CN111458415B - Method for detecting coupling state of ultrasonic phased array transducer and workpiece to be detected - Google Patents
Method for detecting coupling state of ultrasonic phased array transducer and workpiece to be detected Download PDFInfo
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- CN111458415B CN111458415B CN202010284266.9A CN202010284266A CN111458415B CN 111458415 B CN111458415 B CN 111458415B CN 202010284266 A CN202010284266 A CN 202010284266A CN 111458415 B CN111458415 B CN 111458415B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The embodiment of the invention discloses a method for detecting the coupling state of an ultrasonic phased array transducer and a workpiece to be detected, which comprises the following steps: setting a first focusing rule and a second focusing rule for the ultrasonic phased array transducer, and coupling the fixed surface with a detection surface of a workpiece to be detected; controlling an ultrasonic phased array transducer to emit a first sound beam; controlling an ultrasonic phased array transducer to move along a detection surface of a workpiece to be detected, and obtaining a reflected wave signal with the largest amplitude as a first bottom wave echo signal; and determining the coupling state of the ultrasonic phased array transducer and the workpiece to be measured according to the first bottom wave echo signal and the relation curve of the distance and the amplitude. The detection method disclosed by the embodiment of the invention can provide the standard for evaluating the coupling degree of the ultrasonic phased array transducer and the workpiece to be detected, accurately and objectively detect whether the coupling state meets the requirement or not, and improve the detection effectiveness.
Description
Technical Field
The embodiment of the invention relates to the technical field of ultrasonic phased arrays, in particular to a method for detecting the coupling state of an ultrasonic phased array transducer and a workpiece to be detected.
Background
The ultrasonic phased array is an advanced nondestructive detection means, is generally applied to detection of welding seams, can change the adjustment of angles and ranges of sound beams by setting a focusing rule of the phased array, can detect parameters such as cracks, welding quality and the like in the welding seams under the condition of not damaging the surfaces of workpieces, and is widely applied to various industries.
When the ultrasonic phased array is used for detecting the workpiece, the workpiece is required to be coupled with the wedge block of the ultrasonic phased array transducer, the coupling state between the wedge block and the workpiece has visual influence on the detection effect of the workpiece, the coupling state has a direct relation with the clamping force between the wedge block and the workpiece, whether the couplant is uniformly smeared, the moving speed of the ultrasonic phased array transducer in the scanning process and the like, in the prior art, the coupling position of the workpiece and the wedge block is usually observed by using human eyes, or the clamping force between the wedge block and the workpiece is regulated, or the coupling state between the workpiece and the wedge block is judged by an empirical method such as reducing or increasing the moving speed of the ultrasonic phased array transducer.
The coupling state between the workpiece and the wedge block is judged through an empirical method, the influence of human subjective factors is large, visual and accurate judgment cannot be achieved, errors are often caused, and therefore the detection effect of the ultrasonic phased array technology on the workpiece and the detection accuracy are affected.
Disclosure of Invention
The embodiment of the invention provides a method for detecting the coupling state of an ultrasonic phased array transducer and a workpiece to be detected, which aims to objectively and accurately evaluate the coupling degree between the ultrasonic phased array transducer and the workpiece to be detected and solve the problem that the coupling state between the ultrasonic phased array transducer and the workpiece to be detected is inaccurate in the prior art through a human experience mode.
To achieve the object, the embodiment of the invention provides a method for detecting the coupling state of an ultrasonic phased array transducer and a workpiece to be detected, which comprises the following steps:
setting a first focusing rule and a second focusing rule for the ultrasonic phased array transducer, wherein the first focusing rule is used for controlling the ultrasonic phased array transducer to emit a first sound beam along a first direction, the second focusing rule is used for controlling the ultrasonic phased array transducer to emit a second sound beam along a second direction, the first direction is perpendicular to a fixed surface of the ultrasonic phased array transducer, and the second direction is intersected with the first direction;
coupling the fixed surface with a detection surface of the workpiece to be detected;
controlling the ultrasonic phased array transducer to emit the first sound beam;
controlling the ultrasonic phased array transducer to move along a detection surface of the workpiece to be detected, and obtaining a reflected wave signal with the largest amplitude as a first bottom wave echo signal;
and determining the coupling state of the ultrasonic phased array transducer and the workpiece to be detected according to the first bottom wave echo signal and the relation curve of the distance and the amplitude.
