A high sensitivity cymbal cylindrical tube hydrophone

Abstract

The application discloses a high-sensitivity Cymbal cylindrical hydrophone and belongs to the technical field of hydrophones. A piezoelectric material (1) is arranged between an upper Cymbal end cap (2) and a lower Cymbal end cap (3), the upper Cymbal end cap (2) and the lower Cymbal end cap (3) are connected with a pre-conditioning circuit (4) through signal lines (5) respectively, and the pre-conditioning circuit (4) is connected with an output signal cable (6). The piezoelectric material (1), the upper Cymbal end cap (2), the lower Cymbal end cap (3), the pre-conditioning circuit (4) and the signal lines (5) are wrapped in a water-tight sound-transparent layer (7), and the water-tight sound-transparent layer (7) penetrates out of the output signal cable (6). The application is used to improve the sensitivity of the existing cylindrical hydrophone and broaden the frequency band of the existing cylindrical hydrophone.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrophones, and particularly relates to a high-sensitivity Cymbal cylindrical hydrophone. BACKGROUND

[0002] Sound wave is the only information carrier known to mankind that can achieve long-distance propagation in the ocean. A hydrophone is a main device for obtaining underwater acoustic signals and is an indispensable important component in a sonar system, among which a sound pressure hydrophone is most commonly used. The working principle of the sound pressure hydrophone is to produce a voltage output proportional to sound pressure by detecting the pulsation change of underwater sound pressure. According to different sensitive materials used, the hydrophone can be generally divided into: a piezoelectric ceramic hydrophone, a PVDF hydrophone, a piezoelectric composite material hydrophone and an optical fiber hydrophone. The piezoelectric hydrophone detects sound pressure by using the positive piezoelectric effect of piezoelectric materials. As a kind of sensor most commonly used for obtaining sound pressure signals in dynamic testing, the piezoelectric hydrophone has the advantages of high sensitivity, wide working frequency band, high signal-to-noise ratio, small size, simple structure and stable and reliable working, and has become the most widely used type at present. The hydrophone is widely used in many fields such as ocean environment monitoring, ocean resource development and ocean exploration. With the development demand of the field of underwater acoustics, low frequency, small size, high sensitivity and wide band characteristics have become the future development direction of the hydrophone.

[0003] As a kind of most commonly used hydrophone structure, the piezoelectric cylindrical tube has the advantages of wide frequency band and stable performance, and has become a reference structure form of various general-purpose hydrophones. However, the sensitivity of the structure form is low, which limits its application scenarios.

[0004] The Cymbal structure can amplify the radial displacement acting on the piezoelectric ceramic and couple it with the axial displacement to produce greater strain. Combined with the anisotropy and piezoelectricity of the piezoelectric ceramic, a higher voltage can be outputted, higher sensitivity can be obtained, and the bandwidth can be expanded to a certain extent. At the same time, the Cymbal structure transducer also has the advantages of miniaturization, low frequency and simple structure, and has been applied in the performance optimization of underwater acoustic transducers. SUMMARY

[0005] The application provides a high-sensitivity Cymbal cylindrical hydrophone, which is used to improve the sensitivity of the existing cylindrical hydrophone and widen the frequency band of the existing cylindrical hydrophone.

[0006] The application is implemented by the following technical scheme:

[0007] A high-sensitivity Cymbal cylindrical hydrophone, the hydrophone comprises a piezoelectric material 1, an upper Cymbal end cap 2, a lower Cymbal end cap 3, a pre-conditioning circuit 4, a signal line 5, an output signal cable 6 and a water-tight sound-transparent layer 7.

[0008] The piezoelectric material 1 converts sound waves into electrical signals through the piezoelectric effect;

[0009] The upper Cymbal cap 2 and the lower Cymbal cap 3 are used together to amplify the radial displacement acting on the piezoelectric material 1 and couple it with the axial displacement to generate greater strain and expand the bandwidth.

