Underwater sonic sensor

Abstract

The utility model discloses an underwater acoustic wave sensor, and relates to the technical field of underwater acoustic wave sensors, the underwater acoustic wave sensor comprises a housing, a piezoelectric assembly and an amplification module, the housing is provided with an accommodating cavity, and a signal lead-in hole and a mounting hole which are communicated with the accommodating cavity; the piezoelectric assembly is arranged in the containing cavity, abuts against the signal leading-in hole in a sealed mode and is used for receiving the sound wave signals through the signal leading-in hole, converting the sound wave signals into electric signals and outputting the electric signals; one end of the amplification module extends into the accommodating cavity and is electrically connected with the piezoelectric assembly, the other end of the amplification module extends out of the shell through the mounting hole and is used for being electrically connected with a terminal, and the amplification module is used for receiving an electric signal, amplifying the electric signal and outputting the amplified electric signal to the terminal. The technical scheme of the utility model can solve the problem that there is no underwater sensor for deep well casting molten aluminum leakage detection, and the hydrophone is easy to damage and place.

Description

TECHNICAL FIELD

[0001] The utility model relates to underwater acoustic wave sensor field especially relates to a kind of underwater acoustic wave sensors. BACKGROUND

[0002] In the production process of aluminum bar aluminum ingot, aluminum liquid needs to be introduced into forming mold for deep well casting type leakage detection. After the mixing of high-temperature aluminum liquid and water, due to the large temperature difference between the two-phase fluid, rapid heat exchange occurs between the two-phase fluid, causing a large amount of liquid water to overheat and vaporize into nuclei. When the energy of the high-temperature and high-pressure water vapor accumulates to a certain high-energy density state, the water vapor will expand sharply, causing a violent steam explosion. Therefore, it is necessary to detect the initial leakage of aluminum liquid. At present, there is no sensor for deep well casting detection on the market, mainly relying on manual inspection for detection, which may cause detection blind spots and delayed response. There is also a hydrophone scheme for replacement, but this type of sensor has a narrow frequency response bandwidth and is prone to damage, so it is shelved. SUMMARY

[0003] The main purpose of the utility model is to provide an underwater acoustic wave sensor, which solves the problem of no underwater sensor for deep well casting aluminum liquid leakage detection and the problem of easy damage and shelving of hydrophone.

[0004] To achieve the above purpose, the underwater acoustic wave sensor provided by the utility model comprises:

[0005] The shell is provided with a receiving cavity, a signal introduction hole and a mounting hole communicating with the receiving cavity;

[0006] The piezoelectric component is arranged in the receiving cavity and abuts and seals the signal introduction hole. The piezoelectric component is used to receive acoustic wave signals through the signal introduction hole and convert them into electrical signals for output.

[0007] The amplification module has one end extending into the receiving cavity and electrically connected with the piezoelectric component, and the other end extending out of the shell through the mounting hole and electrically connected with a terminal. The amplification module is used to receive the electrical signals and amplify them for output to the terminal.

[0008] In an embodiment, the piezoelectric component comprises:

[0009] The coupling piece abuts and seals the signal introduction hole. The coupling piece is provided with a mounting cavity. The coupling piece is used to receive acoustic wave signals transmitted by the signal introduction hole and output them.

[0010] The piezoelectric piece is arranged in the mounting cavity and electrically connected with the coupling piece and the amplification module. The piezoelectric piece is used to receive the acoustic wave signals and convert them into electrical signals for output to the amplification module.

[0011] In an embodiment, the coupling member comprises a first coupling portion and a second coupling portion, at least one of the first coupling portion and the second coupling portion is sealed against the signal lead-in hole, the first coupling portion and the second coupling portion are insertedly fitted to enclose a mounting cavity accommodating the piezoelectric component.

[0012] In an embodiment, the coupling member is made of metal material.

[0013] Alternatively, the coupling member is made of thermoplastic material.

[0014] In an embodiment, the amplification module comprises:

[0015] an amplifier disposed in the accommodating cavity, the amplifier is electrically connected to the piezoelectric component, the amplifier is configured to receive the electrical signal and output the amplified electrical signal.

[0016] a conductive member fixedly and electrically connected to the amplifier, the conductive member extends out of the housing from the mounting hole for electrical connection to a terminal, the conductive member is configured to output the amplified electrical signal to the terminal.

[0017] In an embodiment, the housing comprises a housing body and a cover, the housing body and the cover are connected to enclose the accommodating cavity, the cover is provided with the mounting hole.

