DEVELOPMENT OF VERSATILE ARRAY SENSOR USING MULTIDIMENSIONAL SIGNAL PROCESSING

使用多维信号处理开发多功能阵列传感器

• 批准号: 10450157
• 负责人: TAMURA Yasutaka
• 金额: $ 3.97万
• 依托单位: YAMAGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450157/
• 关键词: Multidimensional signal Processinng; Array signal processinng; 2-D ΔΣ-modulation; Wavefront generation; Piezoelectric polymer film; 3-D imaging

A novel coding technique for acoustical transducer arrays was proposed. This technique utilizes the multidimensional signal processing and band-limited property of array signals. Using the technique, a encoded wave-front can be efficiently generated from the array with multiple 1-bit waveforms.Following results are obtained :1. A production process for ultrasonic array transducers constructed by laminating P (VDF-TrFE) copolymer films on patterned electrodes was developed. The 2-D array for a 3-D ultrasound imaging system was constructed. The fractional bandwidth of the array was over than 200% at center frequency of 3.5MHz.2. A signal processing LSI which converts a multiple coded wavefront to 1bit sequences is designed using VHDL language and FPGAs.3. The relation between the SN ratio and the parameters of the 2-D ΔΣ-modulation, such as sampling frequency and array intervals was clarified. A decimation technique to enlarge the interval of the elements of the arrays was proposed.4. A trial 3-D imaging system was constructed using the developed array and peripheral circuits. This system was able to reconstruct 3-D images of simple targets in water or agar functions. The performance of the system, intensities of generated wave-fronts, spatial resolutions and dynamic ranges are investigated.The spatial resolutions were coincide with the theoretical values.This system consists of 16th digital pattern generator and array of switching amplifiers. While the amplifiers are directly controlled by digital pattern signal, the view angle and the dynamic range were low. This problem should be overcome by increased number of array elements and optimal image reconstruction algorithm. Finally, the new idea to reduced the complexity of high density array has been obtained.

提出了一种新的声学换能器阵列编码技术。该技术利用了多维信号处理和阵列信号的带限特性。研究结果如下：1.提出了一种将P(VDF-TrFE)共聚物薄膜叠层在图案化电极上的超声阵列换能器的制备工艺。构建了三维超声成像系统的二维阵列。在中心频率为3.5 MHz时，阵列的分数带宽大于200%。利用VHDL语言和现场可编程门阵列设计了一种将多个编码波前转换成1比特序列的信号处理LSI。阐明了信噪比与采样频率、阵列间隔等二维ΔΣ调制参数之间的关系。提出了一种扩大阵元间隔的抽取技术。利用研制的阵列和外围电路构建了一个试验性的三维成像系统。该系统能够重建水或琼脂中简单目标的3-D图像。对系统的性能、波前强度、空间分辨率和动态范围进行了研究，空间分辨率与理论值相符。该系统由16位数字方向图产生器和开关放大器阵列组成。而放大器直接由数字图样信号控制，视角小，动态范围小。这一问题需要通过增加阵元数目和优化图像重建算法来解决。最后，给出了降低高密度阵列复杂度的新思路。

项目成果

不破慎吾: "非線形特性を持つトランスデューサを用いるエッジ接続型アレイ収束する連続波の発生"計測自動制御学会講演会予稿集. 39(CD-ROM). 303C-1(4) (2000)

Shingo Fuwa：“使用具有非线性特性的传感器在边缘连接阵列中生成会聚连续波”仪器与控制工程师协会会议记录 39（CD-ROM）（2000 年）。

S.Fuwa, H.Takeuchi, H.Yanagida and Y.Tamura: "Edge Connected Acoustic Transducer Array Using Non-Linear Electro-Acoustic Features"Proceedings of SICE. 39303C-1 (CD-ROM). (2000)

S.Fuwa、H.Takeuchi、H.Yanagida 和 Y.Tamura：“利用非线性电声特征的边缘连接声学换能器阵列”SICE 论文集。

K.Yamamoto, S.Yoshizawa, K.Hodosawa, N.Yatame, H.Yanagida and Y.Tamura: "The Trial Production of Three-Dimensional Ultrasound Imaging System using Walsh-Function Modulated Waves"Proceedings of the symposium on ultrasonic electronics. 21. 355-356 (2000)

K.Yamamoto、S.Yoshizawa、K.Hodosawa、N.Yatame、H.Yanagida 和 Y.Tamura：“使用沃尔什函数调制波的三维超声成像系统的试制”超声电子学研讨会论文集。

吉澤重則: "3次元超音波撮像用アレイの構成と位置誤差補正"超音波エレクトロニクスの基礎と応用に関するシンポジウム予稿集. 21. 385-386 (2000)

Shigenori Yoshizawa：“三维超声成像阵列的配置和位置误差校正”超声电子学基础与应用研讨会论文集 21. 385-386 (2000)。

Y.Tamura: "Coding of Array Signal Using Multidimensional ΔΣ Modulation"Proceedings of SICE. 37. 683-684 (1998)

Y. Tamura：“使用多维 ΔΣ 调制对阵列信号进行编码”SICE 论文集 37. 683-684 (1998)。