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Phase-Dislocation-Mediated High-Dimensional Fractional Acoustic-Vortex Communication

Research 2024年第3期2023卷 575-584页

作者： Ruijie Cao Gepu Guo Wei Yue Yang Huang Xinpeng Li Chengzhi Kai Yuzhi Li Juan Tu Dong Zhang Peng Xi Qingyu Ma School of Computer and Electronic Information Nanjing Normal UniversityNanjing 210023China Department of Biomedical Engineering College of Future TechnologyPeking UniversityBeijing 100871China nstitute of Acoustics Nanjing UniversityNanjng 210093China National Biomedical Imaging Center Peking UniversityBeijing 100871China

With unlimited topological modes in mathematics,the fractional orbital angular momentum(FOAM)demonstrates the potential to infinitely increase the channel capacity in acoustic-vortex(AV)***,the accuracy and stability of FOAM recognition are still limited by the nonorthogonality and poor anti-interference of fractional AV *** popular machine learning,widely used in optics based on large datasets of images,does not work in acoustics because of the huge engineering of the 2-dimensional point-by-point ***,we report a strategy of phase-dislocation-mediated high-dimensional fractional AV communication based on pair-FOAM multiplexing,circular sparse sampling,and machine *** unique phase dislocation corresponding to the topological charge provides important physical guidance to recognize FOAMs and reduce sampling points from theory to practice.A straightforward convolutional neural network considering turbulence and misalignment is further constructed to achieve the stable and accurate communication without involving experimental *** experimentally present that the 32-point dual-ring sampling can realize the 10-bit information transmission in a limited topological charge scope from±0.6 to±2.4 with the FOAM resolution of 0.2,which greatly reduce the divergence in AV *** infinitely expanded channel capacity is further verified by the improved FOAM resolution of *** with other milestone works,our strategy reaches 3-fold OAM utilization,4-fold information level,and 5-fold OAM *** of the extra advantages of high dimension,high speed,and low divergence,this technology may shed light on the next-generation AV communication.

关键词： infinitely topological fractional

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基于轨道角动量谱分解的多通道水声通信及系统实现

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南京师大学报（自然科学版） 2024年第1期47卷 103-110页

作者：开诚治刘天颀王青东李禹志郭各朴马青玉南京师范大学计算机与电子信息学院/人工智能学院江苏南京210023 山东科技大学海洋工程学院山东青岛266590

水声通信能够实现信息的长距离传输,在深海探索和军事领域发挥重要作用.然而,由于换能器带宽和声波波长的影响,水声通信的发展与应用受到传输衰减大和信道容量低以及频谱利用率不足的限制.本文结合复用涡旋声束(AV)和轨道角动量(OAM)谱... 详细信息

水声通信能够实现信息的长距离传输,在深海探索和军事领域发挥重要作用.然而,由于换能器带宽和声波波长的影响,水声通信的发展与应用受到传输衰减大和信道容量低以及频谱利用率不足的限制.本文结合复用涡旋声束(AV)和轨道角动量(OAM)谱分解技术,研究了基于环形收发阵列的多通道水声通信方法,并系统实现.基于发送数据的ASCII编码,利用全息信号的幅度和相位调制,驱动环形换能器阵列发射沿轴传输的多通道OAM复用涡旋声束,并通过环形换能器阵列的信号采样和OAM谱分解完成复用涡旋声束的OAM模态解码,实现了高效的并行数据传输.构建了8声源环形收发阵列和全息相控系统,开展了6通道水声通信研究,成功实现了复用涡旋声场的实验测量和OAM解码,并与传统单通道二进制串行数据通信进行性能比较.理论和实验结果证明,基于OAM谱分解的通信通道数由发射阵列的阵元数N决定,其解码精度由发射信号的相位精度和接收阵列的阵元数决定;阵元数N≥1的大阵列系统在满OAM模式复用条件下的传输速率约为传统水声通信的N倍.本研究表明基于OAM谱分解的多通道通信可大幅提高信道容量和频谱利用率,为其在水声通信中的实际应用提供了一种实用方案.

