Solid Coupling Ultrasonic Testing Method

Abstract

The present invention relates to a solid-coupled ultrasonic detection method, belonging to the technical field of ultrasonic detection. In the present invention, two liquid storage containers are used to clamp the object to be detected. Through the elastic coupling layers on the opposite surfaces of the two liquid storage containers and the liquid couplant added into the liquid storage containers, the ultrasonic signal transmission is carried out in a cooperative manner. The ultrasonic probe assembly enters the liquid storage container to scan each area of the object to be detected, collect the reflected ultrasonic signal and the transmitted ultrasonic signal, and perform signal processing. During the whole process, the object to be detected does not contact the liquid couplant, avoiding the pollution of the object to be detected by the liquid couplant, and having wide applicability. Moreover, during ultrasonic scanning, the energy attenuation caused by air or other non-coupling media is also avoided, thereby improving the propagation efficiency and detection sensitivity of ultrasonic waves in the object to be detected, and having a good detection effect.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic testing, and in particular to a solid-coupled ultrasonic testing method. Background Art

[0002] Ultrasonic waves are mechanical waves with a frequency higher than the audible range of humans, usually above 20 kHz. Ultrasonic waves have good penetrability and directivity. When ultrasonic waves encounter the boundary of different media, reflection, refraction, and scattering phenomena will occur. Ultrasonic waves can penetrate objects and reflect when encountering an interface. This characteristic makes ultrasonic waves an ideal detection tool. Ultrasonic Non-Destructive Testing (UT) technology is a widely used detection method for evaluating the properties of materials, detecting internal defects, or measuring thickness without damaging or changing the object being detected.

[0003] Since ultrasonic waves hardly propagate in air, currently, ultrasonic non-destructive testing technology mainly immerses the object to be tested and the ultrasonic probe in a liquid couplant-filled reservoir (i.e., immersion testing) to isolate air, which can avoid the significant impact of the air trapped between the interface of the object to be tested and the ultrasonic probe on ultrasonic scanning imaging.

[0004] Although immersion testing is a commonly used ultrasonic testing method at present, immersion testing has some inherent problems. For example, the liquid couplant may penetrate into the micro-cracks of the object to be tested, causing contamination to the object to be tested; at the same time, immersion testing is not applicable to all types of objects to be tested. For example, for objects to be tested containing electronic components or circuit boards, the liquid couplant may cause short circuits or damage.

[0005] On this basis, in order to avoid contaminating or damaging the object to be tested, it is urgent to develop a solid-coupled ultrasonic testing method. Summary of the Invention

[0006] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology and provides a solid-coupled ultrasonic testing method, thereby solving the problems that the method of ultrasonic testing by placing the object to be tested in a liquid couplant in the prior art can cause contamination to the object to be tested and is not applicable to all types of objects to be tested.

[0007] The technical solution adopted by the present invention is as follows: A solid-coupled ultrasonic testing method, the method comprising the following steps:

[0008] Step a: Attach an elastic coupling layer to the opposite surfaces of two reservoirs respectively, and place the object to be tested between the two reservoirs;

[0009] Step b: Adjust the positions of the liquid reservoirs so that the two liquid reservoirs are close to each other and clamp the object to be measured. Through the elastic coupling layer located between the liquid reservoir and the object to be measured, close contact is achieved between the surface of the object to be measured and the liquid reservoir, and air is excluded to optimize ultrasonic coupling.

[0010] Step c: Add a liquid coupling agent to the two liquid reservoirs to ensure that the liquid level is higher than the uppermost end of the object to be measured.

[0011] Step d: Configure a pair of ultrasonic probe assemblies arranged oppositely. At least one ultrasonic probe assembly emits ultrasonic signal pulses and collects reflected ultrasonic signals, and the other ultrasonic probe assembly receives transmitted ultrasonic signals.

[0012] Step e: Move the ultrasonic probe assemblies to comprehensively scan each area of the object to be measured, collect reflected ultrasonic signals and transmitted ultrasonic signals, and perform signal processing to achieve ultrasonic detection of the object to be measured.

[0013] In one embodiment, in the initial state of step a, the object to be measured can initially be attached to any one of the elastic coupling layers, or the object to be measured can be vertically fixed and at a certain distance from the elastic coupling layers on both sides.

[0014] Preferably, the object to be measured is vertically fixed and at a certain distance from the elastic coupling layer.

