Helmholtz Resonator for Lead Zirconate Titanate Acoustic Energy Harvester

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Matsuda, Tomohiro^1 ; Tomii, Kazuki^1 ; Hagiwara, Saori^1 ; Miyake, Shuntaro^1 ; Hasegawa, Yuichi^1 ; Sato, Takamitsu^1 ; Kaneko, Yuta^1 ; Nishioka, Yasushiro^1

Department of Precision Machinery Engineering, College of Science and Technology, Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-8501, Japan^1

关键词: Acoustic energy;    Energy Harvester;    Helmholtz resonance;    Helmholtz resonators;    Resonance frequencies;    Sound pressure level;    Sound pressures;    Wireless health monitoring systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012003/pdf
DOI  :  10.1088/1742-6596/476/1/012003

来源: IOP

【 摘 要 】

Acoustic energy harvesters that function in environments where sound pressure is extremely high (∼150 dB), such as in engine rooms of aircrafts, are expected to be capable of powering wireless health monitoring systems. This paper presents the power generation performances of a lead-zirconate-titanate (PZT) acoustic energy harvester with a vibrating PZT diaphragm. The diaphragm had a diameter of 2 mm, consisting of Al(0.1 μm)/PZT(1 μm)/Pt(0.1 μm)/Ti(0.1 μm)/SiO2(1.5 μm). The harvester generated a power of 1.7×10-13 W under a sound pressure level of 110 dB at the first resonance frequency of 6.28 kHz. It was found that the generated power was increased to 6.8×10-13 W using a sound-collecting Helmholtz resonator cone with the height of 60 mm. The cone provided a Helmholtz resonance at 5.8 kHz, and the generated power increased from 3.4×10-14 W to 1.4×10-13 W at this frequency. The cone was also effective in increasing the bandwidth of the energy harvester.