An ultrahigh sensitivity acoustic sensor system for weak signal detection based on an ultrahigh-Q CaF₂ resonator.

ABSTRACT: Acoustic sensors with ultrahigh sensitivity, broadband response, and high resolution are essential for high-precision nondestructive weak signal detection technology. In this paper, based on the size effect of an ultrahigh-quality (Q) calcium fluoride (CaF₂) resonator, a weak acoustic signal is detected by the dispersive response regime in which an acoustic, elastic wave modulates the geometry and is converted to a resonance frequency shift. Through the structural design of the resonator, the sensitivity reaches 11.54 V/Pa at 10 kHz in the experiment. To our knowledge, the result is higher than that of other optical resonator acoustic sensors. We further detected a weak signal as low as 9.4 µPa/Hz^1/2, which greatly improved the detection resolution. With a good

SUBMITTER: Xing T 

PROVIDER: S-EPMC10192424 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature