fig7

Figure 7. Applications in acoustic sensing. (A) Principles and design of fabric microphones; (B) The application of acoustic fabrics for communication^[100]. Copyright 2022 Springer Nature; (C) Schematic and image of the ultrasensitive all-nanofiber acoustic sensor; (D) Voltage waveform generated when a sound wave of constant frequency (250 Hz) and sound pressure level of 110-dB is applied to the sensor; (E) Comparison of cardiac signals measured by a commercial cardiac microphone and an all-nanofiber sensor, as well as a magnified view of the signals^[101]. Copyright 2020 PNAS.