关键词：多通道水声通信轨道角动量复用环形收发阵列全息信号谱分解

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聚焦换能器声场特性的快速检验方法

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南京师范大学学报（工程技术版） 2024年第2期24卷 20-27,49页

作者：马蕊生李文溢胡济民李禹志郭各朴马青玉南京师范大学计算机与电子信息学院江苏南京210023 江苏省医疗器械检验所江苏南京210019

高强度聚焦超声(HIFU)已在无创肿瘤治疗方面展示出巨大的应用潜力,而换能器聚焦性能的优劣对疗效起到至关重要的作用,因此声场的精确测量成为实际应用的重要保障.由于加工工艺和安装精度的限制,聚焦换能器的实际声场和理想声场可能存在... 详细信息

高强度聚焦超声(HIFU)已在无创肿瘤治疗方面展示出巨大的应用潜力,而换能器聚焦性能的优劣对疗效起到至关重要的作用,因此声场的精确测量成为实际应用的重要保障.由于加工工艺和安装精度的限制,聚焦换能器的实际声场和理想声场可能存在一定偏差.针对传统三维扫描测量存在速度慢和精度低的问题,提出了一种基于双平面双精度测量的聚焦换能器声场特性快速检验方法.通过沿理想z轴的高精度一维扫描确定换能器倾斜角范围,在声压极值点所在横截面内利用低精度和高精度变邻域搜索法实现最大声压点的精准定位,进一步通过焦域内双平面最大声压点构建声场的实际轴线,完成实际声场焦点的精确定位,最后基于实际焦平面内轴向与径向的高精度测量结果,计算获得焦域尺寸、旁瓣大小、分布对称性和声功率等性能参数.利用构建的声场扫描实验系统对聚焦换能器声场进行三维扫描和快速测量,结果表明在相同的测量精度(0.1 mm)下可以有效提高测量速度百倍以上,具有测量速度快、测量精度易于调节和性能分析全面等优点.方法为聚焦换能器检验提供一种高精度的快速声场测量新技术,在超声治疗仪器的检验中具有重要的指导意义与应用价值.

关键词：聚焦换能器声场双平面双精度测量变邻域搜索法性能参数

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Pulling force of acoustic-vortex beams on centered elastic spheres based on the annular transducer model

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Chinese Physics B 2020年第5期29卷 318-325页

作者： Yuzhi Li Qingdong Wang Gepu Guo Hongyan Chu Qingyu Ma Juan Tu Dong Zhang School of Physics and Technology Nanjing Normal UniversityNanjing 210023China College of Ocean Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Institute of Acoustics Nanjing UniversityNanjing 210093China

To solve the difficulty of generating an ideal Bessel beam,an simplified annular transducer model is proposed to study the axial acoustic radiation force(ARF)and the corresponding negative ARF(pulling force)exerted on centered elastic spheres for acoustic-vortex(AV)beams of arbitrary *** on the theory of acoustic scattering,the axial distributions of the velocity potential and the ARF for AV beams of different orders generated by the annular transducers with different physical sizes are *** is proved that the pulling force can be generated by AV beams of arbitrary orders with multiple axial *** pulling force is more likely to exert on the sphere with a smaller k0a(product of the wave number and the radius)for the AV beam with a bigger topological charge due to the strengthened off-axis acoustic *** pulling force decreases with the increase of the axial distance for the sphere with a bigger *** pulling force areas with wider axial regions can be formed by AV beams using a bigger-sized annular *** theoretical results demonstrate the feasibility of generating the pulling force along the axes of AV beams using the experimentally applicable circular array of planar transducers,and suggest application potentials for multi-position stable object manipulations in biomedical engineering.

关键词： acoustic radiation force pulling force acoustic-vortex beams annular transducer model acoustic scattering

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Beam alignments based on the spectrum decomposition of orbital angular momentums for acoustic-vortex communications

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Chinese Physics B 2022年第12期31卷 296-304页

作者： Gepu Guo Xinjia Li Qingdong Wang Yuzhi Li Qingyu Ma Juan Tu Dong Zhang School of Computer and Electronic Information Nanjing Normal UniversityNanjing 210023China Haiying Enterprise Group Co. Ltd.Wuxi 214061China College of Ocean Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Institute of Acoustics Nanjing UniversityNanjing 210093China

Given the enhanced channel capacity of wave chirality,acoustic communications based on the orbital angular momentum(OAM)of acoustic-vortex(AV)beams are of significant interest for underwater data ***,the stringent beam alignment is required for the coaxial arrangement of transceiver arrays to ensure the accuracy and reliability of OAM *** avoid the required multiple measurements of the traditional orthogonality based algorithm,the beam alignment algorithm based on the OAM spectrum decomposition is proposed for AV communications by using simplified *** studies of the single-OAM and OAM-multiplexed AV beams show that the error of the OAM spectrum increases with the translation distance and the deflection angle of the transceiver *** achieve an ideal arrangement,two methods of the single-array translation alignment and the dual-array deflection alignment are developed based on the least standard deviation of the OAM spectrum(SD-OAM).By decreasing the SD-OAM towards zero using transceiver arrays of 16 transmitters and 16 receivers,accurate beam alignments are accomplished by multiple adjustments in three *** proposed method is also demonstrated by experimental measurements of the OAM dispersion and the SD-OAM for misaligned *** results demonstrate the feasibility of the rapid beam alignment based on the OAM spectrum decomposition by using simplified transceiver ring-arrays,and suggest more application potentials for acoustic communications.

