CN111948628A - Design method of ultrasonic phased array ring array with segmented focusing - Google Patents

Design method of ultrasonic phased array ring array with segmented focusing Download PDF

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CN111948628A
CN111948628A CN202010804339.2A CN202010804339A CN111948628A CN 111948628 A CN111948628 A CN 111948628A CN 202010804339 A CN202010804339 A CN 202010804339A CN 111948628 A CN111948628 A CN 111948628A
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array
focal length
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ring
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CN111948628B (en
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王子成
韩志雄
桂琳琳
金耀辉
闵力
杨文�
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Wuhan Zhongke Innovation Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • 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
    • G01N29/24—Probes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/106—Number of transducers one or more transducer arrays

Abstract

The invention relates to the technical field of a ring array, in particular to a design method of a segmented focusing ultrasonic phased array ring array, which comprises a ring array probe, wherein the phased array ring array probe can focus an electronic phased array in a larger focusing range, the focusing range is divided into a plurality of focal length sections, when the phased array ring array probe is focused in a closer focal length section, a plurality of array-member rings on an inner layer are used for focusing, the focusing quality is ensured by the design of a focusing coefficient, when the phased array ring array probe is focused in a farther focal length section, the array members on the outer layer of each section are gradually added for common focusing, the focusing performance of a farther distance is ensured, the area of the array members is increased section by section focusing, the width of the outer ring of a large-aperture probe with a larger focal length is larger, the manufacturing process difficulty is reduced, and the consistency of the focusing capability of the farther and nearer different focal lengths is.

Description

Design method of ultrasonic phased array ring array with segmented focusing
Technical Field
The invention relates to the technical field of a ring array, in particular to a design method of a segmented focusing ultrasonic phased array ring array.
Background
The ring array technology adopts concentric ring array probes to realize the emission and the reception of transverse focusing sound beams, each ring is an independent array element, the transverse focusing with circumferential symmetry is realized through the phased array technology, the focusing sound beams have smaller size in a transverse two-dimensional coordinate, the focus is distributed on the central axis of the probe, the phased array ultrasonic technology adopts the phase delay of each array element and the sound field or signal of overlapping a plurality of array elements to realize the synthesis of the focusing sound beams, the general design is that the area of each array element is approximately equal, the outer diameter of each array element is approximately proportional to the square root of the sequence number of the array elements from inside to outside, and the phased array ultrasonic technology is also called a Fresnel ring array. The design method of the fresnel ring array is as follows: and determining the size and the area of the array elements at the innermost circle according to the nearest application focal distance, and then determining the number of the array elements and the diameter of the array elements at the outermost circle according to the farthest application focal distance. This design has two effects: firstly, the signal intensity of array elements participating in the superimposed independent phase delay is approximately balanced; secondly, all the array elements are small enough, and the transmission delay phase difference from any point on a single array element to a point outside the near-field distance N1 of the first wafer circle at the center does not exceed. However, as the serial number of the array element increases, the width of the array element annulus decreases rapidly, and when the serial number of the array element is large, the width becomes very small, which increases the difficulty of manufacturing, so the number of the array element is limited, and therefore a design method of the ultrasonic phased array annulus with segmented focusing is needed to improve the problems.