[0010] The pre-conditioning circuit 4 is used to improve the signal-to-noise ratio and enhance anti-interference capability;

[0011] The signal line 5 is used to transmit the electrical signal output by the piezoelectric material to the pre-conditioning circuit 4;

[0012] The output signal cable 6 is used to transmit the output signal of the acoustic pressure hydrophone;

[0013] The watertight acoustic layer 7 is used to provide watertight protection to ensure that sound waves can be transmitted into the piezoelectric material 1 with no attenuation or low attenuation.

[0014] A piezoelectric material 1 is disposed between the upper Cymbal cap 2 and the lower Cymbal cap 3. The upper Cymbal cap 2 and the lower Cymbal cap 3 are respectively connected to the pre-conditioning circuit 4 through signal lines 5. The pre-conditioning circuit 4 is connected to the output signal cable 6.

[0015] The piezoelectric material 1, the upper Cymbal cap 2, the lower Cymbal cap 3, the pre-conditioning circuit 4, and the signal line 5 are all wrapped in a watertight acoustic layer 7, through which the output signal cable 6 extends.

[0016] Furthermore, a piezoelectric material 1 is disposed between the upper Cymbal end cap 2 and the lower Cymbal end cap 3 to form a piezoelectric unit.

[0017] Furthermore, when multiple piezoelectric units are connected in series, the series lead wire method for the electrodes is to arrange the electrodes of the two piezoelectric materials 1 in the same order and then lead them out.

[0018] Furthermore, all the upper Cymbal caps 2 are connected in series, all the lower Cymbal caps 3 are connected in series, and the upper Cymbal cap 2 of the last piezoelectric unit and the lower Cymbal cap 3 of the last piezoelectric unit are respectively connected to the pre-conditioning circuit 4.

[0019] Furthermore, when multiple piezoelectric units are connected in parallel, the parallel lead wire method for the electrodes is to arrange the electrodes of the two piezoelectric materials 1 in opposite order and then lead them out.

[0020] Furthermore, the lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are arranged opposite to each other. The lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting wire.

[0021] The upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second intermediate piezoelectric unit are arranged opposite to each other; the upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second intermediate piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting wire.

[0022] Furthermore, the upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second piezoelectric unit are arranged opposite each other. The upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting line.

[0023] The lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are arranged opposite to each other; the lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting wire.

[0024] Furthermore, the smaller the top angle of the upper Cymbal cap 2 and the lower Cymbal cap 3, the greater the stiffness and the higher the resonant frequency.

[0025] A method for operating a high-sensitivity Cymbal tube hydrophone, wherein the method uses the high-sensitivity Cymbal tube hydrophone as described above, and the method specifically involves the piezoelectric material 1 receiving sound waves in the water and generating an electrical response through the piezoelectric effect. The improved upper Cymbal cap 2 and lower Cymbal cap 3 amplify the electrical response and transmit it through the signal line 5 to the pre-conditioning circuit 4, which outputs an electrical response signal with low output impedance, high output signal-to-noise ratio and strong anti-interference ability, and outputs it through the output signal cable 6.

[0026] One application of the high-sensitivity Cymbal tube hydrophone described above is in complex underwater environments, achieving greater sensitivity than the traditional flat-end cap.

[0027] The beneficial effects of this invention are:

[0028] This invention has a wider bandwidth and higher sensitivity, making it a superior piezoelectric hydrophone with a wider range of applications. It also has a simple structure, is easy to miniaturize, and is beneficial for arraying.

[0029] The Cymbal hydrophone of this invention combines the advantages of the Cymbal structure to improve sensitivity and expand bandwidth, providing support for high-performance sensors required by various underwater acoustic devices and further optimizing traditional cylindrical hydrophones. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a traditional round tube hydrophone.

[0031] Figure 2 This is a schematic diagram of a Cymbal structure hydrophone based on a piezoelectric unit of the present invention.

