Ultrasonic field detection device and ultrasonic emission detection system

Abstract

The application provides an ultrasonic field detection device and an ultrasonic emission detection system. The detection device comprises a container for containing a sound guide medium, an ultrasonic field detection unit, a rotating mechanism and a processing unit. The bottom of the container is provided with a mounting position. Each group of ultrasonic field detection units comprises a light emitting unit and a camera unit oppositely arranged on both sides of the container along an optical axis. The optical axis is orthogonal to the axis of the ultrasonic field generated by the ultrasonic generation unit. At least one group of ultrasonic field detection units is rotatable to a plurality of different stations around the axis of the ultrasonic field under the action of the rotating mechanism. The light emitting unit is used for emitting detection light at the plurality of different stations. The camera unit is used for correspondingly collecting image information of the detection light deflected through the ultrasonic field at the different stations. The processing unit generates a three-dimensional image of the ultrasonic field based on the collected image information at the plurality of different stations. Thus, the ultrasonic field emitted by the ultrasonic emitter can be detected non-destructively.

Description

Technical Field

[0001] This application relates to the field of ultrasonic technology, and more specifically, to an ultrasonic field detection device and an ultrasonic emission detection system. Background Technology

[0002] In the research and development of ultrasound diagnostic and therapeutic equipment, the measurement of the ultrasound field is a crucial step. Ultrasound field visualization technology can visually display the distribution of the sound field and measure parameters such as wavelength, sound velocity, and sound pressure. Hydrophone technology is a primary method for sound field visualization.

[0003] The working principle of a hydrophone is to convert the sound pressure signal on the sensor surface into an electrical signal, and then convert the electrical signal into a digital signal through an analog-to-digital converter. High-frequency ultrasonic waves attenuate greatly in rarefied media such as air. During the measurement process, the ultrasonic transmitting unit can be immersed in the sound-conducting medium, and the hydrophone and the ultrasonic transmitting unit are set at intervals to measure the propagation of ultrasonic waves in the sound-conducting medium.

[0004] Because hydrophones need to be placed within an acoustic field, their own structure can affect the sound field and may cause ultrasonic wave reflections, thus affecting measurement accuracy. Furthermore, 3D modeling requires adjusting the hydrophone's position, further complicating the equipment and leading to significant distortion in the 3D model. Summary of the Invention

[0005] To at least partially address the problems existing in the prior art, one aspect of this application provides an ultrasonic field detection device, comprising: a container for containing a sound-conducting medium, the bottom of which is provided with a mounting position for mounting an ultrasonic emitting unit; at least one set of ultrasonic field detection units, each set including a light-emitting unit and a camera unit disposed opposite to each other on both sides of the container along an optical axis, the optical axis being orthogonal to the axis of the ultrasonic field generated by the ultrasonic generating unit; a rotation mechanism, wherein the at least one set of ultrasonic field detection units can be rotated to multiple different positions around the axis of the ultrasonic field under the action of the rotation mechanism, the light-emitting unit being used to emit detection light at the multiple different positions, and the camera unit being used to correspondingly acquire image information of the detection light after being deflected by the ultrasonic field at the different positions; and a processing unit, which generates a three-dimensional image of the ultrasonic field based on the image information acquired at the multiple different positions.

[0006] For example, at least the inner surface of the top wall of the container is provided with a sound-absorbing component.

[0007] For example, the container includes a bottle body with a top opening and a first cap detachably connected to the opening, wherein a sound-absorbing component is disposed on the lower surface of the first cap.

[0008] For example, the container also includes a second cover detachably connected to the opening, the bottom of which is provided with a hydrophone.

[0009] For example, the sound-absorbing component is detachably connected to the first cover, and the detection device also includes a hydrophone detachably connected to the first cover.

[0010] For example, the ultrasonic field detection unit is in groups of 2n-1, where n is a positive integer greater than 1. The light-emitting units and camera units of adjacent groups of ultrasonic field detection units are arranged alternately in a clockwise direction, and the included angle between the optical axes of any adjacent groups of ultrasonic field detection units is a predetermined value. Multiple different workstations include a first workstation and a second workstation. The second workstation is obtained by rotating the first workstation by a predetermined angle. The ultrasonic field detection units in the group of 2n-1 acquire first image information of the detection light after being deflected by the ultrasonic field at the first workstation. The ultrasonic field detection units in the group of 2n-1 acquire second image information of the detection light after being deflected by the ultrasonic field at the second workstation. The image information includes the first image information and the second image information.

[0011] For example, the time interval between the emission time of the ultrasonic pulse from the ultrasonic emission unit and the acquisition time of the ultrasonic field detection unit is the same.

[0012] For example, at each workstation, 2n-1 groups of ultrasonic field detection units simultaneously acquire image information of the ultrasonic field.

[0013] For example, the container is in the shape of a regular m-sided prism, where m = 4n-2. At the first and second work stations, the optical axes of the ultrasonic field detection units in the 2n-1 group are perpendicular to the side surfaces of the regular m-sided prism.

