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DEVELOPMENT OF SIGNAL PROCESSING ULTRASONIC ARRAY-SENSOR

信号处理超声波阵列传感器的开发

基本信息

批准号：
06650451
负责人：
TAMURA Yasutaka
金额：
$ 1.22万
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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

We have developed a ultrasonic array-sensor, encoding sperture (EA), which multiplex spatially distributed information of wavefront. We can control the signal processing function by changing transmitted waveforms.Following results are obtained :1. We have constructed the data acquisition system. A-2ch EA transducer was constructed by using P (VDF-TrFE) copolymer films according to an M-sequence. The array was constructed with a transmitter on the same film, then the positioning problem of the transducers are reducod. The electrostatic sealed significantly reduced the noise, and no averaging was needed.2. A new imaging operator was developed by SVD of the transfer matrix in the frequency domain. The calibration data is obtained using actual output waveforms corresponding to a target scanned along lines. A point target can be imaged with reasonable quality by the operator. The proposed technique provided images with high quality by a small number of data acquisitions and by a small scanning range of the transducer. The relative level of averaged artifacts is reduced by -7dB.3. A new selective focusing method is proposed for echolocation system. Transducers are constructed to a liner array coded with a binary sequence. The array converts a wavefront to a serial signal. Selective focusing is realized by transmitting a time-reversal waveforms. This enables us to control a focusing pattern with serial transmitting singal. The technique was applied to the adaptive focusing which select the object of maximum target strength. The unneeded signal level was reduced to-4dB by two iteration, this level, however, was increased with iteration number over two.

我们开发了一种超声波阵列传感器，编码孔径（EA），它可以复用波前的空间分布信息。我们可以通过改变发射波形来控制信号处理功能。得到以下结果： 1．我们构建了数据采集系统。 A-2ch EA 传感器是根据 M 序列使用 P (VDF-TrFE) 共聚物薄膜构建的。该阵列在同一薄膜上构造有发射器，从而减少了换能器的定位问题。静电密封显着降低了噪声，且无需平均。2．通过频域传输矩阵的 SVD 开发了一种新的成像算子。使用与沿线扫描的目标相对应的实际输出波形来获得校准数据。操作员可以对点目标进行合理质量的成像。所提出的技术通过少量的数据采集和传感器的小扫描范围提供了高质量的图像。平均伪影的相对水平降低了-7dB.3。提出了一种新的回声定位系统选择性聚焦方法。传感器被构造成用二进制序列编码的线性阵列。该阵列将波前转换为串行信号。通过传输时间反转波形来实现选择性聚焦。这使我们能够通过串行传输信号来控制聚焦模式。该技术应用于自适应聚焦，选择最大目标强度的物体。通过两次迭代，不需要的信号电平降低至-4dB，然而，该电平随着迭代次数超过两次而增加。