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Proposal and verification of sensitivity calibration methods for miniature hydrophones in the high frequency range

Research Project

Project/Area Number 10650404
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Measurement engineering
Research InstitutionThe University of Electro-Communications

Principal Investigator

KAMAKURA Tomoo  Department of Electro-Communication, The University of Electro-Communications, Professor, 電気通信学部, 教授 (50109279)

Co-Investigator(Kenkyū-buntansha) 鎌倉 友男  電気通信大学, 電気通信学部, 教授 (50109279)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
Keywordshydrophone / reciprocity calibration / nonlinear acoustics / waveform distortion / harmonics / 校正
Research Abstract

Two different kinds of miniature PVDF hydrophones of 0.6mm and 1mm in diameter have been calibrated for their sensitivity responses using two methods. One of which is based on a conventional methodology, the reciprocity calibration, and the other is based on nonlinear propagation of sound beams. Specifically, ultrasound beams of finite amplitude generate waveform distortions due to the inherent nonlinearity of a medium, and plenty of harmonics appear significantly in the beam. The magnitudes of individual harmonic components are theoretically predicted by a model equation that we propose for precise description of nonlinear sound beams. The harmonic pressures are strongly dependent on source conditions such as driving frequency and source pressure level. The sensitivity response of output voltage to pressure at the fundamental frequency is measured by the reciprocity method. The information of the fundamental frequency source conditions uniquely determines all the pressure magnitudes of higher harmonics. By detailed comparison of harmonic pressures between experiment and theory, the calibration in the frequency range of 2.5 to 20MHz has been performed for the two different hydrophones. It has been concluded that the sensitivity responses for the hydrophones are overall in good agreement with the attached data sheets within 1.5dB differences.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Tomoo Kamakura: "A theoretical approach to the analysis of nonlinear sound beams using the oblate spheroidal coordinate systems"J. Acount. Soc. Am.. 105 (6). 3083-3086 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tomoo Kamakura et al.: "A theoretical approach to the analysis of nonlinear sound beams using the oblate spheroidal coordinate system"J. Acoust. Soc. Am.. 105(6). 3083-3086 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tomoo Kamakura: "A theoretical approach to the analysis of nonlinear sound beams using the oblate spheroidal coordinate system"J. Acoust. Soc. Am.. 105(6). 3083-3086 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Kamakura et al.: "A new theoretical approach to the analysis of ncnlinear sound beams using the oblate spheroidal coordirate system" J.Accust.Soc.Amer.(in press). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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