Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology , Wuhan 430074, China.
ACS Appl Mater Interfaces. 2017 Jul 19;9(28):23716-23722. doi: 10.1021/acsami.7b05051. Epub 2017 Jul 6.
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.
可穿戴式有源传感器在移动生物传感和人机交互中有着广泛的应用，但需要具备良好的柔韧性、高灵敏度、出色的稳定性和自供电功能。在这项工作中，选用了纤维聚丙烯 (PP) 驻极体作为增强型可穿戴主动声纹传感器 (SWAVS) 的核心材料，以实现声纹识别。通过偶极力定向控制方法，有效利用了驻极体中的空气层，提高了电流灵敏度（在 115dB 时从 1.98pA/Hz 增强到 5.81pA/Hz）。SWAVS 具有高灵敏度、精确的频率响应和出色的稳定性等优势。声纹识别系统可以通过判断密码和说话人来对人声做出正确反应。本研究提出了一种具有非接触式生物识别和安全保障系统应用潜力的声纹传感器，推动了可穿戴传感器网络的发展。
