Motaei Farzaneh, Bahrami Ali
Optoelectronics and Nanophotonics Research Lab. (ONRL), Faculty of Electrical Engineering, Sahand University of Technology, Tabriz, Iran.
Sci Rep. 2022 Jun 22;12(1):10522. doi: 10.1038/s41598-022-14134-9.
In this investigation, a phononic crystal-based fiber is proposed for energy harvesting application in metalworking factories. Phononic crystal plays the role of cladding in elastic fiber structure. Each of single-core fibers includes a tungsten hollow cylinder in central region which its internal radius is different in three single-core fibers. Incident waves with central frequency from 25 to 40 kHz of 1/3 octave band are confined in the core region of proposed elastic fibers and transmitted to desired distance. High confinement and transmission ability without significant longitudinal loss make this structure distinct from the other phononic crystals-based energy harvesters. By utilizing of a piezoelectric film at the end of fiber cores, mechanical energy is converted to electrical energy. As proposed elastic fibers confine the applied waves with high quality, the obtained output power is enhanced up to 800 times in comparison with the bare case. Maximum value of extinction ratio between all single core fibers is equal to - 23 dB. Also, longitudinal loss is almost equal to 0.9 dB/km.
在本研究中，提出了一种基于声子晶体的光纤，用于金属加工厂的能量收集应用。声子晶体在弹性光纤结构中起到包层的作用。每根单芯光纤在中心区域包括一个钨空心圆柱体，其内径在三根单芯光纤中各不相同。中心频率在25至40kHz的1/3倍频程带的入射波被限制在所提出的弹性光纤的纤芯区域，并传输到所需距离。高限制和传输能力且无明显纵向损耗使得这种结构有别于其他基于声子晶体的能量收集器。通过在光纤纤芯末端使用压电薄膜，机械能被转换为电能。由于所提出的弹性光纤能高质量地限制施加的波，与裸光纤情况相比，获得的输出功率提高了800倍。所有单芯光纤之间消光比的最大值等于 -23dB。此外，纵向损耗几乎等于0.9dB/km。