Disclosure of Invention
The invention aims to provide a design method of a segmented focused ultrasonic phased array ring array, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a design method of a segmented focused ultrasonic phased array ring array comprises a ring array probe, and comprises the following design method steps:
s1, dividing the application focusing range of the annular array probe into a plurality of sections with end points arranged according to an integer m equal ratio, designing the required size and number of the annular array elements for each section of the focal length range in sequence according to the set focusing coefficient, adding a plurality of array element rings outside the front focal length section array in the subsequent focal length section, and increasing the outer diameter increment cardinal number of each ring along with the increase of the number of the focal length sections;
s2, dividing the applied focusing range of the annular array probe into a plurality of sections with end points arranged according to an integer m equal ratio, and assuming a nearest focal length F1The farthest focal length F2The focal length is segmented as: f1To mF1、mF1To m2F1、……mT-1F1To mTF1Where T is the total extended focal length number, such that mT-1F1Less than F2And m isTF1Greater than or equal to F2(ii) a Setting integral focusing coefficient k, where k is the ratio of the near-field distance N of the synthetic aperture and the maximum focal length in the focal length segment, the array element number in the first segment of focal length range is m × k, and the outer diameter of each array element is
Figure BDA0002628541160000021
Where n ∈ [1, m × k ]]Is the array element number; λ is the ultrasonic wavelength; wherein s is the sequence number of the newly added array element, s belongs to [1, (m-1) × k](ii) a λ is the ultrasonic wavelength;
s3, setting an integral focusing coefficient k; determining the number m x k of array elements of the first focal length section; determining the outer diameter of each array element of the section
Figure BDA0002628541160000022
Each focus section is increased by (m-1) k array elements, and the outer diameter of each array element is
Figure BDA0002628541160000023
Wherein: s is the sequence number of the newly added array element in the segment, and s belongs to [1, (m-1) × k](ii) a T is the sequence number of the focal length segment in which T belongs to [1, T ∈](ii) a Taking the starting point of each focal length section as the starting pointCritical near field distance, the aperture of the base circle is calculated as
Figure BDA0002628541160000024
The ultrasonic transmission delay phases of all points in the base circle reaching the focal length section are of the same sign, so that the base circle is used as a first circle of the Fresnel ring array, the Fresnel ring array with m x k array elements can be designed by taking the first circle as a basic size, the first k array elements of the Fresnel ring array are overlapped with the Fresnel ring array of the previous focal length section, and each array element is a set of integral array elements of the inner Fresnel ring and is sequentially pushed to the Fresnel ring array of the first focal length section;
s4, the focal range integer m equal proportion segmentation method and integer multiple equal proportion expansion segmentation method are applied to enable the initial focal length of each segment to be in integer multiple proportion relation, so that the inner ring array elements form a unit group of a subsequent focal length segment according to each integer m array elements, the sum of each group of array elements is still small enough for the subsequent focal length segment, is matched with the area of a newly added array element, and is focused to the back segment focal length together;
s5, determining the size of the newly added array element according to the starting point of each focal length range, wherein the method determines that the square difference of the radius of the newly added array element in the focal length range is equal to the focal length m of the adjacent starting pointtλF1(the array element area is constant);
s6, setting integral multiple minimum focusing coefficient k to determine the number and outer diameter of array elements of the segmented array, wherein the focusing coefficient k and the proportional coefficient m of focal length segmentation determine the number m × k of each array element segment, and also determine the maximum aperture of each array element segment, so that the focusing performance is ensured, and the integral multiple minimum focusing coefficient k design also enables the number m × k of the array elements of the inner layer designed by the previous focal length segment to form an integral number k group;
s7, setting integral multiple minimum focusing coefficient k to determine the number and outer diameter of array elements of the segmented array, wherein the focusing coefficient k and the proportional coefficient m of focal length segmentation determine the number m × k of each array element segment, and also determine the maximum aperture of each array element segment, thereby ensuring the focusing performance, and the integral multiple minimum focusing coefficient k design also enables the array element number m × k of the inner layer designed by the previous focal length segment to form an integral number k group.
Preferably, the annular array probe is configured as a 20-array annular array probe.
Preferably, the types of the annular array probe are as follows: HS5R20F5m2k4, center frequency 5 MHz; a circular array of array elements 20; the closest focusing distance is 5mm, a focal length expansion factor with the proportion number m of 2 is adopted, and the farthest focusing distance can reach 80 mm; the maximum outer diameter of the array element is 39mm, the array element is cut according to the outer diameter dimension, and the groove width is phi, so that the value of 0.015mm is less than or equal to phi, and is less than or equal to 0.1 mm.
Preferably, the (m, k) parameters are: (2, 2), (2, 3), (3, 2), (3, 3) and (4, 2).