[0015] In one embodiment, in step b, before the at least one liquid reservoir reaches the initial position, comes into contact with the surface of the object to be measured, or when it comes into contact with the surface of the object to be measured, the included angle θ formed between the surface facing the object to be measured and the surface of the object to be measured satisfies θ≥0° and θ<90°; either one of the liquid reservoirs can be inclined at an included angle, or both liquid injectors can be inclined at an included angle.

[0016] Preferably, both liquid reservoirs are inclined at an included angle. There is an included angle between the surfaces of the two liquid reservoirs facing the object to be measured and the surface of the object to be measured. Subsequently, during the clamping process, the included angle slowly tends to 0°, which is more conducive to discharging the air between the surface of the object to be measured and the elastic coupling layer to achieve a better ultrasonic detection effect.

[0017] Preferably, the range of the included angle θ is from 2° to 60°.

[0018] More preferably, the range of the included angle θ is from 2° to 30°.

[0019] In one embodiment, in step b, after the liquid reservoirs approach each other and come into contact with the surface of the object to be measured, by controlling the rotation of the liquid reservoir forming an included angle with the surface of the object to be measured, the included angle between the surface of the liquid reservoir facing the object to be measured and the surface of the object to be measured is smoothly reduced to 0°.

[0020] Preferably, the rotational operation of the liquid reservoir is as follows: keep one end of the liquid reservoir that forms an angle with the surface of the object to be measured in contact with the object to be measured, and rotate the other end of the liquid reservoir that forms an angle with the surface of the object to be measured gradually closer to the object to be measured until it is in contact with the object to be measured.

[0021] In one embodiment, in step b, after the angle between the surface of the liquid reservoir facing the object to be measured and the surface of the object to be measured is 0°, pressure is applied to cause the elastic coupling layer to deform, achieving complete adhesion to the surface of the object to be measured. When the elastic coupling layer is completely adhered to the surface of the object to be measured, the air between the two is discharged along the adhesion direction.

[0022] Preferably, the process of applying pressure can be to apply pressure to any one of the two liquid reservoirs, or to apply pressure to both liquid reservoirs.

[0023] More preferably, pressure is applied to both liquid reservoirs.

[0024] In one embodiment, in step d, the ultrasonic signal pulse penetrates through the liquid couplant, the liquid reservoir wall, the elastic coupling layer, and the object to be measured in sequence, and then passes through the elastic coupling layer, the liquid reservoir wall, and the liquid couplant on the other side, and is received by the ultrasonic probe assembly on the other side of the object to be measured for the transmitted ultrasonic signal. At the same time, the original ultrasonic probe assembly collects the reflected ultrasonic signal.

[0025] Preferably, one of the two ultrasonic probe assemblies can transmit and receive the reflected signal, and the other does not transmit but only receives the transmitted signal; or both can transmit ultrasonic signal pulses and receive their respective reflected ultrasonic signals, and at the same time receive the transmitted ultrasonic signals of the other.

[0026] Exemplarily, one of the two ultrasonic probe assemblies transmits and receives the reflected signal, and the other does not transmit but only receives the transmitted signal.

[0027] In the present application, the ultrasonic probe assembly includes one or more ultrasonic probes.

[0028] In one embodiment, in step e, the signal processing includes intercepting the reflected ultrasonic signal within the area of the object to be measured from the collected reflected ultrasonic signals. The requirement for intercepting the reflected ultrasonic signal within the area of the object to be measured is that the reflected ultrasonic signal within the area of the object to be measured does not overlap with the reflected ultrasonic signal at the interface between the inner wall of the liquid reservoir and the reflected ultrasonic signal at the contact interface between the outer wall of the liquid reservoir and the elastic coupling layer; wherein, the reflected ultrasonic signal within the area of the object to be measured refers to the reflected ultrasonic signal originating from the contact interface between the object to be measured and the two elastic coupling layers first collected by the ultrasonic probe assembly.

[0029] Further, the reflected ultrasonic signal within the region of the analyte is located between the reflected ultrasonic signal at the contact interface between the outer wall of the reservoir for the (n - 1)-th time and the elastic coupling layer and the reflected ultrasonic signal at the inner wall interface of the reservoir for the n-th time; where n represents any integer ≥ 2.

