Real-time monitoring device for underwater temperature of circular tube type underwater acoustic transducer and use method of real-time monitoring device

Abstract

The invention provides a real-time monitoring device for the underwater temperature of a circular tube type underwater acoustic transducer and a using method thereof.The real-time monitoring device comprises a piezoelectric ceramic circular tube, a thermocouple sensor and an external cable, and the thermocouple hot end of a thermocouple outgoing line of the thermocouple sensor is connected to a temperature monitoring point of the piezoelectric ceramic circular tube in a fastened mode; a piezoelectric ceramic positive electrode lead and a piezoelectric ceramic negative electrode lead are respectively led out from temperature monitoring points of the piezoelectric ceramic circular tube, a thermocouple cold end of the thermocouple outgoing line, the piezoelectric ceramic positive electrode lead and the piezoelectric ceramic negative electrode lead are all connected with one end of an external cable, and the other end of the external cable is respectively connected with a transmitting circuit positive electrode and a transmitting circuit negative electrode. According to the invention, the hot end of the thermocouple is connected with the temperature monitoring point of the piezoelectric ceramic circular tube, and the cold end of the thermocouple is separated from the piezoelectric ceramic circular tube, so that the temperature measurement error and response time of the transducer can be reduced, the temperature measurement precision and effectiveness are improved, and the transducer can be applied to an underwater acoustic transducer with a limited internal space.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater acoustic transducers, and in particular to a real-time monitoring device for underwater temperature of a circular tube type underwater acoustic transducer and a method for using the device. Background Art

[0002] In the development of modern underwater acoustics, underwater acoustic equipment shows a trend towards high power, high stability and long-term use. That is, underwater acoustic transducers need to work for a long time and at high power, which leads to increasingly serious heating of underwater acoustic transducers. Therefore, it is more meaningful to establish a suitable real-time monitoring method for underwater temperature of underwater acoustic transducers and to monitor the temperature of key components of underwater acoustic transducers in real time to guide the long-term and high-power use of underwater acoustic equipment.

[0003] The existing Chinese patent with publication number CN216900919U discloses an underwater acoustic transducer capable of online temperature measurement, which mainly includes a transducer housing, a plurality of Bragg fiber grating temperature sensors, a test optical fiber and a watertight socket. The Bragg fiber grating temperature sensor is fixed to the surface to be measured inside the transducer, and the test optical fiber is led out of the tail of the Bragg fiber grating temperature sensor. The test optical fiber passes through the watertight socket and passes through the transducer to connect with the wavelength demodulation device to form a test optical path. However, this patent is not suitable for real-time underwater temperature monitoring of overflow-type and air-backed circular tube-type underwater acoustic transducers.

[0004] At present, there are studies on the use of resistive sensors to monitor underwater temperature of hydroacoustic transducers. However, the internal space of a circular tubular hydroacoustic transducer is often relatively small, and it is impossible to arrange a long resistive sensor inside. In addition, the insertion loss of the resistive sensor is large, which will affect the accuracy of underwater real-time temperature monitoring. In addition, the circular tubular hydroacoustic transducer is very sensitive to the large load generated when the resistive sensor is installed, and the vibration characteristics of the transducer will change, and the acoustic performance will be greatly affected and changed. Therefore, resistive sensors are not suitable for real-time underwater temperature monitoring of circular tubular hydroacoustic transducers.

[0005] Therefore, the inventors believe that it is necessary to provide a real-time monitoring device for the underwater temperature of a circular tube-type hydroacoustic transducer and a method of using the device, which can be applied to hydroacoustic transducers with relatively limited internal space, can achieve temperature monitoring without affecting the electroacoustic performance of the transducer, and can reduce the temperature measurement error and response time of the transducer, thereby improving the temperature measurement accuracy and effectiveness. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a real-time monitoring device for underwater temperature of a circular tube type underwater acoustic transducer and a method for using the same.

