System and method for regulating and controlling sound field by using phased array transducer and passive acoustic structure

Abstract

The invention discloses a sound field regulation and control system and method combining a phased array transducer and a passive acoustic structure, and belongs to the technical field of ultrasonic imaging and treatment. Comprising a phased array transducer for transmitting programmable plane waves; and the passive acoustic super lens is acoustically coupled with the passive acoustic super lens and is detachable. The phased array transducer transmits plane waves at different angles to excite the super lens; the super lens is optimally designed, incident plane waves can be efficiently converted into preset focuses or acoustic potential wells, the energy transmission efficiency is high, and the system is compact in size. According to the invention, a complex physical focusing task is decoupled from an active phased array to a passive super lens, only the phased array is utilized to execute plane wave deflection, and sound field dynamic scanning of sub-wavelength dynamic focusing (the focal spot size can be superior to 0.7 lambda) is realized. According to the method, high-frame-rate dynamic imaging can be achieved, the system is simple in structure and low in cost, and an innovative solution is provided for application such as high-intensity focused ultrasound treatment, real-time imaging and nondestructive testing.

Description

Technical Field

[0001] This invention belongs to the field of acoustic engineering technology, and more specifically, relates to a system and method for sound field modulation using phased array transducers and passive acoustic structures. Background Technology

[0002] In many cutting-edge fields such as medical diagnostics, targeted therapy, and precision industrial inspection, real-time, flexible, and high-precision dynamic control of sound fields is a crucial core technology. For example, in scenarios such as cerebral blood flow monitoring and real-time intraoperative guidance, it is necessary to capture minute dynamic changes with high frame rates and high resolutions; in high-intensity focused ultrasound (HIFU) treatment, it is necessary to dynamically and precisely focus sound energy onto the lesion target under precise imaging guidance. However, existing sound field control technologies generally suffer from inherent contradictions that are difficult to reconcile in simultaneously meeting the three core requirements of dynamic flexibility, spatial accuracy, and system complexity.

[0003] Currently, mainstream sound field manipulation technologies are mainly divided into two categories: electronic scanning technology based on active phased arrays (PAs) and physical wavefront shaping technology based on passive acoustic metamaterials / metasurfaces (AMs). However, both of these technologies have significant inherent drawbacks.

[0004] On the one hand, traditional phased array ultrasound systems face a fundamental trade-off between accuracy and complexity. To avoid grating lobe artifacts that degrade image quality due to spatial aliasing, the element spacing of the phased array must satisfy the Nyquist sampling criterion (typically less than half a wavelength). This physical constraint necessitates the integration of thousands of independent electronic channels to achieve high-resolution imaging with large apertures, resulting in an exponential increase in system hardware cost and electronic complexity, and a bulky size that fails to meet the demands for portability and rapid bedside testing. Even with focused emission technology, its dynamic adjustment capability is limited by the need for preset focus.

[0005] On the other hand, static physical manipulation schemes based on acoustic metasurfaces severely lack dynamic flexibility. While acoustic metasurfaces can achieve precise physical manipulation of the acoustic wavefront with subwavelength accuracy, their function is permanently fixed once the structure is fabricated. This results in extremely long acoustic field mode switching times (typically >10 seconds), making them unsuitable for real-time dynamic tracking of the focal point in applications such as HIFU therapy. Furthermore, existing acoustic tweezers systems often rely on bulky mechanical displacement stages for scanning, further limiting their flexibility and speed in dynamic manipulation.

[0006] In summary, existing technologies suffer from a critical unresolved technical problem: the lack of a sound field control solution that simultaneously achieves high spatial resolution, high-speed dynamic reconfigurability, and a simple, compact system. Traditional phased arrays sacrifice accuracy and cost-effectiveness in pursuit of dynamism; while static metasurfaces sacrifice dynamic flexibility in pursuit of accuracy. In applications requiring coordinated imaging and treatment, such as ultrasound hyperthermia for tumors, existing devices cannot simultaneously achieve precise imaging of lesions and real-time dynamic control of focused sound field energy, leaving a significant technological gap. Therefore, a novel technological paradigm is urgently needed in this field to overcome the inherent limitations of the aforementioned technologies. Summary of the Invention

[0007] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a system and method for sound field modulation using phased array transducers and passive acoustic structures. The aim is to achieve high-resolution focusing at the subwavelength level, high-fidelity dynamic scanning, and the ability to construct complex sound fields simultaneously through an innovative system-level architecture, while maintaining low system cost and low complexity. This solves the core technical problem of existing technologies' difficulty in balancing resolution, dynamics, and system integration.

