Double-source ultrasonic sensor probe core and double-source ultrasonic sensor thereof

Abstract

The invention relates to a double-source ultrasonic sensor probe core and a double-source ultrasonic sensor thereof. The double-source ultrasonic sensor probe core comprises a shell, a partition plate and two piezoelectric elements, the shell is provided with a cavity with an opening formed in the front end face of the shell, the cross section outline of the cavity comprises two opposite straight line sections, two opposite outer arcs and four transition arcs, each outer arc is in the shape of an arc protruding towards the outer side of the cavity, and the four transition arcs are arranged at the corner combination positions of the two straight line sections and the two outer arcs respectively. The partition plate is arranged in the cavity, the top surface of the partition plate is lower than the opening part of the cavity, the bottom of the partition plate is connected with the bottom surface of the cavity, the partition plate is connected with the side surface part of the cavity where the two straight line sections are located to form two sub-cavities, and the cross section of each sub-cavity is composed of an outer arc, two transition arcs adjacent to the outer arc and a partition plate side surface contour line; the contour line of the side face of the partition plate is composed of a middle arc and two end arcs. The method is high in obstacle identification capability and good in decoupling performance.

Description

Technical Field

[0001] The present invention relates to ultrasonic sensor technology. Background Art

[0002] The ultrasonic sensor includes a shell made of metal material and a piezoelectric component. The ultrasonic sensor shell has a cavity with an opening at one end, and the piezoelectric component is arranged in the cavity, wherein the piezoelectric element (such as a piezoelectric ceramic sheet) in the piezoelectric component is fixed to the bottom surface of the cavity (that is, fixed to the bottom plate of the ultrasonic sensor shell). When current flows through the piezoelectric component, the piezoelectric component converts electrical energy into mechanical energy, causing the bottom plate of the ultrasonic sensor shell (the bottom plate is also called a diaphragm) to deform and emit ultrasonic waves. When the ultrasonic wave encounters an obstacle, it is reflected back to the ultrasonic sensor. The physical information such as the distance and size of the obstacle can be judged by the time difference between ultrasonic reception and transmission.

[0003] Currently, most ultrasonic sensors used in reversing radar or detecting obstacles around cars only have one piezoelectric element. They can only judge whether there is an obstacle based on the intensity of a single signal echo. They cannot accurately judge the size or height of the obstacle and need to rely on other sensing devices to assist in judging the obstacle. The Chinese patent application number 201480017488.7 and the invention name "Sensor device and method for vehicle surrounding environment detection" discloses a 3D ultrasonic sensor probe. The 3D ultrasonic sensor probe includes a piezoelectric element and multiple electret sensor elements, which has the function of sending and receiving multiple signals. However, the 3D ultrasonic sensor probe has the disadvantages of complex structure, difficult manufacturing, and large ultrasonic energy loss.

[0004] The paper "Design of a phase array ultrasonic sensor using vibration decoupled concept" published in the June 2008 issue of the Acoustical Society of America describes an ultrasonic sensor probe, such as Figure 1 As shown, the ultrasonic sensor probe core includes a housing 1a and two piezoelectric elements ( Figure 1(not shown in the figure), the shell 1a has a dumbbell shape cavity 100a, and the dumbbell shape cavity 100a includes two kidney-shaped sub-cavities 11a and a middle gap 12a connecting the two kidney-shaped sub-cavities 11a, and two piezoelectric elements are respectively placed in the two sub-cavities 11a. The outer arcs 111a of the two sub-cavities 11a are located on the same circumference. However, the decoupling performance of the ultrasonic sensor core probe is not good, and there is still room for improvement. The meaning of decoupling is to use structural design to make the vibration mode of the piezoelectric element on one side not affect the piezoelectric element on the other side when it is working. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a dual-source ultrasonic sensor probe and a dual-source ultrasonic sensor thereof, which have strong obstacle recognition capability, good decoupling performance, simple structure and are easy to manufacture.

