Hubei Hannas Tech Co.,Ltd-Professional Piezoceramic Elements Supplier
News
You are here: Home / News / Ultrasonic Transducer information / Research Progress and Development Opportunities of Underwater Acoustic Transducer Technology(2

Research Progress and Development Opportunities of Underwater Acoustic Transducer Technology(2

Views: 1     Author: Site Editor     Publish Time: 2021-05-22      Origin: Site

Inquire

facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
sharethis sharing button

 Research progress of deep water transducers

 

Deep-sea space is the new commanding heights of current maritime military competition. One of my country's marine strategic goals is to move toward deep blue. The development of deep-sea acoustic equipment promotes continuous breakthroughs in deep-water transducer research. Among the low-frequency transducers introduced in section 1.1 of this article, the curved disc transducer and the tube-beam coupling ring transducer with overflow cavity structure are also design examples of deep-water transducers. I will not repeat them here, but introduce some typical ones. The new research results of deep-water transducers.

 

Figure 7a shows the two main Helmholtz underwater acoustic transducer structures using end excitation and intermediate excitation. Theoretical study of the resonance frequency of the liquid cavity under elastic wall conditions is carried out. Figure 7b shows the designed multi-cavity low frequency broadband transducer using overflow tube transducer as excitation source. The low-frequency and high-power Janus-Helmholtz transducer designed in Fig. 7c; it is also by extending the cavity cylinder of the Janus-Helmholtz transducer toward the front of the piston radiation, a new liquid cavity is formed at the mouth of the Janus radiator. The multi-cavity Janus-Helmholtz transducer (Figure 7d) enables the transducer to have a wider working frequency band. Figure 7e shows the designed overflow ring deepwater transducer for underwater acoustic communication. The design utilizes the coupling effect of liquid cavity resonance and circular ring radial vibration to achieve broadband operating characteristics. Figure 7f shows the designed half-space directivity of the overflow ring deep-water broadband transducer. The metal base is used to improve the vertical directivity of the transducer and suppress the rear radiation. The deep-water broadband longitudinal transducer designed in Figure 7g. The transducer uses the coupling of longitudinal vibration and front cover bending vibration to achieve broadband operation. The transducer is encapsulated in a titanium alloy pressure-resistant housing, and the housing and the transducer are filled with silicone oil. , Through the pressure balance device to achieve deep water work.

 

V9D_XGID1CMX9%JF%(H

Figure 7 Deepwater transducer


1.4 Research progress of vector hydrophone

With people's deep attention to the vector information of sound field and the importance of vector hydrophone research, vector hydrophone technology continues to develop and has become one of the international research hotspots in recent years. In the 21st century, my country's vector hydrophone application research is the most active. According to the statistical results at the end of 2014, nearly half of the academic achievements in the field of international vector hydrophones and their applications came from my country. Here is a brief introduction to the recent research progress of vector hydrophones.

 

The typical structure of a vector hydrophone is a co-mode. The co-mode vector hydrophone is made by encapsulating inertial sensitive elements (vibration accelerometers, speedometers, etc.) in a spherical  or cylindrical shell. Its working principle is based on the characteristics of a rigid sphere or cylinder that makes an oscillating motion under the action of a sound field, and is generally designed for zero buoyancy (Figure 8a). The theory and technology in this area are relatively mature. Nowadays, new types of piezoelectric single crystal materials PMNT and PZNT are used to reduce the volume of the hydrophone, increase the sensitivity, and reduce the self-noise. Vector hydrophones are mainly used in shore-based arrays, towed arrays, and side arrays. Low-frequency vector hydrophones are also used in marine environment noise measurement, submersible/buoy and other systems.


GR%AGEXCL_I7Q5Y9J


Figure 8 Vector hydrophone



Figure 8b is a co-vibrating column vector hydrophone that can be fixedly installed. Its basic principle has not changed. In the structure, the suspension frame is replaced by a mounting rod, and the suspension spring is changed to a rubber spring. The application scenario of this structure can be extended to fixed installation on the platform carrier.