[0008] To achieve the above objectives, the present invention provides a system for sound field modulation using a phased array transducer and a passive acoustic structure, comprising: a phased array transducer, a passive acoustic superlens, and an intelligent control module; the phased array transducer is used to emit a plane wave, and the passive acoustic superlens is acoustically coupled to the phased array transducer to convert the plane wave into at least one preset focus; the intelligent control module is used to control the deflection angle of the plane wave to drive the at least one predetermined focus to perform non-mechanical scanning in space, thereby realizing dynamic scanning of the focus.

[0009] Preferably, the phased array transducer is a two-dimensional surface array transducer, comprising N×N array elements arranged in an array, wherein N≥5, each element is used to emit a deflectable plane wave, and the spacing between the elements is greater than half of the operating wavelength, so as to reduce the system complexity while maintaining a large aperture.

[0010] Preferably, the passive acoustic superlens is detachably mounted in front of the phased array transducer as its mask structure to support rapid switching of different focal lengths or functions (e.g., 10 mm, 20 mm, 30 mm focal lengths).

[0011] Preferably, the passive acoustic superlens is an amplitude-modulated Fresnel lens. More preferably, the half-wave zone structure of the Fresnel lens is designed using reverse optimization based on genetic algorithm (GA) and finite element simulation (COMSOL) to maximize its energy transfer efficiency.

[0012] Preferably, the passive acoustic superlens is a phase-modulated holographic lens. More preferably, the phase distribution of the holographic lens is generated based on the backpropagation of the target sound field (e.g., a single-focus, multi-focus, or acoustic potential well) or by a computational holographic algorithm.

[0013] The present invention also provides a method for sound field modulation using a phased array transducer and a passive acoustic structure, comprising the following steps: A first plane wave with a first preset deflection angle is emitted, and the first plane wave is converted into a focal point located at a first spatial position; A second plane wave with a second preset deflection angle is emitted from the same position. The second plane wave is converted into a focal point located at a second spatial position. Repeating this step achieves dynamic scanning of the focal point.

[0014] Preferably, the method further includes a step of high frame rate plane wave imaging using the focus of dynamic scanning, wherein a multi-angle (e.g., 30 angles / frame) plane wave emission sequence is generated by an intelligent control module, and the received echo signals are processed in parallel by a graphics processor (GPU) to accelerate image reconstruction, achieving an imaging rate of up to 100 frames / second.

[0015] The present invention also provides an electronic device, comprising: a computer-readable storage medium and a processor; The computer-readable storage medium is used to store executable instructions; The processor is used to read executable instructions stored in the computer-readable storage medium and execute the above-described method.

[0016] The present invention also provides a computer-readable storage medium storing computer instructions for causing a processor to perform the above-described method.

[0017] The present invention also provides a computer program product, including a computer program or instructions that, when executed by a processor, implement the above-described method.

[0018] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly have the following beneficial effects: 1. High-precision dynamic focusing achieved through "physical-electronic" synergy: This invention is the first to combine the physical wavefront modulation capability of a passive superlens with the electronic plane wave deflection capability of an active phased array, forming an innovative "decoupled" mode of "physical focusing + electronic scanning". This mode successfully integrates the subwavelength-level high precision of the superlens (experimentally measured focal spot size is up to 50% smaller than that of traditional phased arrays) with the dynamic flexibility of the phased array, without requiring complex electronic delay control hardware.