Optionally, before coupling the fixing surface with the detection surface of the workpiece to be detected, the method further includes:
and acquiring a relation curve of the distance and the amplitude.
Optionally, acquiring the distance versus amplitude curve includes:
sequentially coupling the fixed surface with each step surface of the trapezoid test block, controlling the ultrasonic phased array transducer to emit the first sound beam after each coupling, and obtaining a reflected wave signal with the largest amplitude as a first reflected echo signal;
and fitting a relation curve of the distance and the amplitude according to the obtained first reflection echo signals and the corresponding step heights.
Optionally, determining, according to the first bottom wave echo signal and the relation curve of the distance and the amplitude, the coupling state of the ultrasonic phased array transducer and the workpiece to be measured includes:
according to the relation curve of the distance and the amplitude, a first relation curve and a second relation curve are obtained, wherein the relation curve of the distance and the amplitude, the first relation curve and the second relation curve are respectively A, aA and bA, the amplitudes corresponding to the same distance are positive numbers smaller than 1, and a is larger than b;
and comparing the first bottom wave echo signal with the first correlation curve and the second correlation curve, and determining the coupling state of the ultrasonic phased array transducer and the workpiece to be detected according to a comparison result.
Optionally, determining the coupling state of the ultrasonic phased array transducer and the workpiece to be measured according to the comparison result includes:
when the highest amplitude of the first bottom wave echo signal exceeds the first correlation curve, judging that the coupling state is good;
when the highest amplitude of the first bottom wave echo signal is between the first correlation curve and the second correlation curve, judging that the coupling state is general;
and when the highest amplitude of the first bottom wave echo signal is lower than the second correlation curve, judging that the coupling state is poor.
Optionally, in the distance versus amplitude curve, the first correlation curve, and the second correlation curve, the amplitudes corresponding to the same distance are A, aA and bA, respectively, where a=70%.
Optionally, in the distance versus amplitude curve, the first correlation curve, and the second correlation curve, the amplitudes corresponding to the same distance are A, aA and bA, respectively, where b=40%.
Optionally, coupling the fixed surface with the detection surface of the workpiece to be measured includes:
and coupling the fixed surface with the detection surface of the workpiece to be detected by adopting a coupling agent.
The embodiment of the invention discloses a method for detecting the coupling state of an ultrasonic phased array transducer and a workpiece to be detected, which comprises the steps of setting a first focusing rule and a second focusing rule for the ultrasonic phased array transducer, controlling the ultrasonic phased array transducer to emit two beams of sound waves, detecting the coupling degree of the ultrasonic phased array transducer and the workpiece to be detected through the first beam of sound waves, carrying out conventional detection on the workpiece to be detected through the second beam of sound waves, and controlling the ultrasonic phased array transducer to move along a detection surface of the workpiece to be detected, so that the conventional detection on the workpiece is not influenced while the coupling degree of the ultrasonic phased array transducer and the workpiece to be detected is detected, and the working efficiency is improved. The reflection wave signal with the largest amplitude is obtained through the reflection of the first sound beam to serve as a first bottom wave echo signal, the obtaining mode is simple, the operation is convenient, meanwhile, according to the obtained first bottom wave echo signal and the relation curve of the distance and the amplitude, the coupling state of the ultrasonic phased array transducer and the workpiece to be detected is judged, according to the comparison of the first bottom wave echo signal and the relation curve of the distance and the amplitude, whether the coupling degree of the ultrasonic phased array transducer and the workpiece to be detected reaches the standard can be intuitively and accurately judged, the condition that judgment is inaccurate due to the fact that the coupling degree is judged through artificial experience is avoided, and therefore the effectiveness of ultrasonic phased array technology detection is improved.
Drawings
Fig. 1 is a flowchart of a method for detecting a coupling state between an ultrasonic phased array transducer and a workpiece to be detected according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an ultrasonic phased array transducer according to an embodiment of the present invention in a coupled state with a workpiece to be measured.
Fig. 3 is a schematic structural diagram of another coupling state between an ultrasonic phased array transducer and a workpiece to be measured according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a distance versus amplitude relationship according to an embodiment of the present invention.
Fig. 5 is a flowchart of a distance versus amplitude curve acquisition according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a trapezoidal test block according to an embodiment of the present invention.
