Skin interlayer internal corrosion detection device and method

Abstract

The invention discloses a skin interlayer internal corrosion detection device and method. The skin interlayer internal corrosion detection device comprises a transverse wave type electromagnetic ultrasonic probe, a duplexer, a transmitting signal amplifier, a receiving signal amplifier, an upper computer and a display device. The transverse wave type electromagnetic ultrasonic probe comprises a shell, a first magnet, a second magnet and a coil, the first magnet and the second magnet are both installed in the shell, and the first magnet is located between the coil and the second magnet; the contact surfaces of the first magnet and the second magnet are opposite in magnetism; the coil is installed on the housing and is opposite to a position to be detected. The coil is connected with the duplexer, and the transmitting signal amplifier and the receiving signal amplifier are both connected with the duplexer. The transmitting signal amplifier and the receiving signal amplifier are both connected with the upper computer. The display device is used for being connected with an upper computer so as to display defect depth information measured by the transverse wave type electromagnetic ultrasonic probe. The skin interlayer internal corrosion detection device provided by the invention realizes defect depth measurement.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic detection, and in particular to a device and method for detecting internal corrosion of a skin interlayer. Background Art

[0002] As an important covering layer on the surface of mechanical equipment, the skin can improve the strength, stability and durability of the equipment. For example, the wing structure of an aircraft usually uses aluminum alloy machined panels as the skin to increase its strength and stability. During the service of the aircraft, due to environmental corrosion and load, the inner metal matrix of the aircraft skin is prone to corrosion damage, which seriously affects the function and economic repair of the aircraft structure, and even affects its service life. However, this damage is highly concealed and difficult to detect and discover, and its harm is often ignored.

[0003] However, it is difficult to effectively inspect parts with complex shapes, and there are many influencing factors, making positioning and quantification difficult, which makes it difficult to measure the corrosion depth inside the skin interlayer.

[0004] Therefore, how to achieve defect depth measurement is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for detecting internal corrosion of a skin interlayer, so as to achieve defect depth measurement.

[0006] The skin interlayer internal corrosion detection device provided in the present application comprises:

[0007] A transverse wave electromagnetic ultrasound probe, comprising a shell, a first magnet, a second magnet and a coil, wherein the first magnet and the second magnet are both installed in the shell, and the first magnet is located between the coil and the second magnet; the contact surfaces of the first magnet and the second magnet have opposite magnetic properties; the coil is installed in the shell and faces the position to be measured;

[0008] A duplexer, the coil being connected to the duplexer;

[0009] A transmitting signal amplifier, the transmitting signal amplifier is connected to the duplexer;

[0010] A receiving signal amplifier, the receiving signal amplifier is connected to the duplexer;

[0011] A host computer, the transmitting signal amplifier and the receiving signal amplifier are both connected to the host computer, and the host computer calculates the defect depth information measured by the shear wave electromagnetic ultrasonic probe;

[0012] A display device is used to connect to the host computer to display the defect depth information measured by the shear wave electromagnetic ultrasonic probe.

[0013] Optionally, the above-mentioned skin interlayer internal corrosion detection device also includes a platform scanning device, the shear wave electromagnetic ultrasonic probe is installed on the platform scanning device, the platform scanning device drives the shear wave electromagnetic ultrasonic probe to move along the surface of the skin to be tested, the platform scanning device is connected to the host computer, and the display device receives the host computer command to display the position information measured by the shear wave electromagnetic ultrasonic probe.

[0014] Optionally, in the above-mentioned skin interlayer internal corrosion detection device, the platform scanning device includes:

[0015] A mechanical claw, the mechanical claw is used to clamp the shear wave electromagnetic ultrasound probe;

[0016] A lateral moving device, the lateral moving device is used to drive the mechanical claw to move lateraly;

[0017] A longitudinal moving device, the longitudinal moving device is used to drive the mechanical claw to move longitudinally, and is arranged vertically in the horizontal and vertical directions;

[0018] A control device, wherein the control device controls the operation of the mechanical claw, the lateral moving device and the longitudinal moving device, and the control device is connected to the host computer.