[0014] For example, the rotating mechanism includes at least one set of guide rail assemblies, and at least one set of ultrasonic field detection units are correspondingly disposed on at least one set of guide rail assemblies. Each set of at least one set of guide rail assemblies includes a first sub-guide rail and a second sub-guide rail. The light-emitting unit of the ultrasonic field detection unit of the corresponding set is movably disposed on the first sub-guide rail, and the camera unit is movably disposed on the second sub-guide rail. Both the first sub-guide rail and the second sub-guide rail are parallel to the optical axis of the ultrasonic field detection unit of the corresponding set.

[0015] For example, for each of at least one set of ultrasonic field detection units: the light-emitting unit includes a light source, a beam expander and a collimator disposed on a first sub-rail, the positions of the light source, the beam expander and the collimator along the first rail are adjustable.

[0016] For example, for each of at least one set of ultrasonic field detection units: the camera unit includes a focusing lens and a camera disposed on a second sub-rail, the position of the focusing lens and the camera along the second sub-rail being adjustable.

[0017] For example, the detection device further includes a calibration component having a physical scale, the calibration component being removably disposed inside the container, the camera unit being used to capture calibration image information of the container having the calibration component and the sound-conducting medium, and the processing unit being used to calibrate the relationship between the physical scale and the number of pixels in the calibration image information to measure the wavelength of the ultrasonic field.

[0018] For example, the container is cylindrical.

[0019] Another aspect of this application provides an ultrasonic emission detection system, comprising: the detection device described above, a container filled with a sound-conducting medium; and an ultrasonic emission unit disposed at a mounting position at the bottom of the container and facing the top of the container.

[0020] Therefore, the above technical solution allows for non-destructive testing of the ultrasonic field emitted by the ultrasonic transmitter, avoiding disturbances caused by invasive methods such as hydrophones, resulting in more accurate test results. Furthermore, by rotating the ultrasonic field detection unit, accurate ultrasonic field images can be generated at a lower cost. The lower part of the container can be fixed, and placing the ultrasonic transmitter unit at the bottom of the container prevents its oscillations from being amplified by the container. Simultaneously, lowering the center of gravity of the ultrasonic transmitter unit makes the overall equipment more stable.

[0021] A series of simplified concepts are introduced in the description of the invention, which will be further explained in detail in the detailed description section. This description is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0022] The advantages and features of the present invention will be described in detail below with reference to the accompanying drawings. Attached Figure Description

[0023] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0024] Figure 1 A schematic diagram of a detection device according to an embodiment of the present invention is shown;

[0025] Figure 2 It shows according to Figure 1 A schematic diagram of the detection device of the illustrated embodiment from another angle;

[0026] Figure 3A schematic diagram of a detection device according to another embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Ultrasonic field detection unit; 11. Light emission unit; 12. Camera unit; 101. Guide rail assembly; 102. Rotation mechanism; 103. Container; 104. Sound absorption assembly; 105. Light source; 106. Beam expander; 107. Collimating lens; 108. Focusing lens; 109. Camera. Detailed Implementation

[0029] In the following description, numerous details are provided to enable a thorough understanding of this application. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the application by way of example only. Furthermore, to avoid confusion with this application, some technical features well-known in the art have not been described in detail.

[0030] Reference Figure 1 and Figure 2 This application provides an ultrasonic field detection device. The detection device may include a container 103 for containing a sound-conducting medium, and the bottom of the container 103 is provided with a mounting position for mounting an ultrasonic emitting unit. The container 103 may be made of a transparent material such as glass or acrylic, and can be used to hold transparent sound-conducting media such as water, oil, or ultrasonic coupling agent. Ultrasonic waves can propagate in the sound-conducting medium, and the sound-conducting medium has a uniform refractive index and is free of air bubbles under normal conditions. The ultrasonic emitting unit includes at least an ultrasonic transducer, and in some embodiments, the ultrasonic transducer and a driving unit are arranged together. The ultrasonic emitting unit can be mounted to the mounting position, and the direction of ultrasonic emission is upward towards the container 103.

[0031] The detection device may further include at least one set of ultrasonic field detection units 10. Each set of ultrasonic field detection units 10 includes a light-emitting unit 11 and an imaging unit 12 arranged opposite each other on both sides of the container 103 along the optical axis, with the optical axis orthogonal to the axis of the ultrasonic field generated by the ultrasonic generating unit. Under the action of ultrasonic waves, the refractive index distribution of the sound-conducting medium is uneven, and the deflection angle of the parallel beam at different positions after passing through the liquid medium is different, forming the convergence and divergence of the beam. The light at the convergence point is brighter, and the light at the divergence point is darker, thus carrying the distribution information of the ultrasonic field. The light-emitting unit 11 includes, but is not limited to, sodium lamps, xenon lamps, lasers, and other optical components that can emit parallel beams. The imaging unit 12 may include sensors capable of high-speed imaging, such as complementary metal-oxide-semiconductor (CMOS) sensors and charge-coupled device (CCD) sensors, for recording the image after the light deflection.