[0032] Figure 3 This is a schematic diagram of the Cymbal structure hydrophone with two piezoelectric units according to the present invention.

[0033] Figure 4 These are schematic diagrams of three different end caps, where (a) is a traditional cylindrical hydrophone end cap, (b) is a typical Cymbal structure end cap, and (c) is an improved Cymbal structure hydrophone end cap.

[0034] Figure 5 This is a schematic diagram of a traditional hydrophone model.

[0035] Figure 6 This is a schematic diagram of the Cymbal hydrophone model of the present invention.

[0036] Figure 7 This is a comparison chart of the sound pressure sensitivity of a traditional circular tube hydrophone and a Cymbal circular tube hydrophone.

[0037] Figure 8 This is a comparison diagram of the sound pressure sensitivity of longitudinal polarization and radial polarization in this invention.

[0038] Figure 9 This is a schematic diagram of the series leads of the electrodes of the present invention.

[0039] Figure 10 This is a schematic diagram of the parallel leads of the electrodes of the present invention. Detailed Implementation

[0040] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.

[0041] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0042] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] The following is in conjunction with the appendix to this application specification. Figures 1-10 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0045] Implementation Method 1

[0046] This embodiment provides a high-sensitivity Cymbal tube hydrophone, such as Figure 2 As shown, the hydrophone includes a piezoelectric material 1, an upper Cymbal cap 2, a lower Cymbal cap 3, a pre-conditioning circuit 4, a signal line 5, an output signal cable 6, and a watertight sound-permeable layer 7.

[0047] The piezoelectric material 1 converts sound waves into electrical signals through the piezoelectric effect; it can be piezoelectric ceramics, relaxor ferroelectric single crystals, or piezoelectric composite materials. The piezoelectric ceramics can be PZT-5A, PZT-5H, or PZT-8, etc., with the polarization direction being radial, longitudinal, or tangential; the relaxor ferroelectric single crystals can be binary PMN-PT or ternary PIN-PMN-PT materials, with the cut shape selectable as

[001] or

[011] , and the polarization direction selectable as radial or tangential, but the material itself has a low Curie temperature and is not easy to process into a circular tube shape, making it difficult to implement in engineering.

[0048] The upper Cymbal cap 2 and the lower Cymbal cap 3 are used together to amplify the radial displacement acting on the piezoelectric material 1 and couple it with the axial displacement to generate greater strain and expand the bandwidth. For improved Cymbal caps, a metal material is generally used. Figure 4 The images show (a) a traditional cylindrical hydrophone end cap, (b) a typical Cymbal structure end cap, and (c) an improved Cymbal structure hydrophone end cap. Compared to... Figure 4 (c) Improved Cymbal structure hydrophone end cap, Figure 4 (b) Typical Cymbal end caps are widely used because they are easier to manufacture. Figure 4 (b) The typical Cymbal structure end cap amplifies the radial displacement acting on the piezoelectric ceramic and couples it with the axial displacement to generate greater strain. Combined with the anisotropic electrical and elastic characteristics of the piezoelectric ceramic, it can output higher voltage, obtain higher sensitivity, and expand the bandwidth to a certain extent.

[0049] Figure 4 (c) The advantage of the improved Cymbal structure hydrophone end cap is that it has a larger area for receiving acoustic vibrations, which is more conducive to increasing the hydrophone's response, and the curved surface avoids stress concentration.

[0050] The pre-conditioning circuit 4 may include a pre-amplifier module and a filter module. Its functions are: first, to improve the signal-to-noise ratio, which facilitates long-distance transmission and makes the acoustic pressure hydrophone have low output impedance and high output signal-to-noise ratio, making it easy to match with the back end; and second, to improve the anti-interference capability.

[0051] The signal line 5 is a signal line connecting the piezoelectric material 1 to the pre-conditioning circuit 4, used to transmit the electrical signal output by the piezoelectric material 1 to the pre-conditioning circuit 4 for conditioning.