[0030] Exemplarily, the reflected ultrasonic signal collected for the first time from the contact interfaces between the analyte and the two elastic coupling layers is located between the reflected ultrasonic signal at the contact interface between the outer wall of the first reservoir and the elastic coupling layer and the reflected ultrasonic signal at the inner wall interface of the second reservoir;

[0031] or, the reflected ultrasonic signal collected for the first time from the contact interfaces between the analyte and the two elastic coupling layers is located between the reflected ultrasonic signal at the contact interface between the outer wall of the second reservoir and the elastic coupling layer and the reflected ultrasonic signal at the inner wall interface of the third reservoir;

[0032] or, the reflected ultrasonic signal collected for the first time from the contact interfaces between the analyte and the two elastic coupling layers is located between the reflected ultrasonic signal at the contact interface between the outer wall of the third reservoir and the elastic coupling layer and the reflected ultrasonic signal at the inner wall interface of the fourth reservoir.

[0033] Further, the requirement for intercepting the reflected ultrasonic signal within the region of the analyte satisfies one of the following conditions:

[0034] The reflection time at the contact interfaces between the analyte and the two elastic coupling layers is less than the reflection time at the inner wall interface of the second reservoir;

[0035] The reflection time at the contact interfaces between the analyte and the two elastic coupling layers is greater than the reflection time at the contact interface between the outer wall of the second reservoir and the elastic coupling layer and less than the reflection time at the inner wall interface of the third reservoir;

[0036] The reflection time at the contact interfaces between the analyte and the two elastic coupling layers is greater than the reflection time at the contact interface between the outer wall of the (N - 1)-th reservoir and the elastic coupling layer and less than the reflection time at the inner wall interface of the N-th reservoir, where N represents any integer ≥ 4.

[0037] Further, the requirement for intercepting the reflected ultrasonic signal within the region of the analyte satisfies one of the following conditions:

[0038]

[0039] and

[0040] and where N represents any integer ≥ 4;

[0041] Among them, S1 represents the distance between the transmitting probe that emits ultrasonic signal pulses and the inner wall of the liquid storage container, S2 represents the thickness of the liquid storage container wall, S3 represents the thickness of the elastic coupling layer, S4 represents the thickness of the object to be measured, and V1, V2, V3, and V4 respectively represent the sound velocities of ultrasonic waves in the liquid couplant, the liquid storage container wall, the elastic coupling layer, and the medium of the object to be measured.

[0042] In one embodiment, the object to be measured is a flat part;

[0043] In this application, the flat part includes, but is not limited to, any one of a battery, a wafer, a composite board, a car body panel, an engine hood, a car door, a circuit board, a heat sink, an electronic device housing, an aircraft door, or an aircraft partition.

[0044] Exemplarily, the flat part is the battery to be measured.

[0045] In this application, the liquid couplant includes, but is not limited to, any one of water, glycerol, silicone oil, vegetable oil, or mineral oil.

[0046] Exemplarily, water is selected as the liquid couplant. By utilizing the principle that the attenuation coefficient of ultrasonic waves in the liquid is small, the propagation efficiency and detection sensitivity of ultrasonic waves in the object to be measured are improved.

[0047] The beneficial effects of the present invention are as follows:

[0048] In the solid-coupled ultrasonic detection method provided by the above solution of the present invention, the object to be measured does not contact the liquid couplant, avoiding the contamination of the object to be measured by the liquid couplant, and having wide applicability. Specifically, the solid-coupled ultrasonic detection method provided by the present invention is particularly suitable for objects to be measured that are sensitive to electricity and objects to be measured that are easily corroded by the liquid couplant, and will not cause problems such as short circuits, damage, or corrosion of the object to be measured.

[0049] The present invention also has the following advantages:

[0050] (1) By using the elastic coupling layer and the liquid couplant to act synergistically, the present invention can effectively transmit ultrasonic signal waves, avoiding energy attenuation caused by air or other non-coupling media, thereby improving the propagation efficiency and detection sensitivity of ultrasonic waves in the object to be measured;

[0051] (2) By adjusting the positions of the two liquid storage containers to make the two liquid storage containers approach each other and clamp the object to be measured, the present invention can effectively reduce or eliminate the bubbles that may exist between the contact surfaces of the elastic coupling layer and the object to be measured, reduce the signal attenuation and detection blind area caused by the bubbles, and improve the accuracy of the detection results;

[0052] (3) The entire detection process of the present invention can be completed only by adjusting the position of the liquid reservoir and the distance between the ultrasonic probe assembly and the inner wall of the liquid reservoir, which reduces the operation difficulty and enables technicians to perform ultrasonic detection tasks more efficiently and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0055] Figure 1 It is a schematic structural diagram of two liquid reservoirs and a test object in the initial position in an embodiment of the present invention.