[0032] The detection device may include a rotating mechanism 102, under which at least one set of ultrasonic field detection units 10 can rotate to multiple different positions around the axis of the ultrasonic field. In some embodiments, the rotating mechanism can be driven to rotate by a corresponding angle by, for example, a motor drive mechanism. Specifically, the rotating mechanism 102 may be configured as a disk, and the ultrasonic field detection units 10 may be mounted on the disk. Optionally, the rotating mechanism 102 may also be configured as multiple beams that are separate from each other and intersect at the axis of rotation. The light-emitting unit 11 is used to emit detection light at multiple different positions, and the camera unit 12 is used to correspondingly acquire image information of the detection light after it has been deflected by the ultrasonic field at different positions. Thus, one set of ultrasonic field detection units 10 can be equivalent to multiple ultrasonic field detection units 10 set at multiple different positions to a certain extent, reducing the complexity and cost of the device. The detection device also includes a processing unit, which generates a three-dimensional image of the ultrasonic field based on the image information acquired at multiple different positions. In some embodiments, the processing unit may include a computer system such as a personal computer or a server, or a circuit composed of chips such as microcontrollers, field-programmable gate arrays (FPGAs), and digital signal processing units (DSPs) and their peripheral components. In some embodiments, the processing unit may also include a storage medium and a program stored therein, and the task of generating a three-dimensional image of the ultrasonic field is performed by a computer connected to the storage medium.

[0033] It should be understood that the ultrasonic field forms a three-dimensional structure in the sound-conducting medium. Two-dimensional images of the ultrasonic field can be obtained from different angles, and the three-dimensional image of the ultrasonic field can be inversely derived from these two-dimensional images through algorithmic processing. The generation of the three-dimensional image of the ultrasonic field can be achieved using various existing methods based on two-dimensional images, such as using Radon inverse transform and tomographic reconstruction algorithms for three-dimensional reconstruction of the ultrasonic field.

[0034] For example, shadow imaging technology is used to acquire images generated by an ultrasonic field. Shadow imaging technology is a technique for visualizing ultrasonic fields. The principle is that light rays are deflected in a gradient refractive index field, and the deflected light rays are projected onto a screen (the imaging surface of the camera unit in this application). The deflection of light causes the light rays entering the screen to shift in position, producing an uneven distribution of light intensity (shadow) on the screen.

[0035] Obtaining a 3D image through image information 3D reconstruction begins by calculating the minimum rotation angle and perpendicular distance between a 2D pixel and a 3D point. Then, based on these minimum rotation angles and perpendicular distances, the deflection angle of the 2D pixel relative to the Z-axis is calculated. Next, the specific spatial position is calculated using the conversion formula between the 2D plane and 3D space. Finally, multiple sets of data obtained through the above process are fused together to form a 3D model.

[0036] The above steps include step 1: solving for the value of R,h that minimizes the formula using an algorithm.

[0037] in,

[0038] Where J is the Jacobian matrix, and J(R,h) defines the basis coordinates of a point in the two-dimensional plane in space; R is the radius of rotation, and R is initially set to... T z It is the deflection of a point about the Z-axis, that is, the deflection of a point in space relative to the origin of the coordinate system, R. 33 δ is the partial derivative of the Z-axis with respect to z; h is the perpendicular distance between a point in space and the xoy plane, i.e., the height of the Z-axis, with an initial value of 0; λ is the step radius λ = 100; δ is the confidence region.

[0039]

[0040] Where u is the u-axis, equivalent to the x-axis, u i Its function is to perform partial derivatives of u with respect to the u-axis (or x-axis) along the x, y, and z axes. Multiplying these partial derivatives by X, Y, and Z gives the corresponding increment. v is the v-axis, equivalent to the y-axis. i The function is to perform partial derivatives of v with respect to v along the v-axis (or x-axis) in x, y, and z. Multiplying the partial derivatives by X, Y, and Z gives the corresponding increments. α1, α2, and α3 are the first, second, and third derivatives with respect to the height h, respectively, which are equivalent to the Taylor approximation.

[0041] Following this, proceed to step 2 to find the β value that minimizes the formula:

[0042]

[0043] in,

[0044] Where β is the angle between a point in space and the Z-axis; f c R is the spatial direction cosine matrix; 11 It is the partial derivative of u with respect to x, R 12 It is the partial derivative of the u-axis with respect to the y-axis, R 13 It is the partial derivative of u-axis with respect to z; R 21 It is the partial derivative of the v-axis with respect to x, R 22 It is the partial derivative of the v-axis with respect to y, R 23 It is the partial derivative of the v-axis with respect to z; R 31 It is the partial derivative of the z-axis with respect to x, R 32 It is the partial derivative of the z-axis with respect to y, R 33 It is the partial derivative of the z-axis with respect to z; the aforementioned R 11 ~R 33This is equivalent to the basic volume in the base coordinate system; multiplying the aforementioned partial derivatives by X, Y, Z (or h) gives the corresponding increment; T x T y T z These are the deflection values ​​of rotation around the X, Y, and Z axes, respectively, which represent the deflection of a point in space relative to the origin of the coordinate system.

