Measurement research of the optical fiber vector hydrophone used in underwater acoustic applications in the deep ocean

2020 ◽  
Author(s):  
Yan Liang ◽  
Zhou Meng ◽  
Yu Chen ◽  
Jianfei Wang ◽  
Mo Chen
Keyword(s):  
Optical Fiber ◽  
Deep Ocean ◽  
Underwater Acoustic ◽  
Vector Hydrophone

scholarly journals Design and implementation of a jellyfish otolith-inspired MEMS vector hydrophone for low-frequency detection

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Renxin Wang ◽  
Wei Shen ◽  
Wenjun Zhang ◽  
Jinlong Song ◽  
Nansong Li ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Low Frequency ◽  
Directivity Pattern ◽  
Stress Distributions ◽  
Strong Response ◽  
Underwater Acoustic ◽  
Frequency Detection ◽  
Vector Hydrophone ◽  
Shock Resistance ◽  
Marine Applications

AbstractDetecting low-frequency underwater acoustic signals can be a challenge for marine applications. Inspired by the notably strong response of the auditory organs of pectis jellyfish to ultralow frequencies, a kind of otolith-inspired vector hydrophone (OVH) is developed, enabled by hollow buoyant spheres atop cilia. Full parametric analysis is performed to optimize the cilium structure in order to balance the resonance frequency and sensitivity. After the structural parameters of the OVH are determined, the stress distributions of various vector hydrophones are simulated and analyzed. The shock resistance of the OVH is also investigated. Finally, the OVH is fabricated and calibrated. The receiving sensitivity of the OVH is measured to be as high as −202.1 dB@100 Hz (0 dB@1 V/μPa), and the average equivalent pressure sensitivity over the frequency range of interest of the OVH reaches −173.8 dB when the frequency ranges from 20 to 200 Hz. The 3 dB polar width of the directivity pattern for the OVH is measured as 87°. Moreover, the OVH is demonstrated to operate under 10 MPa hydrostatic pressure. These results show that the OVH is promising in low-frequency underwater acoustic detection.

Pressure Optical Fiber Vector Hydrophone Made of Thin-Walled Cylindrical Shell

2008 ◽  
Vol 35 (8) ◽  
pp. 1214-1219 ◽  
Author(s):  
康崇 Kang Chong ◽  
张敏 Zhang Min ◽  
陈洪娟 Chen Hongjuan ◽  
庞盟 Pang Meng ◽  
吕文磊 Lü Wenlei ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Optical Fiber ◽  
Vector Hydrophone ◽  
Thin Walled

Bearing estimation for optical fiber vector hydrophone with in-band resonance

2020 ◽  
Vol 158 ◽  
pp. 107055
Author(s):  
Chengyan Peng ◽  
Xueliang Zhang ◽  
Zhou Meng
Keyword(s):  
Optical Fiber ◽  
Vector Hydrophone ◽  
Bearing Estimation

Research on double T-shape MEMS bionic vector hydrophone and its application in obstacle avoidance sonar

Sensor Review ◽  
2015 ◽  
Vol 35 (1) ◽  
pp. 76-84 ◽  
Author(s):  
Liu Linxian ◽  
Zhang Wendong ◽  
Zhang Guojun ◽  
Guan Linggang ◽  
Xue Chenyang ◽  
...  
Keyword(s):  
Obstacle Avoidance ◽  
Traffic Safety ◽  
Market Potential ◽  
Detection Sensitivity ◽  
Calibration Data ◽  
Underwater Acoustic ◽  
Content Type ◽  
Sonar System ◽  
Vector Hydrophone ◽  
Highly Effective

