The idea of operation in beam-space and coherent subspace method were introduced into acoustic vector array signal processing.
把声压阵的波束域高分辨算法的思想和相干子空间方法的思想引入到声矢量阵列信号处理，在MichaelZoltowsk提出的矢量阵的数学模型的基础上推导出了声矢量阵波束域宽带聚焦MUSIC算法，并作了计算机仿真研究。
For sound pickup, acoustic processing aims at the design of transducers or transducer arrays to achieve a durable directionality (beam steering and width control) as well as noise resistance.
对于拾音，声学处理的目标是设计耐用的指向性及抗噪声换能器或换能器阵列。
Increasing size or frequency of the sound source will lead to that the main lobe of beam become narrow, deputy flap become more, acoustic pressure in the axis become larger and the radiation of sound field become smaller. The influence of product of wave number and sound source size on directivity was discussed, and it was found that the sound field become intense, energy become focused and its directivity become better with the increase of product value. A further analysis on the directivity character of radiation sound field of combination plane arrays of line and rectangular array was carried out on the basis of investigating directivity of round and rectangular piston transducers. Distribution and directivity character of M×N 2×2, 3×3, 3×8 array of line combinations plane arrays and M×N 2×2, 2×6 rectangular combination plane arrays were analyzed respectively. It was found that the more array number, the more complex for the distribution. In the direction of the more array number will make sidelobe suppression, the main lobe relatively prominent and energy more concentrated. The influence of liquid/solid interface on sound field distribution has been discussed, taking the water/steel interface for example, and it was found that the acoustic pressure in the solid will increase when the wave propagates from the small acoustic impendence medium to the large one.
对直径为10mm、20mm、50mm和发射频率为1MHz、2MHz、5MHz的圆形活塞换能器声场声压分布进行比较，发现频率不变声源尺寸增大或声源尺寸不变频率增大，声束的主瓣都会变窄，辐射范围缩小，副瓣增多，轴线上声压增高；对波数与声源尺寸的乘积对指向性的影响进行讨论，发现随着乘积数值的增大其声场变得尖锐，能量集中，指向性变好；在对圆形活塞换能器和矩形活塞换能器声场声压分布及指向性进行分析的基础上，进一步分析线列阵组合平面阵和矩形阵组合平面阵辐射声场的指向性特征，分别对M×N为2×2、3×3、3×8的线列阵组合平面阵和M×N为2×2、2×6的矩形阵组合平面阵的指向性分布特征进行分析，得到阵元个数及排列对指向性分布的影响规律为：阵元个数越多，指向性分布越复杂，M和N不等的阵列上阵元数较多的方向旁瓣会得到相应的抑制，主瓣比较突出；以水/钢界面为例对液/固界面对声压分布的影响进行讨论，得到声波从声阻抗较小的液体入射到声阻抗较大的固体中声压会突然变大，增大的幅度取决于透射系数。
C permanent magnet field as used as receiving coil and the acoustic field of electromagnetic ultrasound, excited by a beam coil, is measured.
目前 ，电磁超声换能器可以象传统的压电超声换能器一样，在金属件中产生纵波、横波、表面波和板波，用来检查材料中的缺陷。
The reference reflector used for ferritic steel tube, as well as configuration and reflector of the calibration block shall be as per Figure T-434.3, with the calibration block being a portion of a tube with identical nominal dimensions and manufacturing process, and the block size and reflector position allowing for calibrations on the acoustic beam angles applied.
用于铁素体钢管的基准反射体，校准试块的结构和反射体应按图 T-434.3，校准试块应为具有相同标称尺寸和制造工艺管子的一部分，试块的大小和反射体位置应足以对使用的声束角度做出校准。
Al. was studied. Influences of parameters such as pump laser (including beam radius, wavelength, intensity, energy, pulseduration, interaction time et. al.), focusing and material were studied to get high fidelity of phase conjugation and energy reflectivity. It was investigated in two states:intensely transient for short interaction time and quasi-stable state for long interaction time which was longer than five times of decay time of acoustic wave.
三维数值模拟也针对以上提到的各种LSBS发生器、放大器进行了研究，数值模拟中通过改变泵浦光的脉冲长度形成了强瞬态(泵浦光脉冲与声子寿命相比拟)和准稳态(泵浦光脉冲大于声子寿命的5倍)，针对这两种情况探讨了泵浦光参数、聚焦参数、材料参数对LSBS散射光场时空分布、散射光能量提取效率、相位共轭保真度的影响规律。
The shape and size of transducers, array geometry and excitation delay of source array and the shifting time of acoustic signals received by receiver array affect the efficiency of acoustic beam steering in acoustic logging.