[0045] Finally, perform step 3, substituting the values ​​of R, h, and β calculated in steps 1 and 2 into the formula:

[0046] X=Rcos(β±iΔθ1)

[0047] Y = Rsin(β ± iΔθ2)

[0048] Z = h

[0049] Where Δθ1 is the angle between a point in space and the x-axis, and Δθ2 is the angle between a point in space and the y-axis.

[0050] The above-described method for generating 3D images can improve the fault tolerance rate and generate more reliable 3D images.

[0051] The generated 3D image can be directly displayed on a monitor or similar device, providing a clear and intuitive demonstration of whether the ultrasonic waves emitted by the ultrasonic transmitting unit meet the requirements, and allowing for timely adjustments. In some embodiments, the generated 3D image can also be stored in a storage medium such as a USB flash drive or hard drive for review after testing.

[0052] Therefore, the above technical solution allows for non-destructive testing of the ultrasonic field emitted by the ultrasonic transmitter, avoiding disturbances caused by invasive testing methods such as hydrophones, resulting in more accurate test results. Furthermore, by rotating the ultrasonic field detection unit 10, accurate ultrasonic field images can be generated at a lower cost. The lower part of the container 103 can be fixed; placing the ultrasonic transmitting unit at the lower part of the container 103 prevents its oscillations from being amplified by the container 103. Simultaneously, lowering the center of gravity of the ultrasonic transmitting unit makes the overall equipment more stable.

[0053] It should be noted that the ultrasonic field can include the following parameters: sound pressure and wavelength of the sound wave. Specifically, the sound pressure level is positively correlated with the brightness of the stripes in the image. In the following text, the relationship between sound pressure and image brightness can be pre-measured when the detection device measures the image, for example, by measuring different sound pressure values ​​using a hydrophone and establishing a functional relationship with the image brightness. Specifically, P = k × L, where P represents sound pressure, L represents brightness, and k is a coefficient between sound pressure and brightness. When image information is acquired only through the camera unit 12, the actual sound pressure value can be inversely deduced using this function. The wavelength of the sound wave is related to the distance between two adjacent bright stripes in the image. By determining the correlation between the physical dimensions in container 103 and the pixel dimensions of the image, the wavelength of the sound wave can be derived from the pixel dimensions corresponding to the distance between two adjacent bright stripes in the image.

[0054] For example, at least the inner surface of the top wall of container 103 is provided with a sound-absorbing component 104. In embodiments where the detected ultrasonic wave has a small divergence angle and only reaches the top wall of container 103, the sound-absorbing component 104 may be provided only on the top wall of container 103; in some embodiments for detecting the divergence pattern of an ultrasonic field, the sound-absorbing component 104 may also be provided on the inner wall of container 103 in areas where the ultrasonic wave may reach. The sound-absorbing component 104 can absorb most of the ultrasonic waves reaching it, preventing the ultrasonic waves from being reflected back to the ultrasonic wave transmitter, causing the ultrasonic waves in the detection optical path to superimpose, resulting in a change in the shape of the detected ultrasonic field.

[0055] Exemplarily, container 103 includes a bottle body with a top opening and a first cap detachably connected to the opening, wherein a sound-absorbing component 104 is disposed on the lower surface of the first cap. The top-opening bottle body facilitates the addition of a sound-conducting medium. By disposing of the sound-absorbing component 104 on the lower surface of the first cap, the sound-absorbing component 104 can reach the appropriate position after the cap is installed, for example, being only partially immersed in the sound-conducting medium, or being fully immersed in the sound-conducting medium with the support of the first cap. In some embodiments, a liquid level line may be marked on container 103. When the sound-conducting medium reaches the liquid level line, installing the first cap allows the sound-conducting medium to be at least partially immersed in the sound-conducting medium, preventing the sound-conducting medium from overflowing due to the sound-absorbing component 104. This simplifies the installation process of the sound-absorbing component 104, prevents the sound-absorbing component 104 from falling to the bottom of container 103, and ensures the correct installation configuration.

[0056] Exemplarily, container 103 may also include a second cover detachably connected to the opening, with a hydrophone disposed at the bottom of the second cover. Thus, when a user needs to measure a physical quantity such as sound pressure, the first cover with the sound-absorbing component 104 can be easily replaced with the second cover with the hydrophone. The position of the hydrophone on the second cover can also be calibrated so that the hydrophone can directly reach the measurement position when the second cover is installed, without the need for recalibration. In some embodiments, the first and second covers may also be provided with an adjustment mechanism, such as a micrometer head, allowing for fine-tuning of the position of the sound-absorbing component 104 or the hydrophone without disassembling the first or second cover when it is installed.

[0057] In some embodiments, sound-absorbing material can be directly inserted into the second cover, which reduces testing costs and simplifies operation.

[0058] In some embodiments, the sound-absorbing component 104 is detachably connected to the first cover, and the detection device further includes a hydrophone detachably connected to the first cover. This allows for the use of only one cover, and for different measurements, only the components mounted on the first cover need to be replaced. This approach is particularly suitable for embodiments with a fine-tuning structure on the first cover, effectively reducing costs.