[0019] Optionally, in the above-mentioned skin sandwich internal corrosion detection device:

[0020] The lateral movement device comprises a frame, a beam and a lateral driving device, the frame is connected to the beam in a lateral sliding manner, the lateral driving device controls the frame to slide in a lateral manner, and the mechanical claw is installed on the frame;

[0021] The longitudinal moving device comprises a longitudinal driving device and two supporting frames. The two supporting frames are slidably connected to the opposite ends of the crossbeam respectively. The longitudinal driving device controls the crossbeam to slide in the longitudinal direction.

[0022] Optionally, in the above-mentioned skin sandwich internal corrosion detection device, the mechanical claw includes:

[0023] A gripping clamp, wherein two gripping clamps are provided, and the two gripping clamps are used to clamp the shear wave electromagnetic ultrasound probe;

[0024] A support block, the middle portion of the gripper is hinged to the support block, and the support block is relatively fixed to the frame;

[0025] A slider, wherein the grabbing clamp is hinged to the slider through a connecting rod, and the connecting rod is hinged to the grabbing clamp to drive the two grabbing clamps to clamp or release;

[0026] Lead screw;

[0027] A first drive motor drives the lead screw to rotate, the lead screw is threadedly connected to the frame, and the first drive motor is installed on the frame; the slider is installed at one end of the lead screw axially away from the first drive motor and moves along the axial direction of the lead screw, with the longitudinal direction being the axial direction of the lead screw.

[0028] Optionally, in the above-mentioned skin interlayer internal corrosion detection device, the first magnet is a cylindrical magnet, the top magnetic pole of the first magnet is an N pole, and the bottom magnetic pole of the first magnet is an S pole;

[0029] The second magnet is a cylindrical magnet, the top magnetic pole of the second magnet is an N pole, and the bottom magnetic pole of the second magnet is an S pole;

[0030] The first magnet is located directly below the second magnet, and the coil is located directly below the first magnet.

[0031] Optionally, in the above-mentioned skin interlayer internal corrosion detection device, the shear wave electromagnetic ultrasonic probe also includes a connector, the connector is connected to the coil through a wire, and the connector is embedded in the shell.

[0032] A method for detecting internal corrosion of a skin interlayer is implemented by using any of the above-mentioned devices for detecting internal corrosion of a skin interlayer, comprising the steps of:

[0033] S1, the transverse wave electromagnetic ultrasonic probe is located at the position of the skin to be tested, and the host computer sends a pulse signal to the transmitting signal amplifier;

[0034] S2, the transmitting signal amplifier performs signal amplification processing on the pulse signal, and the transmitting signal amplifier transmits the amplified pulse signal to the duplexer;

[0035] S3, the duplexer passes the amplified pulse signal of the transmitting signal amplifier into the coil, and at the same time, the contact surface between the skin to be tested and the coil generates ultrasonic waves, which are received by the coil;

[0036] S4, the coil transmits the received ultrasonic signal to the host computer through the duplexer and the receiving signal amplifier in sequence;

[0037] S5. Calculate the defect depth of the skin according to the ultrasonic signal received by the host computer.

[0038] Optionally, in the above-mentioned method for detecting internal corrosion of the skin interlayer, the step S5 comprises: according to the ultrasonic signal received by the host computer, a formula for obtaining the defect depth d of the skin to be tested is:

[0039] d=(x2-x1) / (1000(2v / fs))

[0040] Among them, x2 is the horizontal coordinate of the peak value of the ultrasonic secondary echo, x1 is the horizontal coordinate of the peak value of the ultrasonic primary echo, v is the propagation speed of the ultrasonic wave in the skin, and fs is the sampling rate of the corrosion detection device inside the skin interlayer.

[0041] Optionally, in the above-mentioned skin interlayer internal corrosion detection method, the following steps are also included:

[0042] S6, the platform scanning device carries the shear wave electromagnetic ultrasonic probe to perform scanning, and obtains the defect position information of the skin to be tested according to the scanning result, the shear wave electromagnetic ultrasonic probe is installed on the platform scanning device, the platform scanning device drives the shear wave electromagnetic ultrasonic probe to move along the surface of the skin to be tested, the platform scanning device is connected to the display device, and the display device displays the position information measured by the shear wave electromagnetic ultrasonic probe; wherein the defect position information of the skin to be tested is obtained according to the ultrasonic signal received by the host computer, including:

[0043] Perform envelope drawing according to the ultrasonic signal received by the host computer to extract extreme value points;

[0044] According to the first three echoes of the ultrasonic signal received by the host computer, an integral calculation is performed to obtain the energy of the signal, and the energy value is used to assist in the determination of the defect depth;

[0045] Based on a series of signals obtained by scanning the platform scanning device, a distribution map of internal corrosion defects in the skin interlayer to be tested is obtained.

