A side-scan transducer based on arc-shaped piezoelectric composite material and its preparation method

Abstract

The invention relates to a side-scan transducer based on an arc-shaped piezoelectric composite material, including an arc-shaped sensitive element, a backing, a rear cover, an electrode lead, an output cable and a watertight layer, and the watertight layer is fixed on the The rear cover plate, and a closed cavity is formed between the rear cover plate, the arc-shaped sensitive element, the backing and the electrode lead are arranged in the cavity, and the sensitive element is fixed in the groove in the middle of the backing , the backing is fixed on the backing plate, the backing plate is fixed on the middle of the back cover, the two ends of the back cover are respectively provided with mounting holes, and a cable is provided beside the mounting hole at one end hole, the installation hole and the cable hole are all connected to the cavity, and the inner and outer arc surfaces of the sensitive element are provided with a first shielding layer; the present invention improves the detection of sonar through the arc-shaped sensitive element The shielding layer effectively improves the anti-interference ability and reliability of the sonar; the combined connection of several piezoelectric composite materials improves the receiving sensitivity of the transducer.

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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