[0059] For example, the ultrasonic field detection unit 10 is divided into 2n-1 groups, where n is a positive integer greater than 1. Along a clockwise direction, the light-emitting units 11 and imaging units 12 of adjacent groups of ultrasonic field detection units 10 are arranged alternately. Figure 3 As shown, the ultrasonic field detection unit 10 can be 3 groups. In embodiments not shown, the ultrasonic field detection unit 10 can also be a single group of 5, 7, 9, etc.

[0060] Since each ultrasonic field detection unit includes a light-emitting unit 11 and a camera unit 12, which are respectively arranged on both sides of the container 103, if an even number of ultrasonic field detection units are set, a uniform interval cannot be formed between the multiple ultrasonic field detection units. Specifically, if an even number of ultrasonic field detection units are set, such as four sets, rotating one of the ultrasonic field detection units by 90 degrees would cause the last ultrasonic field detection unit to overlap with the first ultrasonic field detection unit and thus cannot be set. It is only possible that at least one set of adjacent ultrasonic field detection units has an angle different from the angle between the other two adjacent ultrasonic field detection units. As described above, when three ultrasonic field detection units are set, the ultrasonic field detection units can be set by rotating 120 degrees based on one of the ultrasonic field detection units. In another embodiment, when five ultrasonic field detection units are set, the ultrasonic field detection units can be set by rotating 72 degrees based on one of the ultrasonic field detection units, and so on. Therefore, by simply rotating the corresponding angle, the area swept by the optical axis of each ultrasonic field detection unit can be 1 / (2n-1)×360 degrees, and the area swept by the optical axis of multiple ultrasonic field detection units can cover the entire container 103.

[0061] Continue to refer to Figure 3Since the ultrasonic field detection unit has two symmetrical parts about the container, the included angle between any two adjacent groups of the three ultrasonic field detection units 10 is 60 degrees. When the first group of ultrasonic field detection units 10 rotates 60 degrees, it is in the original position of the second group of ultrasonic field detection units 10, and the shooting direction is opposite to that of the second group of ultrasonic field detection units originally in that position. When it continues to rotate 60 degrees, it is in the original position of the third group of ultrasonic field detection units 10, and the shooting direction is the same as that of the third group of ultrasonic field detection units originally in that position. In one specific embodiment, the ultrasonic field detection units 10 are set to three groups, and the ultrasonic field detection units 10 can rotate from the initial position by 30 degrees, 60 degrees, and 90 degrees. The three groups of ultrasonic field detection units can uniformly surround the container 103 and take 12 images. In an embodiment equivalent to having only one group of ultrasonic field detection units, one group of ultrasonic field detection units takes one image every 30 degrees of rotation from the initial position until it completes one full rotation. The smaller the rotation angle of the ultrasonic field detection unit 10 each time, the more images can be taken, and the higher the accuracy of the established model. In some exemplary embodiments, the included angle between adjacent ultrasonic field detection units is an integer multiple of the angle of rotation of the ultrasonic field detection unit each time. Specifically, for example, the included angle between adjacent ultrasonic field detection units 10 is 60 degrees. The ultrasonic field detection unit 10 can rotate 10 degrees at a time from its initial position to capture images, up to a rotation of 120 degrees. This results in more uniformly distributed images surrounding the container 103, avoiding distortion of the established model. The ultrasonic detection device designed in this way has a relatively central center of gravity, requiring only a small amount of counterweight or no counterweight at all, resulting in a simple structure. The acquired images are also easier to sort, facilitating subsequent processing.

[0062] For example, the angle between the optical axes of any adjacent groups of ultrasonic field detection units is a predetermined value. Multiple different workstations include a first workstation and a second workstation, where the second workstation is obtained by rotating the first workstation by a predetermined angle. Figure 3 In the illustrated embodiment, the predetermined value is 60 degrees. In the second position, this is equivalent to reversing the imaging directions of the three sets of ultrasonic field detection units. Taking the ultrasonic field detection unit in the horizontal direction in the figure as an example, in the first position, the optical path is from left to right, while in the second position, the optical path of the ultrasonic field detection unit in the horizontal direction is from right to left.

[0063] The 2n-1 group of ultrasonic field detection units acquires the first image information of the detection light after it has been deflected by the ultrasonic field at the first station; the 2n-1 group of ultrasonic field detection units acquires the second image information of the detection light after it has been deflected by the ultrasonic field at the second station. The image information includes the first image information and the second image information. Thus, a total of 4n-2 groups of images can be acquired, which are equivalent to being captured from multiple angles around the container.

[0064] For example, container 103 is shaped like a regular m-sided prism, where m = 4n-2. At the first and second workstations, the optical axes of the 2n-1 groups of ultrasonic field detection units 10 are perpendicular to the sides of the regular m-sided prism. When the light-emitting unit 11 illuminates container 103, refraction at the corners of container 103 can be minimized, thus avoiding image distortion. For example, container 103 is cylindrical. A cylinder can be considered a regular m-sided prism with infinite m. Light entering container 103 may only experience unexpected refraction due to the uneven material of container 103, leading to image distortion by the ultrasonic field detection unit 10. Since the cylindrical container 103 and the sound-conducting medium themselves may form lenses, the optical elements included in the imaging unit 12 can be adjusted accordingly, for example, including the focusing lens 108 mentioned below.