[0056] Figure 2 It is a schematic structural diagram of two liquid reservoirs and a test object when they start to contact in an embodiment of the present invention.

[0057] Figure 3 It is a schematic structural diagram of two liquid reservoirs and a test object when they are completely attached in an embodiment of the present invention.

[0058] Figure 4 It is a schematic structural diagram in the test state in an embodiment of the present invention.

[0059] Figure 5 It is an ultrasonic sectional view of ultrasonic detection in an embodiment of the present invention.

[0060] Figure 6 It is an ultrasonic reflection signal diagram of ultrasonic detection in an embodiment of the present invention.

[0061] Wherein: 1. First liquid reservoir; 2. Second liquid reservoir; 3. First elastic coupling layer; 4. Second elastic coupling layer; 5. Battery under test; 6. First ultrasonic probe assembly; 7. Second ultrasonic probe assembly; 8. Liquid coupling agent. DETAILED DESCRIPTION OF THE INVENTION

[0062] The following will describe the specific embodiments of the present invention with reference to the drawings.

[0063] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0065] In the case of using "including", "having", and "comprising" described herein, unless an explicit limiting term such as "only", "consisting of", etc. is used, another component can also be added. Unless otherwise mentioned, terms in the singular form can include the plural form and should not be construed as having a quantity of one.

[0066] It should be understood that although terms such as "first" and "second" can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present invention, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element.

[0067] In addition, the accompanying drawings are not drawn to a scale of 1:1, and the relative sizes of the various elements are only drawn by way of example in the accompanying drawings and are not necessarily drawn to the actual scale.

[0068] As Figures 1 to 4 , a schematic structural state diagram of two liquid reservoirs of the solid-coupled ultrasonic detection method in an embodiment of the present invention is shown; for ease of description, the accompanying drawings only show the structures related to the embodiments of the present invention.

[0069] In one embodiment, a solid-coupled ultrasonic detection method is provided, and the method includes the following steps:

[0070] Step a: Attach an elastic coupling layer to the opposite surfaces of two liquid reservoirs respectively, and place the object to be measured between the two liquid reservoirs;

[0071] Step b: Adjust the positions of the liquid reservoirs to make the two liquid reservoirs approach each other and clamp the object to be measured, and achieve close contact between the surface of the object to be measured and the liquid reservoirs through the elastic coupling layer located between the liquid reservoirs and the object to be measured and exclude air;

[0072] Step c: Add the liquid couplant 8 into the two reservoirs, ensuring that the liquid level exceeds the uppermost end of the object to be measured;

[0073] Step d: Configure a pair of ultrasonic probe assemblies arranged oppositely, with at least one ultrasonic probe assembly emitting ultrasonic signal pulses and collecting reflected ultrasonic signals, and the other ultrasonic probe assembly receiving transmitted ultrasonic signals;

[0074] Step e: Move the ultrasonic probe assemblies to comprehensively scan each area of the object to be measured, collect reflected ultrasonic signals and transmitted ultrasonic signals, and perform signal processing to achieve ultrasonic detection of the object to be measured.

[0075] In this embodiment, by way of example, the object to be measured is set as the battery 5 to be measured.

[0076] Further, as Figure 1 shown, in step a, the first elastic coupling layer 3 and the second elastic coupling layer 4 are respectively attached to the opposite surfaces of the first reservoir 1 and the second reservoir 2 arranged obliquely, the battery 5 to be measured is placed between the first reservoir 1 and the second reservoir 2 arranged obliquely, and the battery 5 to be measured is fixed in the vertical direction to ensure that the battery 5 to be measured does not slip during the detection process, and both the first elastic coupling layer 3 and the second elastic coupling layer 4 fully cover the detection area of the battery 5 to be measured;

[0077] Specifically, as Figure 1 shown in the orientation, with the vertical plane as the reference plane, the state of the first reservoir 1 arranged obliquely is that the first elastic coupling layer 3 on the first reservoir 1 forms an angle θ of 20° to the left with the vertical plane; the state of the second reservoir 2 arranged obliquely is that the second elastic coupling layer 4 on the second reservoir 2 forms an angle θ of 20° to the right with the vertical plane; the first reservoir 1 and the second reservoir 2 arranged obliquely are respectively located on the left and right sides of the battery 5 to be measured, and there is a horizontal distance between both the first reservoir 1 and the second reservoir 2 and the battery 5 to be measured.

