Sensitivity-Enhanced Wearable Active Voiceprint Sensor Based on Cellular Polypropylene Piezoelectret

作     者：Li, Wenbo Zhao, Sheng Wu, Nan Zhong, Junwen Wang, Bo Lin, Shizhe Chen, Shuwen Yuan, Fang Jiang, Hulin Xiao, Yongjun Hu, Bin Zhou, Jun 

作者机构：Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China 

出 版 物：《ACS APPLIED MATERIALS & INTERFACES》 (美国化学会应用材料与界面)

年 卷 期：2017年第9卷第28期

页      面：23716-23722页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China [51322210, 61434001, 51672097] National Program for Support of Top-notch Young Professionals Fundamental Research Funds for the Central Universities [HUST: 2015MS004] Director Fund of WNLO and Frontier Key Technological Innovation Special Foundation of Guangdong Province [2014B090915001] 

主　　题：piezoelectret voiceprint active sensor wearable electronics self-powered 

摘      要：Wearable active sensors have extensive applications in mobile biosensing and human machine interaction but require good flexibility, high sensitivity, excellent stability, and self-powered feature. In this work, cellular polypropylene (PP) piezoelectret was chosen as the core material of a sensitivity-enhanced wearable active voiceprint sensor (SWAVS) to realize voiceprint recognition. By virtue of the dipole orientation control method, the air layers in the piezoelectret were efficiently utilized, and the current sensitivity was enhanced (from 1.98 pA/Hz to 5.81 pA/Hz at 115 dB). The SWAVS exhibited the superiorities of high sensitivity, accurate frequency response, and excellent stability. The voiceprint recognition system could make correct reactions to human voices by judging both the password and speaker. This study presented a voiceprint sensor with potential applications in noncontact biometric recognition and safety guarantee systems, promoting the progress of wearable sensor networks.