Ren Kailiang, West James E, Yu S Michael
Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218
Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218
J Acoust Soc Am. 2014 Jun;135(6):EL291-7. doi: 10.1121/1.4874356.
Velocity and pressure microphones composed of piezoelectric poly(γ-benzyl-α,L-glutamate) (PBLG) nanofibers were produced by adhering a single layer of PBLG film to a Mylar diaphragm. The device exhibited a sensitivity of -60 dBV/Pa in air, and both pressure and velocity response showed a broad frequency response that was primarily controlled by the stiffness of the supporting diaphragm. The pressure microphone response was ±3 dB between 200 Hz and 4 kHz when measured in a semi-anechoic chamber. Thermal stability, easy fabrication, and simple design make this single element transducer ideal for various applications including those for underwater and high temperature use.
通过将单层聚（γ-苄基-α，L-谷氨酸）（PBLG）薄膜粘附到聚酯薄膜振膜上，制备了由压电PBLG纳米纤维组成的速度和压力麦克风。该器件在空气中的灵敏度为-60 dBV/Pa，压力和速度响应均呈现出宽频响应，主要由支撑振膜的刚度控制。在半消声室中测量时，压力麦克风在200 Hz至4 kHz之间的响应为±3 dB。热稳定性、易于制造和设计简单使得这种单元件换能器非常适合包括水下和高温应用在内的各种应用。
