KR101704577B1 - Beam Focusing Method Of Nondestructive Evaluation - Google Patents

Abstract

The present invention relates to a beam focusing method for a nondestructive inspection which has excellent performance of detecting cracks on a surface, and excellent sensitivity. According to the embodiment of the present invention, the beam focusing method for the nondestructive inspection comprises: a step of obtaining a roof element plane using a position coordinate of elements of a probe including a receiving unit and a transmitting unit including a plurality of elements transmitting or receiving waves; a step of determining a normal vector of the roof element plane; a step of determining an incident plane including the normal vector; a step of calculating an incident beam vector on a wedge satisfying an obtained view angle; and a step of calculating a refracted beam vector on a test piece based on the incident beam vector.

Description

[0001] The present invention relates to a beam focusing method for non-destructive inspection,

The present invention relates to a beam focusing method of a nondestructive inspection.

In ultrasound testing, a very short ultrasonic pulsewave with a center frequency typically ranging from 0.1 to 15 MHz, and sometimes up to 50 MHz, is used to detect internal defects or characterize the material Lt; / RTI > This technique is also often used to determine the thickness of the object to be inspected, for example, to inspect and monitor the interior of the object without destroying the object, such as pipe wall corrosion.

Ultrasonic inspection is often performed on steel and other metals and alloys, but may be used for concrete, wood and composites, albeit with lower resolution. It is a form of nondestructive inspection used in many industries.

Two basic methods for receiving ultrasonic waveforms are pulse-echo and pitch-catch. In the pulse-echo mode, since the sound is reflected back to the device, the transducer performs both transmission and reception of the pulse wave. The reflected ultrasonic waves come from the same interface as the back wall of the object or from defects inside the object. The diagnostic machine typically displays these results in the form of a signal having a time of arrival of reflection indicative of amplitude and distance representative of the intensity of the reflection. In the Pitch-Catch mode, individual transducers are used to transmit and receive ultrasonic waves.

There are a number of advantages of ultrasound testing. This inspection method provides a high penetrating power, which enables the detection of deep defects in the part being analyzed. It is also a type of highly sensitive test that allows the detection of extremely small defects. In general, only one surface should be accessible for ultrasound examination. This method provides better accuracy than other non-destructive methods in determining the depth of internal defects and the thickness of the parts with parallel surfaces. This provides some ability to estimate the size, orientation, shape, and characteristics of the defect. This is generally harmless to operation or nearby personnel and has no effect on nearby equipment and materials.

It is also portable and highly automated.

One type of ultrasound is known as phased array ultrasound. For this type of inspection, the probe consists of a plurality of elements (in an array of elements), each of which can independently transmit and / or receive ultrasonic waves. By combining the transmitted waves from each individual element, a composite sound beam is generated. This beam can be steered and / or focused in an arbitrary manner by applying a short time delay across the elements and then firing the elements together. In a similar manner, a receive array may be implemented with a particular angle and / or focal depth by applying a series of short delays across the elements and then summing the contributions from all the elements. And may be set to be sensitive to the ultrasonic waves coming from.

Korean Patent Publication No. 10-2012-0117207

An object of the present invention is to provide a non-destructive inspection beam focusing method having excellent surface cracking capability and excellent sensitivity.

The present invention can also provide a method of calculating the focusing of a beam traveling on three dimensions by placing a loop angle on the probe.

In addition, the present invention can propose an algorithm that reduces the amount of computation when determining the autofocusing depth.

A beam focusing method of a nondestructive inspection according to an embodiment of the present invention is a method of focusing a beam on a loop element plane (or an object) by using position coordinates of the elements of a probe including a transmitter and a receiver having a plurality of elements for transmitting or receiving ultrasonic waves Roof Element plane); Determining a normal vector of the loop element plane; Determining an incident plane comprising the normal vector; Obtaining an incident beam vector on a wedge satisfying a given view angle; And obtaining a refracted beam vector on the test piece based on the incident beam vector.