[0078] Further, as Figures 2 to 3 shown, step b includes:

[0079] b1. Keep the position of the battery 5 to be measured unchanged, move the first reservoir 1 horizontally to the right until the bottom edge line of the first elastic coupling layer 3 on the first reservoir 1 contacts the surface of the battery 5 to be measured. At this time, the angle θ formed between the first elastic coupling layer 3 on the first reservoir 1 and the surface of the battery 5 to be measured is 20°; at the same time, move the second reservoir 2 horizontally to the left until the bottom edge line of the second elastic coupling layer 4 on the second reservoir 2 contacts the surface of the battery 5 to be measured. At this time, the angle θ formed between the second elastic coupling layer 4 on the second reservoir 2 and the surface of the battery 5 to be measured is 20°;

[0080] b2. With the lower bottom edge of the first elastic coupling layer 3 on the first liquid reservoir 1 as the axis, rotate the first liquid reservoir 1 clockwise so that the upper top edge of the first elastic coupling layer 3 on the first liquid reservoir 1 gradually approaches the battery 5 to be tested until it is in contact with the battery 5 to be tested, so that the angle θ formed between the first elastic coupling layer 3 on the first liquid reservoir 1 and the surface of the battery 5 to be tested is smoothly reduced from 20° to 0°; at the same time, with the lower bottom edge of the second elastic coupling layer 4 on the second liquid reservoir 2 as the axis, rotate the second liquid reservoir 2 counterclockwise so that the upper top edge of the second elastic coupling layer 4 on the second liquid reservoir 2 gradually approaches the battery 5 to be tested until it is in contact with the battery 5 to be tested, so that the angle θ formed between the second elastic coupling layer 4 on the second liquid reservoir 2 and the surface of the battery 5 to be tested is smoothly reduced from 20° to 0°;

[0081] b3. Apply pressure to the first liquid reservoir 1 and the second liquid reservoir 2 respectively to cause the first elastic coupling layer 3 and the second elastic coupling layer 4 to deform, so as to squeeze out the bubbles between the battery 5 to be tested and the first elastic coupling layer 3 and the second elastic coupling layer 4, and further remove the air to achieve a close fit between the first liquid reservoir 1 and the second liquid reservoir 2 and the surface of the battery to be tested; in step b, the positions of the first liquid reservoir 1 and the second liquid reservoir 2 are adjusted so that the two are close to each other and clamp the battery 5 to be tested, which can effectively reduce or eliminate the bubbles that may exist between the contact surfaces of the elastic coupling layer 1 and the elastic coupling layer 3 and the battery 5 to be tested, reduce the signal attenuation and detection blind area caused by bubbles, and improve the accuracy of the detection results.

[0082] Furthermore, if Figure 4 As shown, in step c, water is added to the two liquid reservoirs to ensure that the liquid level exceeds the uppermost end of the battery 5 to be tested.

[0083] Furthermore, in step d, a pair of first ultrasonic probe assembly 6 and second ultrasonic probe assembly 7 are arranged opposite to each other, the first ultrasonic probe assembly 6 is correspondingly inserted into the first liquid reservoir 1, and the second ultrasonic probe assembly 7 is correspondingly inserted into the second liquid reservoir 2. Figure 4 As shown, the first ultrasonic probe assembly 6 and the second ultrasonic probe assembly 7 are each exemplarily represented by one ultrasonic probe. The number of corresponding ultrasonic probes in the first ultrasonic probe assembly 6 and the second ultrasonic probe assembly 7 can be selected as required, as long as the entire ultrasonic detection can be satisfied.

[0084] Further, in step e, the first ultrasonic probe assembly 6 and the second ultrasonic probe assembly 7 are moved, and the first ultrasonic probe assembly 6 and the second ultrasonic probe assembly 7 are always kept in a relatively arranged state during the movement, and all areas of the battery 5 to be tested are fully scanned, and the distance between the first ultrasonic probe assembly 6 and the inner wall of the first liquid reservoir 1 is changed.