[0019] 2. Liberation from Design Constraints, Achieving a Balance Between High Performance and Low Cost: The "decoupled" architecture of this invention fundamentally liberates the design of phased arrays from the Nyquist sampling theorem. It allows the use of sparse arrays with element spacing much greater than half a wavelength to drive the system, thereby reducing the number of array elements and electronic channels required by the system by more than an order of magnitude while maintaining large aperture and high resolution. This significantly reduces the cost and complexity of the system, making it possible to develop compact, portable, high-performance acoustic devices (e.g., with a form factor of less than 10 mm × 10 mm).

[0020] 3. High frame rate, high resolution imaging, and multimodal manipulation capabilities: Combining multi-angle plane wave composite imaging technology with GPU parallel computing, this system can achieve ultra-fast imaging at up to 100 frames per second while maintaining micron-level high resolution (experimentally measured up to 400μm), capturing rapid physiological processes such as cerebral blood flow. Furthermore, by changing different holographic lenses, the system can flexibly switch to various advanced manipulation modes such as multifocal acoustic tweezers or acoustic potential traps, achieving a perfect integration of imaging and multimodal therapy / manipulation functions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall architecture of the sound field dynamic control system provided by the present invention.

[0022] Figure 2 This is a control system logic block diagram of a sound field dynamic control system according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the platform device for experimental verification of the system described in the embodiment of the present invention.

[0024] Figure 4 This is a simulation comparison diagram of the static focusing performance and dynamic scanning capability of the system described in the embodiment of the present invention and a traditional phased array.

[0025] Figure 5 This is a schematic diagram of the experimental results of the system described in this embodiment of the invention performing omnidirectional electron scanning in three-dimensional space.

[0026] Figure 6 This is a schematic diagram showing the results of constructing and dynamically scanning a complex sound field using the system described in this embodiment of the invention.

[0027] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-Phase array transducer, 2-Passive acoustic superlens, 3-Target plane, 4-Intelligent control module, 5-Array element, 6-Fresnel lens, 7-Holographic lens, 8-Programmable ultrasonic platform, 9-Needle hydrophone, 10-3D scanning tank, 11-3D moving platform, 12-Sound field data acquisition card, 13-Sound field data oscilloscope. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0029] This invention provides a system for sound field modulation using a phased array transducer and a passive acoustic structure, comprising: a phased array transducer, a passive acoustic superlens, and an intelligent control module; the phased array transducer is used to emit plane waves, and the passive acoustic superlens is acoustically coupled to the phased array transducer to convert the plane waves into at least one preset focus; the intelligent control module is used to control the deflection angle of the plane waves to drive the at least one predetermined focus to perform non-mechanical scanning in space, thereby realizing dynamic scanning of the focus.

[0030] The present invention also provides a method for sound field modulation using a phased array transducer and a passive acoustic structure, comprising the following steps: A first plane wave with a first preset deflection angle is emitted, and the first plane wave is converted into a focal point located at a first spatial position; A second plane wave with a second preset deflection angle is emitted from the same position. The second plane wave is converted into a focal point located at a second spatial position. Repeating this step achieves dynamic scanning of the focal point.

[0031] Example 1 See Figure 1 This embodiment provides a dynamic sound field control system. Figure 1 The physical structure of the system and the principle of acoustic wave manipulation are demonstrated. Based on a "task decoupling" manipulable plane wave-excited superlens architecture, the system can achieve high-resolution static focusing and high-fidelity dynamic scanning. The system mainly includes a phased array transducer 1, a detachable passive acoustic superlens 2, and an intelligent control module 4.

[0032] In this embodiment, the phased array transducer 1 is specifically a two-dimensional planar array ultrasonic probe, comprising N×N array elements 5. Preferably, it includes a 16×16 high-density array element matrix, with the elements arranged in an array on a flexible polyimide circuit board substrate. Each array element preferably uses a PZT-5H piezoelectric ceramic sheet, with a center operating frequency of 2.5MHz (corresponding to the wavelength in water). λ The element pitch is preferably set to 0.62 mm, with dimensions of 0.5 mm × 0.5 mm. The 256 elements are connected to an integrated circuit via gold wire bonding. This circuit receives drive signals (e.g., drive voltage ±10V, bandwidth 1-3MHz) from the intelligent control module 4. The core function of this phased array transducer 1 is to generate a series of wavefront-normalized plane waves with different deflection angles (e.g., covering -15° to +15°) at an ultrafast transmission rate (e.g., 1000Hz) by precisely controlling the transmission timing (delay) of each element under the command of the intelligent control module 4.

