Low cost underwater sound source

Abstract A new concept of a low-frequency (< 1000-Hz) underwater sound source has been proposed and tested (Donskoy and Blue, 1994). The present work is a further development of the source. A full scale reaction force driver to power the source was developed, built, and tested. In order to extend frequency band of the source, a double resonance approach (resonating reaction mass and resonating radiation piston) was employed. This approach allows for a significant extension (up to 400%) of the frequency band without an increase in a vibromotive force. The driver consists of a brushless servomotor, a brushless resolver for feedback, a Digital Signal Processor (DSP) based servo amplifier, and an interface with a PC. Vibromotive force is created with an eccentric weight mounted to a resonating mechanical structure. The driver can generate up to 8.000 lbs force, it has a programmable frequency control in the range up to 117 Hz, high power output (3.3 kW), compact size, low weight, and relatively low cost.

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A High-Frequency Sound based PGC Demodulation Scheme for Fiber Optics Hydrophone

10.21203/rs.3.rs-628907/v1 ◽

2021 ◽

Author(s):

Yunjie Shi ◽

Mengke Yin ◽

Zijue Zhu ◽

Shun Wang ◽

Panting Niu ◽

...

Keyword(s):

Fiber Optics ◽

Sound Source ◽

Acoustic Signal ◽

High Frequency ◽

Fiber Optic ◽

Low Cost ◽

Research Field ◽

Interference Signal ◽

High Frequency Sound ◽

Frequency Sound

Abstract In the research field of fiber-optic hydrophone, the performance of demodulation scheme is crucial. In this work, a phase-generated-carrier (PGC) demodulation scheme based on high-frequency sound source is proposed. Highfrequency acoustic signal from the external sound source is applied to the fiber-optic hydrophone to achieve phase modulation of the interference signal instead of the piezo-electrical transducer (PZT) or frequency-modulated laser. It possesses the merits of low system complexity and low cost. Through the acoustic detection experiment, we achieve demodulation of acoustic signal at frequency varying from 300 Hz to 800 Hz, and the signal-to-noise ratio (SNR) is higher than 45 dB. Furthermore, the proposed scheme is successfully applied to time division multiplexing (TDM) experiment.

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ENGINEERING OF ACOUSTIC TECHNOLOGY FOR UNDERWATER POSITIONING OBJECT

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v10i3.21456 ◽

2018 ◽

Vol 10 (3) ◽

pp. 629-637

Author(s):

Billi Rifa Kusumah ◽

Indra Jaya ◽

Henry M. Manik ◽

. Susilohadi

Keyword(s):

Control System ◽

Sound Source ◽

Arrival Time ◽

Equation Model ◽

Control Device ◽

Electromagnetic Signal ◽

Positioning System ◽

Underwater Sound ◽

Underwater Positioning ◽

The Difference

Underwater Positioning System (UPS) is a system to track the existence of the position of an object by utilizing the arrival time of the signal measurement. On land, the system uses an electromagnetic signal called GPS. However, because it cannot penetrate water effectively, an acoustic signal is used as an alternative. The purpose of this research is to engineer the control system of data acquisition and underwater acoustic device to measure arrival time (TOA) and apply equation model for underwater sound source positioning system. the effective frequency resonance of the transducer and the hydrophone is at a frequency of 6 kHz. The acquisition control device is able to measure the TOA signal with an error on a digital channel smaller than an analog channel. The difference between the TOA values measured by oscilloscope and acquisition control system is caused by inaccuracy of threshold estimates at the receiver's peak detector circuit. The position of the sound source coordinates obtained from the equation model shows the highest difference in depth point (z) compared to points (x) and (y), caused by the equation model used is limited to four hydrophone units forming a horizontal baseline.

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Efficient Sound-Source Localization system using low cost TDOA computation

2016 International Symposium on Electronics and Smart Devices (ISESD) ◽

10.1109/isesd.2016.7886741 ◽

2016 ◽

Cited By ~ 1

Author(s):

Radhian Ferel Armansyah ◽

Fadhli Dzil Ikram ◽

Swizya Satira Nolika ◽

Trio Adiono

Keyword(s):

Source Localization ◽

Sound Source ◽

Low Cost ◽

Sound Source Localization ◽

Localization System

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Underwater sound source characteristics from down-the-hole pile driving

The Journal of the Acoustical Society of America ◽

10.1121/1.5147306 ◽

2020 ◽

Vol 148 (4) ◽

pp. 2627-2627

Author(s):

Shane Guan ◽

James Reyff

Keyword(s):

Sound Source ◽

Pile Driving ◽

Underwater Sound ◽

Source Characteristics

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Monopole-driven underwater sound source

The Journal of the Acoustical Society of America ◽

10.1121/1.1919896 ◽

2005 ◽

Vol 117 (4) ◽

pp. 1688

Author(s):

Hans Thomas Rossby ◽

James H. Miller

Keyword(s):

Sound Source ◽

Underwater Sound

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A Passive Acoustic Positioning Algorithm Based on Virtual Long Baseline Matrix Window

Journal of Navigation ◽

10.1017/s0373463318000590 ◽

2018 ◽

Vol 72 (1) ◽

pp. 193-206 ◽

Cited By ~ 1

Author(s):

Tao Zhang ◽

Ziqiang Wang ◽

Yao Li ◽

Jinwu Tong

Keyword(s):

Sound Source ◽

Cross Correlation ◽

Autonomous Underwater Vehicles ◽

Underwater Sound ◽

Positioning Systems ◽

Long Baseline ◽

Positioning Method ◽

Passive Acoustic ◽

Positioning Algorithm ◽

Acoustic Positioning

A new acoustic positioning method for Autonomous Underwater Vehicles (AUV) that uses a single underwater hydrophone is proposed in this paper to solve problems of Long Baseline (LBL) array laying and communication synchronisation problems among all hydrophones in the traditional method. The proposed system comprises a Strapdown Inertial Navigation System (SINS), a single hydrophone installed at the bottom of the AUV and a single underwater sound source that emits signals periodically. A matrix of several virtual hydrophones is formed with the movement of the AUV. In every virtual LBL window, the time difference from the transmitted sound source to each virtual hydrophone is obtained by means of a Smooth Coherent Transformation (SCOT) weighting cross-correlation in the frequency domain. Then, the recent location of the AUV can be calculated. Simulation results indicate that the proposed method can effectively compensate for the position error of SINS. Thus, the positioning accuracy can be confined to 2 m, and the method achieves good applicability. Compared with traditional underwater acoustic positioning systems, the proposed method can provide great convenience in engineering implementation and can reduce costs.

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