[0085] satisfy

[0086] Among them, S1 represents the distance between the first ultrasonic probe assembly 6 and the inner wall of the first liquid reservoir 1, S2 represents the thickness of the first liquid reservoir wall 1, S3 represents the thickness of the first elastic coupling layer 3, S4 represents the thickness of the battery 5 to be measured, and V1, V2, V3, and V4 respectively represent the sound velocities of ultrasonic waves in water, the first liquid reservoir wall, the first elastic coupling layer 3, and the battery 5 to be measured;

[0087] The ultrasonic signal pulse is emitted through the first ultrasonic probe assembly 6. The ultrasonic signal pulse sequentially penetrates the water in the first liquid reservoir 1, the first liquid reservoir 1 wall, the first elastic coupling layer 3, and the battery 5 to be measured, then passes through the second elastic coupling layer 4, the second liquid reservoir 2 wall, and the water in the second liquid reservoir 2, and finally the transmitted ultrasonic signal is received by the second ultrasonic probe assembly 7. At the same time, the first ultrasonic probe assembly 6 collects the reflected ultrasonic signal, collects the transmitted ultrasonic signal and the reflected ultrasonic signal, intercepts the reflected ultrasonic signal and the transmitted ultrasonic signal within the area of the battery 5 to be measured, and performs signal analysis to realize the ultrasonic detection of the battery 5 to be measured.

[0088] Figure 5 It is an ultrasonic section diagram of ultrasonic detection in an embodiment of the present invention.

[0089] Figure 6 It is an ultrasonic reflection signal diagram of ultrasonic detection in an embodiment of the present invention.

[0090] As Figure 5 shown is an ultrasonic section diagram of ultrasonic detection in the above embodiment. As Figure 6 shown is an ultrasonic reflection signal diagram of ultrasonic detection in the above embodiment. Through as Figures 5 to 6 shown, it can be intuitively seen that by using the solid-coupled ultrasonic detection method of the present invention, the intercepted signal is good, the collected reflected signals are separated and there is no overlap, and the performance of the battery to be measured can be accurately detected.

[0091] The solid-coupled ultrasonic detection method of the present invention clamps the battery under test 5 by bringing the first liquid reservoir 1 and the second liquid reservoir 2 with elastic coupling layers attached to two opposite surfaces closer to each other, and eliminates the air bubbles between the contact surfaces of the elastic coupling layer and the battery under test 5. Compared with the immersion detection, the object under test does not contact the liquid couplant 8 during the detection process of the present invention, avoiding the contamination of the object under test by the liquid couplant 8, and having wide applicability. Specifically, the solid-coupled ultrasonic detection method provided by the present invention is particularly suitable for objects under test that are electrically sensitive and objects under test that are vulnerable to corrosion by the liquid couplant 8, and will not cause problems such as short circuit, damage or corrosion of the object under test; at the same time, the present invention utilizes the synergistic effect of the elastic coupling layer and the liquid couplant 8 to effectively transmit ultrasonic signals, avoiding energy attenuation caused by air or other non-coupling media, thereby improving the propagation efficiency and detection sensitivity of ultrasonic waves in the object under test; in addition, during the entire detection process of the present invention, the operation difficulty is low, and it can be completed only by simply adjusting the position of the liquid reservoir and the distance between the ultrasonic probe assembly and the inner wall of the liquid reservoir. Technicians can perform the detection task more efficiently and accurately.

[0092] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0093] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A solid coupled ultrasonic detection method, characterized in that: The method comprises the following steps: Step a: attaching elastic coupling layers to opposite surfaces of two liquid reservoirs respectively, and placing the object to be tested between the two liquid reservoirs; Step b: adjusting the positions of the liquid reservoirs so that the two liquid reservoirs are close to each other and clamp the object to be tested, and achieving close contact between the surface of the object to be tested and the liquid reservoirs and exhausting air through the elastic coupling layer located between the liquid reservoirs and the object to be tested; By applying pressure, the elastic coupling layer is deformed to achieve complete fit with the surface of the object to be tested; Step c: Add liquid coupling agent to the two reservoirs, ensuring that the liquid level exceeds the uppermost end of the object to be tested; Step d: configuring a pair of ultrasonic probe assemblies arranged opposite to each other, wherein the pair of ultrasonic probe assemblies extend into two liquid reservoirs respectively, at least one ultrasonic probe assembly transmits ultrasonic signal pulses and collects reflected ultrasonic signals, and the other ultrasonic probe assembly receives transmitted ultrasonic signals; Step e: Move the ultrasonic probe assembly to comprehensively scan all areas of the object to be tested, collect reflected ultrasonic signals and transmitted ultrasonic signals, and perform signal processing to achieve ultrasonic testing of the object to be tested.