在声波测井中声束导向的效率除受换能器的几何参数及阵列声波发射单元的激励延迟时间或阵列接收器接收的各道声波信号偏移时间的影响外，还受换能器的形状和尺寸的影响。
This paper presents a novel electronic equipment with which laser beam stability excelling 0.5% can be obtained, and its output noise in comparision with that obtained with an ordinary stabilized current power source can be reduced by about 20 dB in the acoustic frequency range.
本文介绍了一种新型电子学装置，它可以使小功率He-Ne激光器输出功率稳定度达到0.5%，在声频范围的噪声与通常稳流电源相比，可降低20dB。
After a great deal of numerical simulation and experiment, the effectiveness of this combination method and its superiority to Acoustic holography and beam-forming method were verified.
经过大量的数值仿真和实验，验证了组合方法的有效性和它相对于波束形成方法与声全息方法的优越性。
Equivalent beam's dynamic deflection explanation for abnormal indication in acoustic impedance inspection of the small pits on metal surface of honeycomb adhesive bonded structure
金属胶接蜂窝结构面板上小凹坑处声阻探伤指示异常的等效梁动变位解释
There are several ways of estimating direction of arrival in use of the vector hydrophone: acoustic intensity detection, beam revolving and vector equations.
利用矢量水听器进行方位估计的方法主要有声强检测、旋转波束和矢量方程组等。
Acoustic waves generated in a hollow cylinder by a laser line source with a beam width and a time duration
有束宽和时宽的激光线源在圆管中激发的声波
The boundary element theory together with optimization method is used to calculate the vibration velocity weighting vector of a complicated conformal array of underwater acoustic projecting transducers for an expected beam pattern.
用边界元理论结合优化方法计算了水声发射换能器共形阵在期望辐射方向性下的振速加权向量，提出了振速的2种加权方式，并给出了计算实例。
Reactive ion beam etching technique has been effectively used to study and fabricate large-scale and ultra large scale integrated circuit, acoustic surface wave device, magnetic bubble device microwave device, integrated optical circuit, superconducting device, shimmer optical pattern etc.
反应离子束刻蚀技术已有效地用于研究和制造大规模和超大规模集成电路，声表面波器件，磁泡存储器，微波器件，集成光路，超导器件，闪烁光栅等。
The radiation directivity of a complicated conformal array of underwater acoustic transducers is presented based on the boundary element method. It includes the element directivity of each transducer, the natural beam pattern and the controlled beam pattern of the transducer array.
用边界元方法，给出了水声发射换能器共形阵各阵元的单元指向性以及基阵的自然波束指向性和束控波束指向性。
According to the characteristics of array acoustic sensing unit and the voiceband, it designs the structure of sensor unit in the form of micro-cantilever beam, establishes the vibration mechanics model of micro-cantilever beam and the coupling equation of strain resistance.
根据声阵列传感单元的特性和嗓音频率的范围，设计出微悬臂梁形式的阵列传感单元结构，建立微悬臂梁振动力学模型以及与应变电阻的耦合方程。
Blind beam-forming for broadband underwater acoustic signal
基于频域分解的水声信号宽带盲波束形成
The underwater acoustic signal can cause surface wave motion at water-air interface and modulate the magnitude of the laser beam falling on the water surface.
水下声信号在水-空气界面会引起表面波动而对打在水表面处的激光束进行幅度调制。
Depending on the transducer configuration, the geometry of the acoustic beam, and the route of device entry, either a small portion of the device may be visible as an echogenic focus, or, if the device entry is aligned with the acoustic beam and nearly perpendicular to it, the entire device may be visible.
装置的一个小部分可能发生回波聚焦而可见，或者当装置的进入与声束平行或几乎垂直时，整个装置都可见，这取决于探头的结构、声波的几何学特性和装置的进入。
The scanning and focusing of acoustic beam in solid by a Fresnel transducer array of planar structure is significant in many applications.
用固体表面上的菲涅耳换能器阵实现固体中声束的聚焦和扫描，它具有实用意义。本文将分别运用标量和矢量理论，分析菲涅耳阵在固体中产生的声束特性。