Design of Multi-frequency Acoustic Source with Piezoelectric PVDF Film Array [基于PVDF压电薄膜阵列的多频声源设计]

作者：Hu M.; Kong D.; Xie D.; Tang X.; Xu H.

来源：Piezoelectrics & Acoustooptics, 2020, 42(5): 598-602.

DOI：10.11977/j.issn.1004-2474.2020.05.004

• Alternating excitation
• Amplitude frequency characteristic
• Drive circuit
• Piezoelectric film
• Simulated acoustic source

A multi-frequency acoustic source device composed of PVDF and resin matrix is designed in this work. The PVDF piezoelectric thin film is driven by a four-line excitation circuit with the adjustable amplitude ranged from 0 to 2 000 V, and the frequency ranged from 100 Hz to 2 000 Hz. By adjusting the frequency and amplitude of the signal that excites the PVDF film, the frequency spectrum of the sound source can be controlled. The measurement results of spectrum analyzer show that the spectrum of sound source can be adjusted dynamically according to the input signal and the mixed analog noise with multi-frequency peaks can be generated.With the increase of excitation voltage, the sound pressure level of noise source increases obviously. The multi-frequency acoustic source device is promising to be applied to the measurement of the property detection of sound-absorbing materials.

• 单位
  合肥工业大学; 传感技术国家重点实验室; 中国科学院