[0018] In an embodiment, the signal lead-in hole comprises a first hole section and a second hole section in communication with each other, the first hole section is disposed close to the piezoelectric component, the piezoelectric component is sealed against the first hole section, the first hole section has a smaller hole diameter than the second hole section.

[0019] In an embodiment, the hole diameter of the second hole section is tapered towards the first hole section.

[0020] In an embodiment, the accommodating cavity of the housing is filled with a thermal insulation body.

[0021] In an embodiment, the housing is provided with a fixing member, the fixing member is configured to fix the underwater acoustic wave sensor to a position to be measured.

[0022] The technical scheme of the underwater acoustic wave sensor is applied to deep well casting molten aluminum leakage detection, when high-temperature molten aluminum leaks and meets cooling water, a large amount of steam bubbles are generated due to rapid heat exchange caused by temperature difference, and acoustic wave signals in a specific frequency range are accompanied, the acoustic wave signals are transmitted to the underwater acoustic wave sensor through a water medium, are transmitted to the piezoelectric component through the signal introduction hole of the shell, the piezoelectric component senses the vibration caused by the acoustic wave, and converts mechanical energy (acoustic wave) into an electric signal according to the piezoelectric effect, the generated electric signal is usually very weak, and therefore needs to be enhanced through the amplification module, the amplified signal can be transmitted to the terminal through the amplification module, the terminal analyzes and processes the received signal, once an abnormal acoustic wave signal is detected, an alarm can be triggered or other preventive measures can be taken, thereby realizing effective detection of molten aluminum leakage, compared with a traditional manual inspection mode, the molten aluminum leakage condition can be continuously detected, instant feedback is provided, delay caused by a time interval of manual inspection is avoided, and the sensor based on the piezoelectric effect can capture extremely subtle acoustic wave changes, the sensitivity and accuracy of detection are improved, and the possibility of misjudgment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principle of the present application.

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structure schematic diagram of the underwater acoustic wave sensor provided by the present application is shown.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 100, underwater acoustic wave sensor; 1, shell; 101, accommodating cavity; 102, signal introduction hole; 1021, first hole section; 1022, second hole section; 11, shell body; 12, cover body; 103, mounting hole; 2, piezoelectric component; 201, mounting cavity; 21, coupling piece; 211, first coupling part; 212, second coupling part; 22, piezoelectric piece; 3, amplification module; 31, amplifier; 32, conductive piece; 4, heat insulating body; 5, fixing piece.

[0028] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0030] In the production process of aluminum bars and ingots, the molten aluminum needs to be introduced into a forming mold for deep-well casting type leakage detection. After the high-temperature molten aluminum is mixed with water, due to the large temperature difference between the two-phase fluids, rapid heat exchange occurs between the two-phase fluids, causing a large amount of liquid water to be superheated and vaporized into nuclei. When the energy of the high-temperature and high-pressure water vapor accumulates to a certain high-energy density state, the water vapor will expand sharply, causing a violent steam explosion. Therefore, it is necessary to detect the initial leakage of the molten aluminum. At present, there is no sensor for deep-well casting detection on the market, and detection mainly relies on manual inspection, which may cause detection blind spots and untimely response. There is also a water detector scheme, but such sensors have a narrow frequency response bandwidth and are prone to damage, so they are shelved.

[0031] The utility model provides a kind of underwater acoustic sensor, to solve the problem that deep-well casting molten aluminum leakage detection has no underwater sensor, and hydrophone is prone to damage and shelved.

[0032] In an embodiment of the utility model, refer to Figure 1 The underwater acoustic sensor comprises:

[0033] The shell 1 is provided with a containing cavity 101, a signal introduction hole 102 and a mounting hole 103 communicating with the containing cavity 101;

[0034] The piezoelectric component 2 is arranged in the containing cavity 101 and abuts and seals the signal introduction hole 102, and the piezoelectric component 2 is used to receive acoustic signals via the signal introduction hole 102 and convert them into electrical signals and then output;

[0035] One end of the amplification module 3 is inserted into the containing cavity 101 and electrically connected to the piezoelectric component 2, and the other end of the amplification module 3 is extended out of the shell 1 via the mounting hole 103 and electrically connected to the terminal, and the amplification module 3 is used to receive the electrical signals and amplify them before outputting to the terminal.