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the equal ratio segmentation of the integer is carried out through the focal length range; setting integral focusing coefficient to balance full-range focusing capacity; the newly added array elements in the focal length range of each section are equal in area, and the area base number is enlarged in an equal ratio; the inner ring array elements of a front section can form array element groups with equal areas according to integers, the focusing phase delay of each group of array elements is close or the same, the phased array ring array probe can focus on an electronic phased array in a large focusing range, the focusing range is divided into a plurality of focal length sections, when the phased array ring array probe is focused on a near focal length section, a plurality of array element rings of an inner layer are used for focusing, the focusing quality is ensured by the design of a focusing coefficient, when the phased array ring array probe is focused on a far focal length section, the array elements of each outer layer are gradually added for focusing together, the focusing performance at a far distance is ensured, the area of the array elements is increased section by section focusing, the outer ring width of the large-aperture probe with a large focal length is larger, the manufacturing process difficulty is reduced, and the consistency of the focusing capacity at far and near different focal lengths is ensured by the design of a focusing coefficient.
Drawings
FIG. 1 is a schematic diagram of an integral array of the present invention;
FIG. 2 is a profile view of an integral probe of the present invention;
FIG. 3 is a sectional view of the overall focal zone of the present invention;
FIG. 4 is a schematic diagram of the focusing aperture of the array corresponding to the overall different focal length segments of the present invention;
FIG. 5 is a schematic view of the first Fresnel circle corresponding to the focal length segment as a whole according to the present invention;
fig. 6 is a schematic diagram of a fresnel ring array of the integral focal length section according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution:
a design method of a segmented focused ultrasonic phased array ring array comprises a ring array probe, and comprises the following design method steps:
s1, dividing the application focusing range of the annular array probe into a plurality of sections with end points arranged according to an integer m equal ratio, designing the required annular array element size and array element number for each section of focal length range in turn according to the set focusing coefficient, adding a plurality of array element rings outside the front focal length section array in the subsequent focal length section, and increasing the outer diameter increment cardinal number of each ring along with the increase of the number of the focal length sections;
s2, dividing the applied focusing range of the annular array probe into a plurality of sections with end points arranged according to an integer m equal ratio, and assuming a nearest focal length F1The farthest focal length F2The focal length is segmented as: f1To mF1、mF1To m2F1、……mT-1F1To mTF1Where T is the total extended focal length number, such that mT-1F1Less than F2And m isTF1Greater than or equal to F2(ii) a Setting integral focusing coefficient k, where k is the ratio of the near-field distance N of the synthetic aperture and the maximum focal length in the focal length segment, the array element number in the first segment of focal length range is m × k, and the outer diameter of each array element is
Figure BDA0002628541160000051
Wherein s is the sequence number of the newly added array element, s belongs to [1, (m-1) × k](ii) a λ is the ultrasonic wavelength;
s3, setting an integral focusing coefficient k; determining the number m x k of array elements of the first focal length section; determining the outer diameter of each array element of the section
Figure BDA0002628541160000052
Each focus section is increased by (m-1) k array elements, and the outer diameter of each array element is
Figure BDA0002628541160000053
Wherein: s is the sequence number of the newly added array element in the segment, and s belongs to [1, (m-1) × k](ii) a T is the sequence number of the focal length segment in which T belongs to [1, T ∈](ii) a The aperture of the base circle is calculated by taking the starting point of each focal length section as the critical near-field distance
Figure BDA0002628541160000054
The ultrasonic transmission delay phases of all points in the base circle reaching the focal length section are of the same sign, so that the base circle is used as a first circle of the Fresnel ring array, the Fresnel ring array with m x k array elements can be designed by taking the first circle as a basic size, the first k array elements of the Fresnel ring array are overlapped with the Fresnel ring array of the previous focal length section, and each array element is a set of integral array elements of the inner Fresnel ring and is sequentially pushed to the Fresnel ring array of the first focal length section;