Fig. 7 is a flowchart of a method for determining a coupling state between an ultrasonic phased array transducer and a workpiece to be measured according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a distance versus amplitude curve, a first correlation curve, and a second correlation curve according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of comparison of a first bottom echo signal and a distance versus amplitude curve according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved by the embodiments of the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below by specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the matters related to the present invention are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts.
The method for detecting the coupling state of the ultrasonic phased array transducer and the workpiece to be detected is suitable for detecting the workpiece with parallel upper and lower surfaces, and is exemplified by pipes, boards and the like. And then coupling the ultrasonic phased array transducer with the surface to be measured of the workpiece to be measured, transmitting an acoustic beam by using the ultrasonic phased array transducer, obtaining a reflected wave signal with the largest amplitude as a first bottom wave echo signal, and finally judging the coupling degree of the ultrasonic phased array transducer and the workpiece to be measured according to the first echo signal and a relation curve of the distance and the amplitude.
Fig. 1 is a flowchart of a method for detecting a coupling state of an ultrasonic phased array transducer and a workpiece to be detected, provided in an embodiment of the present invention, as shown in fig. 1, and the method for detecting a coupling state of an ultrasonic phased array transducer and a workpiece to be detected includes:
s110, setting a first focusing rule and a second focusing rule for the ultrasonic phased array transducer, wherein the first focusing rule is used for controlling the ultrasonic phased array transducer to emit a first sound beam along a first direction, the second focusing rule is used for controlling the ultrasonic phased array transducer to emit a second sound beam along a second direction, the first direction is perpendicular to a fixed surface of the ultrasonic phased array transducer, and the second direction is intersected with the first direction.
The focusing rule refers to a mode of transmitting sound beams by the ultrasonic phased array transducer, sound beam parameters of the ultrasonic phased array transducer are set, the focusing rule of the ultrasonic phased array transducer can be changed, the first focusing rule and the second focusing rule are set, the ultrasonic phased array transducer can be controlled to emit two sound beams, and the incidence angles, the sound beam ranges and the like of the two sound beams can be controlled. The first direction is a direction perpendicular to the coupling surface of the ultrasonic phased array transducer and the workpiece to be measured, and the second direction is a direction which has a certain angle with the coupling surface of the ultrasonic phased array transducer and the workpiece to be measured and intersects with the first sound beam. The ultrasonic phased array transducer is controlled to emit two acoustic beams with different angles by setting the first focusing rule and the second focusing rule, the coupling degree of the ultrasonic phased array transducer and the workpiece to be detected is detected by using the first acoustic beam, the workpiece to be detected is conventionally detected by using the second acoustic beam, the conventional detection of the workpiece to be detected by the ultrasonic phased array transducer is not influenced, the coupling degree between the ultrasonic phased array transducer and the workpiece to be detected can be effectively and objectively reflected in real time, and the accuracy of the ultrasonic phased array transducer in detecting the workpiece to be detected is improved. Fig. 2 is a schematic structural diagram of a coupling state between an ultrasonic phased array transducer and a workpiece to be measured according to an embodiment of the present invention, and as shown in fig. 2, the ultrasonic phased array transducer includes an ultrasonic probe 1 and a wedge 2, where the ultrasonic probe 1 and the wedge 2 may be fixed by bolts. The ultrasonic phased array transducer is utilized to detect weld cracks of the pipe 3, the coupling degree between the ultrasonic phased array transducer and the pipe is intuitively reflected through the first acoustic beam 11, meanwhile, the second acoustic beam 12 is utilized to detect the weld cracks of the pipe 3, on one hand, the coupling degree of the wedge block 2 of the ultrasonic phased array transducer and the pipe 3 can be intuitively detected, whether the coupling degree reaches the standard or not is determined, and on the other hand, an operator can obtain an accurate and effective weld crack detection result on the premise that the coupling degree reaches the standard. Fig. 3 is a schematic structural diagram of another coupling state between an ultrasonic phased array transducer and a workpiece to be tested according to the embodiment of the present invention, as shown in fig. 3, it can be understood that the embodiment of the present invention can also test a workpiece 4 having a stepped shape, and the method is the same as the above method and will not be repeated here.
And S120, coupling the fixed surface with the detection surface of the workpiece to be detected.
