving coil and a flexible ultrasonic array transducer.

[0057] The flexible ultrasonic array transducer can be arranged on the object to be inspected for a long time or even permanently. It adopts the design of a 4X4 phased array ultrasonic transducer with 16 array elements. The transmitting coil and the receiving coil are connected to the ultrasonic signal excitation and acquisition equipment, and the system has high-resolution imaging capabilities. The transmitting coil and the receiving coil adopt the same 4X4 layout scheme as the flexible ultrasonic array transducer. Each coil is placed in an independent shielding space, which can effectively avoid mutual interference between coils. The pulse transmission and acquisition unit is used to excite multiple (4X4) pulse electrical signals; the pulse transmission and acquisition unit is connected to the transmitting coil, and the pulse electrical signal generates a pulse electromagnetic field in the transmitting coil. The transmitting coil and the receiving coil are fixed in multiple (4X4) frequency-closed grids to generate 16 independent pulse electromagnetic fields; the transmitting coil and the receiving coil are arranged relative to each other, and the receiving coil generates an induced pulse electrical signal according to the pulse electromagnetic field, and transmits the signal to the ultrasonic linear array transducer; the ultrasonic linear array transducer converts the induced pulse electrical signal into an ultrasonic wave; the ultrasonic wave is transmitted to the inside of the object to be inspected through the coupling medium, and the ultrasonic array transducer is used to capture the ultrasonic pulse signal reflected by the inside of the object to be inspected. signal, and convert the ultrasonic pulse signal collected by each array element into an electric pulse signal corresponding to multiple array elements; each electric pulse signal is loaded onto the connected receiving coil and converted into multiple electromagnetic radio frequency pulse signals, and the transmitting coil converts the corresponding pulse electromagnetic field generated on the receiving coil into multiple (4X4) induced pulse voltage signals; the pulse emission and acquisition unit converts the induced pulse voltage signal into a digital voltage waveform signal through an analog-to-digital conversion module; the signal processing and imaging unit measures the thickness of the object to be detected according to the digital power supply signal of the 4X4 array transducer, and uses the full focusing TFM or the fast phase shift migration PSM method to image the internal structure of the object to be detected.

[0058] Optionally, the wireless passive transmitting coil and receiving coil can be replaced by a connector to reduce the monitoring cost. One end of the extension wire is connected to the receiving coil, and the other end is connected to the flexible ultrasonic array transducer, which can increase the distance between the flexible ultrasonic array transducer patch and the surface receiving coil to meet the monitoring needs of pipelines with thicker coatings.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipeline monitoring device based on ultrasonic phased array, characterized in that: include: A pulse transmission and collection unit (1), a transmitting coil (2), a receiving coil (3), a flexible ultrasonic array transducer (4), a signal processing and imaging unit (5) and a display (6); The pulse transmitting and collecting unit (1) is used to generate a plurality of pulse excitation electrical signals and send them to the transmitting coil (2); The transmitting coil (2) is used to convert the pulse excitation electrical signal into a pulse electromagnetic field; The receiving coil (3) generates an induced pulse electrical signal according to the pulse electromagnetic field, and transmits the induced pulse electrical signal to the flexible ultrasonic array transducer (4); The flexible ultrasonic array transducer (4) converts the induced pulse electrical signal into ultrasonic waves, and the flexible ultrasonic array transducer (4) is arranged on the object to be inspected, and the ultrasonic waves are transmitted to the inside of the object to be inspected via a coupling medium. The flexible ultrasonic array transducer (4) is used to capture the ultrasonic pulse signal reflected from the inside of the object to be inspected, and convert the ultrasonic pulse signal into an electrical pulse signal; The receiving coil (3) is also used to receive the electrical pulse signal sent by the flexible ultrasonic array transducer (4), and convert the electrical pulse signal into an electromagnetic radio frequency pulse signal; The transmitting coil (2) is also used to convert the electromagnetic radio frequency pulse signal into an induction pulse voltage signal; The pulse emission and collection unit (1) is also used to convert the induced pulse voltage signal into a digital voltage waveform signal; The signal processing and imaging unit (5) processes and displays the digital voltage waveform signal, and images the internal structure of the detected object through an imaging algorithm; the display (6) is connected to the signal processing and imaging unit and is used to display the image of the interior of the detected object.