Also, the beam focusing method of the nondestructive inspection according to another embodiment of the present invention determines X and Y axis field coordinate values from the coordinate values of the refraction beam vector having the Z axis field coordinate values of the Z axis coordinate values of a given focusing depth The method of claim 1, further comprising the step of:

According to another aspect of the present invention, there is provided a beam focusing method for a non-destructive inspection, comprising the steps of: moving the incident beam vector along a Z-axis coordinate value of the incident beam vector to 0, Obtaining a value; And determining a focusing depth based on the coordinate value at that time until the Y-axis coordinate value of the refraction beam vector becomes 0 along the refraction beam vector. A focusing method may be provided.

According to still another aspect of the present invention, there is provided a beam focusing method for a non-destructive inspection, comprising the steps of: determining an incident point satisfying a shortest time to a field coordinate based on a position of each of the elements; May be provided.

The method may further include obtaining a loop element plane using the position coordinates of the elements of the probe in the beam focusing method of the nondestructive inspection method according to another embodiment of the present invention when the roof angle of the probe is 0 degrees Obtaining a non-Roof Element plane using position coordinates of the elements of the non-Roof element; And determining the loop element plane by rotating the non-loop element plane by a predetermined loop angle to provide a non-destructive inspection beam focusing method.

In another aspect of the present invention, there is provided a beam focusing method of a non-destructive inspection method, wherein the non-loop element plane is determined using center coordinates of at least three elements It is possible.

The beam focusing method of the nondestructive inspection according to another embodiment of the present invention may also provide a beam focusing method of the nondestructive inspection, wherein the three elements are the first element, the last element and the center element on the probe .

According to another aspect of the present invention, there is provided a beam focusing method for a non-destructive inspection, comprising the steps of: vertically intersecting an axis vector passing through a center point between the first element and the last element, And a loop rotation vector passing through coordinates of a dividing point, which is a boundary point between the transmitting unit and the receiving unit, is obtained.

According to another aspect of the present invention, there is provided a beam focusing method for a nondestructive inspection method, wherein a division point of a probe having the predetermined loop angle is determined by rotating the loop rotation vector by the predetermined loop angle, A beam focusing method of a non-destructive inspection can be provided.

According to another aspect of the present invention, there is provided a beam focusing method for a non-destructive inspection, wherein the loop element plane is determined based on a center point of the first element, a center point of the last element, A beam focusing method may be provided.

According to another aspect of the present invention, there is provided a beam focusing method for a nondestructive inspection, the method comprising the steps of: providing a wedge between an incidence plane and a refraction plane including the refraction beam vector, Determining a propagation time of the beam from the arbitrary element to the field coordinate based on the common straight line of the field coordinate system.

In the embodiment of the present invention, by setting the loop angle of the probe, it is possible to remove the surface non-detection area caused by the dead zone generated in the probe having no loop angle, thereby to detect the surface cracks well.

In addition, embodiments of the present invention can provide a non-destructive inspection beam focusing method having excellent sensitivity, i.e., excellent autofocusing capability.

In addition, the embodiment of the present invention can provide an algorithm that greatly reduces the amount of computation for obtaining the autofocusing depth.

1 is a flow chart of a method of driving a non-chaotic wave test apparatus according to an embodiment of the present invention.
2 is a detailed flowchart of the loop focusing calculation step.
3 is a detailed flowchart of a step of obtaining an element plane.
4 is a detailed flowchart of a step of obtaining an incident point of an element.
5 is a cross-sectional view of the wedge and probe located on the test piece.
6 is a view of a probe having no wedge and loop located in a test piece.
7 shows a probe with a loop.
8 shows vectors on an element plane and an incident plane;
9 is a view showing an incidence plane and a refraction plane.

Hereinafter, a beam focusing method of a nondestructive inspection according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

1 is a flowchart of a method of driving a non-chaotic wave inspection apparatus according to an embodiment of the present invention. 2 is a detailed flowchart of the loop focusing calculation step, FIG. 3 is a detailed flowchart of a step of obtaining an element plane, and FIG. 4 is a detailed flowchart of a step of obtaining an incident point of an element. 6 is a view showing a probe having no wedge and a loop positioned on a test piece, Fig. 7 is a view showing a probe having a loop, Fig. 8 is a view showing a probe having a loop, And vectors on an incident plane, and Fig. 9 is a diagram showing an incident plane and a refraction plane.

In describing the present invention, focusing means that an ultrasonic beam is directed toward a point of interest of a test specimen so as to concentrate acoustic energy by an ultrasonic beam toward a point of interest on the specimen.