The fixed surface is the contact surface of the ultrasonic phased array transducer and the workpiece to be detected, and the fixed surface is coupled with the detection surface of the workpiece to be detected, so that the preparation for detection is made, and the implementation of detection is convenient.
S130, controlling the ultrasonic phased array transducer to emit a first sound beam.
The ultrasonic phased array transducer is controlled to emit a first sound beam, so that the first sound beam irradiates the surface of the ultrasonic phased array transducer, which is coupled with the workpiece to be detected, and the coupling degree is detected. The coupling degree is detected by the sound beam, so that a test result can be effectively obtained in real time, and the detection efficiency is improved.
And S140, controlling the ultrasonic phased array transducer to move along a detection surface of the workpiece to be detected, and obtaining a reflected wave signal with the largest amplitude as a first bottom wave echo signal.
By moving the ultrasonic phased array transducer along the detection surface of the workpiece to be detected, wave signals reflected by the first sound beam are obtained, and it can be understood that the first sound beam comprises a plurality of sound waves.
And S150, determining the coupling state of the ultrasonic phased array transducer and the workpiece to be measured according to the first bottom wave echo signal and the relation curve of the distance and the amplitude.
The relation curve of the distance and the amplitude is a reflection amplitude relation curve with the maximum amplitude of the first sound beam, which is obtained by testing the ultrasonic phased array transducer in reference test blocks with different thicknesses, and the relation of the amplitude of the first bottom wave echo signal and the relation of the distance and the amplitude relation curve after the ultrasonic phased array transducer is coupled with the workpiece to be tested is intuitively and clearly reflected by comparing the first bottom wave echo signal and the relation of the distance and the amplitude relation curve, so that the coupling degree between the ultrasonic phased array transducer and the workpiece to be tested is objectively reflected. And inaccuracy caused by judging the coupling degree of the ultrasonic phased array transducer and the workpiece to be tested by experience is avoided.
Optionally, before coupling the fixing surface with the detection surface of the workpiece to be detected, the method further includes:
and acquiring a relation curve of the distance and the amplitude.
Fig. 4 is a schematic diagram of a relationship between distance and amplitude, as shown in fig. 4, before testing the coupling degree between an ultrasonic phased array transducer and a workpiece to be tested, a relationship curve 10 between distance and amplitude needs to be obtained first, a reference is provided for the coupling degree between the ultrasonic phased array transducer and the workpiece to be tested by obtaining the relationship curve 10 between distance and amplitude, the amplitude of a first bottom wave echo signal in a first sound beam emitted by the ultrasonic phased array transducer is compared with the relationship curve, whether the coupling degree between the ultrasonic phased array transducer and the workpiece to be tested meets the standard is intuitively obtained, and the accuracy of a test result is ensured by objectively measuring the coupling degree.
Fig. 5 is a flowchart of acquiring a distance versus amplitude curve according to an embodiment of the present invention, and as shown in fig. 5, optionally, acquiring a distance versus amplitude curve includes:
and S201, sequentially coupling the fixed surface with each step surface of the trapezoid test block, controlling the ultrasonic phased array transducer to emit a first sound beam after each coupling, and obtaining a reflected wave signal with the largest amplitude as a first reflected echo signal.
The ultrasonic phased array transducer is controlled to emit a first sound beam by coupling the fixed surface with each step surface of the trapezoid test block, the ultrasonic phased array transducer is used for receiving a reflected wave signal reflected by the first sound beam, and the amplitude value data is obtained more intuitively by adopting the maximum amplitude value of the reflected wave signal as a first reflected echo signal, so that the drawing of a relation graph is facilitated, and the efficiency is improved.
S202, fitting a relation curve of distance and amplitude according to the obtained first reflection echo signals and the corresponding step heights.
Fig. 6 is a schematic structural diagram of a trapezoid test block according to an embodiment of the present invention, where, as shown in fig. 6, a trapezoid test block 20 has a plurality of different steps, when an ultrasonic phased array transducer is located at the different steps, the thicknesses corresponding to the first reflected echo signals acquired by the ultrasonic phased array transducer are different, and by acquiring the first reflected echo signals for each step, the data of the reflected echo signal amplitudes corresponding to the different thicknesses are obtained, so that a distance-amplitude relationship curve is conveniently and rapidly obtained, and the working steps are simplified.