[0007] According to the present invention, a real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer comprises: a piezoelectric ceramic circular tube, a thermocouple sensor and an external cable, wherein the thermocouple hot end of the thermocouple lead wire of the thermocouple sensor is fastened to the temperature monitoring point of the piezoelectric ceramic circular tube, the temperature monitoring point of the piezoelectric ceramic circular tube leads out a piezoelectric ceramic positive lead wire and a piezoelectric ceramic negative lead wire respectively, the thermocouple cold end of the thermocouple lead wire, the piezoelectric ceramic positive lead wire and the piezoelectric ceramic negative lead wire are all connected to one end of the external cable, and the other end of the external cable is respectively connected to the positive electrode and the negative electrode of the transmitting circuit.

[0008] Preferably, the circular tube type underwater acoustic transducer includes an air-backed circular tube type underwater acoustic transducer, a sealing cover plate is installed on the piezoelectric ceramic circular tube through a vibration isolation device, a sealing cover plate opening is opened in the middle of the sealing cover plate, the external cable is led outward from the sealing cover plate opening, and a watertight seal is arranged at the sealing cover plate opening.

[0009] Preferably, the piezoelectric ceramic circular tube includes radially polarized circular tube piezoelectric ceramics or tangentially polarized circular tube piezoelectric ceramics, and the thermocouple sensor includes a K-type thermocouple.

[0010] Preferably, the temperature monitoring point is the point where the amplitude of the circular tube type hydroacoustic transducer is the largest or the point where the internal heat dissipation effect is the worst, and the temperature monitoring point includes one or more.

[0011] Preferably, the outer side of the thermocouple sensor is coated with a heat-insulating coating layer, the outer side of the piezoelectric ceramic tube is coated with a watertight coating layer, and the connection of the external cable is coated with a sealing layer.

[0012] According to a method for using a real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer provided by the present invention, the real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer is used, and the method comprises the following steps:

[0013] Step 1, fixing the hot end of the thermocouple to the temperature monitoring point on the piezoelectric ceramic tube;

[0014] Step 2, using watertight material to make a heat-insulating coating layer for the thermocouple lead wire;

[0015] Step 3, respectively lead out the piezoelectric ceramic positive electrode lead and the piezoelectric ceramic negative electrode lead at the temperature monitoring point of the piezoelectric ceramic tube;

[0016] Step 4, respectively connecting the cold end of the thermocouple, the positive lead of the piezoelectric ceramic, and the negative lead of the piezoelectric ceramic to the external cable to obtain a thermocouple connecting wire and a positive-negative connecting wire;

[0017] Step 5: Use watertight material to cover the contact point formed by the cold end of the thermocouple and the external cable;

[0018] Step 6, use the positive-negative connecting wire at the other end of the external cable to connect the positive pole of the transmitting circuit and the negative pole of the transmitting circuit;

[0019] Step 7, using watertight material to make a watertight coating layer of the piezoelectric ceramic round tube;

[0020] Step 8: Use the post-processing module of the thermocouple sensor to connect the thermocouple connecting wire of the external cable.

[0021] Preferably, in step 1, the method for fixing the hot end of the thermocouple and the piezoelectric ceramic tube includes bonding with conductive adhesive or welding with solder;

[0022] In step 4 and step 6, the connection mode of the external cable includes one-to-many connection or one-to-one connection.

[0023] Preferably, in step 2 and step 5, the sealing method of the watertight material includes polyurethane potting or watertight tape winding;

[0024] In the step seven, the sealing method of the watertight material includes polyurethane potting or rubber vulcanization.

[0025] Preferably, the air-backed circular tube type underwater acoustic transducer further comprises the following steps:

[0026] Step 9: Lead out the thermocouple lead wire, the piezoelectric ceramic positive electrode lead wire, the piezoelectric ceramic negative electrode lead wire, and the external cable from the sealing cover plate opening on the sealing cover plate;

[0027] Step 10: Use sealing material to watertightly seal the opening of the sealing cover plate.

[0028] Preferably, in the step nine, the material of the sealing cover plate includes a hard metal material;

[0029] In the step 10, the sealing method includes polyurethane potting or waterproof resin filling.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention connects the hot end of the thermocouple with the temperature monitoring point of the piezoelectric ceramic tube, and separates the cold end of the thermocouple from the piezoelectric ceramic tube. It can realize temperature monitoring without affecting the electroacoustic performance of the transducer, reduce the temperature measurement error and response time of the transducer, and improve the temperature measurement accuracy and effectiveness. Through a simple structure, it can be applied to underwater acoustic transducers with relatively limited internal space, which helps to expand the scope of application.

