Acoustic emission investigation on surface quality of magnetic recording disk and mechanical performance of magnetic head

It has put forward a imaging method of acoustic lens using photoacoustic signal and according to the Kirchhoff diffraction theory we deduced pulse response of acoustic lens.

光声信号声透镜层析成像方法的提出，并依基耳霍夫衍射理论推导了声透镜的脉冲响应。

By using complex amplitude to describe sound field distributing, acoustic lens pulse response is deduced in theory, and function imaging of biological tissue is obtained.

以声场复振幅来描述声场分布，根据基尔霍夫衍射理论，从理论上推导了声透镜的脉冲响应，并通过实验得到了生物组织的功能成像。

Al. had got 3-D real-time optoacoustic image with much higher optical contrast and ultrasonic resolution by using an acoustic lens system and CCD system.

Frenz等人也利用声透镜结合CCD成像方法实现了对光声信号的实时三维成像，并且获得的光声图像对比度和灵敏度都比较高。

Acoustic lens designing is a key technology on lens imaging sonar. Firstly the paper introduces the design principle of the lens in detail.

透镜设计是透镜成像的关键技术，本文系统介绍了声透镜的设计原理。

Rayleigh-Sommerfeld Diffraction Formula on the Thin Acoustic Lens With Larger Aperture

较大孔径薄声透镜声场的瑞利&索末菲衍射公式

Simulation research on acoustic lens beamforming

声透镜波束形成技术仿真研究

Studies on Acoustic Lens Imaging of Photoacoustic Signal

光声信号的声透镜层析成像研究

Now, focus transducers have three kinds of types: Focus transducer, acoustic lens, phased array focusing system.

到目前为止可以实现聚焦的换能器有三种类型：聚焦换能器、声透镜、相控阵聚焦系统。

Many ultrasonic treatment systems produced by The Chongqing HIFU Company are acoustic lens focus system.

重庆海扶公司生产的许多超声治疗系统，都采用的是声透镜聚焦系统。

It was experimentally proved for the first time that the maximum acoustic power output can be transferred to the load when the acoustic resistance of RC load equals to its acoustic capacitance impedance.

首次通过实验验证了当声阻与容抗相等时，热声发动机向阻容负载传递的声功率最大。

Under cycling loading, rock damage and AE events in unload phase is increasing more quickly than load phase with load increasing. The Y value of acoustic emission load/ unload ratio descending gradually.

随着载荷的增加，岩石在卸载过程中的损伤和声发射事件较加载过程增加更快，声发射数加卸载响应比Y值逐渐减低。

The Y value of acoustic emission load/ unload ratio descend to 1 when rock reach final elastic deformation can be seen as precursory characteristic for rock failure.

声发射数加卸载响应比在岩石弹性变形阶段后期下降到1，可以作为岩石失稳破坏的前兆。

Some parameter of linear compressor, such as moving mass, spring stiffness, working frequency and acoustic load, are investigated in detail in numerical analysis, and it provides some guidelines for designing an efficient linear compressor.

在数值计算方面细致地考察了线性压缩机各参数，如动质量、弹簧刚度、频率响应以及声学负载等参数的影响，为实际模型的设计提供了参考。

The working frequency of a thermoacoustic engine has effect on the matching mode of engine with the acoustic load.

热声发动机工作频率关系到与负载的匹配情况，是热声发动机声能输出的重要评价指标。

Investigation on Fast Reconstructing Reflection Coefficient from Big Acoustic Material Samples by NAH

声学材料大样声反射系数声全息快速反演方法研究

Rubber is an important underwater acoustic material.

橡胶是一种重要的水声学材料。

A Research on the Acoustic Material Based Polyurethane Hybrid Composite Foam

聚氨酯杂化复合泡沫体声学材料的研究

Primary Study of Bending Resonance Test Method of Acoustic Material Damping Property

声学材料阻尼性能弯曲共振试验方法初探

First of all, design of acoustic material.

第一，声学材料的设计。

So, it is important to do research on the acoustic material.

因此吸声材料和结构的研究对噪声控制具有重要意义。