Study on encoding stacked aperture technique to realize polymer ultrasonic probe with a higher performance

本研究提出了一种新的技术（编码堆叠孔径技术），可以大大提高聚合物超声探头的性能。这是一种通过控制偶极子的极性方向，通过叠加压电聚合物薄膜来实现更高性能的超声换能器技术。利用该技术，设计了一种m序列脉冲压缩超声探头，m序列调制波只能通过脉冲驱动传输，并证明了该技术的实用性。此外，通过开发另一种由不同厚度的压电聚合物薄膜组成的堆叠探针，不仅可以传输啁啾波，而且可以实现脉冲压缩的解调。

In this study, a novel technique (encoding stacked aperture technique) to improve greatly the performance of a polymer ultrasonic probe was proposed. This is a technique which achieves higher performance of an ultrasonic transducer by stacking piezoelectric polymer film after controlling the polarity direction of the dipole. With this technique, an M-sequence pulse compression ultrasonic probe which an M-sequence modulated wave can transmit only by impulse driving was devised, and the usefulness of this technique was demonstrated. Furthermore, by the development of another stacked probe which consists from piezoelectric polymer films of different thickness, not only chirp-wave transmission but the demodulation of pulse compression has become possible only by the probe.