[0032] 2. The present invention uses a K-type thermocouple with a small measuring end diameter to conduct the test, and selects materials with good thermal conductivity to fix the temperature monitoring point of the circular tube type hydroacoustic transducer and the hot end of the thermocouple, so that it is easier to achieve thermal equilibrium between the monitored point and the hot end of the K-type thermocouple, thereby shortening the thermal response time.

[0033] 3. The present invention selects points where heating is more obvious in the circular tube type hydroacoustic transducer as temperature monitoring points, that is, the points with the largest amplitude of the circular tube type hydroacoustic transducer or the worst internal heat dissipation effect should be selected as temperature monitoring points. The positions of the temperature monitoring points are representative and typical, which can reduce the influence of the selection of temperature monitoring points on the representativeness of the measurement results.

[0034] 4. The present invention avoids the influence of insertion depth on measurement accuracy by selecting high thermal insulation material as the thermal insulation material of the thermocouple; by isolating the cold end of the thermocouple from the temperature measurement point using thermal insulation material or means, and by reducing the thickness of the watertight layer at the cold end of the thermocouple, etc., the temperature of the cold end of the thermocouple is made close to or equal to the water temperature, thereby avoiding the influence of the change of the cold end temperature of the K-type thermocouple on the temperature measurement, thereby improving the stability of the cold end temperature of the thermocouple. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0036] Figure 1 This is a schematic diagram of the structure of a real-time monitoring device for underwater temperature of an overflow-type circular tube-type underwater acoustic transducer in Embodiment 1 of the present invention;

[0037] Figure 2 The present invention mainly embodies the real-time monitoring result of underwater temperature at a temperature monitoring point of the overflow type circular tube type underwater acoustic transducer in Example 2;

[0038] Figure 3 The present invention mainly embodies the real-time monitoring results of underwater temperature at two temperature monitoring points of the overflow type circular tube type hydroacoustic transducer in Example 2;

[0039] Figure 4 It is a structural schematic diagram of a real-time monitoring device for underwater temperature of an air-backed circular tube-type hydroacoustic transducer in a variation example of the present invention;

[0040] Figure 5 It is the real-time monitoring result of underwater temperature at two temperature monitoring points of the air-backed circular tube type hydroacoustic transducer in the main embodiment of the present invention.

[0041] As shown in the figure:

[0042] Piezoelectric ceramic tube 1 Thermocouple lead wire 2 Thermocouple hot end 3

[0043] Thermal insulation coating 4 Piezoelectric ceramic positive electrode lead 5 Piezoelectric ceramic negative electrode lead 6

[0044] Thermocouple cold end 7 External cable 8 Transmitter circuit positive pole 9

[0045] Transmitting circuit negative electrode 10 Watertight coating layer 11 Vibration isolation device 12

[0046] Sealing cover plate 13 Sealing cover plate opening 14 DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, a real-time monitoring device for underwater temperature of a circular tube type underwater acoustic transducer provided according to the present invention includes: a piezoelectric ceramic circular tube 1, a thermocouple sensor and an external cable 8, the thermocouple hot end 3 of the thermocouple lead wire 2 of the thermocouple sensor is fastened to the temperature monitoring point of the piezoelectric ceramic circular tube 1, the temperature monitoring point of the piezoelectric ceramic circular tube 1 leads out a piezoelectric ceramic positive electrode lead 5 and a piezoelectric ceramic negative electrode lead 6 respectively, the thermocouple cold end 7 of the thermocouple lead wire 2, the piezoelectric ceramic positive electrode lead 5 and the piezoelectric ceramic negative electrode lead 6 are all connected to one end of the external cable 8, and the other end of the external cable 8 is respectively connected to the transmitting circuit positive electrode 9 and the transmitting circuit negative electrode 10.

[0050] The circular tubular hydroacoustic transducer of the present application is described by taking an overflow circular tubular hydroacoustic transducer as an example, and the thermocouple sensor is described by taking a K-type thermocouple as an example. A thermocouple is a component that uses the thermoelectric effect of a conductor or semiconductor material to convert temperature changes into electromotive force changes. The K-type thermocouple mainly realizes temperature monitoring by measuring the difference in contact electromotive force generated when two conductors of different materials are connected at different temperatures. Since the test range of the K-type thermocouple can reach -100°C to 1200°C, and the measurement accuracy is high and the response time is short, it can fully meet the needs of real-time temperature monitoring. At the same time, the K-type thermocouple has relatively excellent linearity, stable thermoelectric performance, strong antioxidant ability, and is suitable for long-term use in scenes such as the closed internal part of the hydroacoustic transducer. Therefore, the present application preferably uses a K-type thermocouple to perform real-time temperature monitoring of the circular tubular hydroacoustic transducer.

[0051] Furthermore, the present application preferably uses a K-type thermocouple with a small measuring end diameter for testing, and selects materials with good thermal conductivity to fix the temperature monitoring point of the circular tube type hydroacoustic transducer and the hot end 3 of the thermocouple, so that it is easier to achieve thermal equilibrium between the monitored point and the hot end of the K-type thermocouple, thereby shortening the thermal response time.

[0052] The piezoelectric ceramic tube 1 includes radially polarized piezoelectric ceramic tubes or tangentially polarized piezoelectric ceramic tubes.

[0053] The temperature monitoring point is the point where the circular tube type hydroacoustic transducer has the largest amplitude or the point where the internal heat dissipation effect is the worst. The temperature monitoring point includes one or more points. The present application selects the point where the heating phenomenon is more obvious in the circular tube type hydroacoustic transducer as the temperature monitoring point, that is, the point where the circular tube type hydroacoustic transducer has the largest amplitude or the point where the internal heat dissipation effect is the worst should be selected as the temperature monitoring point. The position of the temperature monitoring point is representative and typical, which can reduce the influence of the selection of the temperature monitoring point on the representativeness of the measurement results.

[0054] The outer side of the thermocouple sensor is coated with a heat-insulating coating layer 4, the outer side of the piezoelectric ceramic tube 1 is coated with a watertight coating layer 11, and the connection of the external cable 8 is coated with a sealing layer.

[0055] The present application allows the thermocouple to maintain long-term contact with the transducer to ensure that the two are at the same temperature, and at the same time selects a highly insulating material as the insulation layer material of the thermocouple to avoid the influence of the insertion depth on the measurement accuracy. The present application avoids using melt materials as fixed materials for the temperature monitoring points during the experiment, thereby avoiding the occurrence of deposition or aggregation, and avoiding the influence of increased thermal impedance on the measurement accuracy.

[0056] In order to avoid the influence of the temperature change of the cold end of the K-type thermocouple on the temperature measurement, the cold end 7 of the thermocouple is isolated from the temperature measurement point by using insulating materials or means, and the temperature of the cold end 7 of the thermocouple is made close to or equal to the water temperature by reducing the thickness of the watertight layer at the cold end 7 of the thermocouple, thereby improving the stability of the temperature of the cold end 7 of the thermocouple.

[0057] This application realizes a real-time monitoring device for underwater temperature of a circular tubular hydroacoustic transducer by using a K-type thermocouple, which can be further applied to other hydroacoustic transducers with relatively limited internal space. This application effectively reduces the transducer temperature measurement error and response time, and improves the temperature measurement accuracy and effectiveness. This application has little effect on the electroacoustic performance of the transducer, and can realize temperature monitoring without affecting the electroacoustic performance of the transducer.