s4, the focal range integer m equal proportion segmentation method and integer multiple equal proportion expansion segmentation method are applied to enable the initial focal length of each segment to be in integer multiple proportion relation, so that the inner ring array elements form a unit group of a subsequent focal length segment according to each integer m array elements, the sum of each group of array elements is still small enough for the subsequent focal length segment, is matched with the area of a newly added array element, and is focused to the back segment focal length together;
s5, determining the size of the newly added array element according to the starting point of each focal length range, wherein the method determines that the square difference of the radius of the newly added array element in the focal length range is equal to the focal length m of the adjacent starting pointtλF1(the array element area is constant);
s6, setting integral multiple minimum focusing coefficient k to determine the number and outer diameter of array elements of the segmented array, wherein the focusing coefficient k and the proportional coefficient m of focal length segmentation determine the number m × k of each array element segment, and also determine the maximum aperture of each array element segment, so that the focusing performance is ensured, and the integral multiple minimum focusing coefficient k design also enables the number m × k of the array elements of the inner layer designed by the previous focal length segment to form an integral number k group;
s7, setting integral multiple minimum focusing coefficient k to determine the number and outer diameter of array elements of the segmented array, wherein the focusing coefficient k and the proportional coefficient m of focal length segmentation determine the number m × k of each array element segment, and also determine the maximum aperture of each array element segment, thereby ensuring the focusing performance, and the integral multiple minimum focusing coefficient k design also enables the array element number m × k of the inner layer designed by the previous focal length segment to form an integral number k group.
The ring array probe is arranged into a 20-array ring array probe.
The types of the annular array probe are as follows: HS5R20F5m2k4, center frequency 5 MHz; a circular array of array elements 20; the closest focusing distance is 5mm, a focal length expansion factor with the proportion number m of 2 is adopted, and the farthest focusing distance can reach 80 mm; the maximum outer diameter of the array element is 39mm, the array element is cut according to the outer diameter, the groove width is between 0.015mm and 0.1mm, and the cutting process is used for determining the width of the groove.
The (m, k) parameters are: (2, 2), (2, 3), (3, 2), (3, 3) and (4, 2), the protection range is that the relative deviation of the outer diameters of all array elements does not exceed +/-15% according to the proportionality coefficient.
Example (b): an example of a 20-array ring array probe, the type of the probe is: HS5R20F5m2k4, the specific specifications of the probe are as follows: the central frequency is 5 MHz; a circular array of array elements 20; the closest focus distance is 5 mm. The parameters that the proportional number m is 2 and the minimum focusing integer coefficient k is 4 are calculated according to the design method, and the following parameters are obtained: the farthest focusing distance can reach 80 mm; the maximum array element outer diameter is 39mm, and the array is shown in figure 1; the overall dimension of the probe is shown in figure 2; the outer diameter of each array element is shown in table 1, the array elements are cut according to the outer diameter, the groove width is between 0.015mm and 0.1mm, the cutting process determines that the smaller the array element is, the better the array element is, the application focusing range of the array probe is divided into a plurality of sections according to the geometric progression of integers, the size and the number of the array elements of the ring array required by each section of focal length range are designed in sequence according to the set focusing coefficient, a plurality of array-element rings are added outside the front focal length section array in the subsequent focal length section, and the outer diameter increment cardinal number of each ring is along with the focal length sectionAn increase in the number; the following sets of parameters (m, k): (2, 2), (2, 3), (3, 2), (3, 3) and (4, 2), the protection range is that the