[0036] In this embodiment, the shell 1 provides protection and structural support for the entire underwater acoustic sensor 100, and is internally provided with a receiving cavity 101 for accommodating the main components of the sensor. In addition, the shell 1 is provided with a signal introduction hole 102 and a mounting hole 103, the signal introduction hole 102 allows external sound waves to enter and contact the piezoelectric component 2, and the mounting hole 103 is used to fix the amplification module 3 and make it partially extend out of the shell 1.

[0037] The piezoelectric component 2 is the core component of the underwater acoustic sensor 100, which is located in the receiving cavity 101 of the shell 1 and is in close sealing contact with the signal introduction hole 102. The piezoelectric component 2 has special physical properties, that is, when subjected to mechanical stress (such as pressure changes of sound waves), it will produce charge separation and thus produce an electric signal. Therefore, the piezoelectric component 2 can receive the sound wave signal transmitted through the signal introduction hole 102 and convert it into a corresponding electric signal. It is worth noting that the strain range of the piezoelectric component 2 can reach 200HZ-200KHZ, which can capture the sound wave signal in a specific frequency range generated by the aluminum liquid leakage encountering water, ensuring effective detection of early leakage.

[0038] One end of the amplification module 3 extends into the shell 1 and is electrically connected with the piezoelectric component 2, and the other end extends to the outside of the shell 1 through the mounting hole 103, and its main function is to amplify the weak electric signal generated by the piezoelectric component 2, so as to facilitate subsequent data transmission or further processing. The design of the amplification module 3 can ensure that the quality of the signal will not be lost too much when transmitted from the underwater environment to the water surface.

[0039] The technical scheme of the underwater acoustic wave sensor 100 is applied to deep well casting molten aluminum leakage detection, when high-temperature molten aluminum leaks and meets cooling water, due to temperature difference leading to rapid heat exchange, a large amount of steam bubbles will be generated, accompanied by acoustic wave signals in a specific frequency range (such as 2KHZ~40KHZ), these acoustic wave signals will be transmitted to the underwater acoustic wave sensor 100 through the water medium, transmitted to the piezoelectric component 2 through the signal introduction hole 102 of the shell 1, the piezoelectric component 2 senses the vibration caused by these acoustic waves, and converts mechanical energy (acoustic waves) into electrical signals according to the piezoelectric effect, the generated electrical signals are usually very weak, and therefore need to be enhanced through an amplification module, the amplified signals can be transmitted to the terminal through the amplification module 3, the terminal analyzes and processes the received signals, once an abnormal acoustic wave signal is detected, an alarm can be triggered or other preventive measures can be taken, thereby realizing effective detection of molten aluminum leakage, compared with the traditional manual inspection mode, the molten aluminum leakage situation can be continuously detected, instant feedback is provided, the delay caused by the time interval of manual inspection is avoided, and the sensor based on the piezoelectric effect can capture extremely subtle acoustic wave changes, improve the sensitivity and accuracy of detection, and reduce the possibility of misjudgment. The technical scheme of the utility model can be used in an environment with a temperature of not more than 125 DEG C and a water pressure of not more than 300Mpa, and does not need additional complex processes, can be applied to more small, complex, closed and high-temperature environments, and can also be used for abnormal detection of nuclear power cooling water tanks.

[0040] In an embodiment of the utility model, referring to Figure 1 , the piezoelectric component 2 includes:

[0041] The coupling piece 21 is abutted and sealed to the signal introduction hole 102, the coupling piece 21 is provided with a mounting cavity 201, and the coupling piece 21 is used for receiving acoustic wave signals transmitted by the signal introduction hole 102 and outputting;

[0042] The piezoelectric piece 22 is arranged in the mounting cavity 201 and is electrically connected with the coupling piece 21 and the amplification module 3, and the piezoelectric piece 22 is used for receiving the acoustic wave signals and converting the acoustic wave signals into electrical signals and then outputting the electrical signals to the amplification module 3.

[0043] In the embodiment, the coupling member 21 is located between the signal introduction hole 102 and the piezoelectric member 22, directly abutting and sealing the signal introduction hole 102, and mainly functions to ensure that the sound waves transmitted from the outside can be effectively transmitted to the piezoelectric member 22, while maintaining good waterproof sealing. The coupling member 21 is internally provided with a mounting cavity 201 for accommodating the piezoelectric member 22, which not only provides physical support for the piezoelectric member 22, but also optimizes the energy transmission path of the sound waves from the coupling member 21 to the piezoelectric member 22. The piezoelectric member 22 is located in the mounting cavity 201 of the coupling member 21 and is electrically connected with the coupling member 21 and the amplification module 3, for receiving the sound wave signals output by the coupling member 21 and converting them into electrical signals. In actual application, the sound wave signals generated by the high-temperature aluminum leakage when encountering water enter the sensor through the signal introduction hole 102, are first received by the coupling member 21, and then transmitted to the piezoelectric member 22. Due to the piezoelectric effect of the piezoelectric member 22, the mechanical vibration (i.e. sound waves) received is converted into an electrical signal. The amplification module 3 amplifies these weak electrical signals and outputs them to the terminal, which analyzes and processes the received signals. Once an abnormal sound wave signal is detected, an alarm or other preventive measures can be triggered, thereby achieving effective detection of aluminum liquid leakage.

[0044] In an embodiment of the present application, referring to Figure 1 , the coupling member 21 comprises a first coupling part 211 and a second coupling part 212, at least one of the first coupling part 211 and the second coupling part 212 abutting and sealing the signal introduction hole 102, and the first coupling part 211 and the second coupling part 212 are inserted and matched to form a mounting cavity 201 accommodating the piezoelectric member 22.

[0045] In the embodiment, the first coupling part 211 and / or the second coupling part 212 directly contact the signal introduction hole 102, ensuring that the external sound wave signals can be effectively transmitted to the internal piezoelectric member 22. The second coupling part 212 is used in cooperation with the first coupling part 211, and the two together form a complete mounting cavity 201, which is specially designed to accommodate the piezoelectric member 22, ensuring that it maintains a stable position during operation and is not affected by the external environment. The second coupling part 212 and the first coupling part 211 are connected in a plug-in manner, which can ensure that they are tightly fitted and prevent any gaps or looseness that may affect the transmission of sound wave signals. In addition, the plug-in design makes it more convenient to install and remove the first coupling part 211 and the second coupling part 212, facilitating the maintenance and replacement of the piezoelectric member 22.

[0046] In an embodiment of the present application, referring to Figure 1 , the coupling member 21 is made of metal material;

[0047] Alternatively, the coupling member 21 is made of thermoplastic material.

[0048] In the embodiment, the coupling member 21 is made of metal material such as stainless steel, so that the coupling member 21 has good mechanical strength and corrosion resistance, and can maintain stable physical properties in a large temperature range, thereby enhancing the stability and durability of the underwater acoustic wave sensor 100 under high temperature conditions; or the coupling member 21 is made of thermoplastic material, which has a low density, so that the weight of the entire underwater acoustic wave sensor 100 can be reduced, facilitating carrying and installation, and the thermoplastic material is a good electrical insulator, which can reduce the risk of short circuit of the internal circuit of the sensor and improve the reliability of the sensor.

[0049] In an embodiment of the utility model, refer to Figure 1 , the amplification module 3 includes:

[0050] The amplifier 31 is arranged in the accommodating cavity 101, the amplifier 31 is electrically connected with the piezoelectric component 2, and the amplifier 31 is used to receive the electric signal and output after amplification;

[0051] The conductive part 32 is fixed and electrically connected to the amplifier 31, the conductive part 32 extends to the outside of the shell 1 from the mounting hole 103, and is used to be electrically connected to a terminal, and the conductive part 32 is used to output the amplified electric signal to the terminal.

[0052] In the embodiment, the amplifier 31 is arranged in the accommodating cavity 101 of the shell 1 and is electrically connected with the piezoelectric component 2, is used to receive the weak electric signal converted from the piezoelectric component 2, and amplifies the weak electric signal to make the intensity sufficient to support subsequent data transmission or further analysis. The conductive part 32 is a high-temperature-resistant conductive part 32 fixed and electrically connected to the amplifier 31, to ensure stable electrical connection between the two. The conductive part 32 extends to the outside of the shell 1 from the mounting hole 103, and is used to output the amplified electric signal to a terminal (such as a data recorder, a detection system, etc.), for analysis and processing by the terminal. The conductive part 32 is a high-temperature-resistant metal shielding wire, which can effectively transmit the electric signal converted from the piezoelectric component 2, maintain good electrical conductivity even in high-temperature and high-pressure environments, and the metal shielding layer can block the influence of external electromagnetic fields on the internal signal line, reduce electromagnetic interference, and ensure the purity and integrity of the electric signal transmitted to the terminal. In addition, the shielding wire made of high-temperature-resistant material can maintain its physical and electrical properties unchanged and not aged under high-temperature conditions, ensuring long-term stable operation.

[0053] In an embodiment of the utility model, refer to Figure 1The shell 1 comprises a shell body 11 and a cover body 12, the shell body 11 is connected with the cover body 12 to enclose the accommodating cavity 101, and the cover body 12 is provided with the mounting hole 103.

[0054] In the embodiment, the shell body 11 constitutes the main part of the shell 1 and provides support and protection for internal components such as the piezoelectric component 2, the amplifier 31 and the like. The cover body 12 is connected with the shell body 11 to jointly enclose the sealed accommodating cavity 101, thereby not only playing a sealing role but also realizing the leading-out of the conductive part 32 by being provided with the mounting hole 103. By dividing the shell 1 into the shell body 11 and the cover body 12, the manufacturing and assembly process of the underwater acoustic wave sensor 100 can be simplified, and the later maintenance and overhaul are facilitated. In the extreme environment of high-temperature molten aluminum leakage detection, the shell body 11 and / or the cover body 12 can be made of materials resistant to high temperature and corrosion, so as to have sufficient mechanical strength to resist external pressure and impact.

[0055] In an embodiment of the utility model, refer to Figure 1 The signal introduction hole 102 comprises a first hole section 1021 and a second hole section 1022 which are in communication with each other, the first hole section 1021 is arranged close to the piezoelectric component 2, the piezoelectric component 2 is sealed in abutment with the first hole section 1021, and the aperture of the first hole section 1021 is smaller than the aperture of the second hole section 1022.

[0056] In the embodiment, the first hole section 1021 is arranged close to the piezoelectric component 2, and the piezoelectric component 2 is sealed in abutment with the first hole section 1021, and this close contact ensures that the sound waves transmitted from the outside can be efficiently transmitted to the piezoelectric component 2. The aperture of the first hole section 1021 is small, which helps to concentrate the sound wave energy, reduce energy loss and improve the efficiency of sound wave transmission, and the small aperture can also increase the sealing between the coupling part 21 and the piezoelectric component 2 to prevent other contaminants from entering. The second hole section 1022 is in communication with the first hole section 1021, but is located away from the piezoelectric component 2. This layout mainly considers the problems that may be encountered in the actual installation environment, such as the situation that underwater substances block the first hole section 1021. The larger second hole section 1022 can effectively prevent underwater substances (such as silt, algae and the like) from blocking the hole due to sensor installation, ensuring that sound waves can be smoothly transmitted to the first hole section 1021 through the water medium, and then transmitted to the piezoelectric component 2 through the first hole section 1021. Furthermore, the second hole section 1022 as the first channel for sound waves to enter can play a certain "buffering" role, so that the sound waves can be preliminarily adjusted before entering the first hole section 1021, thereby being more uniformly transmitted to the piezoelectric component 2, and the detection accuracy is improved.

[0057] In an embodiment of the utility model, refer to Figure 1The aperture of the second hole section 1022 is arranged in a narrowing manner towards the first hole section 1021.

[0058] In this embodiment, the aperture of the second hole section 1022 is larger from the side far away from the piezoelectric component 2 and gradually narrows towards the first hole section 1021. This gradual change in aperture helps to guide and concentrate the sound wave energy, reducing the energy loss of the sound wave when entering. The narrowing design acts like a "horn mouth", gradually concentrating the sound waves entering from the outside, so that more sound wave energy can be efficiently transmitted to the piezoelectric component 2, improving the sensor's ability to capture weak signals. The gradual narrowing design can also help some smaller particulate matter to be naturally discharged with the water flow, providing a certain self-cleaning effect for the second hole section 1022, reducing the probability of the first hole section 1021 and the second hole section 1022 being blocked.

[0059] In an embodiment of the present application, referring to Figure 1 The accommodating cavity 101 of the shell 1 is filled with a thermal insulation body 4.

[0060] In this embodiment, the thermal insulation body 4 is a high-temperature resistant epoxy resin, which is used to bond the connection between the shell 1, the amplification module 3 and the piezoelectric component 2. It not only provides mechanical fixation, enhances the sealing and waterproofness of the underwater sound wave sensor 100 in the overall structure, but also can withstand high temperature environment. Because the amplification module 3 and the piezoelectric component 2 are fixed, the quality of the electrical signal transmitted by the conductive part 32 of the amplification module 3 to the terminal can be guaranteed, and the detection accuracy can be improved.

[0061] In an embodiment of the present application, referring to Figure 1 The shell 1 is provided with a fixing part 5, which is used to fix the underwater sound wave sensor 100 to the measured position.

[0062] In this embodiment, the fixing part 5 is a component installed on the shell 1, which aims to provide a safe and reliable way to fix the sensor to the predetermined measurement position. The fixing part 5 can adopt various connection methods, such as threaded connection, buckle connection, clamp fixation, etc., depending on the actual application requirements and environmental conditions. By setting the fixing part 5, the sensor can be ensured to remain fixed during operation, avoiding displacement caused by water flow impact or other external factors, thereby ensuring the accuracy and consistency of the measurement data. In addition, considering the corrosion risk in underwater environment, the fixing part 5 should be made of corrosion-resistant materials, such as stainless steel, titanium alloy or specially treated high polymer materials.

[0063] The above merely describes preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, and by using the content of the present application specification and drawings, are included in the patent protection scope of the present application.

Claims

1. An underwater acoustic wave sensor, characterized by, The application relates to an underwater acoustic wave sensor. The underwater acoustic wave sensor comprises a shell, a piezoelectric component and an amplification module. The shell is provided with a containing cavity, a signal introduction hole and a mounting hole. The piezoelectric component is arranged in the containing cavity and abuts and seals the signal introduction hole.

2. The underwater acoustic wave sensor of claim 1, wherein, The piezoelectric component is used for receiving an acoustic wave signal via the signal introduction hole and converting the acoustic wave signal into an electric signal and then outputting the electric signal. One end of the amplification module is arranged in the containing cavity and electrically connected with the piezoelectric component. The other end of the amplification module is arranged outside the shell via the mounting hole and is used for electrically connecting with a terminal.

3. The underwater acoustic wave sensor of claim 2, wherein, The amplification module is used for receiving the electric signal and amplifying the electric signal and then outputting the amplified electric signal to the terminal.

4. The underwater acoustic wave sensor of claim 2, wherein, The piezoelectric component comprises a coupling member and a piezoelectric member. The coupling member is arranged in the containing cavity and abuts and seals the signal introduction hole.

5. The underwater acoustic wave sensor of claim 1, wherein, The coupling member is used for receiving the acoustic wave signal transmitted by the signal introduction hole and outputting the acoustic wave signal. The piezoelectric member is arranged in the mounting cavity and is electrically connected with the coupling member and the amplification module. The piezoelectric member is used for receiving the acoustic wave signal and converting the acoustic wave signal into the electric signal and then outputting the electric signal to the amplification module.

6. The underwater acoustic wave sensor of claim 5, wherein, The coupling member comprises a first coupling part and a second coupling part.

7. The underwater acoustic wave sensor of claim 1, wherein, At least one of the first coupling part and the second coupling part abuts and seals the signal introduction hole.

8. The underwater acoustic wave sensor of claim 7, wherein, The first coupling part and the second coupling part are inserted and matched to enclose the mounting cavity for accommodating the piezoelectric member.

9. The underwater acoustic wave sensor of any one of claims 1-8, wherein, The coupling member is made of metal material.

10. The underwater acoustic wave sensor of any one of claims 1-8, wherein, Alternatively, the coupling member is made of thermoplastic material. The amplification module comprises an amplifier and a conductive member. The amplifier is arranged in the containing cavity and is electrically connected with the piezoelectric component. The amplifier is used for receiving the electric signal and amplifying the electric signal and then outputting the amplified electric signal. The conductive member is fixed and electrically connected with the amplifier. The conductive member is arranged outside the shell via the mounting hole and is used for electrically connecting with the terminal. The conductive member is used for outputting the amplified electric signal to the terminal. The shell comprises a shell body and a cover. The shell body and the cover are connected to enclose the containing cavity. The cover is provided with the mounting hole. The signal introduction hole comprises a first hole section and a second hole section which are in communication with each other. The first hole section is arranged close to the piezoelectric component. The piezoelectric component abuts and seals the first hole section. The aperture of the first hole section is smaller than the aperture of the second hole section. The aperture of the second hole section is narrowed towards the first hole section. The containing cavity of the shell is filled with a heat insulation body. The shell is provided with a fixing member. The fixing member is used for fixing the underwater acoustic wave sensor to a position to be measured.

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