[0058] Example 2

[0059] Based on Example 1, a method for using a real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer provided by the present invention comprises the following steps:

[0060] Step 1, fix the hot end 3 of the thermocouple to the temperature monitoring point on the piezoelectric ceramic tube 1;

[0061] Step 2, using watertight material to make the heat-insulating coating layer 4 of the thermocouple lead wire 2;

[0062] Step 3, respectively lead out the piezoelectric ceramic positive electrode lead 5 and the piezoelectric ceramic negative electrode lead 6 at the temperature monitoring point of the piezoelectric ceramic tube 1;

[0063] Step 4, respectively connect the thermocouple cold end 7, the piezoelectric ceramic positive electrode lead 5, the piezoelectric ceramic negative electrode lead 6 and the external cable 8 to obtain a thermocouple connecting wire and a positive-negative electrode connecting wire;

[0064] Step 5: Use a watertight material to cover the contact point formed by the thermocouple cold end 7 and the external cable 8;

[0065] Step 6, use the positive-negative connecting wire at the other end of the external cable 8 to externally connect the positive electrode 9 of the transmitting circuit and the negative electrode 10 of the transmitting circuit;

[0066] Step 7, using a watertight material to make a watertight coating layer 11 of the piezoelectric ceramic tube 1;

[0067] Step eight, use the post-processing module of the thermocouple sensor to connect the thermocouple connecting wire of the external cable 8.

[0068] In step 1, the fixing method of the thermocouple hot end 3 and the piezoelectric ceramic tube 1 includes bonding with conductive adhesive or welding with solder;

[0069] In step 4 and step 6, the connection mode of the external cable 8 includes one-to-many connection or one-to-one connection.

[0070] In step 2 and step 5, the sealing method of the watertight material includes polyurethane potting or watertight tape winding;

[0071] In step seven, the sealing method of the watertight material includes polyurethane potting or rubber vulcanization.

[0072] In one specific implementation, in step 1, the piezoelectric ceramic tube 1 is a radially polarized piezoelectric ceramic tube; the fixing method between the thermocouple hot end 3 and the piezoelectric ceramic tube 1 is soldering; in steps 2 and 5, the watertight material is polyurethane potting; in step 3, the temperature monitoring point is the point with the largest amplitude of the circular tube type underwater acoustic transducer, and multiple temperature monitoring points are selected; in steps 4 and 6, the connection method of the external cable 8 is one-to-one connection; in step 7, the watertight material is polyurethane potting. Experiments can be conducted to obtain the following results: Figure 2 The real-time monitoring results of underwater temperature at a temperature monitoring point of the overflow circular tube type hydroacoustic transducer shown in FIG. Figure 3The real-time monitoring results of underwater temperature at two temperature monitoring points of the overflow circular tube hydroacoustic transducer are shown.

[0073] This application realizes a real-time monitoring device for underwater temperature of a circular tubular hydroacoustic transducer by using a K-type thermocouple, which can be further applied to other hydroacoustic transducers with relatively limited internal space. This application effectively reduces the transducer temperature measurement error and response time, and improves the temperature measurement accuracy and effectiveness. This application has little effect on the electroacoustic performance of the transducer, and can realize temperature monitoring without affecting the electroacoustic performance of the transducer.

[0074] Variations

[0075] like Figure 4 As shown, based on Example 1 and Example 2, when the circular tube type hydroacoustic transducer is an air-backed circular tube type hydroacoustic transducer, a sealing cover plate 13 is installed on the piezoelectric ceramic circular tube 1 through a vibration isolation device 12, a sealing cover plate opening 14 is opened in the middle of the sealing cover plate 13, an external cable 8 is led outward from the sealing cover plate opening 14, and a watertight seal is provided at the sealing cover plate opening 14.

[0076] The method for using the air-backed circular tube type underwater acoustic transducer real-time monitoring device for underwater temperature also includes the following steps:

[0077] Step nine: Lead out the thermocouple lead wire 2 , the piezoelectric ceramic positive electrode lead wire 5 , the piezoelectric ceramic negative electrode lead wire 6 , and the external cable 8 from the sealing cover plate opening 14 on the sealing cover plate 13 .

[0078] Step 10: Use sealing material to watertightly seal the sealing cover plate opening 14.

[0079] In step nine, the material of the sealing cover plate 13 includes a pressure-resistant hard metal material, such as stainless steel.

[0080] In step ten, the sealing method includes polyurethane potting or waterproof resin filling.