relative deviation of the outer diameters of all array elements does not exceed +/-15% according to the proportionality coefficient; referring to FIG. 3, the applied focus range of the annular array probe is first divided into several segments by an integer m, assuming the nearest focal length F1The farthest focal length F2The focal length is segmented as: f1To mF1、mF1To m2F1、……mT-1F1To mTF1Where T is the total extended focal length number, such that mT-1F1Less than F2And m isTF1Greater than or equal to F2(ii) a Setting integral focusing coefficient k, where k is the ratio of the near-field distance N of the synthetic aperture and the maximum focal length in the focal length segment, the array element number in the first segment of focal length range is m × k, and the outer diameter of each array element is
Figure BDA0002628541160000071
Where n ∈ [1, m × k ]]Is the array element number; λ is the ultrasonic wavelength; referring to fig. 4, 5 and 6, firstly, dividing the application focal range of the annular array probe into a plurality of sections according to an integer m; setting an integral focusing coefficient k; determining the number m x k of array elements of the first focal length section; determining the outer diameter of each array element of the section
Figure BDA0002628541160000072
Each focus section is increased by (m-1) k array elements, and the outer diameter of each array element is
Figure BDA0002628541160000073
Where s e [1, (m-1). k]Is the sequence number of the newly added array element in the segment, and T belongs to [1, T ∈]The number is the serial number of the focal length section; the aperture of the base circle is calculated by taking the starting point of each focal length section as the critical near-field distance
Figure BDA0002628541160000074
The ultrasonic transmission delay phases of all points in the base circle reaching the focal length section are of the same sign, so that the base circle is used as the first circle of the Fresnel annular array, and the Fresnel annular array can be designed into m x k array elements by taking the first circle as the basic sizeThe Fresnel ring array of the first focal length section is formed by the following steps that (1) a Fresnel ring array is formed, wherein the front k array elements of the Fresnel ring array are overlapped with a Fresnel ring array of the previous focal length section, each array element is a set of integral array elements of an inner Fresnel ring, and the array elements are pushed to the Fresnel ring array of the first focal length section in a one-step mode; the method of integral m equal proportion segmentation and integral multiple equal proportion expansion of the applied focal range leads the initial focal length of each segment to be in integral multiple proportion relation, thereby leading the inner ring array elements to form a unit group of a subsequent focal length segment according to each integral m array elements, leading the sum of each group of array elements to be still small enough for the subsequent focal length segment and to be matched with the area of a newly added array element, and focusing the array elements to the focal length of a rear segment together; a method for determining the size of newly added array element based on the starting point of each focal length range includes such steps as determining the square difference between the radius of newly added array element in focal length range and the focal length m of adjacent starting pointtλF1(the array element area is constant); the method for determining the number and the outer diameter of the array elements of the segmented array by setting the integral multiple of the minimum focusing coefficient k, wherein the number m x k of each array element segment is determined by the focusing coefficient k and the proportional coefficient m of focal length segmentation, the maximum aperture of each array element segment is also determined, the focusing performance is ensured, and the integral multiple of the minimum focusing coefficient k is designed to ensure that the number m x k of the array elements of the inner layer designed by the previous focal length segment can form an integral multiple of k groups; the method for determining the number and the outer diameter of the array elements of the segmented array by setting the integral multiple of the minimum focusing coefficient k, wherein the number m x k of each array element segment is determined by the focusing coefficient k and the proportional coefficient m of the focal length segmentation, the maximum aperture of each array element segment is also determined, the focusing performance is ensured, and the integral multiple of the minimum focusing coefficient k is designed to ensure that the number m x k of the array elements of the inner layer designed by the previous focal length segment can form an integral multiple of k groups.