Referring to the drawings, a nondestructive inspection apparatus according to an embodiment of the present invention includes a wedge 200 having a wedge angle from the X-axis on a plane formed by an X-axis and a Z-axis, 200 and a loop angle from the Y-axis on a plane formed by the Y-axis (Scan dxis) and the Z-axis, and an ultrasound generating and receiving ultrasound information from the probe (100) And a control and processing unit 400 for controlling the beam forking.

The driving method of the nondestructive inspection apparatus according to the embodiment of the present invention may include a dimension recognizing step S100, a non-roof focusing calculating step S200, and a loop focusing calculating step S300 have.

The dimension recognizing step S100 is a step of determining whether or not the Y-axis of the probe 100 is in accordance with the shape of the probe 100. [ Here, the shape of the probe 100 is a case in which the roof angle is formed by the roof shape depending on the position of the elements in the probe, or when the roof angle is 0 degree by not having the roof shape.

The probe 100 includes a transmitter 110 having a plurality of arrayed elements for transmitting ultrasound waves and a receiver 110 having a plurality of arrayed elements for receiving reflected ultrasound waves in the test specimen : 120).

The probe 100 including the transmitting unit 110 and the receiving unit 120 may be disposed on a wedge 200 having a predetermined wedge angle. The transmitting unit 110 and the receiving unit 120 of the probe 100 may have a roof angle so as to have a roof shape.

When the probe 100 has no loop shape according to the probe geometry, that is, when the loop angle is 0 degree, the beam focusing from the probe 100 is determined on the two-dimensional plane by the X and Z axes, Beam focusing from the probe 100 can be determined in the three-dimensional space by the X, Y, and Z axes when the loop 100 has a loop shape, i.e., when the loop angle is not 0 degrees.

When the Y axis does not exist, the beam focusing of the probe 100 can be calculated on the two-dimensional coordinate, and when the Y axis exists, the beam focusing of the probe 100 can be calculated on the three-dimensional coordinate.

The presence or absence of the Y axis of the probe 100 depends on whether the angle of the roof of the probe 100 is zero or not and when the angle of the loop is not 0, , And when the angle of the loop is 0, the Y axis of the probe 100 may not be considered in the focusing calculation.

The heights of the wedge 200 on the X axis from the one end to the other end are different from each other according to the wedge angle, and the heights of the Y and the Y of the transmitter 110 and the receiver 120 The height along the axis is different in the Z axis. The transmitting unit 110 and the receiving unit 120 form the same plane when the loop angle is 0. When the loop angle is not 0, the transmitting unit 110 and the receiving unit 120 form a roof as a whole.

If there is no loop of the probe 100 on the basis of the dimension recognition step S100, it is determined as a focus point (Focus, X, Z) according to the steering angle given in the non-loop focusing calculation step S200 The incident point of the beam from the refracted central element C is determined, and the coordinates (Focus X, Z) of the focal point are determined according to the determination of the incident point. Then, the shortest distance equation of the Fermat's refraction principle in each element can be obtained by the dichotomy algorithm, and the incident point for each element can be obtained. Also, given the view angle, the angle of incidence of the beam from the center element C can be obtained by the formula sin (incident angle) = sin (steering angle) * (velocity on the wedge / velocity of the beam on the specimen) have. The method of finding the shortest distance equation of the Fermat's law by the dichotomy algorithm (the method of finding the root by repeating the selection of the lower lung section where the root is present after dividing the lung section where the root exists) And the detailed description thereof will be omitted.

Meanwhile, the control and processing unit 400 in the dimension recognizing step S100 may recognize whether or not the loop of the probe 100 exists in accordance with the loop angle value input from the user to the control and processing unit 400. [ When the loop angle is manually or automatically adjusted and the adjusted loop angle is not 0 degree, the control and processing unit 400 in the dimension recognizing step S100 determines whether the loop of the probe 100 exists The loop angle of the probe 100 may be recognized by reading the loop angle stored in the control and processing unit 400 in advance.

If there is a loop of the probe based on the dimension recognition step (SlOO), focusing coordinates in three dimensions are calculated in the loop focusing calculation step (S300).