[0033] In this embodiment, the passive acoustic superlens 2 is a detachable mask structure, which can be replaced with lenses of different types or focal lengths according to application requirements. This embodiment provides two preferred superlens solutions: Option 1: Fresnel lens. This lens is an amplitude modulation lens, preferably made of precision-etched stainless steel plate to ensure its structural rigidity and high machining accuracy (<0.1 mm). Its structure consists of multiple concentric rings, and the radius of the m-th ring satisfies:

[0034] Focal length f =5~30 mm, with a rigid surface (acoustic impedance 36.2MRayl, impedance ratio with water 42:1), achieving total internal reflection boundary conditions, and the focused focal spot size can reach 0.8λ. Its acoustic impedance has a huge mismatch with the water body, which can be approximated as a total internal reflection boundary condition. By suppressing the destructive interference waveband, efficient energy focusing is achieved.

[0035] Option 2: Holographic Lens: The holographic lens employs time-domain inversion technology, acoustic holography principles, and phase compensation algorithms. Based on the dispersion characteristics of the acoustic matching layer material, a frequency-phase correction model is established to modulate the propagation path of ultrasonic waves. The focusing focal length of the holographic lens is adjustable within the range of 5–30 mm, and the focal point size is no greater than 0.9 times the working wavelength λ (λ is the wavelength of the acoustic wave in the medium used). Preferably, it is manufactured using high-precision stereolithography 3D printing technology, with the material being an acoustically matched photosensitive resin (red wax, sound velocity approximately 2326 m / s). Its core function is to add a preset phase distribution to the wavefront of the incident plane wave through its microstructure. This phase distribution is generated based on computational holography or backpropagation algorithms; for example, for single-point focusing, its phase distribution... satisfy: By precisely modulating the phase, arbitrary wavefront reconstruction of the sound field can be achieved, such as forming single-focus, multi-focus acoustic tweezers, or acoustic potential wells. This holographic lens, through time-domain inversion design, matches the acoustic impedance differences between different materials to achieve simultaneous modulation of the phase and amplitude of ultrasonic waves. Introducing a holographic lens into the existing structure of multifunctional acoustic devices enables efficient and precise focusing of ultrasonic waves and modulation of multiple sound field modes within a small space, improving the sound field control capability and application flexibility of portable acoustic devices.

[0036] In this embodiment, the function of the intelligent control module 4 is implemented by a programmable ultrasound platform 8 (including a PC-host computer and an FPGA-field-programmable gate array controller, such as a Verasonics Vantage 256). Figure 2 As shown, the platform integrates a host computer (PC) for advanced algorithm computation and user interaction, and a field-programmable gate array (FPGA) controller for generating nanosecond-level precise timing delay signals. The host computer controls the entire system via MATLAB or C / C++ scripts and sends the calculated delay parameters to the FPGA for execution, thereby enabling fully open and independent timing control of 256 channels. Preferably, the platform can work in conjunction with a computing unit integrated with a graphics processing unit (GPU), such as an Nvidia Titan RTX. In imaging mode, this module is responsible for generating multi-angle plane wave emission sequences (e.g., emitting plane waves at 30 angles within the range of -15° to +15° to form one frame of image) and acquiring the received full-aperture echo signals at high speed (e.g., at a sampling rate of 20 MHz). The acquired data is then transmitted to the GPU, where parallel computing capabilities are utilized to perform real-time image reconstruction using algorithms such as coherent plane wave composite imaging.

[0037] Example 2 This embodiment provides a method based on the system described in Embodiment 1, which combines high-resolution focusing with high-frame-rate imaging.