关键词： acoustic-vortex beam beam alignment orbital angular momentum(OAM)spectrum least standard deviation acoustic communication

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Second harmonic magnetoacoustic responses of magnetic nanoparticles in magnetoacoustic tomography with magnetic induction

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Chinese Physics B 2020年第3期29卷 259-264页

作者： Gepu Guo Ya Gao Yuzhi Li Qingyu Ma Juan Tu Dong Zhang School of Physics and Technology Nanjing Normal UniversityNanjing 210023China Institute of Acoustics Nanjing UniversityNanjing 210093China

Due to the unique magnetic, mechanical and thermal properties, magnetic nanoparticles(MNPs) have comprehensive applications as the contrast and therapeutic agents in biomedical imaging and magnetic hyperthermia. The linear and nonlinear magnetoacoustic responses determined by the magnetic properties of MNPs have attracted more and more attention in biomedical engineering. By considering the relaxation time of MNPs, we derive the formulae of second harmonic magnetoacoustic responses(2H-MARs) for a cylindrical MNP solution model based on the mechanical oscillations of MNPs in magnetoacoustic tomography with magnetic induction(MAT-MI). It is proved that only the second harmonic magnetoacoustic oscillations can be generated by MNPs under an alternating magnetic excitation. The acoustic pressure of the 2H-MAR is proportional to the square of the magnetic field intensity and exhibits a linear increase with the concentration of MNPs. Numerical simulations of the 2H-MAR are confirmed by the experimental measurements for various magnetic field intensities and solution concentrations using a laser vibrometer. The favorable results demonstrate the feasibility of the harmonic measurements without the fundamental interference of the electromagnetic excitation, and suggest a new harmonic imaging strategy of MAT-MI for MNPs with enhanced spatial resolution and improved signal-to-noise ratio in biomedical applications.

关键词： magnetoacoustic tomography with magnetic induction second harmonic magnetoacoustic responses magnetic nanoparticles magnetic force mechanical oscillations

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Weak-focused acoustic vortex generated by a focused ring array of planar transducers and its application in large-scale rotational object manipulation

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Chinese Physics B 2021年第4期30卷 319-327页

作者： Yuzhi Li Peixia Li Ning Ding Gepu Guo Qingyu Ma Juan Tu Dong Zhang School of Computer and Electronic Information/School of Artificial Intelligence Nanjing Normal UniversityNanjing 210023China Institute of Acoustics Nanjing UniversityNanjing 210093China

Contactless manipulation of multi-scale objects using the acoustic vortex(AV) tweezers offers tremendous perspectives in biomedical ***,it is still hindered by the weak acoustic radiation force(ARF) and torque(ART)around the vortex *** introducing the elevation angle to the planar transducers of an N-element ring array,the weakfocused acoustic vortex(WFAV) composed of a main-AV and N paraxial-AVs is constructed to conduct a large-scale object *** from the traditional focused AV(FAV) generated by a ring array of concave spherical transducers,a much larger focal region of the WFAV is generated by the main lobes of the planar transducers with the size inversely associated with the elevation *** the pressure simulation of the acoustic field,the capability of the rotational object driving in the focal plane for the WFAV is analyzed using the ARF and the ART exerted on an elastic ball based on acoustic *** the experimental system built in water,the generation of the WFAV is verified by the scanning measurements of the acoustic field and the capability of object manipulation is also analyzed by the rotational trapping of floating particles in the focal *** favorable results demonstrate the feasibility of large-scale rotational manipulation of objects with a strengthened ART and a reduced acousto-thermal damage to biological tissues,showing a promising prospect for potential applications in clinical practice.

