Optical hydraulic pressure sensor using frequency shifted-feedback laser for ocean-bottom-tsunami sensing

T. Hara, Fumihiko Imamura, H. Ito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

We propose and demonstrate hydraulic pressure measurement using an optical frequency domain reflectometry technique in combination with a fiber-optic sensor for all optically real-time geophysical observatory system on deep seafloor. The hydraulic pressure causes a change in the optical strain of the fiber sensor. The sensor was constructed as Michelson interferometer with dispersion-shifted fiber with 2615-m in roundtrip optical path difference, an optical coupler and two faraday rotator mirrors. It was rolled on a hollow mandrel with an aluminum-alloy material to obtain a linear response as elastic characteristic under the high pressure of 4,000-m depth. The sensitivities of this sensor were -0.0234-ppb/Pa and 28.5-ppm/degree-C, respectively, in hydraulic pressure and water temperature. To detect this slight strain, we used a frequency-shifted feedback laser as an optical source. In our experimental setup, we obtained standard deviation of 9.6-ppb for optical strain measurement with two seconds period each; it corresponds to 41-mm in pressure measurement with above-mentioned sensor and a thermistor temperature sensor for temperature compensation. Further improvement of the measurement accuracy is possible based on this first preliminary experiment.

Original languageEnglish
Title of host publicationSSC 2003 - 3rd International Workshop on Scientific Use of Submarine Cables and Related Technologies
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages45-50
Number of pages6
ISBN (Electronic)0780377753, 9780780377752
DOIs
Publication statusPublished - 2003 Jan 1
Event3rd International Workshop on Scientific Use of Submarine Cables and Related Technologies, SSC 2003 - Tokyo, Japan
Duration: 2003 Jun 252003 Jun 27

Publication series

NameSSC 2003 - 3rd International Workshop on Scientific Use of Submarine Cables and Related Technologies

Other

Other3rd International Workshop on Scientific Use of Submarine Cables and Related Technologies, SSC 2003
CountryJapan
CityTokyo
Period03/6/2503/6/27

Keywords

  • Capacitive sensors
  • Frequency
  • Optical feedback
  • Optical fiber couplers
  • Optical fiber sensors
  • Optical interferometry
  • Optical sensors
  • Pressure measurement
  • Sensor phenomena and characterization
  • Temperature sensors

ASJC Scopus subject areas

  • Automotive Engineering
  • Signal Processing
  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Ocean Engineering

Fingerprint Dive into the research topics of 'Optical hydraulic pressure sensor using frequency shifted-feedback laser for ocean-bottom-tsunami sensing'. Together they form a unique fingerprint.

  • Cite this

    Hara, T., Imamura, F., & Ito, H. (2003). Optical hydraulic pressure sensor using frequency shifted-feedback laser for ocean-bottom-tsunami sensing. In SSC 2003 - 3rd International Workshop on Scientific Use of Submarine Cables and Related Technologies (pp. 45-50). [1224108] (SSC 2003 - 3rd International Workshop on Scientific Use of Submarine Cables and Related Technologies). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/SSC.2003.1224108