2. The pipeline monitoring device based on ultrasonic phased array according to claim 1 is characterized in that: The flexible ultrasonic array transducer (4) comprises a piezoelectric ceramic element, a plurality of array elements and a flexible printed circuit substrate, wherein the piezoelectric ceramic element and the array element are both arranged on the flexible printed circuit substrate; the piezoelectric ceramic element converts an induced pulse electrical signal into an ultrasonic wave; the array element transmits the ultrasonic wave to the interior of the detected object via a coupling medium; after the ultrasonic wave is transmitted to the interior of the detected object, the array element receives the ultrasonic wave signal reflected by the detected object, and converts the ultrasonic wave signal into a corresponding electrical pulse signal through the piezoelectric ceramic element, and sends it to a receiving coil (3).

3. The pipeline monitoring device based on ultrasonic phased array according to claim 2 is characterized in that: The transmitting coil (2) and the receiving coil (3) are arranged opposite to each other.

4. The pipeline monitoring device based on ultrasonic phased array according to claim 3 is characterized in that: The coil layout of the transmitting coil (2) and the receiving coil (3) is the same as the layout of the flexible ultrasonic array transducer (4), and each transmitting coil (2) and receiving coil (3) is placed in an independent shielding space to avoid mutual interference between the coils.

5. The pipeline monitoring device based on ultrasonic phased array according to claim 4 is characterized in that: The interface between the transmitting coil (2) and the receiving coil (3) is shielded by metal.

6. The pipeline monitoring device based on ultrasonic phased array according to claim 5 is characterized in that: The pulse emission and collection unit (1) comprises an analog-to-digital conversion module, which converts the induced pulse voltage signal into a digital voltage waveform signal.

7. The pipeline monitoring device based on ultrasonic phased array according to claim 6 is characterized in that: The receiving coil (3) is connected to the flexible ultrasonic array transducer (4) via an extended wire.

8. A pipeline monitoring method based on ultrasonic phased array, applied to any pipeline monitoring device based on ultrasonic phased array according to any of claims 1 to 7, characterized in that: include: When the pulse emission and collection unit (1) generates a plurality of pulse excitation electrical signals, the transmitting coil (2) converts the pulse excitation electrical signals into a pulse electromagnetic field; the receiving coil (3) generates an induced pulse electrical signal according to the pulse electromagnetic field, and the flexible ultrasonic array transducer (4) converts the induced pulse electrical signal into an ultrasonic wave, which is transmitted to the inside of the object under test via a coupling medium, and the ultrasonic pulse signal reflected from the inside of the object under test is captured and transmitted to the flexible ultrasonic array transducer (4), and the ultrasonic pulse signal is converted into an electrical pulse signal; The receiving coil (3) converts the electric pulse signal into an electromagnetic radio frequency pulse signal; the transmitting coil (2) converts the electromagnetic radio frequency pulse signal into an induced pulse voltage signal; the pulse transmitting and collecting unit (1) converts the induced pulse voltage signal into a digital voltage waveform signal; the signal processing and imaging unit (5) processes and displays the digital voltage waveform signal, and images the internal structure of the detected object through an imaging algorithm; and displays the image of the inside of the detected object through a display screen (6).

9. The pipeline monitoring method based on ultrasonic phased array according to claim 8, characterized in that: The signal processing and imaging unit processes and displays the digital voltage waveform signal, and images the internal structure of the detected object through an imaging algorithm, specifically: Based on the collected induction pulse voltage signal, the structural thickness of each point of each detected object is calculated; Based on the collected induced pulse voltage signal, the internal structure of the object being detected is quickly imaged using full focusing or ultrasonic full focusing imaging algorithms based on rapid phase shift migration.

10. The pipeline monitoring method based on ultrasonic phased array according to claim 9, characterized in that: The method of calculating the structural thickness of each point of each detected object based on the collected induction pulse voltage signal is as follows: The thickness of the object under test is obtained based on the interval time between adjacent pulses, as shown in the formula, Δt×v=2×l Wherein, Δt represents the interval time between adjacent pulses, v is the propagation speed of ultrasound in the object being detected, and l is the thickness measurement result of the object being detected at the array element.

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