 

With the development of micro-electromechanical processing technology (MEMS), MEMS technology has been applied to the design and development of vector hydrophones. MEMS technology can integrate microelectronic components such as sensitive units, control circuits, low-noise matching circuits, and sampling pre-processing modules. In one, the acoustic signal is converted into an electrical signal. A typical working mode is to use a micro-acceleration sensor as a sensitive element (Figure 8c), use the principle of piezoresistive effect of single crystal silicon to design a sensitive chip, and develop a 3-dimensional co-vibration cylindrical composite MEMS vector hydrophone. Another working mode is based on the principle of bionics, imitating the principle of the fish's lateral mechanical sensing cells to sense water movement, and designed a MEMS piezoresistive vector hydrophone (Figure 8d).

 

Optical fiber hydrophone is one of the successful applications of optical fiber sensing technology in the field of underwater acoustics. It shows the technical characteristics of high sensitivity, low noise, large dynamic range, and anti-interference. In recent years, it has also been widely used in vector hydrophones. Researchers have designed and developed a fiber optic vector hydrophone. Figure 8e is a three-dimensional cylindrical fiber optic vector hydrophone. Based on the Bragg grating, the acceleration sensing unit and the sound pressure sensing unit are designed, and the sound pressure-vibration velocity vector hydrophone is developed. Figure 8f is a 3D spherical fiber vector hydrophone. Based on the full polarization-maintaining fiber interference system, a 3D orthogonal mandrel interferometric fiber vector hydrophone has been developed, which has a compact structure and the sound center coincides at one point.

 

The research progress of low-frequency transducers, high-frequency broadband transducers, deep-water transducers, and vector hydrophones. Although the data collected is not exhaustive, it is quite typical and representative. It basically depicts The frontier outline of the development of my country's underwater acoustic transducers. Compared with the iconic innovation work on transducers in different periods in the world, a considerable part of the innovative design work in my country is several years or even more than ten years later than the international cutting-edge technology level.

 

The greatest impetus for the development of my country's hydroacoustic transducers comes from the application requirements in the field of hydroacoustic technology. In a period when my country’s economic strength and scientific and technological strength are relatively weak, this development method is the most effective, but after a long period of time, there will be obvious historical traces, resulting in unsystematic disciplines, incomplete product series, and theoretical foundations. The situation of unreliable, imperfect specialized technology, unsustainable professional support, and unstable talent team.

 

In terms of deep-water transducer technology, some major marine countries have already had many mature technologies and series of products in the 20th century. Some civil deep-sea acoustic equipment can also be exported to my country. However, the demand for deep-sea sonar technology in my country was still not strong until the end of the 20th century. Deepwater transducer technology was almost in a blank state at that time. In recent years, the country has increased its investment and paid attention to the research of basic theories and basic core devices. New achievements in the field of underwater acoustic transducers have been emerging, technical capabilities have been improved year by year, and technological progress has been remarkable. Some of the research results listed in the previous article are synchronized with the international frontier level, but the overall synchronization and comprehensive parallel development momentum is far from being formed, especially in the historically short and weak transducer technology directions and new technological achievements. It is only rare, and the product performance is still very weak.

 

 

 

 





Feedback
Hubei Hannas Tech Co.,Ltd  is a professional piezoelectric ceramics and ultrasonic transducer manufacturer, dedicated to ultrasonic technology and industrial applications.                                    
 

RECOMMEND

CONTACT US

Add: No.302 Innovation Agglomeration Zone, Chibi Avenu ,Chibi City, Xianning, Hubei Province,China
E-mail: sales@piezohannas.com
Tel: +86 07155272177
Phone: +86 +18986196674         
QQ: 1553242848 
Skype: live:mary_14398
​        
Copyright 2017  Hubei Hannas Tech Co.,Ltd All rights reserved. 
Products