[0006] In the first aspect, the present invention provides a dual-source ultrasonic sensor probe, comprising a shell, a partition and two piezoelectric elements; the shell has a cavity opening at the front end face of the shell, the cavity is surrounded by the cavity bottom face and the cavity side face, and the cross-sectional profile of the cavity has a first symmetry axis and a second symmetry axis; the partition is arranged in the cavity, the top face of the partition is lower than the mouth of the cavity, the bottom of the partition is connected to the cavity bottom face, and the two ends of the partition are respectively connected to the two opposite sides of the cavity side face, forming two sub-cavities that are not connected to each other in the cavity; the two piezoelectric elements are respectively arranged in the two sub-cavities and fixed on the cavity bottom face; wherein the cross-sectional profile of the cavity comprises two opposite straight line segments, two opposite outer arcs and four transition arcs, each outer arc is shaped as an arc convex to the outside of the cavity, the four transition arcs are respectively arranged at the corner junction of the two straight line segments and the two outer arcs, and the two ends of each transition arc are respectively connected to the adjacent outer arcs and straight line segments. Tangentially connected; the first symmetry axis bisects the two straight line segments, and the second symmetry axis bisects the two outer arcs; the two ends of the partition are respectively connected to the side parts of the cavity where the two straight line segments are located, the two opposite sides of the partition are recessed toward each other, and the partition is symmetrical about the first symmetry axis and the second symmetry axis; the cross-sectional profile of each sub-cavity is composed of an outer arc, two transition arcs adjacent to the outer arc, and the side contour line of the partition opposite to the outer arc; the side contour line of the partition is composed of an intermediate arc and two end arcs, the two ends of the intermediate arc are respectively tangentially connected to one end of the two end arcs, the other ends of the two end arcs are respectively connected to the two transition arcs, and the two end arcs are respectively symmetrical with the two transition arcs about the connecting line P1P2, wherein P1 is the intersection point of one of the straight line segments, one of the transition arcs and one of the end arcs, and P2 is the intersection point of another straight line segment, another transition arc and another end arc.

[0007] In a second aspect, the present invention further provides a dual-source ultrasonic sensor, which includes the aforementioned dual-source ultrasonic sensor probe.

[0008] The present invention has at least the following advantages:

[0009] 1. The dual-source ultrasonic sensor probe and the dual-source ultrasonic sensor of the embodiment of the present invention are provided with two piezoelectric elements, so that when detecting obstacles, they can work in a variety of transmission and reception modes, such as one transmission and one reception, one transmission and multiple receptions, and multiple transmissions and multiple receptions. With more echo information, the ultrasonic sensor's ability to detect obstacles and distinguish obstacles is improved;

[0010] 2. The cross-sectional diagram of each sub-cavity of the dual-source ultrasonic sensor probe core of the embodiment of the present invention is composed of six arc segments, and two sub-cavities are blocked by a partition, and the top surface of the partition is lower than the mouth of the cavity of the shell. The dual-source ultrasonic sensor probe core has a good decoupling effect;

[0011] 3. The shapes of the two sub-cavities of the dual-source ultrasonic sensor probe core of the embodiment of the present invention are easy to process and manufacture, and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A top view of a shell of an existing ultrasonic sensor probe is shown.

[0013] Figures 2 to 4 The three-dimensional view, cross-sectional view and top view of the dual-source ultrasonic sensor probe core according to the embodiment of the present invention are respectively shown.

[0014] Figures 5 to 7 The top view, front view and side view of the shell of the dual-source ultrasonic sensor probe core according to the embodiment of the present invention are schematically shown respectively.

[0015] Figure 8 The geometric relationship between the arc segments of the sub-cavity according to the embodiment of the present invention is schematically shown.

[0016] Fig. 9 The center distance of the middle arcs of two sub-cavities according to an embodiment of the present invention is shown.

[0017] Fig.10 The figure shows the distance between the centers of the outer arcs of two sub-cavities according to an embodiment of the present invention.

[0018] Fig.11 The working principle diagram of the dual-source ultrasonic sensor according to an embodiment of the present invention is schematically shown.

[0019] Fig.12 and Fig.13 The top views of the dual-source ultrasonic sensor core probe simulation models numbered V2-1 and V2-2 are shown respectively. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figures 2 to 4 1 and 2 respectively show a stereoscopic view, a cross-sectional view and a top view of a dual-source ultrasonic sensor probe according to an embodiment of the present invention, Figures 5 to 7 The top view, front view and side view of the shell of the dual-source ultrasonic sensor probe core according to an embodiment of the present invention are schematically shown respectively, Figures 2 to 7 The dual-source ultrasonic sensor probe according to the embodiment of the present invention comprises a housing 1 , two piezoelectric elements 2 and a diaphragm 3 .

