Doubly resonant underwater acoustic transducer for long distance sound propagation

2014 ◽  
Vol 135 (4) ◽  
pp. 2304-2304
Author(s):  
Andrey K. Morozov
Keyword(s):  
Sound Propagation ◽  
Long Distance ◽  
Underwater Acoustic ◽  
Acoustic Transducer

scholarly journals The Acoustic System of the Fendouzhe HOV

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7478
Author(s):  
Yeyao Liu ◽  
Jingfeng Xue ◽  
Bo Yang ◽  
Min Zhu ◽  
Weizhen Guo ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Underwater Acoustic Communication ◽  
Integrated Navigation ◽  
Acoustic System ◽  
Long Distance ◽  
Radio Communications ◽  
Underwater Acoustic ◽  
Positioning Systems ◽  
Integrated Navigation System ◽  
Manned Submersible

Due to the strong absorption and attenuation of electromagnetic waves by water, radio communications and global positioning systems are lacking in the deep-sea environment. Therefore, underwater long-distance communications, positioning, detection and other functions depend on acoustic technology. In order to realize the above functions, the acoustic system of the Fendouzhe human occupied vehicle (HOV) is composed of eight kinds of sonars and sensors, which is one of the core systems of manned submersible. Based on the Jiaolong/Shenhai Yongshi HOVs, the acoustic system of the Fendouzhe HOV has been developed. Compared with the previous technology, there are many technical improvements and innovations: 10,000-m underwater acoustic communication, 10,000-m underwater acoustic positioning, multi-beam forward-looking imaging sonar, an integrated navigation system, etc. This study introduces the structure of the acoustic system of the Fendouzhe HOV and the technical improvements compared with the Jiaolong/Shenhai Yongshi HOVs. The results of the acoustic system are illustrated by the 10,000-m sea trails in the Mariana Trench from October to December 2020.

Development of Automated Measurement Setup for Characterizing Underwater Acoustic Transducers

2016 ◽  
Vol 50 (6) ◽  
pp. 69-75
Author(s):  
Amirthalingam Malarkodi ◽  
Peddinti SSR Sridhar ◽  
Ganesan Latha
Keyword(s):  
Accurate Determination ◽  
Motion Controller ◽  
Report Generation ◽  
Underwater Acoustic ◽  
Acoustic Transducers ◽  
Acoustic Transducer ◽  
Measurement Results ◽  
Computer Based ◽  
Calibration Program

AbstractAccurate determination of sensitivity and directivity is important for any underwater acoustic transducer. In this work, an automatic measuring platform was designed and implemented for characterizing underwater acoustic transducers. The overall hardware setup includes a PXI (PCI Extensions for Instrumentation)-based data acquisition system, computer-based controller module, motion controller module, and LabVIEW-based automatic calibration program. The system performs a sequence of operations automatically and achieves synchronous control of transmission and acquisition of real-time acoustic signals as well as processing, recording, and report generation. This measurement platform can be utilized for characterizing any type of acoustic transducer for its receiving sensitivity, transmitting response, and directivity measurement as per IEC60565 standard. The measurement results for RESON TC4034 and RESON TC 2080 transducers are presented and the results show that the system is able to carry out accurate calibration and characterization of any underwater acoustic transducer. Sources of uncertainty for calibration are also presented with the confidence level of approximately 95%.

The Application of RAKE Receiving Technology in the Underwater SS Communication

2014 ◽  
Vol 513-517 ◽  
pp. 4248-4252 ◽  
Author(s):  
Yun Hang Zhu ◽  
Zhi Hui Deng
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
High Reliability ◽  
Underwater Acoustic Communication ◽  
Technical Solution ◽  
Acoustic Transmission ◽  
Long Distance ◽  
Underwater Acoustic ◽  
Underwater Wireless Communication ◽  
Spreading Spectrum

In recent years, the strategic significance of the oceans is growing as well as its research and development needs. The underwater wireless communication is becoming more and more important. The underwater acoustic communication is one of the few mediums which can conduct the underwater transmission over a long distance, and the multipath effect is the major obstacle of affecting the systems high speed and high reliability. The characteristics of underwater acoustic fading and coherent multi-path channel are studied, and the model of underwater acoustic spreading spectrum (SS) communication system is established. The affect of coding technique on the systems performance are analyzed in detail. The improved RAKE receiving technical solution is put forward, whose simulation analysis and data in different combining ways are given. It is proved that the scheme can better solve the problem of multipath interference in underwater acoustic transmission.

Long-Distance Inspection of Pipes Using Electromagnetic Acoustic Transducer for Cylindrical Wave

2004 ◽  
Vol 270-273 ◽  
pp. 612-618 ◽  
Author(s):  
Riichi Murayama ◽  
Yoshiyuki Nakata ◽  
Yasuhiko Wakibe ◽  
Hideki Wada ◽  
Yukihisa Imagawa ◽  
...  
Keyword(s):  
Cylindrical Wave ◽  
Electromagnetic Acoustic Transducer ◽  
Long Distance ◽  
Acoustic Transducer
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