Abstract
In order to meet the technical requirements of full ocean depth multibeam echo sounder, the underwater acoustic array must have the ability of wide coverage, broadband response, high sensitivity and high reliability. This paper presents a design of underwater acoustic array based on Mills cross configuration with separate transmitting and receiving units. The arrays have modules design, hence the beamwidth of the array can be adjusted according to particular installation requirements. The working frequency band of the arrays is between 10.5kHz to 13.5kHz, and the coverage angle can cover -71.6°~71.6°. The Integrated design is used to achieve a wide-angle beam coverage of the planar array, which combines the transducer and the sound baffle together to realize a wide directivity of the array elements. The longitudinal bending transducers are designed to meet the broadband requirements for the transmitting array, which are Tonpilz transducers with flexural radiating head. On the other hand, each element of the receiving array is composed of several hydrophones, which are connected in series to achieve high sensitivity. The double-layer watertight technology is also applied in our design, ensuring stable performance and long service life.
Highlights
Multibeam echo sounder, improved by the single beam echo sounder, can get hundreds or even thousands of sound intensity sample data within the measurement section, can implement full coverage measurement in the area
In order to meet the technical requirements of the full ocean depth multi-beam echo sonar, the underwater acoustic array must have the ability of wide coverage, broadband, high sensitivity and high reliability
This paper presents the design of an underwater acoustic array, which uses the Mills cross configuration with separate transmitting and receiving unites
Summary
Multibeam echo sounder, improved by the single beam echo sounder, can get hundreds or even thousands of sound intensity sample data within the measurement section, can implement full coverage measurement in the area. The maximum detection depth of different types of multibeam echo sounder ranges from 100 meters to 11,000 meters, among them, the technology of the full ocean depth multibeam echo sounder is the most complicated and the scale of it is the largest. In order to meet the technical requirements of the full ocean depth multi-beam echo sonar, the underwater acoustic array must have the ability of wide coverage, broadband, high sensitivity and high reliability. Considering the need for detection range and accuracy, the center frequency of the acoustic array is set to 12kHz with a bandwidth of 3kHz. This paper presents the design of an underwater acoustic array, which uses the Mills cross configuration with separate transmitting and receiving unites. The arrays have modules design, the beamwidth of the array can be adjusted according to particular installation requirements
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