2019_programme: NEAR-FIELD PARTICLE VELOCITY MEASUREMENT OF THE HIGH FREQUENCY PROJECTORS USING LASER VIBROMETRY METHOD

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  • Session: 02. Underwater acoustic calibration, testing, facilities and standards
    Organiser(s): Robinson Stephen, Humphrey Victor, Linné Markus, Évora Victor
  • Lecture: NEAR-FIELD PARTICLE VELOCITY MEASUREMENT OF THE HIGH FREQUENCY PROJECTORS USING LASER VIBROMETRY METHOD [invited]
    Paper ID: 801
    Author(s): Wang Shiquan, Wang Weiyin, Chen Yi
    Presenter: Chen Yi
    Presentation type: oral
    Abstract: The near-field acoustic fields of the high frequency projectors were investigated using the laser vibrometry method and the far-field directivities were calculated with the near-field data. A automatic scanning measurement system based on optical method was setup and introduced. The acoustic fields of the projectors were measured at the plane close to surface using a commercial laser vibrometer. The amplitude and phase distributions of the particle velocity in the measurement plane were obtained. As a comparison，the acoustic pressure fields were also measured with a needle hydrophone at the same plane away from the surface of the projectors. The far-field directivities were then calculated with the near-field particle velocity data based on Rayleigh integrals. The measured far-field directivities were compared to the calculated results. It showed that they were in good agreements. It is an effective way to measure the near-field particle velocity distributions and also a practical method to predict the far-field directivities of the projectors with the combination of the RI.
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  • Corresponding author: Mr Wang Shiquan
    Affiliation: Hangzhou Applied Acoustics Research Institute
    Country: China
    e-mail:

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