[0052] The output signal cable 6 is the output cable of the pre-conditioning circuit 4; it is used to transmit the output signal of the acoustic hydrophone. Low noise cable is used and electrical shielding is applied to the outside of the signal line to improve anti-interference capability.

[0053] The watertight sound-permeable layer 7 serves two purposes: first, to provide watertight protection for the piezoelectric material 1; and second, to ensure that sound waves can be transmitted into the piezoelectric material 1 with little or no attenuation. It is generally obtained by encapsulating waterproof and sound-permeable materials such as epoxy resin and polyurethane in a mold.

[0054] A piezoelectric material 1 is disposed between the upper Cymbal cap 2 and the lower Cymbal cap 3. The upper Cymbal cap 2 and the lower Cymbal cap 3 are respectively connected to the pre-conditioning circuit 4 through signal lines 5. The pre-conditioning circuit 4 is connected to the output signal cable 6.

[0055] The piezoelectric material 1, the upper Cymbal cap 2, the lower Cymbal cap 3, the pre-conditioning circuit 4, and the signal line 5 are all wrapped in a watertight acoustic layer 7, through which the output signal cable 6 extends.

[0056] Furthermore, a piezoelectric material 1 is disposed between the upper Cymbal end cap 2 and the lower Cymbal end cap 3 to form a piezoelectric unit.

[0057] Furthermore, when multiple piezoelectric units are connected in series, such as Figure 9 As shown, the series lead-out method of the electrodes is to arrange the electrodes of the two piezoelectric materials 1 in a phase-series order and then lead them out.

[0058] Furthermore, all the upper Cymbal caps 2 are connected in series, all the lower Cymbal caps 3 are connected in series, and the upper Cymbal cap 2 of the last piezoelectric unit and the lower Cymbal cap 3 of the last piezoelectric unit are respectively connected to the pre-conditioning circuit 4.

[0059] Furthermore, when multiple piezoelectric units are connected in parallel, such as Figure 10 As shown, the parallel lead method of the electrodes is to arrange the electrodes of the two piezoelectric materials 1 in opposite order and then lead them out.

[0060] Furthermore, the lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are arranged opposite to each other. The lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting wire.

[0061] The upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second intermediate piezoelectric unit are arranged opposite to each other; the upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second intermediate piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting wire.

[0062] Furthermore, the upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second piezoelectric unit are arranged opposite each other. The upper Cymbal cap 2 of the first piezoelectric unit and the upper Cymbal cap 2 of the second piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting line.

[0063] The lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are arranged opposite to each other; the lower Cymbal cap 3 of the first piezoelectric unit and the lower Cymbal cap 3 of the second intermediate piezoelectric unit are connected together and then connected to the pre-conditioning circuit 4 by an external connecting wire.

[0064] Furthermore, the smaller the top angle of the upper Cymbal cap 2 and the lower Cymbal cap 3, the greater the stiffness and the higher the resonant frequency. The angle can be designed according to the actual operating frequency band.

[0065] Traditional cylindrical hydrophones typically employ radial polarization, but radial polarization is not always suitable for Cymbal cylindrical hydrophones. Without changing other parameters, only altering the polarization direction of the piezoelectric tube, the sensitivity curves of Cymbal cylindrical hydrophones with two different polarization methods are simulated as follows: Figure 8 As shown in the comparison chart, it can be seen that the sensitivity of longitudinal polarization is much higher than that of radial polarization. Therefore, longitudinal polarization has advantages.

[0066] To illustrate the effectiveness of this invention, the performance of a traditional circular tube hydrophone and a Cymbal circular tube hydrophone were compared. Finite element simulation was used to model and analyze the two structures separately. Figure 5 Figures 6 and 7 show half-section views of a traditional end-cap hydrophone and a Cymbal tube hydrophone, respectively. The structural dimensions, materials, and end-cap thickness of the piezoelectric tube were controlled, with the materials remaining consistent; only the end-cap shape was changed. Both employed longitudinal polarization and constant external pressure. Changing the frequency yielded the sound pressure sensitivity curves for both hydrophones, as shown in the comparison diagram. Figure 7 As shown in the comparison chart, it can be seen that the Cymbal tube hydrophone has a sensitivity of about 5dB higher than that of the traditional tube hydrophone in the operating frequency band, and its resonant frequency is also much higher than that of the traditional tube hydrophone. The broadband characteristics increase its application range and usage scenarios, and it also has advantages for broadband arrays.

[0067] The piezoelectric material 1 is a piezoelectric tube.

[0068] Figure 3The cylindrical Cymbal hydrophone with two piezoelectric units shown is first made by bonding the two piezoelectric tubes to their upper Cymbal caps 2 and lower Cymbal caps 3 respectively with epoxy adhesive. After curing, the two piezoelectric tubes are bonded together top to bottom with conductive adhesive. The electrodes of the two piezoelectric tubes are connected in opposite order. Then, the upper and lower positive electrodes are connected with signal lines 5. The negative electrode line is led out from the conductive adhesive and connected to the pre-conditioning circuit 4. The signal cable 6 is led out from the pre-conditioning circuit 4. The signal line is shielded. The connected parts are placed in a mold. Finally, polyurethane with good sound transmission and seawater corrosion resistance is selected as the watertight sound-transmitting layer 7 for potting.

[0069] Figure 3 The electrode leads of the dual piezoelectric tube shown have two connection methods, namely: Figure 9 , Figure 10 As shown, Figure 9 The electrode series connection method shown involves arranging two piezoelectric cylindrical electrodes in the same order and then leading them out. Figure 10 The parallel lead method shown is to arrange the two piezoelectric circular tube electrodes in opposite order and then lead them out.

[0070] When two piezoelectric tubes are connected in series, their output voltage is large and their capacitance is small, making them suitable for applications requiring high voltage output. When two piezoelectric tubes are connected in parallel, their output charge is large and their capacitance is large, making them suitable for applications requiring high charge output.

[0071] Implementation Method 2

[0072] This embodiment provides a working method for a high-sensitivity Cymbal tube hydrophone as described in Embodiment 1. Specifically, the piezoelectric material 1 receives sound waves in the water and generates an electrical response through the piezoelectric effect. The improved upper Cymbal cap 2 and lower Cymbal cap 3 amplify the electrical response and transmit it to the pre-conditioning circuit 4 through the signal line 5. The circuit outputs an electrical response signal with low output impedance, high output signal-to-noise ratio, and strong anti-interference capability, and outputs it through the output signal cable 6.

[0073] Implementation Method 3

[0074] This embodiment provides a piezoelectric hydroacoustic sensor for acquiring sound pressure signals in complex underwater environments, as described in Embodiment 1, achieving greater sensitivity than the traditional flat-end cap.

Claims

1. A high-sensitivity Cymbal tube hydrophone, characterized in that, The hydrophone includes a piezoelectric material (1), an upper Cymbal cap (2), a lower Cymbal cap (3), a pre-conditioning circuit (4), a signal line (5), an output signal cable (6), and a watertight sound-permeable layer (7). The piezoelectric material (1) converts sound waves into electrical signals through the piezoelectric effect; The upper Cymbal cap (2) and the lower Cymbal cap (3) are used together to amplify the radial displacement acting on the piezoelectric material (1) and couple it with the axial displacement to generate greater strain and expand the bandwidth. The pre-conditioning circuit (4) is used to improve the signal-to-noise ratio and enhance anti-interference capability; The signal line (5) is used to transmit the electrical signal output by the piezoelectric material to the pre-conditioning circuit (4); The output signal cable (6) is used to transmit the output signal of the acoustic hydrophone; The watertight acoustic layer (7) is used to provide watertight protection to ensure that sound waves can be transmitted into the piezoelectric material (1) with no attenuation or low attenuation. A piezoelectric material (1) is provided between the upper Cymbal cap (2) and the lower Cymbal cap (3). The upper Cymbal cap (2) and the lower Cymbal cap (3) are respectively connected to the pre-conditioning circuit (4) through signal lines (5). The pre-conditioning circuit (4) is connected to the output signal cable (6). The piezoelectric material (1), upper Cymbal cap (2), lower Cymbal cap (3), pre-conditioning circuit (4) and signal line (5) are all wrapped in a watertight sound-permeable layer (7), and the output signal cable (6) extends out of the watertight sound-permeable layer (7). The smaller the top angle of the upper Cymbal cap (2) and the lower Cymbal cap (3), the greater the stiffness and the higher the resonant frequency.

2. The hydrophone according to claim 1, characterized in that, A piezoelectric material (1) is provided between the upper Cymbal cap (2) and the lower Cymbal cap (3) to form a piezoelectric unit.

3. The hydrophone according to claim 2, characterized in that, When multiple piezoelectric units are connected in series, the series lead wire method of the electrodes is to arrange the electrodes of the two piezoelectric materials (1) in the same order and then lead them out.

4. The hydrophone according to claim 3, characterized in that, All the upper Cymbal caps (2) are connected in series, all the lower Cymbal caps (3) are connected in series, and the upper Cymbal cap (2) of the last piezoelectric unit and the lower Cymbal cap (3) of the last piezoelectric unit are respectively connected to the pre-conditioning circuit (4).

5. The hydrophone according to claim 2, characterized in that, When multiple piezoelectric units are connected in parallel, the parallel lead wire method of the electrodes is to arrange the electrodes of the two piezoelectric materials (1) in opposite order and then lead them out.

6. The hydrophone according to claim 5, characterized in that, The lower Cymbal cap (3) of the first piezoelectric unit is positioned opposite to the lower Cymbal cap (3) of the second piezoelectric unit. The lower Cymbal cap (3) of the first piezoelectric unit and the lower Cymbal cap (3) of the second piezoelectric unit are connected together and then connected to the pre-conditioning circuit (4) by an external connecting line. The upper Cymbal cap (2) of the first piezoelectric unit is set opposite to the upper Cymbal cap (2) of the second piezoelectric unit; the upper Cymbal cap (2) of the first piezoelectric unit and the upper Cymbal cap (2) of the second piezoelectric unit are connected together and then connected to the pre-conditioning circuit (4) by an external connecting line.

7. The hydrophone according to claim 5, characterized in that, Alternatively, the upper Cymbal cap (2) of the first piezoelectric unit and the upper Cymbal cap (2) of the second piezoelectric unit are arranged opposite to each other. The upper Cymbal cap (2) of the first piezoelectric unit and the upper Cymbal cap (2) of the second piezoelectric unit are connected together and then connected to the pre-conditioning circuit (4) by an external connecting line. The lower Cymbal cap (3) of the first piezoelectric unit is positioned opposite to the lower Cymbal cap (3) of the second piezoelectric unit; the lower Cymbal cap (3) of the first piezoelectric unit and the lower Cymbal cap (3) of the second piezoelectric unit are connected together and then connected to the pre-conditioning circuit (4) by an external connecting wire.

8. A method for operating a high-sensitivity Cymbal tube hydrophone, characterized in that, The working method uses a high-sensitivity Cymbal tube hydrophone as described in any one of claims 1-7. Specifically, the piezoelectric material (1) receives sound waves in the water and generates an electrical response through the piezoelectric effect. The improved upper Cymbal cap (2) and lower Cymbal cap (3) amplify the electrical response and transmit it to the pre-conditioning circuit (4) through the signal line (5). The circuit outputs an electrical response signal with low output impedance, high output signal-to-noise ratio and strong anti-interference ability, and outputs it through the output signal cable (6).

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