College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunication, Nanjing 210023, China.
Sensors (Basel). 2020 Dec 18;20(24):7275. doi: 10.3390/s20247275.
An enhanced quarter-spherical acoustic energy harvester (AEH) with dual Helmholtz resonators was designed in this work. Compared with the previous research, this AEH can harvest multi-directional acoustic energy, has a widened resonance frequency band, and has an improved energy conversion efficiency. When the length of resonator's neck is changed, the acoustic resonant frequency of the two resonators is different. The theoretical models of output voltage and output power were studied, and the relationship of output performance with frequency was obtained. The results showed that this AEH can operate efficiently in a frequency band of about 470 Hz. Its output voltage was found to be about 28 mV, and its output power was found to be about 0.05 μW. The power density of this AEH was found to be about 12.7 µW/cm. Therefore, this AEH could be widely used in implantable medical devices such as implantable cardiac pacemakers, cochlear implants, and retinal prosthesis.
本文设计了一种具有双亥姆霍兹共振器的增强型四分之一球型声能采集器 (AEH)。与以往的研究相比，该 AEH 可以采集多向声能，具有更宽的共振频带，并且能量转换效率得到了提高。当共振器颈部的长度改变时，两个共振器的声学共振频率也会不同。研究了输出电压和输出功率的理论模型，得出了输出性能与频率的关系。结果表明，该 AEH 可以在约 470 Hz 的频带内高效运行。其输出电压约为 28 mV，输出功率约为 0.05 μW。该 AEH 的功率密度约为 12.7 µW/cm。因此，该 AEH 可广泛应用于植入式医疗器械，如植入式心脏起搏器、人工耳蜗和视网膜假体。
