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DEVELOPMENT OF A MOMENT ECHOGRAPHY SYSTEM WITH A SINGLE ULTRASOUND SENSOR

具有单个超声传感器的矩回波描记系统的开发

基本信息

批准号：
04650360
负责人：
TAMURA Yasutaka
金额：
$ 1.15万
依托单位：
YAMAGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650360/
关键词：
Acoustical transducer Acoustical imaging Beam forming Piezoelectric polymer film Inverse problem 高分子圧電膜 M系列

项目摘要

In the research, we have tested the feasibility of a new acoustical sensor which have an spatial resolving ability based on a new concept. In the sensor, a single signal channel is connected to a transducer whose sensitivity is spatially modulated on an aperture. If the spatial modulating function is so designed to have an impulse response from which we can distinguish the direction and delay of propagated wavefront, we can control the directivity using the detected waveforms. We have called the aperture of the sensor "Encoding Aperture". This sensor can steer a directivity without any mechanical and/or electrical scanning. Beam-forming can be performed with an entirely digital ans indirect manner. Furthermore, the sensor can acquire data with only a single transmitting and receiving process.We proposed three implementations for the apertures. The first one uses a piezoelectric film with an electrode whose pattern is designed according to a spatial modulating function. The second and the third use an inclined 1-D or 2-D arrays coded with binary sequences. We also proposed an discriminating operator using a pseudo-inversion of the propagation matrix of the sensing system.Experimental systems using 5MHz ultrasound in water or 50KHz one in air were constructed. The relative levels of undesired peaks emerges in PSF of the systems were less than -40dB when the developed operator was used. The results demonstrate the feasibility of the sensor to the 2-D echography.

在研究中，我们测试了一种基于新概念的具有空间分辨能力的新型声学传感器的可行性。在传感器中，单个信号通道连接到换能器，换能器的灵敏度被空间调制在孔径上。如果空间调制函数被设计成具有脉冲响应，由此我们可以区分传播的波前的方向和延迟，我们就可以利用检测到的波形来控制方向性。我们把传感器的光圈称为“编码光圈”。该传感器无需任何机械和/或电子扫描即可控制方向性。波束形成可以用完全数字ANS间接方式来执行。此外，该传感器只需一次发送和接收过程即可采集数据。第一种是一种带有电极的压电薄膜，其图案是根据空间调制函数设计的。第二个和第三个使用倾斜的1-D或2-D阵列，用二进制序列编码。我们还提出了一种基于传播矩阵伪逆的识别算子，分别构建了水中5 MHz超声和空气中50 kHz超声的实验系统。当使用改进的算子时，系统的PSF中出现的不希望出现的峰的相对电平小于-40dB。实验结果证明了该传感器应用于二维超声检测的可行性。