2. The solid coupled ultrasonic detection method according to claim 1, characterized in that: In step b, at least one liquid reservoir, when in the initial position, before contacting the surface of the object to be measured or when in contact with the surface of the object to be measured, has an angle θ≥0° and θ<90° formed between its surface facing the object to be measured and the surface of the object to be measured.

3. The solid coupled ultrasonic detection method according to claim 2, characterized in that: In step b, when the liquid reservoirs are brought close to each other until they are in contact with the surface of the object to be tested, the angle between the surface of the liquid reservoir facing the object to be tested and the surface of the object to be tested is smoothly reduced to 0° by controlling the rotation of the liquid reservoir forming an angle with the surface of the object to be tested.

4. The solid coupled ultrasonic detection method according to claim 3, characterized in that: In step b, when the angle between the surface of the liquid reservoir facing the object to be tested and the surface of the object to be tested is 0°, pressure is applied to cause the elastic coupling layer to deform so as to achieve complete contact with the surface of the object to be tested.

5. The solid coupled ultrasonic detection method according to claim 1, characterized in that: The ultrasonic signal pulse sequentially penetrates the liquid coupling agent, the liquid reservoir wall, the elastic coupling layer and the test piece, and then passes through the elastic coupling layer, the liquid reservoir wall and the liquid coupling agent on the other side. The ultrasonic probe assembly on the other side of the test piece receives the transmitted ultrasonic signal, while the original ultrasonic probe assembly collects the reflected ultrasonic signal.

6. The solid coupled ultrasonic detection method according to claim 5, characterized in that: In the step e, the signal processing includes intercepting the reflected ultrasonic signal in the area of ​​the object to be measured from the collected reflected ultrasonic signal, and the interception of the reflected ultrasonic signal in the area of ​​the object to be measured requires that the reflected ultrasonic signal in the area of ​​the object to be measured does not overlap with the reflected ultrasonic signal at the interface of the inner wall of the liquid reservoir and the reflected ultrasonic signal at the contact interface between the outer wall of the liquid reservoir and the elastic coupling layer; wherein the reflected ultrasonic signal in the area of ​​the object to be measured refers to the reflected ultrasonic signal originating from the contact interface between the object to be measured and the two elastic coupling layers, which is collected for the first time by the ultrasonic probe assembly.

7. The solid coupled ultrasonic detection method according to claim 6, characterized in that: The reflected ultrasonic signal in the area of ​​the object to be tested is located between the reflected ultrasonic signal at the contact interface between the outer wall of the n-1th liquid reservoir and the elastic coupling layer and the reflected ultrasonic signal at the contact interface between the inner wall of the nth liquid reservoir; wherein n represents any integer ≥2.

8. The solid coupled ultrasonic detection method according to claim 6 or 7, characterized in that: The interception of the reflected ultrasonic signal in the area of ​​the object to be tested requires satisfying one of the following conditions: The reflection time of the contact interface between the object to be tested and the two elastic coupling layers is shorter than the reflection time of the second liquid reservoir inner wall interface; The reflection time of the contact interface between the object to be tested and the two elastic coupling layers is greater than the reflection time of the second contact interface between the outer wall of the liquid reservoir and the elastic coupling layer and is less than the reflection time of the third contact interface between the inner wall of the liquid reservoir; The reflection time of the contact interface between the object to be tested and the two elastic coupling layers is greater than the reflection time of the contact interface between the outer wall of the liquid reservoir and the elastic coupling layer for the N-1th time and less than the reflection time of the inner wall of the liquid reservoir for the Nth time, wherein N represents any integer ≥4.

9. The solid coupled ultrasonic detection method according to claim 6 or 7, characterized in that: The interception of the reflected ultrasonic signal in the area of ​​the object to be tested requires satisfying one of the following conditions: Wherein, N represents any integer ≥ 4; Wherein, S1 represents the distance between the transmitting probe emitting the ultrasonic signal pulse and the inner wall of the reservoir, S2 represents the thickness of the reservoir wall, S3 represents the thickness of the elastic coupling layer, S4 represents the thickness of the object to be measured, and V1, V2, V3 and V4 represent the sound speed of ultrasonic waves in the liquid coupling agent, the reservoir wall, the elastic coupling layer and the medium of the object to be measured, respectively.

10. The solid coupled ultrasonic detection method according to claim 1, characterized in that: The object to be tested is a flat plate part.

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