| 초록 |
Flexible and wearable vibration sensors have been researched for skin-attachable mechanosensors to recognize human voice. However, previously developed devices did not achieve sufficient portability and clear voice detection in harsh acoustic environment. Here, we present a highly sensitive vibration-responsive vocal sensor designed by introducing electret polymer material to a flexible capacitive diaphragm structure. With the polymer diaphragm with low stiffness and low damping properties, our device exhibits a high and linear vibration sensitivity over the vocal frequency range, and thus can quantitatively characterize the human voice. The electret polymer diaphragm with optimized charging properties reduces the external power source to operate a sensor, which results in high portability and sensitivity of the device. Our device shows accurate voice detection even in a harsh acoustic environment by detecting human voice through neck skin vibration. |