[0065] For example, the interval between the emission time of the ultrasonic pulse from the ultrasonic transmitting unit and the acquisition time of the ultrasonic field detection unit is the same. Since the ultrasonic pulse is ultrasound, it propagates in the sound-conducting medium from the moment of emission. Therefore, when the ultrasonic field detection unit acquires images, different acquisition times may cause the acquired images to differ due to the propagation of ultrasound. For example, in the image acquired at the first moment, a certain position corresponds to the peak of the ultrasound wave in the sound-conducting medium, while in the image acquired at the second moment, the same position corresponds to the trough of the ultrasound wave in the sound-conducting medium. This will lead to distortion of the three-dimensional model obtained by processing the image. Optionally, a delay module can be set between the ultrasonic transmitting unit and the ultrasonic field detection unit. After sending a trigger signal to the ultrasonic field detection unit, a certain delay is made before sending the trigger signal to the ultrasonic field detection unit. After receiving the trigger signal, the ultrasonic transmitting unit first emits an ultrasonic pulse, and then the ultrasonic field detection unit receives the trigger signal and begins acquisition. Optionally, the trigger signals sent to both are simultaneous, and the trigger signal is sent to both each time the ultrasonic field detection unit arrives at the work position.

[0066] Typically, each time an ultrasonic transmitting unit emits an ultrasonic wave, the ultrasonic wave state at the same location in the sound-conducting medium is identical at the same time. Specifically, for example, a peak forms 1 millisecond after each ultrasonic pulse is emitted, at a distance of 1 cm from the ultrasonic transmitting unit. This is related to the response delay of the ultrasonic transmitting unit and the frequency of the ultrasonic wave. However, for the same ultrasonic transmitting unit, the above requirements should be met without changing its position. Since the ultrasonic field detection unit needs to rotate to the second position to acquire image information, the delay during rotation is unavoidable. Therefore, it is impossible for the ultrasonic transmitting unit to acquire all the images required for 3D modeling with just one ultrasonic pulse. To ensure the accuracy of the 3D modeling images as much as possible, in the first position, after the ultrasonic transmitting unit emits an ultrasonic pulse, the ultrasonic field detection unit acquires image information at a first time interval. After the ultrasonic field detection unit rotates to the second position and is in place, the ultrasonic transmitting unit can re-emit an ultrasonic pulse and acquire image information at the same first time interval after starting to emit the ultrasonic pulse. In some specific embodiments, the first time interval can be 0 milliseconds, 1 millisecond, 2 milliseconds, etc. In some embodiments, the ultrasonic field in the sound-conducting medium stabilizes after the ultrasonic transmitting unit emits an ultrasonic pulse for the first time. Therefore, the acquired images can make 3D modeling more accurate.

[0067] For example, at each workstation, 2n-1 groups of ultrasonic field detection units simultaneously acquire ultrasonic field image information. Optionally, the trigger signal lines of the ultrasonic field detection units can be connected together, so that acquisition can begin simultaneously when a trigger signal for acquiring ultrasonic field image information is received. Optionally, each ultrasonic field detection unit can be equipped with a wireless receiver, so that when the transmitter issues an acquisition command, each ultrasonic field detection unit simultaneously receives the start acquisition information and begins acquiring images. This avoids the situation where different ultrasonic field detection units acquire ultrasonic field image information at different times, leading to distortion in the 3D modeling.

[0068] For example, the rotating mechanism 102 includes at least one set of guide rail assemblies 101, and at least one set of ultrasonic field detection units 10 are correspondingly disposed on at least one set of guide rail assemblies 101. Each set of at least one set of guide rail assemblies 101 includes a first sub-guide rail and a second sub-guide rail. The light-emitting unit 11 of the ultrasonic field detection unit 10 of the corresponding set is movably disposed on the first sub-guide rail, and the camera unit 12 is movably disposed on the second sub-guide rail. Both the first sub-guide rail and the second sub-guide rail are parallel to the optical axis of the ultrasonic field detection unit 10 of the corresponding set.

[0069] In some embodiments, a slider may be provided on the guide rail assembly, and the light-emitting unit and the camera unit are disposed on the slider. The slider can slide along the guide rail assembly, causing the light-emitting unit and the camera unit to move along the optical axis. The slider may include a locking element to prevent the positions of the light-emitting unit and the camera unit from moving along the optical axis during the measurement process and during the rotation of the rotating mechanism.

