Low-Cost, High-Sensitivity Hydrophone Based on Resonant Air Cavity

Huang, Xinjing; Li, Zan; Li, Jian; Wang, Xin; Feng, Hao; Zhang, Yu; Rui, Xiaobo

doi:10.1109/jsen.2020.3048066

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…The whole resonator system was isolated from the outside world by using an acrylic encapsulation shell. The acoustic permeability of the encapsulation shell is extremely important for the CaF 2 resonator acoustic sensing system [24]. Since the acoustic impedance of the acrylic shell does not match the acoustic impedance of water, the acoustic transmissive cap of the hydrophone is usually made of acoustically transmissive polyurethane material.…”

Section: R R Nmentioning

confidence: 99%

Underwater Low-Frequency Acoustic Wave Detection Based on a High-Q CaF2 Resonator

Yuan,

Rong,

Zhang

et al. 2024

Machines

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Whispering gallery mode (WGM) resonators with an ultra-high quality (Q) factor provide a new idea for high-precision underwater acoustic sensing. However, acoustic energy loss due to watertight encapsulation has become an urgent problem for its underwater application. In order to solve this problem, this paper proposes a hollowed-out array structure. The finite element simulation shows that the acoustic wave transmission loss is improved by 30 dB compared with that of the flat plate encapsulation structure. Using a calcium fluoride (CaF2) resonator with a Q factor of 1.2 × 108 as an acoustic sensitive unit, the amplitude and frequency of the loaded acoustic wave are retrieved by means of the dispersion coupling response mechanism. The resonator’s underwater experimental test range is 100 Hz–1 kHz, its acoustic sensing sensitivity level reaches −176.3 dB re 1 V/µPa @ 300 Hz, and its minimum detectable pressure can be up to 0.87 mPa/Hz1/2, which corresponds to a noise-equivalent pressure (NEP) of up to 58 dB re 1 µPa/Hz1/2.

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Section: R R Nmentioning

confidence: 99%

Underwater Low-Frequency Acoustic Wave Detection Based on a High-Q CaF2 Resonator

Yuan,

Rong,

Zhang

et al. 2024

Machines

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“…A lot of research is focused on improving sensor sensitivity to accurately detect low pressure [20]. A Fabry-Perot based interferometric design is very common [21]- [23], while other structures are considered, too [24]- [27]. The type of fiber hydrophone considered here is based on reflectance changes at the waterglass interface due to the pressure induced changes of the refractive index of water.…”

Section: Introductionmentioning

confidence: 99%

Localized Measurement of a Sub-Nanosecond Shockwave Pressure Rise Time

Petelin

Lokar

Horvat

et al. 2022

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In a growing number of applications fast and localized pressure measurement in aqueous media is desired. To perform such measurements a custom made single-mode fiber optic probe hydrophone (FOPH) was designed and used to measure the pressure pulse generated by laser induced breakdown in water. The sensor enabled sub-nanosecond pressure rise time measurement. Both the rise time and the duration of the shockwave were found to be shorter in the direction perpendicular to the breakdown generating laser beam, compared to the shockwave observed in the parallel direction. Simultaneous highframerate imaging was used to qualitatively validate the novel hydrophone data and to observe the shockwave evolution. The measurements were performed also on pressure pulses emitted during generation of miniature (150 µm diameter) laser-induced bubbles at very small distances (down to 40 µm), further demonstrating the capabilities of the small-size sensor and the ability to measure locally. The results improve understanding of laser induced breakdown shockwave characteristics dependence on laser pulse energy and duration.

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A porpoise-inspired receptor to enhance broadband sound reception

Song

Gao

et al. 2023

Applied Physics Letters

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Odontocetes have developed a broadband sound reception system that performs well underwater. We used aluminum materials and soft silica gels to fabricate a bio-receptor to mimic the sound reception system of a finless porpoise. Both numerical modeling and experiments suggested that compared to omnidirectional reception, the porpoise-inspired receptor can achieve broadband and directional sound reception with frequencies ranging from 15 to 90 kHz and enhance the reception by an average of 3.9 dB in this bandwidth. At some frequencies, this reception improvement can reach 7.3 dB in experimental data. This work provides an alternate idea to design sound receptors to be applied in underwater broadband and directional sound reception.

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Low-Cost, High-Sensitivity Hydrophone Based on Resonant Air Cavity

Cited by 3 publications

References 23 publications

Underwater Low-Frequency Acoustic Wave Detection Based on a High-Q CaF2 Resonator

Underwater Low-Frequency Acoustic Wave Detection Based on a High-Q CaF2 Resonator

Localized Measurement of a Sub-Nanosecond Shockwave Pressure Rise Time

A porpoise-inspired receptor to enhance broadband sound reception

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