Fig. 7 is a flowchart of a method for determining a coupling state between an ultrasonic phased array transducer and a workpiece to be measured according to an embodiment of the present invention, as shown in fig. 7, optionally, for "determining a coupling state between an ultrasonic phased array transducer and a workpiece to be measured according to a first bottom wave echo signal and a relation curve between a distance and an amplitude" further refines, and determining a coupling state between an ultrasonic phased array transducer and a workpiece to be measured according to a first bottom wave echo signal and a relation curve between a distance and an amplitude in S150 includes:
s151, according to the relation curve of the distance and the amplitude, a first relation curve and a second relation curve are obtained, and in the relation curve of the distance and the amplitude, the amplitude corresponding to the same distance is A, aA and bA respectively, a and b are positive numbers smaller than 1, and a is larger than b.
S152, comparing the first bottom wave echo signal with the first correlation curve and the second correlation curve, and determining the coupling state of the ultrasonic phased array transducer and the workpiece to be detected according to the comparison result.
The first correlation curve and the second correlation curve refer to curves obtained by processing the amplitude according to the relation curve of the distance and the amplitude on the premise of ensuring that the trend of the curves is unchanged. Fig. 8 is a schematic diagram of a distance versus amplitude curve, a first correlation curve, and a second correlation curve according to an embodiment of the present invention, where, as shown in fig. 8, if the amplitude in the distance versus amplitude curve 10 is a, the amplitude in the first correlation curve 101 is aA, the amplitude in the second correlation curve 102 is bA, where a and b are positive numbers less than 1, and a > b. By setting the first correlation curve 101 and the second correlation curve 102 to provide reference standards for the first bottom wave echo signals, objective and visual judgment of the coupling state of the ultrasonic phased array transducer and the workpiece to be detected is realized, the working complexity is reduced, and the detection efficiency is improved.
Optionally, determining the coupling state of the ultrasonic phased array transducer and the workpiece to be measured according to the comparison result includes:
when the highest amplitude of the first bottom wave echo signal exceeds the first correlation curve, judging that the coupling state is good;
when the highest amplitude of the first bottom wave echo signal is between the first correlation curve and the second correlation curve, judging that the coupling state is general;
and when the highest amplitude of the first bottom wave echo signal is lower than the second correlation curve, judging that the coupling state is poor.
Fig. 9 is a schematic diagram illustrating comparison of a relationship curve between a distance and an amplitude of a first bottom wave echo signal provided by an embodiment of the present invention, and as shown in fig. 9a, when a highest amplitude of a first bottom wave echo signal 110 exceeds a first relationship curve 101, it is considered that no air medium exists between an ultrasonic phased array transducer and a workpiece to be measured, so that the highest amplitude of the first bottom wave echo signal 110 is larger, and it is determined that the ultrasonic phased array transducer and the workpiece to be measured are tightly attached to each other, and a coupling state is good. In another embodiment, as shown in fig. 9b, when the maximum amplitude of the first bottom wave echo signal 110 is between the first correlation curve 101 and the second correlation curve 102, a small amount of air medium is considered to exist between the ultrasonic phased array transducer and the workpiece to be measured, and the first bottom wave echo signal 110 is slightly affected, it is determined that a gap exists between the ultrasonic phased array transducer and the workpiece to be measured in a mutually attached manner, and the coupling state is general. In another embodiment, as shown in fig. 9c, when the highest amplitude of the first bottom wave echo signal 110 is lower than the second correlation curve 102, it is considered that more air medium exists between the ultrasonic phased array transducer and the workpiece to be measured, so that the highest amplitude of the first bottom wave echo signal 110 is smaller, and then it is determined that the ultrasonic phased array transducer and the workpiece to be measured are mutually attached and loosened, and the coupling state is poor. Through the judgment standard, the judgment standard is objectively provided for the coupling degree of the ultrasonic phased array transducer and the workpiece to be detected, the polarity judgment can be carried out without depending on artificial experience, the factors of artificial subjective judgment are reduced, and the detection accuracy is improved.
Optionally, in the distance versus amplitude curve, the first correlation curve, and the second correlation curve, the amplitudes corresponding to the same distance are A, aA and bA, respectively, where a=70%.
For example, the amplitude corresponding to the same distance in the first correlation curve is selected to be 70% a, and the amplitude corresponding to the same distance in the first correlation curve is set to be 70% a, so that when the highest amplitude of the first bottom wave echo signal is higher than the amplitude of 70% in the relation curve of the distance and the amplitude, the coupling state is considered to be good, a more accurate judgment standard is provided, and the accuracy is improved.
