2019_programme: DEVELOPMENT OF LOW-NOISE VECTOR SENSOR USING BENDING MODE RELAXOR FERROELECTRIC SINGLE CRYSTAL MATERIALS

• Session: 22. Vector Hydrophone Research
  Organiser(s): Yang Desen
• Lecture: DEVELOPMENT OF LOW-NOISE VECTOR SENSOR USING BENDING MODE RELAXOR FERROELECTRIC SINGLE CRYSTAL MATERIALS
  Paper ID: 829
  Author(s): Li Zhi
  Presenter: Li Zhi
  Presentation type: oral
  Abstract: With the development of vector sonar technology, the performance requirements for the vector sensors are gradually increasing, especially for the low-noise, high-sensitivity characteristics at low frequencies. Relaxor ferroelectric single crystal has higher piezoelectric coefficient and lower dielectric loss compared with piezoelectric ceramic, which can make the performance fundamentally improved. The [011] cut relaxor ferroelectric single crystal is proposed to develop the vector sensor in this paper. The dual-beam structure was designed to match the bending mode and anisotropic characteristics of the material. An inertial type vector sensor prototype was developed and characterized. The sensitivity of the prototype can reach to -215.2dB@100Hz, while the working frequency band is 20Hz~1000Hz. The dipole directivity pattern with null depth less than -30dB is obtained. The equivalent noise pressure level is significantly lower than the Knudsen ambient noise level of sea state zero (SS0) above 100Hz band, in which are 55.5dB@100Hz and 45.9dB@200Hz, respectively. This prototype provides the possibility to detect the low-noise target at low frequency.
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• Corresponding author: Dr Li Zhi
  Affiliation: School of Marine Science and Technology, Northwestern Polytechnical University.
  Country: China
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