The loop focusing calculation step S300 includes an element plane determination step S310, an incident plane determination step S320, an incident beam vector and a refraction beam vector determination step S330, an auto focus Z coordinate calculation step S340, Step S350, an element incidence point determination step S360, a two-dimensional X, Y coordinate calculation step S370, and a 3D beam focusing step S380.

The non-loop element plane may mean a plane including any point of each of the elements of the transmission unit 110 or the reception unit 120 with the loop angle of the probe 100 being 0 degrees, May refer to a plane including an arbitrary point of each of the elements of the transmitter 110 or the receiver 120 when the loop angle of the transmitter 100 is not 0 degrees.

The loop element plane determination step S310 includes a non-roof element position coordinate determination step S311, a non-loop element plane determination step S312, and a loop element plane determination step S313 using a loop rotation vector. . ≪ / RTI >

First, in step S320, a Roof Element plane is obtained by using the positional coordinates of the Element before obtaining an incident plane that is a plane through which the beam passes. That is, since the progress of the beam is performed on the incident plane having the normal vector of the plane of the loop element, the element position coordinate is obtained first, the loop element plane including the element position is obtained (S310) The incident plane can be obtained (S320).

In the non-loop element position coordinate determination step S311, the position coordinate value of the elements in the loop free state of the probe 100 is determined. The value of the position coordinate (1) of the first element 110F, the value of the position coordinate (2) of the last element 110L and the position coordinate (C) of the center element 110C are determined and the first element 110F Which is perpendicular to the straight line passing through the position coordinate 1 of the last element 110L and the position coordinate 2 of the last element 110L and on the straight line passing through the position coordinate C of the center element 110C, (3) of the dividing point corresponding to the boundary point of the boundary points of the two points. Thus, the coordinates (1) of the first element 110F, the coordinates (2) of the last element 110L, and the coordinates (3) of the division point can be determined. The non-loop element plane without loop state is determined based on the coordinate values of the three points ((1), (2), and (C)) determined as described above in the non-loop element plane determination step S312 . Loop element plane in the loop element plane determining step S313 using the loop rotation vector determined by the position coordinate C of the center element 110C and the coordinates 3 of the dividing point is determined as the position of the center element 110C The loop element plane can be obtained by rotating about the coordinate (C) by the roof angle.

That is, the non-loop element plane in the case where there is no loop is obtained and then rotated by the loop angle based on the coordinates of the center element.

More specifically, since the non-loop element plane equations are obtained given three points (1, 2, C) of the non-loop element plane, the three points (1, 2, C) (1) of the first element 110F of the receiving unit 120, the coordinates (2) of the last element 110L, and the coordinates (C) of the center element 110C, The coordinates of the three points (1, 2, and C) in the loop-free state can be determined, and the coordinates of these three points (1, 2, and C) can be determined To obtain the non-loop element plane.

Referring to Equation 1 below, A, B, and C in the plane equation are normal vectors for the plane, D is the length of the normal, and the coordinates (X, Y, Z) are defined as one point of the plane .

[ Equation 1 ]

(A, B, and C) are obtained by finding A, B, C, and D in the plane equation Ax + By + Cz + D = 0, and the equation of the non-loop element plane constitutes the first element 110F Perpendicular to the axis vector passing through the coordinate (1) of the last element (110) and the coordinate (2) of the last element (110L).

Planes are defined at least three points and planes are defined as (X1, Y1, Z1), (X2, Y2, Z2) and (X3, Y3, Z3), which are coordinates of three points (1, 2, The values of A, B, C, and D are determined.

It is also possible to obtain the position of the 3 'point by rotating the third point of the non-loop element plane by the loop angle and obtain the position of the non-loop element plane by using the first point, the second point and the third point, By solving the equations of the element plane, we can obtain the loop element plane in the state where the loop exists.

In this case, the 3 'point rotated by the loop angle can be obtained by rotating a Roof rotation vector obtained by connecting three points at the center point in the axis vector, and the vector rotation of the Axis can be obtained by rotating a predetermined It can be obtained using the Rodrigues' rotation formula, which is an algorithm for rotating the vector at an angle. The Rodriguez rotation formula is obvious to a person skilled in the art and a detailed description thereof will be omitted.