Optionally, in the distance versus amplitude curve, the first correlation curve, and the second correlation curve, the amplitudes corresponding to the same distance are A, aA and bA, respectively, where b=40%.
For example, the amplitude corresponding to the same distance in the second correlation curve is selected to be 40% a, and the amplitude corresponding to the same distance in the second correlation curve is set to be 40% a, so that when the highest amplitude of the first bottom wave echo signal is lower than the amplitude 40% in the relation curve of the distance and the amplitude, the coupling state is considered to be poor, a more accurate judgment standard is provided, and the accuracy is improved.
Optionally, coupling the fixed face with the detection face of the workpiece to be measured includes:
and coupling the fixed surface with the detection surface of the workpiece to be detected by adopting a coupling agent.
The coupling degree between the ultrasonic phased array transducer and the workpiece to be measured can be increased by adopting the coupling agent, and the coupling agent comprises water, glycerol and other substances.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. The method for detecting the coupling state of the ultrasonic phased array transducer and the workpiece to be detected is characterized by comprising the following steps:
setting a first focusing rule and a second focusing rule for the ultrasonic phased array transducer, wherein the first focusing rule is used for controlling the ultrasonic phased array transducer to emit a first sound beam along a first direction, the second focusing rule is used for controlling the ultrasonic phased array transducer to emit a second sound beam along a second direction, the first direction is perpendicular to a fixed surface of the ultrasonic phased array transducer, and the second direction is intersected with the first direction;
coupling the fixed surface with a detection surface of the workpiece to be detected;
controlling the ultrasonic phased array transducer to emit the first sound beam;
controlling the ultrasonic phased array transducer to move along a detection surface of the workpiece to be detected, and obtaining a reflected wave signal with the largest amplitude as a first bottom wave echo signal;
determining the coupling state of the ultrasonic phased array transducer and the workpiece to be detected according to the first bottom wave echo signal and a relation curve of the distance and the amplitude;
before coupling the fixing surface with the detection surface of the workpiece to be detected, the method further comprises:
acquiring a relation curve of the distance and the amplitude;
the relation curve of the acquired distance and the amplitude comprises the following steps:
sequentially coupling the fixed surface with each step surface of the trapezoid test block, controlling the ultrasonic phased array transducer to emit the first sound beam after each coupling, and obtaining a reflected wave signal with the largest amplitude as a first reflected echo signal;
and fitting a relation curve of the distance and the amplitude according to the obtained first reflection echo signals and the corresponding step heights.
2. The method of claim 1, wherein determining the coupling state of the ultrasonic phased array transducer and the workpiece to be measured according to the first bottom wave echo signal and a distance-amplitude relationship curve comprises:
according to the relation curve of the distance and the amplitude, a first relation curve and a second relation curve are obtained, wherein the relation curve of the distance and the amplitude, the first relation curve and the second relation curve are respectively A, aA and bA, the amplitudes corresponding to the same distance are positive numbers smaller than 1, and a is larger than b;
and comparing the first bottom wave echo signal with the first correlation curve and the second correlation curve, and determining the coupling state of the ultrasonic phased array transducer and the workpiece to be detected according to a comparison result.
3. The method according to claim 2, wherein determining the coupling state of the ultrasonic phased array transducer and the workpiece to be detected according to the comparison result comprises:
when the highest amplitude of the first bottom wave echo signal exceeds the first correlation curve, judging that the coupling state is good;
when the highest amplitude of the first bottom wave echo signal is between the first correlation curve and the second correlation curve, judging that the coupling state is general;
and when the highest amplitude of the first bottom wave echo signal is lower than the second correlation curve, judging that the coupling state is poor.
4. The method of claim 2, wherein a = 70%.
5. The method of claim 2, wherein b = 40%.
6. The method of inspection according to claim 1, wherein coupling the stationary surface with the inspection surface of the workpiece to be inspected comprises:
and coupling the fixed surface with the detection surface of the workpiece to be detected by adopting a coupling agent.
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| CN113607812A (en) * | 2021-07-16 | 2021-11-05 | 华北电力科学研究院有限责任公司 | Phased array ultrasonic detection test block structure and detection method for brazing type copper-aluminum transition wire clamp |
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