[0038] Step 1: System Calibration. Please refer to [link / reference]. Figure 3 The phased array transducer 1 and the passive acoustic superlens 2 were placed in the three-dimensional scanning water tank 10. The imaging plane was precisely calibrated on the moving platform using a needle hydrophone 9 (model: NH0200; sensor size: diameter 0.2 mm; sensitivity: 55 mV / MPa; frequency response: 1 MHz to 40 MHz).

[0039] Step 2: Dynamic Focus / Control. See also Figure 4The figure shows a simulation comparison between the system of this invention and a traditional phased array. It is clearly shown that the system of this invention (Fresnel lens / holographic lens) significantly outperforms the traditional phased array in both static focusing focal spot size and dynamic scanning fidelity, verifying the superiority of the "physical focusing + electronic scanning" architecture. See also... Figure 5 This figure illustrates the experimental measurement results of the system performing electronic scanning in three-dimensional space. By controlling the deflection of the plane wave, the focal point can achieve a wide-range, high-precision non-mechanical scanning in three-dimensional space, demonstrating the system's excellent dynamic control capabilities. Depending on the application requirements (e.g., HIFU treatment), a passive acoustic superlens 2 with a suitable focal length (e.g., 5–30 mm) is selected and installed. Through the programmable ultrasound platform 8, its built-in intelligent control module 4 controls the phased array transducer 1 to emit a plane wave with a specific deflection angle. The plane wave is converted into a high-intensity focal point by the passive acoustic superlens 2. By changing the deflection angle of the plane wave in real time, non-mechanical dynamic scanning of the focal point can be achieved. Experiments show that at a frequency of 2.5 MHz, the system can achieve subwavelength focusing (focal spot full width at half maximum (FWHM) ≤ 480 μm, approximately 0.7λ). Furthermore, this system also has the ability to construct complex sound fields, as shown in the reference... Figure 6 As shown. By replacing specific holographic lenses, the system can not only form a single focal point, but also generate complex acoustic fields such as multifocal arrays or acoustic potential traps, and dynamically scan them, greatly expanding its application potential in fields such as acoustic tweezers and particle manipulation.

[0040] Step 3: High Frame Rate Imaging. In imaging mode, the intelligent control module 4 drives the phased array transducer 1 to emit a series (e.g., 30) plane waves at high speed from different angles. The system acquires the echo signals received by all array elements and transmits them to the GPU for parallel processing. Through the coherent plane wave composite imaging algorithm, high-resolution, high-contrast B-mode images can be reconstructed in real time, with an imaging frame rate of up to 100 frames per second.

[0041] Step 4: Performance Verification. By arranging targets in a water tank and using a needle-type hydrophone 9 to perform a grating scan of the three-dimensional sound field (e.g., scanning resolution 0.04 mm), the system's focusing resolution (FWHM), energy transfer efficiency, far-field stability, and dynamic scanning accuracy can be quantitatively evaluated. The experimental results are in high agreement with the simulation predictions, fully demonstrating that the system of this invention far surpasses traditional phased arrays in both static and dynamic performance. The transmission parameters were set as follows: the transmission frequency was set to 2.5 MHz (corresponding to a wavelength λ≈0.6 mm in water), and the excitation voltage was 10 V (peak-to-peak).

[0042] Dynamic scanning process: The programmable ultrasound platform 8 automatically calculates the delay of each array element and synchronously emits a series of plane waves with different deflection angles based on the selected lens focal length. For example, it can emit plane waves at 30 angles within one imaging frame, covering an angle range of -15° to +15°, with an angle interval of 1°.

[0043] Data Acquisition and Reconstruction: The 3D moving platform 11 drives the needle hydrophone 9 (with an XYZ step accuracy of 10 μm) to perform spatial sampling (e.g., sampling interval of 0.04 mm) within a preset area (e.g., 20 mm × 20 mm × 20 mm) to capture the spatial distribution of the 3D sound field. The acquired signal is collected by the sound field data acquisition card 12 and the image is reconstructed by the sound field data oscilloscope 13. Preferably, sparse sampling and compressed sensing algorithms can be combined for optimization to improve imaging quality.

