Jia Lu, Yan Yingzhan, Xu Jing, Gao Yuan
Information Science Academy, China Electronics Technology Group Corporation, Beijing 100142, China.
National Key Laboratory of Integrated Circuits and Microsystems, Beijing 100142, China.
Sensors (Basel). 2024 Aug 30;24(17):5635. doi: 10.3390/s24175635.
Flexible ultrasonic devices represent a feasible technology for providing timely signal detection and even a non-invasive disease treatment for the human brain. However, the deformation of the devices is always accompanied by a change in the acoustic field, making it hard for accurate focusing. Herein, we report a stable and flexible transducer. This device can generate a high-intensity acoustic signal with a controllable acoustic field even when the device is bent. The key is to use a low-impedance piezoelectric material and an island-bridge device structure, as well as to design a unique time-reversal algorithm to correct the deviation of signals after transcranial propagation. To provide an in-depth study of the acoustic field of flexible devices, we also analyze the effects of mechanical deformation and structural parameters on the corresponding acoustic response.
柔性超声设备是一种可行的技术，可用于及时进行信号检测，甚至对人脑进行非侵入性疾病治疗。然而，设备的变形总是伴随着声场的变化，这使得精确聚焦变得困难。在此，我们报告一种稳定且柔性的换能器。即使该设备弯曲时，此装置也能产生具有可控声场的高强度声信号。关键在于使用低阻抗压电材料和岛桥式器件结构，以及设计独特的时间反转算法来校正经颅传播后信号的偏差。为了深入研究柔性设备的声场，我们还分析了机械变形和结构参数对相应声学响应的影响。