[0070] Because optical systems have strict requirements on the distance between optical elements on the optical axis, taking the camera unit 12 as an example, the distance between the camera unit 12 and the container 103 may affect the imaging effect, such as poor focusing, or scaling or distortion of the captured image. Especially for the cylindrical container 103, the parallel light emitted by the light-emitting unit 11 is converged by the cylindrical container 103 and the sound-conducting medium therein, and the light beam exiting the container 103 is not parallel light. The camera unit 12 needs to maintain a suitable distance to ensure accurate image acquisition. In an exemplary embodiment, the container 103 is fixedly set, and the distance between the light-emitting unit 11, the camera unit 12 and the container 103 can be adjusted by the guide rail assembly 101 to ensure accurate image acquisition. In some embodiments, the guide rail assembly 101 is set directly above or below the container 103 so that it will not contact the container 103 when rotating with the rotating mechanism 102. In other embodiments, the guide rail assembly 101 can be constructed as two segments spaced apart from each other, and the container 103 is disposed in the gap between the two segments of the guide rail assembly 101. In some other embodiments, the guide rail assembly 101 may extend to one side of the container 103. In summary, during the rotation of the rotating mechanism 102, it will not contact the fixed container 103, and the optical axes of the light-emitting unit 11 and the camera unit 12 provided on the guide rail assembly 101 always pass through the container 103, and the distance between the light-emitting unit 11 and the container 103 and the distance between the camera unit 12 and the container 103 remain unchanged.

[0071] When multiple ultrasonic field detection units 10 are set up, by setting up guide rail assemblies 101 for each ultrasonic field detection unit 10, the light-emitting unit 11 and the camera unit 12 of the ultrasonic field detection unit 10 on each guide rail assembly 101 can be independently adjusted. For multiple ultrasonic field detection units 10 using the same light-emitting unit 11 and camera unit 12, by adjusting the positions of the light-emitting unit 11 and camera unit 12, the distance between the light-emitting unit 11 and the container 103 in each group is the same, and the distance between the camera unit 12 and the container 103 is also the same, thereby ensuring that the established three-dimensional model is more accurate. Of course, when there are consistency differences between the light-emitting unit 11 and camera unit 12 in different groups, the distance can be finely adjusted according to the actual situation.

[0072] Exemplarily, for each of at least one group of ultrasonic field detection units 10, the light-emitting unit 11 includes a light source 105, a beam expander 106, and a collimating lens 107 disposed on a first sub-guide rail, the positions of which are adjustable along the first guide rail. As described above, in some embodiments, the first sub-guide rail and the second sub-guide rail (hereinafter referred to as the second sub-guide rail) may be spaced apart with respect to the container 103. In other embodiments, the first and second sub-guide rails may also be interconnected. By changing the distance between the beam expander 106, the collimating lens 107, and the light source 105, the light emitted by the light source 105 can be adjusted to be parallel light of an appropriate size. For multiple groups of ultrasonic field detection units 10, the three can be adjusted so that the parallel light emitted by each group of light-emitting units 11 has the same size, thereby ensuring the accuracy of the three-dimensional modeling.

[0073] For example, for each of at least one set of ultrasonic field detection units 10, the imaging unit 12 includes a focusing lens 108 and a camera 109 disposed on a second sub-guide rail, the positions of which are adjustable along the second sub-guide rail. Similar to the adjustment of the light-emitting unit 11, the adjustment of the focusing lens 108 and the camera 109 can optimize the imaging effect. In embodiments with multiple sets of ultrasonic field detection units 10, each camera 109 can have the same scaling size and optimal imaging effect, reducing the difficulty of post-processing the images.

[0074] Exemplarily, the detection device further includes a calibration component with a physical scale. The calibration component is removably disposed within the container 103. The camera unit 12 is also used to capture calibration image information of the container 103 containing the calibration component and the sound-conducting medium. The processing unit is also used to calibrate the relationship between the physical scale and the number of pixels in the calibration image information to measure the wavelength of the ultrasonic field. In one specific embodiment, the scale is imaged 1:1 on the imaging plane of the camera unit 12. If the pixels on the imaging plane have an interval of, for example, 75 μm, it can be determined that the image interval between two objects in the acquired image is n pixels, and the physical interval between the two objects is n × 75 μm. The image on the imaging plane is generally linear with the actual physical size, thereby enabling the image to correspond one-to-one with the physical size according to the scaling ratio. In embodiments where the scaling ratios differ in different areas of the image, software correction can also be performed. For multiple sets of ultrasonic field detection units 10, the images captured by the camera unit 12 may have different scaling ratios. The position of the camera unit 12 can be adjusted or scaled in the software according to the correspondence between the pixels of each image and the scale size, to ensure that there is no distortion during 3D modeling.

[0075] In some embodiments, the ultrasonic transmitting unit consists of a function generator, a power amplifier, and an ultrasonic transducer. The function generator outputs a specified pulse signal, which is amplified by the power amplifier to excite the ultrasonic transducer to generate ultrasonic waves.

[0076] Another aspect of this application provides an ultrasonic emission testing system, including the aforementioned testing device and an ultrasonic emission unit. The container is filled with a sound-conducting medium, and the ultrasonic emission unit is mounted at a position at the bottom of the container, facing the top of the container. This allows for three-dimensional modeling of the ultrasonic field emitted by the ultrasonic emission unit, providing a more intuitive demonstration of the ultrasonic emission unit's performance.