[0046] In the above technical scheme, the skin interlayer internal corrosion detection device provided by the present invention includes a shear wave electromagnetic ultrasonic probe, a duplexer, a transmitting signal amplifier, a receiving signal amplifier, a host computer and a display device. The shear wave electromagnetic ultrasonic probe includes a shell, a first magnet, a second magnet and a coil, the first magnet and the second magnet are both installed in the shell, and the first magnet is located between the coil and the second magnet; the contact surfaces of the first magnet and the second magnet have opposite magnetic properties; the coil is installed in the shell and is directly opposite to the position to be measured. The coil is connected to the duplexer, and the transmitting signal amplifier and the receiving signal amplifier are both connected to the duplexer. The transmitting signal amplifier and the receiving signal amplifier are both connected to the host computer, and the host computer calculates the defect depth information measured by the shear wave electromagnetic ultrasonic probe. The display device is used to connect to the host computer to display the defect depth information measured by the shear wave electromagnetic ultrasonic probe.

[0047] From the above description, it can be seen that in the skin interlayer internal corrosion detection device provided in the present application, the defect depth of the skin measured by the shear wave electromagnetic ultrasonic probe is displayed on a display through the cooperation of the shear wave electromagnetic ultrasonic probe, the duplexer, the transmitting signal amplifier, the receiving signal amplifier, and the host computer, thereby realizing the defect depth measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0049] Figure 1 A schematic diagram of the structure of a shear wave electromagnetic ultrasonic probe provided by an embodiment of the present invention;

[0050] Figure 2 A schematic diagram of the structure of a platform scanning device provided in an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of an ultrasonic signal provided by an embodiment of the present invention.

[0052] in Figure 1-2 middle:

[0053] 1-platform scanning device, 101-support block, 102-grip, 103-slider, 104-screw, 105-skeleton, 106-first drive motor, 107-crossbeam, 108-support frame;

[0054] 2- transverse wave electromagnetic ultrasound probe, 201- first magnet, 202- second magnet, 203- connector, 204- housing, 205- coil. DETAILED DESCRIPTION

[0055] The core of the present invention is to provide a device and method for detecting internal corrosion of a skin interlayer to achieve defect depth measurement.

[0056] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0057] Please refer to Figures 1 to 3 .

[0058] In a specific embodiment, the skin interlayer internal corrosion detection device provided by the specific embodiment of the present invention includes a shear wave electromagnetic ultrasonic probe 2, a duplexer, a transmitting signal amplifier, a receiving signal amplifier, a host computer and a display device. The skin used for detection can be an aircraft skin, and the skin can specifically be a metal plate.

[0059] like Figure 1 As shown, the transverse wave electromagnetic ultrasound probe 2 includes a housing 204, a first magnet 201, a second magnet 202 and a coil 205. The first magnet 201 and the second magnet 202 are both installed in the housing 204. The first magnet 201 is located between the coil 205 and the second magnet 202. The coil 205 is connected to a duplexer. Specifically, the duplexer and the coil 205 can be connected via a flexible cable. The contact surfaces of the first magnet 201 and the second magnet 202 have opposite magnetic properties, and the coil 205 is located below the first magnet 201. The shapes of the first magnet 201 and the second magnet 202 can be the same or different. The first magnet 201 is a cylindrical magnet, and the second magnet 202 is a cylindrical magnet. The axis extension lines of the two cylindrical magnets coincide.

[0060] In the transverse wave electromagnetic ultrasound probe 2 provided in the present application, the first magnet 201 is located directly below the second magnet 202, and the coil 205 is located directly below the first magnet 201. Figure 1 As shown, the exciting and receiving coil 205 is located at the bottom of the first magnet 201, which has a relatively high vertical bias magnetic field. For electromagnetic ultrasonic testing, the magnetic field strength used to excite the ultrasonic wave affects the intensity of the ultrasonic wave and also affects the energy of the signal. Therefore, the coil 205 is arranged at this position. This setting is easy to generate ultrasonic shear waves in the skin to be tested, and has the advantages of high conversion efficiency and low power consumption.

