Development of fundamental technique of nonlinear ultrasound phased array system for estimation of aging structure

非线性超声相控阵系统老化结构估计基础技术的发展

基本信息

批准号：
18360343
负责人：
MIHARA Tsuyoshi
金额：
$ 9.5万
依托单位：
University of Toyama (2007)Tohoku University (2006)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360343/
关键词：
Phased Array Nonlinear Ultrasound PMN-PT Aluminum Alloy Crack Subharmonic Wave Photoelasticity Array Design SUS316 MEMS

项目摘要

After the analysis of sound field of a phased array probe, the conventional nonlinear ultrasonic wave system and the commercial phased array system were combined for ultrasonic imaging using aperture synthesis technique. Then, in order to verify the validity of piezo-electric elements of LiNbO3, PMN-PT, PZT and PbTiO3, we fabricate ultrasonic transducers using above elements and estimate the efficiency of each element systematically. Consequently, other three elements had high efficiency about 4 to 10 times comparing with LiNbO3 which is now we mainly used for nonlinear ultrasound measurement. Then PMN-PT can be expected as the most promising for nonlinear ultrasound measurement because LiNbO3 and PMN-PT are single crystal that expected higher reliability for high voltage excitation due to grain free structure. As the low cost nonlinear ultrasonic measurement system, square burst pulser with a maximum excitation voltage of 600V is applied and furthermore eight of these square burst pulser were improved to developed as a 8 channel phased array system.Eight channels array was also made of PMN-PT piezoelectric element due to the basic design of an array using the IV1EIVIS lithography equipment lb confirm the validity of the nonlinear ultrasound array system, ultrasonic photoelastic visualization system was applied to observe a sound field.As the conclusion, low cost square burst pulser shows the enough high amplitude ultrasonic displacement comparing with the conventional nonlinear ultrasonic wave system. In addition to this sound field of the array can control with the developed eight channels phased array system although the number of channels was not enough. From another view, we can establish the estimation system for array and array system by using the photoelastic visualization method. Low cost nonlinear ultrasound phased array system will realize in near further combining the low cost pulser high efficient transducer and estimation equipment of array systems.

在对相控阵探头声场进行分析后，利用孔径合成技术将传统非线性超声波系统与商用相控阵系统相结合进行超声成像。然后，为了验证LiNbO3、PMN-PT、PZT和PbTiO3压电元件的有效性，我们利用上述元件制作了超声换能器，并系统地评估了各个元件的效率。因此，其他三种元件的效率比目前主要用于非线性超声测量的LiNbO3高约4至10倍。 PMN-PT 有望成为非线性超声测量中最有前途的材料，因为 LiNbO3 和 PMN-PT 是单晶，由于无晶粒结构，预计高压激励具有更高的可靠性。作为低成本的非线性超声测量系统，采用了最大激励电压为600V的方阵脉冲发生器，并进一步改进了八个方阵脉冲发生器，开发为8通道相控阵系统。八通道阵列也采用PMN-由于PT压电元件阵列的基本设计使用了IV1EIVIS光刻设备lb，证实了非线性超声阵列系统的有效性，应用超声光弹可视化系统来观察声场。作为结论，低成本方阵与传统的非线性超声波系统相比，脉冲发生器表现出足够高振幅的超声波位移。除此之外，虽然通道数量不够，但阵列的声场可以通过开发的八通道相控阵系统进行控制。从另一个角度来看，我们可以利用光弹性可视化方法建立阵列和阵列系统的估计系统。低成本非线性超声相控阵系统将进一步实现低成本脉冲发生器、高效换能器和阵列系统估计设备的结合。