[0022] The housing 1 has a cavity 10 opened at the front end surface 11 of the housing, and the cavity 10 is surrounded by the cavity bottom surface 10a and the cavity side surface 10b. The cross-sectional profile of the cavity 10 includes two opposite straight line segments 101, two opposite outer arcs 102 and four transition arcs 103. The shape of each outer arc 102 is an arc protruding to the outside of the cavity 10. The four transition arcs 103 are respectively arranged at the corners of the two straight line segments 101 and the two outer arcs 102. The two ends of each transition arc 103 are tangentially connected to the adjacent outer arcs 102 and the straight line segments 101. The cross-sectional profile of the cavity 10 has a first symmetry axis X1 and a second symmetry axis X2. The first symmetry axis X1 bisects the two straight line segments 101 (the first symmetry axis X1 passes through the midpoints of the two straight line segments 101), and the second symmetry axis X2 bisects the two outer arcs 102 (the second symmetry axis X2 passes through the midpoints of the two outer arcs 102).

[0023] The cross section of the cavity 10 of the housing 1 adopts the above-mentioned shape (approximately rectangular), which can obtain different effects of horizontal detection angle and vertical detection angle, so as to reduce the phenomenon of false alarm caused by the ultrasonic sensor detecting the reflected wave signal of the ground. In addition, the cavity with a cross section approximate to a rectangle has a better decoupling effect than the cavity with a circular cross section, and the cavity with a circular cross section can easily transfer the vibration from the sub-cavity on one side to the other side.

[0024] The partition 3 is arranged in the cavity 10, and the top surface 3b of the partition 3 is lower than the mouth of the cavity 10 (i.e., lower than the front end surface 11), which can provide an operating space for manual and equipment operations. The bottom of the partition 3 is connected to the bottom surface 10a of the cavity, and the two ends of the partition 3 are respectively connected to the side parts of the cavity where the two straight line segments 101 are located, forming two unconnected sub-cavities 10c in the cavity 10, and the partition 3 is symmetrical about the first symmetry axis X1 and the second symmetry axis X2. The two opposite side surfaces 31 and 32 of the partition 3 are concave toward each other. The aforementioned unconnected means that there is no gap on the partition 3 to connect the two sub-cavities 10c.

[0025] In this embodiment, the shell 1 is made of metal, such as aluminum. The partition plate 3 and the shell 1 are integrally formed.

[0026] Two piezoelectric elements 2 are respectively arranged in two sub-cavities 10c and fixed on the cavity bottom surface 10a. The piezoelectric element 2 and the cavity bottom surface 10a are fixed in a manner including but not limited to bonding, welding, etc. The piezoelectric element 2 can be made of piezoelectric ceramic sheets, etc.

[0027] In this embodiment, each piezoelectric element 2 is a circular piezoelectric element having a diameter of 5 mm and a thickness of 0.2 mm.

[0028] The cross-sectional profile of each sub-cavity 10c is composed of an outer arc 102, two transition arcs 103 adjacent to the outer arc 102, and a partition side profile line 34 opposite to the outer arc 102. The partition side profile line 34 is composed of an intermediate arc 342 and two end arcs 343, the two ends of the intermediate arc 342 are tangentially connected to one end of the two end arcs 343, the other ends of the two end arcs 343 are connected to the two transition arcs 103, and the two end arcs 343 are symmetrical with the two transition arcs 103 about the connecting line P1P2. P1 is the intersection of one of the straight line segments 101, one of the transition arcs 103, and one of the end arcs 343, and P2 is the intersection of another straight line segment 101, another transition arc 103, and another end arc 343.

[0029] Please refer to Figure 8 , the transition arc 103 and the end arc 343 are both located on the circumference of the circle C3. The circle C3 is tangent to the straight line segment 101 at the point P1. The circle C3 is inscribed in the circle C4 where the middle arc 342 is located at the point P3, and is inscribed in the circle C2 where the outer arc 102 is located at the point P4. The point P3 is the intersection point of the middle arc 342 and the end arc 343, and the point P4 is the intersection point of the outer arc 102 and the transition arc 103.