[0061] In a specific embodiment, the first magnet 201 and the second magnet 202 are made of the same material. For example, the first magnet 201 and the second magnet 202 are made of NdFeB. Of course, the materials of the first magnet 201 and the second magnet 202 are not limited to the above.

[0062] The coil 205 is mounted on the housing 204 and faces the position to be measured. The upper surface of the first magnet 201 overlaps with the lower surface of the second magnet 202. For example, the top magnetic pole of the first magnet 201 is the N pole, the bottom magnetic pole of the first magnet 201 is the S pole, the top magnetic pole of the second magnet 202 is the N pole, and the bottom magnetic pole of the second magnet 202 is the S pole.

[0063] In a specific embodiment, the shear wave electromagnetic ultrasound probe 2 further includes a connector 203, which is connected to the coil 205 through a wire, and the connector 203 is embedded in the housing 204 to prevent foreign matter from contacting the connector 203. The connector 203 can be a LEMO 0B two-core connector, and the connector 203 is arranged above the first magnet 201 and the second magnet 202. A hole for accommodating the connector 203 is provided on the outer wall of the housing 204. The connector 203 is used to transmit signals and fix cables. The connector 203 is used to connect to a duplexer. Specifically, the duplexer is plugged into the connector 203 through a plug with a wire. Such a configuration facilitates the plugging of the duplexer and the shear wave electromagnetic ultrasound probe 2.

[0064] In order to facilitate the fixing of the coil 205, preferably, a groove for accommodating the coil 205 is provided at the bottom of the housing 204, and the coil 205 is connected to the connector 203 through a wire provided on the side wall. Such a setting reduces interference to the signal and facilitates wiring.

[0065] When performing skin inspection, the skin is placed under the shear wave electromagnetic ultrasonic probe 2, and the distance between the surface of the component to be tested and the coil 205 is less than 2 mm. For example, the distance between the surface of the component to be tested and the coil 205 is less than 1.5 mm-1.0 mm. In order to improve the detection accuracy, when performing skin inspection, the coil 205 is placed on the skin to be tested, and the surface of the aircraft skin to be tested is in contact with the coil 205.

[0066] The transmitting signal amplifier and the receiving signal amplifier are both connected to the duplexer. The transmitting signal amplifier and the receiving signal amplifier are both connected to the host computer.

[0067] The display device is used to connect to the host computer to display the defect depth information measured by the shear wave electromagnetic ultrasonic probe 2. Specifically, the display can be a computer display. Specifically, the detection signal and result can be wirelessly transmitted to the computer through the WiFi module on the host computer and viewed on the computer.

[0068] In order to improve the insulation performance and high temperature tolerance of the coil 205 so that it can withstand higher voltage and current, the coil 205 is preferably made of enameled copper wire, and the diameter of the enameled copper wire can be 0.2 mm. Of course, in specific use, it is not limited to the above specifications.

[0069] Preferably, the material of the skin to be tested may be aluminum alloy.

[0070] During the inspection, the transverse wave electromagnetic ultrasonic probe 2 is located at the position of the skin to be inspected, and the host computer sends a pulse signal to the transmitting signal amplifier. The transmitting signal amplifier amplifies the pulse signal, and the transmitting signal amplifier transmits the amplified pulse signal to the duplexer. The duplexer passes the amplified pulse signal of the transmitting signal amplifier into the coil 205. At the same time, the contact surface between the skin to be inspected and the coil 205 generates an ultrasonic wave, which is received by the coil 205. The coil 205 transmits the received ultrasonic wave signal to the host computer through the duplexer and the receiving signal amplifier in sequence. According to the ultrasonic signal received by the host computer, the defect depth of the skin is calculated.

[0071] Among them, according to the ultrasonic signal received by the host computer, the formula for obtaining the defect depth d of the skin to be tested is:

[0072] d=(x2-x1) / (1000(2v / fs))

[0073] Among them, x2 is the horizontal coordinate of the peak value of the ultrasonic secondary echo, x1 is the horizontal coordinate of the peak value of the ultrasonic primary echo, v is the propagation speed of the ultrasonic wave in the skin, and fs is the sampling rate of the corrosion detection device inside the skin interlayer.