The Y-axis of the 3 'point is half of the center separation defined as the distance between the center points of the transmitting and receiving units 110 and 120, respectively. And the X, Y coordinate values of the elements on the non-loop element plane are the same as the X, Y coordinate values of the elements on the loop element plane. This is because the non-loop element plane is rotated based on the coordinate (C) of the center element 110C on the axis vector to obtain the loop-element plane.

On the other hand, the accuracy of the loop element plane can be verified by calculating the angle between the non-loop element plane and the loop element plane to calculate whether the angle of the loop is the loop angle.

Also, when the user inputs a loop angle to the control and processing unit 400, or when the loop element plane is obtained from the non-loop element plane, such as when using the loop angle previously stored in the control and processing unit 400, Since the Z value is negative with respect to the Z axis, the loop angle can be set to a negative value.

The coordinate values of the elements necessary for obtaining the plane may be input to the control and processing unit 400 by the user or may be a value that the control and processing unit 400 stores in advance.

An incidence plane perpendicular to the loop element plane can be obtained from the loop element plane in the incidence plane determining step S320.

Since the plane of incidence is perpendicular to the plane of the loop element, it can be obtained by the cross product of the axis vector and the plane of the loop element.

On the other hand, when calculating the outer product of the axis vector and the loop element plane, the value may be negative and the beam proceeds in the direction of increasing the Z coordinate value, so that the Z coordinate of the normal vector of the incident plane is negative , Each of the X, Y, and Z coordinate values of the normal vector is multiplied by -1.

In the incident beam vector and refraction beam vector determination step S330, the incident beam-vector (i-vector) from the element to the incident point on the incident plane and the refracted beam-vector (t-vector) Can be determined by calculation based on the refractive equation and the bisect method algorithm.

Also, the ultrasonic beam emitted from the element proceeds on the incident plane when the Z coordinate value is negative, and proceeds on the refracted plane when the Z coordinate value is positive.

Also, when calculating the view angle, it is possible to obtain only the X and Y coordinate values without considering the Y coordinate value. This is because the display of the S MODE becomes two-dimensional on the X-axis and the Z-axis even when a loop exists. Therefore, in order to obtain an incident beam vector (i-vector), the X-coordinate of the incident plane is obtained using a dichotomy algorithm such that the incident angle becomes a view angle when only the X-coordinate of the center element C is considered , And the Y coordinate of the incident plane can be obtained as a value when Z = 0 in the incident plane.

The auto focus Z coordinate calculation step S340 proceeds from the coordinates of the center element to the incident beam-vector (i-vector) until the Z axis coordinate value becomes 0. When the Z coordinate value becomes 0, the X, The Y coordinate value is obtained, and then the Y coordinate value of the refraction beam-vector (t-vector) is progressed from the (X, Y, 0) coordinate until the Y coordinate value becomes 0, The Z-coordinate (= field Z) of the auto focusing depth can be obtained from the auto focusing depth.

The embodiment of the present invention can physically determine the focusing according to the steering angle given by the roof angle. However, the present invention is not limited to this, and the focusing depth can be manually changed. When the focusing depth Z is manually given, the X and Y coordinates of the point having the field Z coordinate can be determined as the field X and the field Y, and the focusing depth Z (field Z As the coordinate values are changed, the X, Y coordinates on the refraction beam vector having the changed field Z coordinates are determined as the new field X and field Y, and the field X, Y, Z coordinates satisfying the given focusing depth Z are determined .

In order to calculate the focusing information of each of the elements other than the center element 110C in the focus information determination step S350, the shortest time to the coordinates (field X, field Y, field Z) The focal point information can be obtained.

The step of determining the incidence point of the element (S360) may include a step (S361) of calculating the time to the field position per element position, and a step (S362) of calculating the incidence point satisfying the shortest time.

Assuming that the plane equation of the incident plane is Ax + By + Cz + D = 0 and the equation of the plane of the refracted plane is A2x + B2y + C2z + D2 = 0, the refraction occurs at Z = 0, Each of the above plane equations at position satisfies Ax + By + D = 0, A2x + B2y + D2 = 0. And the two equations satisfy the relation A1 / B1 = A2 / B2 because they are the same straight line at the position where the refraction occurs.

