Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2018-07-15

Journal: OPTICS LETTERS

Included Journals: SCIE

Volume: 43

Issue: 14

Page Number: 3417-3420

ISSN: 0146-9592

Abstract: We demonstrate a highly sensitive and stable fiber-optic Fabry-Perot cantilever microphone based on fast demodulated white-light interferometry. The cavity length of the low-finesse Fabry-Perot interferometry is absolutely measured by realizing a high-speed demodulation method utilizing a full spectrum, with the advantages of both high resolution and large dynamic range. An acoustic test demonstrates high sensitivities and linear responsivities at frequencies below 2 kHz. The pressure responsivity and the noise-limited minimum detectable acoustic pressure level are measured to be 211.2 nm/Pa and 5 mu Pa/Hz(1/2), respectively, at the frequency of 1 kHz. Comparative experimental results show that the signal-to-noise ratio is over 10 times higher than a reference condenser microphone. (C) 2018 Optical Society of America