[0074] It can be seen from the above description that in the skin interlayer internal corrosion detection device provided in the specific embodiment of the present application, the defect depth of the skin measured by the shear wave electromagnetic ultrasonic probe 2 is displayed on the display through the cooperation of the shear wave electromagnetic ultrasonic probe 2, the duplexer, the transmitting signal amplifier, the receiving signal amplifier, and the host computer, thereby realizing the defect depth measurement.

[0075] In a specific embodiment, the skin interlayer internal corrosion detection device also includes a platform scanning device 1, a shear wave electromagnetic ultrasonic probe 2 is installed on the platform scanning device 1, the platform scanning device 1 drives the shear wave electromagnetic ultrasonic probe 2 to move along the surface of the skin to be tested, the platform scanning device 1 is connected to the host computer, and the display device receives the host computer command to display the position information measured by the shear wave electromagnetic ultrasonic probe 2.

[0076] In a specific embodiment, the platform scanning device 1 includes a mechanical claw, a lateral moving device, a longitudinal moving device and a control device, and the control device controls the mechanical claw, the lateral moving device and the longitudinal moving device to work. Specifically, the control device can be an embedded microcomputer, and the control device is connected to a host computer to transmit the position information of the platform scanning device 1 to the host computer.

[0077] The mechanical claw is used to clamp the transverse wave electromagnetic ultrasonic probe 2, and the transverse moving device is used to drive the mechanical claw to move transversely. The longitudinal moving device is used to drive the mechanical claw to move longitudinally, and the transverse and longitudinal directions are arranged vertically.

[0078] In a specific embodiment, the lateral movement device includes a frame 105, a crossbeam 107 and a lateral drive device, the frame 105 is connected to the crossbeam 107 by sliding in the lateral direction, the lateral drive device controls the frame 105 to slide in the lateral direction, and the mechanical claw is installed on the frame 105. Specifically, the lateral drive device can be a telescopic member or a motor drive device, for example, the lateral drive device drives the frame 105 to move by extending and retracting the telescopic rod, or the motor drive drives the frame 105 to move by a linear motor.

[0079] The longitudinal moving device includes a longitudinal driving device and two support frames 108. The two support frames 108 are respectively slidably connected to the opposite ends of the beam 107. The longitudinal driving device controls the longitudinal sliding of the beam 107. Specifically, the longitudinal driving device can be a telescopic member or a motor driving device. For example, the longitudinal driving device drives the beam 107 to move by telescoping the telescopic rod, or the motor driving device drives the beam 107 to move by a linear motor.

[0080] In order to realize the mechanical claw clamping the shear wave electromagnetic ultrasound probe 2, the mechanical claw includes a gripper 102, a support block 101, a slider 103, a lead screw 104 and a first drive motor 106 that drives the lead screw 104 to rotate. Two grippers 102 are provided, and the two grippers 102 are used to clamp the shear wave electromagnetic ultrasound probe 2. The middle part of the gripper 102 is hinged to the support block 101, and the support block 101 is relatively fixed to the frame 105.

[0081] The gripper 102 is hinged to the slider 103 through a connecting rod, and the connecting rod is hinged to the gripper 102 to drive the two grippers 102 to clamp or loosen. The lead screw 104 is threadedly connected to the frame 105, the first drive motor 106 is installed on the frame 105, and the slider 103 is installed at one end of the lead screw 104 axially away from the first drive motor 106, and the longitudinal direction is the axial direction of the lead screw 104. Specifically, the first drive motor 106 drives the lead screw 104 to rotate in the forward and reverse directions, thereby driving the frame 105 to move along the axial direction of the lead screw 104, and the lifting of the frame 105 drives the hinged gripper 102 to rotate through the connecting rod, so as to realize the opening and closing of the mechanical claw.

[0082] The control device realizes the opening and closing of the mechanical claws, the lateral sliding of the skeleton 105 on the crossbeam 107, and the longitudinal sliding of the crossbeam 107 on the fixed support frame 108; the control device has displacement feedback function, arbitrary position stop and return function, and automatic return to the scanning origin function. The control device inputs the size and position coordinates of the metal plate to be tested in the program and automatically completes the scanning action. The entire scanning process is: after arrival, the x-axis moves from one end of the tested skin to the other end, and after the scanning is completed, the shear wave electromagnetic ultrasonic probe 2 is moved in the y-axis direction by a distance of the detection range size, and the scanning continues along the x-axis until the entire surface of the tested skin is scanned.

[0083] The shear wave signal in the ultrasonic wave collected by the shear wave electromagnetic ultrasonic probe 2 is processed by the host computer to obtain the precise depth information of the internal corrosion defect of the aircraft skin interlayer, and the location information of the defect is obtained by scanning and combining the ultrasonic morphology map of the internal corrosion defect of the aircraft skin interlayer.

[0084] During specific use, the platform scanning device 1 is equipped with a transverse wave electromagnetic ultrasonic probe 2 for scanning. According to the scanning results, the defect position information of the skin to be tested is obtained. The transverse wave electromagnetic ultrasonic probe 2 is installed on the platform scanning device 1. The platform scanning device 1 drives the transverse wave electromagnetic ultrasonic probe 2 to move along the surface of the skin to be tested. The platform scanning device 1 is connected to the host computer, and the display device receives the host computer command to display the position information measured by the transverse wave electromagnetic ultrasonic probe 2. The defect position information of the skin to be tested is obtained according to the ultrasonic signal received by the host computer, including: envelope drawing according to the ultrasonic signal received by the host computer, and extracting extreme points. According to the first three echoes of the ultrasonic signal received by the host computer, an integral calculation is performed to obtain the energy of the signal, and the energy value is used to assist in the depth judgment of the defect. According to a series of signals obtained by the platform scanning device 1, a distribution map of the internal corrosion defects of the interlayer of the skin to be tested is obtained.

[0085] The aircraft skin interlayer internal corrosion defect detection algorithm based on electromagnetic ultrasonic shear waves of the present invention is a special algorithm. According to the propagation characteristics of electromagnetic ultrasound in skin materials, such as aluminum alloys, accurate depth information of the internal corrosion defects of the interlayer of the component to be tested can be directly obtained on the display through bandpass filtering denoising, envelope extraction, extreme value extraction, and formula calculation. The location information of the defect can be obtained by scanning and combining with the ultrasonic morphology map of the internal corrosion defects of the aircraft skin interlayer.

[0086] The present application provides a method for detecting internal corrosion of a skin interlayer, which is implemented by any of the above-mentioned internal corrosion detection devices for a skin interlayer, and comprises the following steps:

[0087] S1, the transverse wave electromagnetic ultrasonic probe 2 is located at the position of the skin to be tested, and the upper computer sends a pulse signal to the transmitting signal amplifier. Specifically, the skin is placed under the transverse wave electromagnetic ultrasonic probe 2, and the distance between the surface of the component to be tested and the coil 205 is less than 2mm. For example, the distance between the surface of the component to be tested and the coil 205 is less than 1.5mm-1.0mm. In order to improve the detection accuracy, when performing skin detection, the coil 205 is placed on the skin to be tested, and the surface of the aircraft skin to be tested is in contact with the coil 205.

[0088] S2. The transmitting signal amplifier amplifies the pulse signal, and transmits the amplified pulse signal to the duplexer.

[0089] S3, the duplexer transmits the amplified pulse signal of the transmitting signal amplifier to the coil 205, and at the same time, the contact surface between the skin to be tested and the coil 205 generates ultrasonic waves, which are received by the coil 205.

[0090] S4, the coil 205 transmits the received ultrasonic signal to the host computer through the duplexer and the receiving signal amplifier in sequence.

[0091] S5. Calculate the defect depth of the skin according to the ultrasonic signal received by the host computer.

[0092] Specifically, step S5 includes: according to the ultrasonic signal received by the host computer, the formula for obtaining the defect depth d of the skin to be tested is:

[0093] d=(x2-x1) / (1000(2v / fs))

[0094] Among them, x2 is the horizontal coordinate of the peak value of the ultrasonic secondary echo, x1 is the horizontal coordinate of the peak value of the ultrasonic primary echo, v is the propagation speed of the ultrasonic wave in the skin, and fs is the sampling rate of the corrosion detection device inside the skin interlayer.