Purpose – The purpose of this paper is to develop a novel MEMS vector hydrophone with the key features of smaller size, better consistency, higher sensitivity and directional reception, and to develop a highly effective and economical obstacle avoidance sonar system. Currently, the typical vector hydrophones are resonant vector hydrophones based on the accelerometer, which greatly increases the volume and constrains the detection sensitivity. Also, because the system is composed of a number of devices, its size is difficult to be reduced. Design/methodology/approach – A novel double T-shape MEMS vector hydrophone is proposed with a fish’s lateral line organs as prototypes. The structure size and layout location of the piezoresistors were determined by simulation analysis, and the double T-shape microstructure was fabricated integrally by MEMS manufacturing technology, after which, the acoustic package of the microstructure was completed and the prototype was produced. Finally, the packaged hydrophone was calibrated in a standing wave field in the first-class national-defense underwater acoustic calibration station of China. Also, the design and test of an obstacle avoidance sonar system based on the vector hydrophone were completed. Findings – The calibration data show that the double T-shape vector hydrophone has a flat frequency response curve, exhibits a sensitivity of −180 dB (1 kHz, 0 dB reference 1 V/uPa) and shows a good directivity pattern in the form of an “8” shape. The test results of the obstacle avoidance sonar system further verify the feasibility of detecting underwater acoustic signals. Research limitations/implications – The next work is to increase the sensitivity by optimizing the microstructure and to realize orientation by organizing array. Practical implications – The hydrophone has the advantages of smaller size, lower cost and directional reception. It can be used to develop highly effective and economical obstacle avoidance sonar system, thus solving the problems of water transport efficiency and traffic safety. The hydrophone has broad application prospects and a huge market potential in the civilian fields. Originality/value – The MEMS technology and innovative bionic microstructure enable the miniaturization and low cost of the hydrophone. The hydrophone is easy to form array and can narrow the array aperture greatly. So, the hydrophone can be widely used in civil sonar systems.

Denoising of MEMS Vector Hydrophone Signal Based on Empirical Model Wavelet Method

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 11 ◽  
Author(s):  
Huichao Yan ◽  
Linmei Zhang
Keyword(s):  
Empirical Mode Decomposition ◽  
Signal Reconstruction ◽  
Acoustic Signals ◽  
Spectral Energy ◽  
Detection Accuracy ◽  
Denoising Method ◽  
Reconstruction Process ◽  
Underwater Acoustic ◽  
Mode Decomposition ◽  
Vector Hydrophone

Underwater acoustic technology is a major method in current ocean research and exploration, which support the detection of seabed environment and marine life. However, the detection accuracy is directly affected by the quality of underwater acoustic signals collected by hydrophones. Hydrophones are efficient and important tools for collecting underwater acoustic signals. The collected signals of hydrophone often contain lots kinds of noise as the work environment is unknown and complex. Traditional signal denoising methods, such as wavelet analysis and empirical mode decomposition, product unsatisfied results of denoising. In this paper, a denoising method combining wavelet threshold processing and empirical mode decomposition is proposed, and correlation analysis is added in the signal reconstruction process. Finally, the experiment proves that the proposed denoising method has a better denoising performance. With the employment of the proposed method, the underwater acoustic signals turn smoothly and the signal drift of the collected hydroacoustic signal is improved. Comparing the signal spectrums of other methods, the spectral energy of the proposed denoising method is more concentrated, and almost no energy attenuation occurred.

scholarly journals The Reflection Coefficients Measurement Method for the Underwater Acoustic Materials Based on the Single Vector Hydrophone

2019 ◽  
Vol 37 (5) ◽  
pp. 1036-1043
Author(s):  
Shengguo Shi ◽  
Chao Wang ◽  
Bo Hu
Keyword(s):  
Measurement Method ◽  
Free Field ◽  
Pulse Signal ◽  
Measuring Method ◽  
High Ratio ◽  
Reflection Coefficients ◽  
Inverse Filtering ◽  
Post Processing ◽  
Underwater Acoustic ◽  
Vector Hydrophone

In order to obtain the normal acoustic reflection coefficients of underwater acoustic materials in the free field with the wideband pulse signal, a new measuring method with a single vector hydrophone and the post-processing inverse filtering is put forward. Numerical simulations had been conducted to comparatively analyze the measurement performances of the measuring method. The simulation results show that the present method should be established on the high ratio of signal to the noise and it is not sensitive to the system error. The experiment result shows that the post-processing inverse filtering measuring method is more effective comparing with the method without the post-processing inverse filtering, especially the measurement consequence of the post-processing inverse filtering measurement method tends to the theoretical value when the frequency is higher than 2.5 kHz, because limitation of the transducer.

A four-element optical fiber 4C vector hydrophone array

2012 ◽  
Author(s):  
Jianfei Wang ◽  
Hong Luo ◽  
Yu Chen ◽  
Zhou Meng
Keyword(s):  
Optical Fiber ◽  
Vector Hydrophone ◽  
Hydrophone Array

Underwater Acoustic Sensor Using Optical Fiber Bragg Grating as Detecting Element

1999 ◽  
Vol 38 (Part 1, No. 5B) ◽  
pp. 3233-3236 ◽  
Author(s):  
Nobuaki Takahashi ◽  
Kanta Tetsumura ◽  
Sumio Takahashi
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Acoustic Sensor ◽  
Underwater Acoustic ◽  
Optical Fiber Bragg Grating
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