[0044] Through the above experimental procedure, the performance data of the system of the present invention were obtained and compared with the prior art, as shown in Table 1 below: Table 1

[0045] Experimental results show that the system described in this invention can significantly enhance the acoustic intensity in the focal region and effectively suppress energy in the non-focusing region. For example, at a focal length of 5 mm, the dynamic focusing achieved by the system of this invention reduces the full width at half maximum (FWHM) of the focal spot by approximately 50% compared to traditional electronic delayed focusing methods, achieving high-resolution subwavelength imaging. This system exhibits excellent energy concentration, imaging stability, and real-time performance, making it suitable for various scenarios such as high-resolution medical imaging, high-intensity focused therapy, and precision industrial inspection.

[0046] To further verify the application potential of this system in complex scenarios, imaging tests were conducted using tissue phantoms.

[0047] Test setup: Place a phantom of human tissue (e.g., a scatterer with a diameter of 1 mm) in water.

[0048] Imaging sequence: Employs a multi-angle plane wave transmission sequence ranging from -15° to +15°, enabling high-speed acquisition of 20 frames of data within 200ms.

[0049] Imaging results: The reconstructed images show clear scatterer boundaries and good resolution. Compared with traditional phased array imaging, side lobes are effectively suppressed, the signal-to-noise ratio is significantly improved, and artifacts are significantly reduced. This demonstrates the significant advantages of the system of this invention in applications requiring simultaneous high-precision imaging and acoustic field manipulation (e.g., imaging-guided HIFU therapy).

[0050] Example 3 The present invention also relates to an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0051] The electronic device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The memory can be used to store computer programs and / or modules. The processor performs various functions of the electronic device by running or executing the computer programs and / or modules stored in the memory, and by accessing data stored in the memory.

[0052] Example 4 The present invention also relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0053] Specifically, the memory may include high-speed random access memory, as well as non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0054] Example 5 This invention provides a computer program product or computer program that includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the steps of the method described in the above embodiments of this invention.

[0055] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. It should be noted that the terms "in one embodiment," "for example," and "again" in this invention are intended to illustrate the invention and are not intended to limit the invention.

[0056] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A system for sound field manipulation using a phased array transducer and a passive acoustic structure, the system comprising: The application relates to a phased array transducer, a passive acoustic superlens and an intelligent control module; the phased array transducer is used for emitting a plane wave, the passive acoustic superlens is used for converting the plane wave into at least one preset focal point, and the intelligent control module is used for controlling the deflection angle of the plane wave and realizing dynamic scanning of the focal point. The phased array transducer comprises N*N array-arranged array elements, wherein N>=5, the phased array transducer controls the emission time sequence of each array element to synthesize and emit a deflectable plane wave.

2. The system of claim 1, wherein, The spacing between each array element and its adjacent array element is greater than half of the working wavelength.

3. The system of claim 2, wherein, The application further relates to a method for realizing dynamic scanning of a focal point, comprising the following steps:

4. The system of claim 1, wherein, The passive acoustic superlens is a Fresnel lens comprising a plurality of concentric ring zone structures, wherein an edge radius of an mth ring zone is satisfies the following relationship: wherein f is the preset focal length, λ is the operating wavelength, and m is a positive integer representing the order of the ring.

5. The system of claim 1, wherein, The passive acoustic superlens is a holographic type lens, and its phase distribution satisfies the following relationship: wherein, f is the preset focal length, λ is the working wavelength, is the lens plane coordinate.

6. A method for sound field manipulation using a phased array transducer and a passive acoustic structure, characterized by, Emitting a first plane wave with a first preset deflection angle, and converting the first plane wave into a focal point located at a first spatial position; Emitting a second plane wave with a second preset deflection angle from the same position, converting the second plane wave into a focal point located at a second spatial position, and repeating the step to realize dynamic scanning of the focal point. The processor executes the computer program to realize the method in claim 6. 7.An electronic device comprising a memory and a processor, the memory storing a computer program, wherein, The computer program is executed by the processor to realize the steps of the method in claim 6.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program or instruction is executed by the processor to realize the steps of the method in claim 6.

9. A computer program product comprising computer programs or instructions, characterized in that, ​

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