A small piezoelectric hydrophone resistant to high hydrostatic pressure and its manufacturing method

Abstract

The invention discloses a high hydrostatic pressure-resistant small piezoelectric hydrophone and a manufacturing method thereof. The small piezoelectric hydrophone comprises a high-strength polyurethane coating layer, a piezoelectric ceramic round tube, a flexible rubber plug, a locating ring and two fine wires, wherein the appearance of the piezoelectric ceramic round tube is cylindrical; the polarization direction of the piezoelectric ceramic round tube is radially polarized; a gap with the width of 1-2mm is reserved on the excircle surface electrode of the piezoelectric ceramic round tube; the excircle surface electrode is divided into two sections; the polarization directions of the two sections of the round tube are opposite; the excircle electrode plus a direct current forward voltage is a positive electrode of the hydrophone; an excircle electrode plus a direct current negative voltage is a negative electrode of the hydrophone; the inner circle surface of the piezoelectric ceramic round tube is a common electrode; the appearance structure of the piezoelectric ceramic round tube is an integrated round tube; the circuit is formed by connecting two sections of round tubes with opposite polarities in series; and the locating ring is fixed at the gap. The high hydrostatic pressure-resistant small piezoelectric hydrophone has the beneficial effects of simple and reliable structure, small size, waterproofness, oil resistance and stable performance.

Description

technical field [0001] The invention relates to a hydrophone, more specifically, it relates to a small piezoelectric hydrophone with high hydrostatic pressure resistance and a manufacturing method thereof. Background technique [0002] With the continuous advancement of marine seismic exploration technology, deep-sea long-distance engineering exploration and research have developed rapidly, and the exploration area has gradually extended from the coastal continental shelf to the depths of the ocean. Marine seismic exploration cables are currently an important technical means for obtaining seabed seismic data. Digital exploration cables come in various forms according to the constraints of tasks, sea areas and environmental conditions. Among them, deep-sea towed cables, submarine fixed cables and large-depth sonar arrays It is used for deep-sea exploration and research, and the operating depth can reach 500-4000 meters underwater. Under such environmental conditions, the max...

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Problems solved by technology

[0004] Chinese Patent 200510080342.X "Small Static Pressure-Resistant Hydrophone for Towed Line Array" describes a piezoelectric ceramic circular tube with two segmented electrodes in the tube, a shell, upper and lower end covers, a middle support ring, a sealing A hydrophone composed of glue, etc., two piezoelectric ceramic round tubes are arranged coaxially, the electrodes inside the round tubes are connected in series, and the structural parts and the piezoelectric round tubes are bonded with glue. This kind of hydrophone has good acoustic performance, and The performance can be adjusted according to the needs. However, the structure and manufacturing process of the hydrophone are relatively complicated. The key is that it cannot withstand high hydrostatic pressure and can only be used in a shallow sea environment with an operating depth of several meters to hundreds of meters.

[0005] In the Chinese patent CN86210266 "Segmented Electrode Circular Tube Hydrophone", a hydrophone with a combination of three segmented electrode piezoelectric circular tubes with different widths, an aluminum cover plate, a rubber washer, and a fixed screw is described. Relatively complex structure and process, suitable for measuring hydrophones, not suitable for cabling, and also unable to meet the use environment of large depth and high water pressure

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