Research of a novel fiber Bragg grating underwater acoustic sensor

Xingjie Ni, Yong Zhao, Jian Yang

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


A new type of optical fiber underwater acoustic sensor (hydrophone) constructed with two fiber Bragg gratings (FBG) and a self-demodulation method is presented in this paper. Unlike other FBG sensors which have separate sensing and demodulating elements, this FBG hydrophone has only a single structure for both sensing and demodulating using a pair of matched FBGs. The cylindrical structure of the hydrophone solves the problems of low sensitivity and cross-sensitivity of the bare fiber Bragg grating acoustic sensors. Theoretical analysis of measurement sensitivity is described. Simulation and preliminary experimental results indicate that the measurement sensitivity can reach 0.78 nm/MPa for underwater acoustic pressure in range of 100-200 dB re 1 μPa.

Original languageEnglish (US)
Pages (from-to)76-80
Number of pages5
JournalSensors and Actuators, A: Physical
Issue number1
StatePublished - Jul 20 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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