Microplasma microphones

Abstract

It is shown experimentally that a microplasma created by a microstructured electrode array is sensitive to sound pressure. In this paper, two electrode architectures are used to create the microplasma. The sensitivity of these microplasma microphones, close to 0.4 nA/Pa, is estimated using a waveguide and a calibration method by comparison with a reference microphone. An empirical expression of the acoustic pressure sensitivity of microdischarges is proposed. The predictions of this empirical model are in good agreement with the experimental data.

Fabric‐Based Ultrasonic Sensor with Integrated Piezoelectric Composite for Blood Pressure Monitoring

“…Therefore, the ultrasonic transducer can be used as both a transmitter and a receiver of ultrasonic waves. [55] In monitoring blood pressure waveforms, the ultrasound sensor acts as both an ultrasound transmitter and an ultrasound receiver, using the pulse-echo method. The ultrasound transducer is activated to emit ultrasound waves by periodic high-frequency narrow pulsed electrical signals, and then the ultrasound sensor receives the reflected acoustic signals.…”