[0030] Please refer to Fig. 9 and Fig.10In this embodiment, the center distance d5 of the middle arcs of the two sub-cavities is 15.98mm-16.02mm, and the center distance d6 of the outer arcs of the two sub-cavities is 2.63mm-2.67mm. The diameter of the circle C4 where the middle arc is located is 14.22mm-14.26mm, the diameter of the circle C2 where the outer arc is located is 11.08mm-11.12mm, and the diameter of the circle C3 where the transition arc is located (also referred to as the circle C3 where the end arc is located) is 3.98mm-4.02mm. O1 is the center of the circle C4 where the middle arc 342 of one of the sub-cavities is located, and O2 is the center of the circle C4 where the middle arc 342 of the other sub-cavity is located; O3 is the center of the circle C2 where the outer arc 102 of one of the sub-cavities is located, and O4 is the center of the circle C2 where the outer arc 102 of the other sub-cavity is located.

[0031] The distance d1 between the outer arc 102 of each sub-cavity and the piezoelectric element 2 in the sub-cavity is 0.4mm~0.7mm, and the distance d2 between the middle arc 342 of each sub-cavity and the piezoelectric element 2 in the sub-cavity is 0.4mm~0.6mm, so as to ensure that there is enough operating space for automated or manual bonding of piezoelectric elements.

[0032] In this embodiment, the distance d3 between the top surface 3b of the partition 3 and the mouth of the cavity 10 is 3mm to 6mm. At this time, the partition 3 can effectively block the ultrasonic wave emitted by the unilateral piezoelectric element, so that the dual-source sensor core probe can obtain a better decoupling effect. Preferably, the distance d3 between the top surface 3b of the partition 3 and the mouth of the cavity 10 is 4mm to 5mm.

[0033] In this embodiment, the housing 1 includes a circular bottom plate 1c and an annular peripheral wall portion 1d, the bottom end of the peripheral wall portion 1d is connected to the periphery of the bottom plate 1c, and the two together form a cylindrical housing body and define the aforementioned cavity 10. The outer diameter D1 of the bottom plate 1c is 15.4 mm to 15.5 mm. The height H of the housing 1 is 9.55 mm to 9.6 mm. The thickness t1 of the bottom plate 1c is 0.48 mm to 0.52 mm.

[0034] The working process and working principle of the dual-source ultrasonic sensor core probe using the dual-source ultrasonic sensor according to the embodiment of the present invention are roughly as follows.

[0035] The PCBA circuit board drives the probe to emit ultrasonic waves. When the ultrasonic signal in the air contacts an obstacle, it will form a reflected signal. After propagating through the air, the reflected signal contacts the metal bottom plate of the shell and is transmitted to the two piezoelectric elements through the metal bottom plate. The piezoelectric element generates an electrical signal and transmits it back to the PCBA circuit board, and transmits the signal to the industrial computer through the PCBA circuit board. As needed, the dual-source ultrasonic sensor can adopt one of the following transmission and reception modes: one-transmit-one-receive mode, that is, one piezoelectric element transmits and receives; one-transmit-multiple-receive mode, that is, one piezoelectric element transmits and two piezoelectric elements receive; multiple-transmit-multiple-receive mode, that is, two piezoelectric elements transmit and receive at the same time, or two piezoelectric elements transmit at the same time and one piezoelectric element receives.

[0036] In the multiple transmission and multiple reception mode, two piezoelectric elements 2 are arranged up and down. According to the receiving time difference of the two ultrasonic echo signals, the industrial computer can use the triangulation positioning method to calculate the distance and height size of the obstacle, so as to obtain more obstacle information. For its working principle, please refer to Fig.11 The obstacle S receives the ultrasonic signal and forms a reflected echo signal. The piezoelectric element 2 above and the piezoelectric element 2 below will receive the ultrasonic echo signal at different times. Fig.11 It can be seen that the propagation distance SP2 of the ultrasonic signal emitted by the lower piezoelectric element 2 is much longer than the propagation distance SP1 of the ultrasonic signal emitted by the upper piezoelectric element 2. The industrial computer uses two sets of different ultrasonic echo signals for analysis to infer the distance, size and height of the obstacle.

