Acoustic optical fiber sensor based on graphene oxide membrane

Catarina S. Monteiro, Maria Raposo, Paulo A. Ribeiro, Susana O. Silva, Orlando Frazão

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A Fabry–Pérot acoustic sensor based on a graphene oxide membrane was developed with the aim to achieve a faster and simpler fabrication procedure when compared to similar graphene-based acoustic sensors. In addition, the proposed sensor was fabricated using methods that reduce chemical hazards and environmental impacts. The developed sensor, with an optical cavity of around 246 µm, showed a constant reflected signal amplitude of 6.8 ± 0.1 dB for 100 nm wavelength range. The sensor attained a wideband operation range between 20 and 100 kHz, with a maximum signal-to-noise ratio (SNR) of 32.7 dB at 25 kHz. The stability and sensitivity to temperatures up to 90C was also studied. Moreover, the proposed sensor offers the possibility to be applied as a wideband microphone or to be applied in more complex systems for structural analysis or imaging.

Original languageEnglish
Article number2336
JournalSensors
Volume21
Issue number7
DOIs
Publication statusPublished - 1 Apr 2021

Keywords

  • Acoustic sensor
  • Fabry–Pérot interferometer
  • Fiber optic sensor

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