[0095] In a specific embodiment, the skin interlayer internal corrosion detection method further comprises the steps of:

[0096] S6, the platform scanning device 1 is equipped with a shear wave electromagnetic ultrasonic probe 2 for scanning, and the defect position information of the skin to be tested is obtained according to the scanning result. The shear wave electromagnetic ultrasonic probe 2 is installed on the platform scanning device 1, and the platform scanning device 1 drives the shear wave electromagnetic ultrasonic probe 2 to move along the surface of the skin to be tested. The platform scanning device 1 is connected to the display device, and the display device displays the position information measured by the shear wave electromagnetic ultrasonic probe 2; wherein the defect position information of the skin to be tested obtained according to the ultrasonic signal received by the host computer includes:

[0097] Draw the envelope based on the ultrasonic signal received by the host computer and extract the extreme points;

[0098] Based on the first three echoes of the ultrasonic signal received by the host computer, an integral calculation is performed to obtain the energy of the signal, and the energy value is used to assist in the determination of the defect depth;

[0099] The internal corrosion defect distribution diagram of the skin interlayer to be tested is obtained according to a series of signals obtained by the platform scanning device 1. The series of signals refers to the ultrasonic signals obtained by the platform scanning device 1 during the entire working process.

[0100] The above is a detailed introduction to the skin interlayer internal corrosion detection device and method provided in the embodiments of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0101] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be subject to that defined in the attached claims.

[0102] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0103] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0104] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A device for detecting internal corrosion of a skin interlayer, characterized in that: include: A transverse wave electromagnetic ultrasonic probe (2), the transverse wave electromagnetic ultrasonic probe (2) comprising a shell (204), a first magnet (201), a second magnet (202) and a coil (205), the first magnet (201) and the second magnet (202) both being mounted in the shell (204), the first magnet (201) being located between the coil (205) and the second magnet (202); the contact surfaces of the first magnet (201) and the second magnet (202) having opposite magnetic properties; the coil (205) being mounted in the shell (204) and facing the position of the skin to be measured; A duplexer, the coil (205) being connected to the duplexer; A transmitting signal amplifier, the transmitting signal amplifier is connected to the duplexer; A receiving signal amplifier, the receiving signal amplifier is connected to the duplexer; A host computer, the transmitting signal amplifier and the receiving signal amplifier are both connected to the host computer, and the host computer calculates the defect depth information measured by the shear wave electromagnetic ultrasonic probe (2); A display device, wherein the display device is used to be connected to the host computer to display the defect depth information measured by the shear wave electromagnetic ultrasonic probe (2).

2. The skin interlayer internal corrosion detection device according to claim 1 is characterized in that: The device also comprises a platform scanning device (1), the transverse wave electromagnetic ultrasonic probe (2) is installed on the platform scanning device (1), the platform scanning device (1) drives the transverse wave electromagnetic ultrasonic probe (2) to move along the surface of the skin to be measured, the platform scanning device (1) is connected to the host computer, and the display device receives instructions from the host computer to display the position information measured by the transverse wave electromagnetic ultrasonic probe (2).

3. The device for detecting internal corrosion of the skin interlayer according to claim 2, characterized in that: The platform scanning device (1) comprises: A mechanical claw, the mechanical claw being used to clamp the shear wave electromagnetic ultrasound probe (2); A lateral moving device, the lateral moving device is used to drive the mechanical claw to move lateraly; A longitudinal moving device, the longitudinal moving device is used to drive the mechanical claw to move longitudinally, and is arranged vertically in the horizontal and vertical directions; A control device, wherein the control device controls the operation of the mechanical claw, the lateral moving device and the longitudinal moving device, and the control device is connected to the host computer.

4. The skin interlayer internal corrosion detection device according to claim 3 is characterized in that: The lateral movement device comprises a frame (105), a crossbeam (107) and a lateral drive device, the frame (105) is connected to the crossbeam (107) in a lateral sliding manner, the lateral drive device controls the frame (105) to slide in a lateral manner, and the mechanical claw is installed on the frame (105); The longitudinal moving device comprises a longitudinal driving device and two supporting frames (108), wherein the two supporting frames (108) are respectively slidably connected to opposite ends of the crossbeam (107), and the longitudinal driving device controls the crossbeam (107) to slide longitudinally.

5. The device for detecting internal corrosion of the skin interlayer according to claim 4, characterized in that: The mechanical claw comprises: A gripping clamp (102), wherein two gripping clamps (102) are provided, and the two gripping clamps (102) are used to clamp the shear wave electromagnetic ultrasound probe (2); A support block (101), the middle portion of the gripper (102) is hinged to the support block (101), and the support block (101) and the frame (105) are relatively fixed; A slider (103), wherein the gripping clamp (102) is hingedly connected to the slider (103) via a connecting rod, and the connecting rod is hingedly connected to the gripping clamp (102) to drive the two gripping clamps (102) to clamp or release; Lead screw (104); A first drive motor (106) drives the lead screw (104) to rotate, the lead screw (104) is threadedly connected to the frame (105), and the first drive motor (106) is installed on the frame (105); the slider (103) is installed on one end of the lead screw (104) axially away from the first drive motor (106), and moves axially along the lead screw (104), with the longitudinal direction being the axial direction of the lead screw (104).

6. The device for detecting internal corrosion of the skin interlayer according to claim 1, characterized in that: The first magnet (201) is a cylindrical magnet, the top magnetic pole of the first magnet (201) is an N pole, and the bottom magnetic pole of the first magnet (201) is an S pole; The second magnet (202) is a cylindrical magnet, the top magnetic pole of the second magnet (202) is an N pole, and the bottom magnetic pole of the second magnet (202) is an S pole; The first magnet (201) is located directly below the second magnet (202), and the coil (205) is located directly below the first magnet (201).

7. The device for detecting internal corrosion of the skin interlayer according to any one of claims 1 to 6, characterized in that: The transverse wave electromagnetic ultrasound probe (2) further comprises a connector (203), wherein the connector (203) is connected to the coil (205) via a wire, and the connector (203) is embedded in the housing (204).

8. A method for detecting internal corrosion of a skin interlayer, characterized in that: The method is realized by the skin interlayer internal corrosion detection device according to any one of claims 1 to 7, comprising the steps of: S1, a transverse wave electromagnetic ultrasonic probe (2) is located at the position of the skin to be detected, and a pulse signal is sent by the host computer to the transmitting signal amplifier; S2, the transmitting signal amplifier performs signal amplification processing on the pulse signal, and the transmitting signal amplifier transmits the amplified pulse signal to the duplexer; S3, the duplexer passes the amplified pulse signal of the transmission signal amplifier into the coil (205), and at the same time, the contact surface between the skin to be tested and the coil (205) generates ultrasonic waves, which are received by the coil (205); S4, the coil (205) transmits the received ultrasonic signal to the host computer through the duplexer and the receiving signal amplifier in sequence; S5. Calculate the defect depth of the skin according to the ultrasonic signal received by the host computer.

9. The method for detecting internal corrosion of the skin interlayer according to claim 8, characterized in that: The step S5 comprises: according to the ultrasonic signal received by the host computer, the formula for obtaining the defect depth d of the skin to be tested is: d=(x2-x1) / (1000(2v / fs)) Among them, x2 is the horizontal coordinate of the peak value of the ultrasonic secondary echo, x1 is the horizontal coordinate of the peak value of the ultrasonic primary echo, v is the propagation speed of the ultrasonic wave in the skin, and fs is the sampling rate of the corrosion detection device inside the skin interlayer.

10. The method for detecting internal corrosion of the skin interlayer according to claim 8, characterized in that: Also includes the steps: S6, the platform scanning device (1) carries the transverse wave electromagnetic ultrasonic probe (2) to perform scanning, and obtains defect position information of the skin to be tested based on the scanning result, the transverse wave electromagnetic ultrasonic probe (2) is installed on the platform scanning device (1), the platform scanning device (1) drives the transverse wave electromagnetic ultrasonic probe (2) to move along the surface of the skin to be tested, the platform scanning device (1) is connected to the display device, and the display device displays the defect position information of the skin to be tested obtained according to the ultrasonic signal received by the host computer; wherein the defect position information of the skin to be tested obtained according to the ultrasonic signal received by the host computer includes: Perform envelope drawing according to the ultrasonic signal received by the host computer to extract extreme value points; According to the first three echoes of the ultrasonic signal received by the host computer, an integral calculation is performed to obtain the energy of the signal, and the energy value is used to assist in the determination of the defect depth; Based on a series of signals obtained by scanning with the platform scanning device (1), a distribution diagram of corrosion defects inside the skin interlayer to be tested is obtained.

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