[0037] Table 1 shows the ultrasonic sensor simulation software. Fig.12 and Fig.13The simulation results of the simulation model of the dual-source ultrasonic sensor probe core with two kidney-shaped sub-cavities shown in the figure, wherein the diameter D1 of the bottom plate of the dual-source ultrasonic sensor as the simulation model is 15.5mm, the thickness t1 of the bottom plate is 0.5mm, and the shell height H of the dual-source ultrasonic sensor probe core is 9.6mm. The two piezoelectric elements 2 are circular piezoelectric elements with a diameter of 5mm and a thickness of 0.2mm. The cavity shape of NA means that the shell is not provided with a cavity, but only with two sub-cavities; the diameter of the circle where the outer arc of the two sub-cavities is located is 14mm. The partition depth refers to the distance d3 between the top surface of the partition and the mouth of the cavity. If the top surface of the partition is flush with the mouth of the cavity of the shell (i.e., the front end surface of the shell), it is represented by NA. The displacement refers to the vibration displacement of the ultrasonic sensor at a certain frequency in the simulation, and the magnitude of the displacement is proportional to the sound pressure of the ultrasonic wave generated by the ultrasonic sensor. Displacement 1 and displacement 2 are the displacements of one piezoelectric element and the other piezoelectric element, respectively, wherein one piezoelectric element is in the emission state and has displacement 1, and the other piezoelectric element is not working and has displacement 2. The decoupling ratio is the ratio of the larger displacement to the smaller displacement.

[0038] Table 1

[0039]

[0040] The shapes of the dual-source ultrasonic sensor core probe simulation models numbered V2-1 and V2-2 are derived from the paper published in the June 2008 journal of the Acoustical Society of America in the background technology section. The shapes of the two sub-cavities are both kidney-shaped. The difference is that V2-1 does not have a cavity but directly sets two sub-cavities 11e, and the top surface of the partition 3e is flush with the front end surface of the shell. V2-2 sets a cylindrical cavity 100f, and two sub-cavities 11f are formed in the cavity 100f, and the top surface of the partition 3f is lower than the mouth of the cavity 100f. Fig.12 The outer arcs 111e of the two sub-cavities 11e of V2-1 are shown, and the two outer arcs 111e are located on the same circle with a diameter equal to 14 mm; Fig.13 The outer arcs 111f of the two sub-cavities 11f of V2-2 are shown. The two outer arcs 111f are also located on the same circle with a diameter of 14 mm. The two outer arcs 111f are co-centered and co-circumferential with the cavity 100f. As shown in Table 1, the decoupling ratio of the dual-source ultrasonic sensor core probe simulation model numbered V2-1 is the highest, but it is only 4.25.

[0041] Table 2 shows the simulation results of the dual-source ultrasonic sensor probe core simulation models numbered V4-1 to V4-4 using ultrasonic sensor simulation software. The dual-source ultrasonic sensor probe core simulation models numbered V4-1 to V4-4 are similar to the dual-source ultrasonic sensor probe core of the aforementioned embodiment of the present invention (for specific shapes, please refer to Figures 2 to 4 ) are consistent in shape, and the shapes of the two sub-cavities are both rice grain-shaped (i.e. Figure 2 and Figure 4 The shape of the sub-cavity shown in the figure is different in that the depth of the partition (i.e., the distance d3 between the top surface of the partition and the mouth of the cavity) is different. Among them, the diameter D1 of the bottom plate of the dual-source ultrasonic sensor probe core as a simulation model is 15.5mm, the thickness t1 of the bottom plate is 0.5mm, and the shell height H of the dual-source ultrasonic sensor probe core is 9.6mm. The center distance d5 of the middle arc of the two sub-cavities is 16mm, and the center distance d6 of the outer arc of the two sub-cavities is 2.65mm. The diameter of the circle where the middle arc of each sub-cavity is located is 14.24mm, the diameter of the circle where the outer arc is located is 11.1mm, and the diameter of the circle where the transition arc is located is 4mm. The two piezoelectric elements 2 are circular piezoelectric elements with a diameter of 5mm and a thickness of 0.2mm. The distance d1 between the piezoelectric element of each sub-cavity and the outer arc is 0.5mm, and the distance d2 between the piezoelectric element of each sub-cavity and the middle arc is 0.45mm.

[0042] Table 2

[0043]

[0044] It can be seen from Table 2 that the decoupling ratio of the dual-source ultrasonic sensor core probe simulation model numbered V4-3 is the highest, reaching 24.

[0045] In some specific applications, the dual-source ultrasonic sensor probe core of the aforementioned embodiment of the present invention is used as a probe core of a vehicle ultrasonic sensor for use in a reversing radar or detecting obstacles around a car.