[0077] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front", "rear", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", and "bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0078] For ease of description, relative terms such as "above," "over," "on the upper surface of," and "above" are used here to describe the regional positional relationship of one or more components or features shown in the figures to other components or features. It should be understood that relative terms include not only the orientation of the component as depicted in the figure but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.

[0079] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0080] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar subjects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0081] This application has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the scope of the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed by this invention. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting ultrasonic fields, characterized in that, include: A container for holding a sound-conducting medium, the bottom of which is provided with a mounting position for installing an ultrasonic transmitting unit; At least one set of ultrasonic field detection units, each set of ultrasonic field detection units includes a light-emitting unit and a camera unit arranged opposite to each other on both sides of the container along an optical axis, the optical axis being orthogonal to the axis of the ultrasonic field generated by the ultrasonic emitting unit; The rotating mechanism allows at least one set of ultrasonic field detection units to rotate around the axis of the ultrasonic field to multiple different positions under the action of the rotating mechanism. The light-emitting unit is used to emit detection light at the multiple different positions, and the camera unit is used to collect image information of the detection light after it has been deflected by the ultrasonic field at the different positions. as well as The processing unit generates a three-dimensional image of the ultrasonic field based on image information acquired at the multiple different workstations.

2. The detection device as described in claim 1, characterized in that, The container has at least one sound-absorbing component on the inner surface of its top wall.

3. The detection device as described in claim 2, characterized in that, The container includes a bottle body with a top opening and a first cap detachably connected to the opening, wherein: The sound-absorbing component is disposed on the lower surface of the first cover.

4. The detection device as described in claim 3, characterized in that, The container also includes a second cover detachably connected to the opening, the bottom of which is provided with a hydrophone; or The sound-absorbing component is detachably connected to the first cover, and the detection device further includes a hydrophone detachably connected to the first cover.

5. The detection device as described in claim 1, characterized in that, The ultrasonic field detection unit consists of 2n-1 groups, where n is a positive integer greater than 1. Along a clockwise direction, the light-emitting units and camera units of the ultrasonic field detection units in adjacent groups are arranged alternately, and the included angle between the optical axes of any adjacent group of ultrasonic field detection units is a predetermined value. The plurality of different workstations include a first workstation and a second workstation, wherein the second workstation is obtained by rotating the first workstation by the predetermined angle. The ultrasonic field detection unit of group 2n-1 acquires first image information of the detection light after it has been deflected by the ultrasonic field at the first station; the ultrasonic field detection unit of group 2n-1 acquires second image information of the detection light after it has been deflected by the ultrasonic field at the second station, the image information including the first image information and the second image information.

6. The detection device as described in claim 5, characterized in that, The time interval between the emission time of the ultrasonic pulse from the ultrasonic emission unit and the acquisition time of the ultrasonic field detection unit is the same.

7. The detection device as described in claim 5, characterized in that, At each workstation, the ultrasonic field detection units in group 2n-1 simultaneously acquire image information of the ultrasonic field.

8. The detection device as described in claim 5, characterized in that, The container is in the shape of a regular m-sided prism, where m = 4n - 2. At the first and second workstations, the optical axis of the ultrasonic field detection unit in group 2n-1 is perpendicular to the side surface of the regular m-sided prism.

9. The detection device as described in claim 1, characterized in that, The rotating mechanism includes at least one set of guide rail assemblies, and the at least one set of ultrasonic field detection units are correspondingly disposed on the at least one set of guide rail assemblies. Each of the at least one set of guide rail assemblies includes a first sub-guide rail and a second sub-guide rail. The light-emitting unit of the ultrasonic field detection unit of the corresponding set is movably disposed on the first sub-guide rail, and the camera unit is movably disposed on the second sub-guide rail. Both the first sub-guide rail and the second sub-guide rail are parallel to the optical axis of the ultrasonic field detection unit of the corresponding set.

10. The detection device as described in claim 9, characterized in that, For each of the at least one group of ultrasonic field detection units: The light-emitting unit includes a light source, a beam expander, and a collimating lens disposed on the first sub-guide rail. The positions of the light source, the beam expander, and the collimating lens along the first sub-guide rail are adjustable; and / or The camera unit includes a focusing lens and a camera mounted on the second sub-rail, and the positions of the focusing lens and the camera along the second sub-rail are adjustable.

11. The detection device as described in claim 1, characterized in that, It also includes a calibration component having a physical scale, the calibration component being removably disposed within the container, the camera unit being further configured to capture calibration image information of the container having the calibration component and the sound-conducting medium, and the processing unit being further configured to calibrate the relationship between the physical scale and the number of pixels in the calibration image information to measure the wavelength of the ultrasonic field.

12. The detection device as described in claim 1, characterized in that, The container is cylindrical.

13. An ultrasonic emission detection system, characterized in that, include: The detection apparatus as described in any one of claims 1-12, wherein the container is filled with a sound-conducting medium; and An ultrasonic emitting unit is disposed at the mounting position at the bottom of the container and placed facing the top of the container.

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