Side-scan transducer based on arc-shaped piezoelectric composite material and preparation method of side-scan transducer

Abstract

The invention relates to a side scanning transducer based on an arc-shaped piezoelectric composite material, which comprises an arc-shaped sensitive element, a backing, a rear cover plate, an electrode lead, an output cable and a watertight layer, wherein the watertight layer is fixed on the rear cover plate, a closed cavity is formed between the watertight layer and the rear cover plate, the arc-shaped sensitive element, the backing and the electrode lead are arranged in the cavity. The sensing element is fixed in a groove in the middle of the backing, the backing is fixed on a base plate, the base plate is fixed in the middle of the rear cover plate, two end parts of the rear cover plate are respectively provided with a mounting hole, a cable hole is arranged beside the mounting hole in one end part, the mounting holes and the cable hole are communicated with the cavity. The inner arc surface and the outer arc surface of the sensitive element are respectively provided with a first shielding layer. According to the invention, the detection distance of the sonar is increased through the arc-shaped sensitive element; the anti-interference capability and the reliability of the sonar are effectively improved through the shielding layer; and the plurality of piezoelectric composite materials are combined and connected, so that the receiving sensitivity of the transducer is improved.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic transducers, in particular to a side-scan transducer based on an arc-shaped piezoelectric composite material and a preparation method thereof. Background technique [0002] Side-scan sonar, also known as side sonar or seabed geomorphology instrument, is a device that uses the principle of echo sounding to detect seabed landforms and underwater objects. The beam width of the side scan sonar along the direction of the flight line is very narrow, and the opening angle is generally less than 2° to ensure a higher resolution; the beam width perpendicular to the direction of the flight line is wider, and the opening angle is about 20°~60° to ensure a certain scan width. The side-scan transducer is the key device for side-scan sonar to transmit and receive sound waves, and its performance directly affects the detection capability of the sonar. The horizontal beam opening angle of the transd...

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Problems solved by technology

Since the beam opening angle of the transducer is inversely proportional to the size of the planar sensitive element, in order to ensure that the transducer has both a narrow horizontal beam opening angle and a large vertical beam opening angle, for the planar sensitive element , it must be designed as a slender strip, which leads to insufficient effective radiation area of ​​the side-scan transducer and low sending response (that is, insufficient radiation sound wave intensity), which seriously limits the detection distance of the side-scan sonar

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