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Method for Measuring Self-noise of Vector Hydrophones 被引量:1
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作者 Zhi Li Hongjuan Chen 《Journal of Marine Science and Application》 CSCD 2017年第3期370-374,共5页
The Vector Hydrophone(VH) is widely used to remotely detect underwater targets. Accurately measuring the self-noise of the VH provides an important basis for evaluating the performance of the detection system in which... The Vector Hydrophone(VH) is widely used to remotely detect underwater targets. Accurately measuring the self-noise of the VH provides an important basis for evaluating the performance of the detection system in which it is utilized, since the ability to acquire weak signals is determined by the VH self-noise level. To accurately measure the VH self-noise level in actual working conditions, the Dual-channel Transfer Function Method(DTFM) is proposed to reduce ambient background noise interference. In this paper, the underlying principles of DTFM in reducing ambient background noise is analyzed. The numerical simulations to determine the influence of ambient background noise, and the sensitivity difference of the two VHs on the measurement results are studied. The results of measuring the VH self-noise level in a small laboratory water tank by using DTMF indicate that ambient background noise interference can be reduced effectively by employing DTMF, more accurate self-noise level can be obtained as well. The DTMF provides an effective method for accurately measuring the self-noise level of VHs and also provides technical support for the practical application of the VH in underwater acoustics. 展开更多
关键词 SELF-NOISE vector hydrophone acoustic measurement underwater transducer transfer function method
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Outer cavity Janus-Helmholtz underwater acoustic transducer 被引量:2
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作者 SANG Yongjie LAN Yu +1 位作者 WU Tong DING Yuewen 《Chinese Journal of Acoustics》 CSCD 2018年第2期158-166,共9页
The outer cavity Janus-Helmholtz with sound insulation layer is presented for ob- taining the capacity of high-power non-directional transmitting. The radiation efficiency and directivity in the 0 degrees direction ca... The outer cavity Janus-Helmholtz with sound insulation layer is presented for ob- taining the capacity of high-power non-directional transmitting. The radiation efficiency and directivity in the 0 degrees direction can be improved when the radiation mode is changed by laying sound insulation layer. The operating bandwidth can be expanded effectively by the dual mode coupling between the cavity vibration and longitudinal vibration of Janus transducer. A prototype is designed by finite element method. Test results show that the results are in good agreement with the design results. Compared with inner cavity Janus-Helmholtz transducer, acoustic radiation performance of outer cavity Janus-Helmholtz underwater acoustic transducer in the 0 degrees direction has been significantly improved. 展开更多
关键词 Outer cavity Janus-Helmholtz underwater acoustic transducer
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