[ Equation 2 ]

Referring to Equation (2), the movement time of the beam from the position coordinates (ex, ey, ez) of each element to the field position coordinates (field X, field Y, field Z)

[ Equation 3 ]

In Equation (3), V1 is the velocity of the beam at the wedge, V2 is the velocity of the beam at the specimen, and X, Y are the incident positions.

Here, since Z is 0, only the X, Y coordinate values can be obtained.

[ Equation 4 ]

Also, referring to Equation (4), if t is differentiated with respect to X, the term in which Y exists is differentiated with respect to Y, and then multiplied by dy / dx. Since dt / dx is obtained, the X and Y coordinate values can be obtained by performing this segmentation algorithm using this equation.

In the three-dimensional beam focusing step (S380), the loop of the loop element plane may have a predetermined angle so that beam focusing can be performed well.

The embodiments of the present invention described above can be implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer-readable recording medium may be those specifically designed and configured for the present invention or may be those known and used by those skilled in the computer software arts. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROM and DVD, magneto-optical media such as floptical disks, medium, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code, such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be modified into one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: Probe
110:
120: Receiver
200: Wedge
300: test piece
400: Control and Processing Unit

Claims (11)

Obtaining a Roof Element plane using position coordinates of the elements of a probe including a transmitter and a receiver having a plurality of elements for transmitting or receiving ultrasonic waves;
Determining a normal vector of the loop element plane;
Determining an incident plane comprising the normal vector;
Obtaining an incident beam vector on a wedge satisfying a given view angle;
Obtaining a refracted beam vector on the test specimen based on the incident beam vector;
Determining X and Y-axis field coordinate values from the coordinate values of the refraction beam vector having Z-axis field coordinate values that are Z-axis coordinate values of a given focusing depth; And
And determining an incidence point that satisfies the shortest time to the field coordinate based on the position of each of the elements,
Wherein the step of obtaining the loop element plane using the position coordinates of the elements of the probe comprises:
Obtaining a non-Roof Element plane using position coordinates of the elements when the Roof angle of the probe is 0 degrees; And
Rotating the non-loop element plane by a predetermined loop angle to determine the loop element plane
A method of beam focusing of a nondestructive inspection. delete Obtaining a Roof Element plane using position coordinates of the elements of a probe including a transmitter and a receiver having a plurality of elements for transmitting or receiving ultrasonic waves;
Determining a normal vector of the loop element plane;
Determining an incident plane comprising the normal vector;
Obtaining an incident beam vector on a wedge satisfying a given view angle;
Obtaining a refracted beam vector on the test specimen based on the incident beam vector;
Calculating an X-axis coordinate value and a Y-axis coordinate value of the incident beam vector until the Z-axis coordinate value of the incident beam vector becomes 0 along the incident beam vector; And
And advancing the Y-axis coordinate value of the refraction beam vector along the refraction beam vector until the Y-axis coordinate value becomes 0, and determining a focusing depth based on the coordinate value at that time
A method of beam focusing of a nondestructive inspection. delete delete The method according to claim 1,
Characterized in that the non-loop element plane is determined using the center coordinates of at least three elements
A method of beam focusing of a nondestructive inspection. The method according to claim 6,
Wherein the three elements are the first element, the last element and the central element on the probe
A method of beam focusing of a nondestructive inspection. 8. The method of claim 7,
A loop passing through coordinates of a dividing point which is perpendicular to an axis vector passing through the center point of the first element and the last element and which is a boundary point of the transmitting section and the receiving section when the center point of the center element and the loop angle are 0 degrees And a rotation vector (Root rotation vector)
A method of beam focusing of a nondestructive inspection. 9. The method of claim 8,
The loop rotation vector is rotated by the predetermined loop angle other than 0 to determine the division point of the probe having the predetermined loop angle.
A method of beam focusing of a nondestructive inspection. 10. The method of claim 9,
And determines the loop element plane based on the center point of the first element and the center point of the last element and the division point.
A method of beam focusing of a nondestructive inspection. The method according to claim 1,
A beam from the arbitrary element to the field coordinates based on a common straight line between the incidence plane and the refraction plane on the boundary of the wedge and the test piece where the incidence plane and the refraction plane including the refraction beam vector meet with each other, Further comprising the step of determining a time
A method of beam focusing of a nondestructive inspection.

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