Figure BDA0002628541160000081
Figure BDA0002628541160000091
TABLE 1
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. A design method of a segmented focused ultrasonic phased array ring array comprises a ring array probe, and is characterized in that: the method comprises the following design method steps:
s1, dividing the application focusing range of the annular array probe into a plurality of sections with end points arranged according to an integer m equal ratio, designing the required size and number of the annular array elements for each section of the focal length range in sequence according to the set focusing coefficient, adding a plurality of array element rings outside the front focal length section array in the subsequent focal length section, and increasing the outer diameter increment cardinal number of each ring along with the increase of the number of the focal length sections;
s2, dividing the applied focusing range of the annular array probe into a plurality of sections with end points arranged according to an integer m equal ratio, and assuming a nearest focal length F1The farthest focal length F2The focal length is segmented as: f1To mF1、mF1To m2F1、……mT-1F1To mTF1Where T is the total extended focal length number, such that mT-1F1Less than F2And m isTF1Greater than or equal to F2(ii) a Setting integral focusing coefficient k, where k is the ratio of the near-field distance N of the synthetic aperture and the maximum focal length in the focal length segment, the array element number in the first segment of focal length range is m × k, and the outer diameter of each array element is
Figure FDA0002628541150000011
Where n ∈ [1, m × k ]]Is the array element number; λ is the ultrasonic wavelength; wherein s is the sequence number of the newly added array element, s belongs to [1, (m-1) × k](ii) a λ is the ultrasonic wavelength;
s3, setting an integral focusing coefficient k; determining the number m x k of array elements of the first focal length section; determining the outer diameter of each array element of the section
Figure FDA0002628541150000012
Adding (m-1) k array elements to each focal length sectionOuter diameter of
Figure FDA0002628541150000013
Wherein: s is the sequence number of the newly added array element in the segment, and s belongs to [1, (m-1) × k](ii) a T is the sequence number of the focal length segment in which T belongs to [1, T ∈](ii) a The aperture of the base circle is calculated by taking the starting point of each focal length section as the critical near-field distance
Figure FDA0002628541150000014
The ultrasonic transmission delay phases of all points in the base circle reaching the focal length section are of the same sign, so that the base circle is used as a first circle of the Fresnel ring array, the Fresnel ring array with m x k array elements can be designed by taking the first circle as a basic size, the first k array elements of the Fresnel ring array are overlapped with the Fresnel ring array of the previous focal length section, and each array element is a set of integral array elements of the inner Fresnel ring and is sequentially pushed to the Fresnel ring array of the first focal length section;
s4, applying a focal length range integer m equal proportion segmentation method and an integer multiple equal proportion expansion segmentation method to enable the initial focal length of each segment to be in integer multiple proportion relation, so that the inner ring array elements form a unit group of a subsequent focal length segment according to each integer m array elements, the sum of each group of array elements is still small enough for the subsequent focal length segment, is matched with the area of a newly added array element, and focuses on the focal length of the rear segment together;
s5, determining the size of the newly added array element according to the starting point of each focal length range, wherein the method determines that the square difference of the radius of the newly added array element in the focal length range is equal to the focal length m of the adjacent starting pointtλF1(the array element area is constant);
s6, setting integral multiple minimum focusing coefficient k to determine the number and outer diameter of array elements of the segmented array, wherein the focusing coefficient k and the proportional coefficient m of focal length segmentation determine the number m × k of each array element segment, and also determine the maximum aperture of each array element segment, so that the focusing performance is ensured, and the integral multiple minimum focusing coefficient k design also enables the number m × k of the array elements of the inner layer designed by the previous focal length segment to form an integral number k group;
s7, setting integral multiple minimum focusing coefficient k to determine the number and outer diameter of array elements of the segmented array, wherein the focusing coefficient k and the proportional coefficient m of focal length segmentation determine the number m × k of each array element segment, and also determine the maximum aperture of each array element segment, thereby ensuring the focusing performance, and the integral multiple minimum focusing coefficient k design also enables the array element number m × k of the inner layer designed by the previous focal length segment to form an integral number k group.
2. The design method of the segmented focused ultrasonic phased array ring array according to claim 1, characterized in that: the ring array probe is arranged into a 20-array ring array probe.
3. The design method of the segmented focused ultrasonic phased array ring array according to claim 1, characterized in that: the types of the annular array probe are as follows: HS5R20F5m2k4, center frequency 5 MHz; a circular array of array elements 20; the closest focusing distance is 5mm, a focal length expansion factor with the proportion number m of 2 is adopted, and the farthest focusing distance can reach 80 mm; the maximum outer diameter of the array element is 39mm, the array element is cut according to the outer diameter dimension, and the groove width is phi, so that the value of 0.015mm is less than or equal to phi, and is less than or equal to 0.1 mm.
4. The design method of the segmented focused ultrasonic phased array ring array according to claim 1, characterized in that: the (m, k) parameters are: (2, 2), (2, 3), (3, 2), (3, 3) and (4, 2).
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