关键词： acoustic vortex weak-focused large-scale object manipulation acoustic scatter acoustic radiation force

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基于粒子群算法的超振荡超分辨聚焦声场设计

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物理学报 2022年第20期71卷 158-167页

作者：李鑫鹏曹睿杰李铭郭各朴李禹志马青玉南京师范大学计算机与电子信息学院南京210023

针对传统声束的衍射极限问题,如何构建具有更高分辨率的聚焦声场,是实现超分辨声成像和声操控领域的重大挑战之一.本文在考虑成像分辨率同时兼顾声场可控制性,提出了一种基于粒子群优化算法的多频超振荡超分辨聚焦声场设计方法.基于常... 详细信息

针对传统声束的衍射极限问题,如何构建具有更高分辨率的聚焦声场,是实现超分辨声成像和声操控领域的重大挑战之一.本文在考虑成像分辨率同时兼顾声场可控制性,提出了一种基于粒子群优化算法的多频超振荡超分辨聚焦声场设计方法.基于常规换能器声场的衍射效应,利用半波带法设计中心频率菲涅耳透镜,并以中心频率为基准在换能器带宽范围内设置多频信号来构建超振荡声场,进一步通过粒子群算法对多频声束的振幅和相位进行优化,在远场构建了焦域半径能够小于中心频率半波长的超振荡声场,还发现其尺寸小于最高频率声场的所形成焦域半径,进一步证明其焦域半径随着中心频率和超振荡频率数的增大而减小.研究结果为可控超分辨声聚焦提供了一种简便易行的方法.

关键词：超分辨声聚焦超振荡粒子群算法菲涅耳透镜

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Sinusoid-Golay编码单脉冲激励提升磁声电成像精度

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声学学报 2023年第6期48卷 1208-1217页

作者：李培霞卢振陈伟孙晓冬郭余庆郭各朴马青玉南京师范大学计算机与电子信息学院南京210023 中科芯集成电路有限公司无锡214000 江苏能建机电实业集团有限公司泰州225327

针对低电导率生物组织的成像需求,利用Sinusoid-Golay编码单脉冲激励提高磁声电信号的信噪比和定位精度,实现了高精度的磁声电成像。首先,在考虑换能器指向性的基础上,推导了Sinusoid-Golay编码单脉冲激励的磁声电理论公式,并引入激励... 详细信息

针对低电导率生物组织的成像需求,利用Sinusoid-Golay编码单脉冲激励提高磁声电信号的信噪比和定位精度,实现了高精度的磁声电成像。首先,在考虑换能器指向性的基础上,推导了Sinusoid-Golay编码单脉冲激励的磁声电理论公式,并引入激励转换因子和自相关计算,实现磁声电信号测量和解码重建,理论证明了N位Sinusoid-Golay编码可以将磁声电信号的主瓣幅度提高2N倍,并具有良好的脉冲压缩和噪声抑制能力。然后,在5 dB信噪比条件下,模拟了16位Sinusoid-Golay编码单脉冲激励层状组织模型所产生的磁声电信号,通过匹配滤波解码和叠加增强了磁声电信号的主瓣,并消除了其旁瓣,实现了组织边界的精确定位和电导率梯度的准确重建。最后,搭建了磁声电检测和线性扫描成像系统,利用正弦单周期和16位Sinusoid-Golay编码单脉冲激励,对三层凝胶仿体进行了磁声电测量和图像重建。Sinusoid-Golay编码单脉冲激励能够提高磁声电信号的信噪比约6.5 dB,并精确重构了组织边界电导率变化的幅值和极性。该研究为基于电学特性差异的组织病变早期检测提供了一种高精度磁声电快速成像方法。

关键词：磁声电成像 Sinusoid-Golay编码脉冲激励激励转换因子匹配滤波信噪比

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宽带D类超声功率放大器的设计与实现

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南京师范大学学报（工程技术版） 2020年第1期20卷 25-32页

作者：何建桥李禹志郭各朴马青玉丁鹤平南京师范大学物理科学与技术学院

为了解决大阵列相控的功率、效率及散热问题,促进相控声场的非接触物体操控及其在医学超声中的实际应用,设计了一种PWM型D类超声宽带功率放大器.对阻性和抗性负载的输出波形开展谐波失真、负载电压和输出功率的测量结果表明:该电路可对2... 详细信息

为了解决大阵列相控的功率、效率及散热问题,促进相控声场的非接触物体操控及其在医学超声中的实际应用,设计了一种PWM型D类超声宽带功率放大器.对阻性和抗性负载的输出波形开展谐波失真、负载电压和输出功率的测量结果表明:该电路可对20~400 kHz的中低频超声输入信号进行功率放大,其最大输出功率可达46 W,效率超过78%.该电路具有输出内阻小、阻抗匹配简单、相位保持度高、功率损耗低和发热小的优点,可为超声技术在生物医学中的应用提供电路基础,实现大规模相控阵列的精确驱动,具有良好的推广价值.

关键词：功率放大器宽带 D类 PWM型超声换能器

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