[0046] The dual-source ultrasonic sensor probe and the dual-source ultrasonic sensor of the embodiment of the present invention are provided with two piezoelectric elements, so that they can work in a variety of transmission and reception modes, such as one transmission and one reception, one transmission and multiple receptions, and multiple transmissions and multiple receptions. With more echo information, the ultrasonic sensor's ability to detect obstacles and distinguish obstacles is improved. The cross-sectional diagram of each sub-cavity of the dual-source ultrasonic sensor probe is composed of six arcs, and the two sub-cavities are blocked by a partition, and the top surface of the partition is lower than the mouth of the cavity of the shell, so that the dual-source ultrasonic sensor probe has a good decoupling effect.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A dual-source ultrasonic sensor probe, comprising a shell, a partition and two piezoelectric elements; the shell has a cavity opening at the front end face of the shell, the cavity is surrounded by the cavity bottom face and the cavity side face, and the cross-sectional profile of the cavity has a first symmetry axis and a second symmetry axis; the partition is arranged in the cavity, the top face of the partition is lower than the mouth of the cavity, the bottom of the partition is connected to the cavity bottom face, the two ends of the partition are respectively connected to the two opposite sides of the cavity side face, and two sub-cavities that are not connected to each other are formed in the cavity; the two piezoelectric elements are respectively arranged in the two sub-cavities and fixed on the cavity bottom face; it is characterized in that, The cross-sectional profile of the cavity includes two opposite straight line segments, two opposite outer arcs and four transition arcs, each of the outer arcs is in the shape of an arc protruding toward the outside of the cavity, the four transition arcs are respectively arranged at the corner junctions of the two straight line segments and the two outer arcs, and the two ends of each transition arc are respectively tangently connected to the adjacent outer arcs and straight line segments; the first symmetry axis bisects the two straight line segments, and the second symmetry axis bisects the two outer arcs; The two ends of the partition are respectively connected to the side surfaces of the cavity where the two straight line segments are located, the two opposite side surfaces of the partition are concave toward each other, and the partition is symmetrical about the first symmetry axis and the second symmetry axis; The cross-sectional profile of each sub-cavity is composed of an outer arc, two transition arcs adjacent to the outer arc, and a side contour line of the partition opposite to the outer arc; the side contour line of the partition is composed of an intermediate arc and two end arcs, the two ends of the intermediate arc are respectively tangentially connected to one end of the two end arcs, the other ends of the two end arcs are respectively connected to the two transition arcs, and the two end arcs are respectively symmetrical with the two transition arcs about the connecting line P1P2, wherein P1 is the intersection of one of the straight line segments, one of the transition arcs and one of the end arcs, and P2 is the intersection of another straight line segment, another transition arc and another end arc.

2. The dual-source ultrasonic sensor core probe according to claim 1, characterized in that: The distance between the top surface of the partition and the mouth of the cavity is 3 mm to 6 mm.

3. The dual-source ultrasonic sensor core probe according to claim 2, characterized in that: The height of the shell is 9.55 mm to 9.6 mm.

4. The dual-source ultrasonic sensor core probe according to claim 1, characterized in that: The distance between the centers of the middle arcs of the two sub-cavities is 15.98 mm to 16.02 mm, and the distance between the centers of the outer arcs of the two sub-cavities is 2.63 mm to 2.67 mm.

5. The dual-source ultrasonic sensor core probe according to claim 4, characterized in that: The diameter of the circle where the middle arc is located is 14.22mm-14.26mm, the diameter of the circle where the outer arc is located is 11.08mm-11.12mm, and the diameter of the circle where the transition arc is located is 3.98mm-4.02mm.

6. The dual-source ultrasonic sensor core probe according to any one of claims 1 to 5, characterized in that: The housing comprises a circular bottom plate and an annular peripheral wall portion, wherein the bottom end of the peripheral wall portion is connected to the peripheral edge of the bottom plate; The outer diameter of the bottom plate is 15.4 mm to 15.5 mm.

7. The dual-source ultrasonic sensor core probe according to claim 6, characterized in that: The thickness of the bottom plate is 0.48 mm to 0.52 mm.

8. The dual-source ultrasonic sensor core probe according to claim 1, characterized in that: The piezoelectric element is a circular piezoelectric element.

9. The dual-source ultrasonic sensor core probe according to claim 8, characterized in that: The diameter of the circular piezoelectric element is 5 mm.

10. The dual-source ultrasonic sensor core probe according to claim 1, characterized in that: The shell is made of metal; The partition plate is integrally formed with the shell.

11. A dual-source ultrasonic sensor, characterized in that: The dual-source ultrasonic sensor comprises the dual-source ultrasonic sensor probe according to any one of claims 1 to 10.

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