[0081] In one specific implementation, in step one, the piezoelectric ceramic tube 1 is a radially polarized circular tube piezoelectric ceramic; the fixing method between the thermocouple hot end 3 and the piezoelectric ceramic tube 1 is soldering; in steps two and five, the watertight material is polyurethane potting; in step three, the temperature monitoring point is the point with the largest amplitude of the circular tube type underwater acoustic transducer, and multiple temperature monitoring points are selected; in steps four and six, the connection method of the external cable 8 is one-to-one connection; in step seven, the watertight material is polyurethane potting; in step nine, the sealing cover material is stainless steel; in step ten, the sealing material is waterproof resin filling. By conducting experiments, it can be obtained as follows Figure 5 The real-time monitoring results of underwater temperature at two temperature monitoring points of the air-backed circular tube type hydroacoustic transducer are shown.

[0082] This application realizes a real-time monitoring device for underwater temperature of a circular tubular hydroacoustic transducer by using a K-type thermocouple, which can be further applied to other hydroacoustic transducers with relatively limited internal space. This application effectively reduces the transducer temperature measurement error and response time, and improves the temperature measurement accuracy and effectiveness. This application has little effect on the electroacoustic performance of the transducer, and can realize temperature monitoring without affecting the electroacoustic performance of the transducer.

[0083] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0084] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer, characterized in that: include: A piezoelectric ceramic round tube (1), a thermocouple sensor and an external cable (8), wherein the thermocouple hot end (3) of the thermocouple lead wire (2) of the thermocouple sensor is firmly connected to the temperature monitoring point of the piezoelectric ceramic round tube (1), the temperature monitoring point of the piezoelectric ceramic round tube (1) respectively leads out a piezoelectric ceramic positive electrode lead wire (5) and a piezoelectric ceramic negative electrode lead wire (6), the thermocouple cold end (7) of the thermocouple lead wire (2), the piezoelectric ceramic positive electrode lead wire (5) and the piezoelectric ceramic negative electrode lead wire (6) are all connected to one end of the external cable (8), and the other end of the external cable (8) is respectively connected to a transmitting circuit positive electrode (9) and a transmitting circuit negative electrode (10).

2. The real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer according to claim 1, characterized in that: The circular tube type underwater acoustic transducer comprises an air-backed circular tube type underwater acoustic transducer, wherein a sealing cover plate (13) is installed on the piezoelectric ceramic circular tube (1) through a vibration isolation device (12), a sealing cover plate opening (14) is provided in the middle of the sealing cover plate (13), the external cable (8) is led outward from the sealing cover plate opening (14), and a watertight seal is provided at the sealing cover plate opening (14).

3. The real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer according to claim 1, characterized in that: The piezoelectric ceramic circular tube (1) comprises radially polarized circular tube piezoelectric ceramics or tangentially polarized circular tube piezoelectric ceramics, and the thermocouple sensor comprises a K-type thermocouple.

4. The real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer according to claim 1, characterized in that: The temperature monitoring point is the point where the circular tube type hydroacoustic transducer has the largest amplitude or the point where the internal heat dissipation effect is the worst, and the temperature monitoring point includes one or more points.

5. The real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer according to claim 1, characterized in that: The outer side of the thermocouple sensor is coated with a heat-insulating coating layer (4), the outer side of the piezoelectric ceramic tube (1) is coated with a watertight coating layer (11), and the connection of the external cable (8) is coated with a sealing layer.

6. A method for using a real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer, characterized in that: A real-time monitoring device for underwater temperature using a circular tubular underwater acoustic transducer as described in any one of claims 1 to 5 comprises the following steps: Step 1, fixing the hot end of the thermocouple (3) to the temperature monitoring point on the piezoelectric ceramic tube (1); Step 2: using watertight material to make a heat-insulating coating layer (4) of the thermocouple lead wire (2); Step 3, respectively lead out a piezoelectric ceramic positive electrode lead (5) and a piezoelectric ceramic negative electrode lead (6) at a temperature monitoring point of the piezoelectric ceramic round tube (1); Step 4, respectively connecting the thermocouple cold end (7), the piezoelectric ceramic positive electrode lead (5), the piezoelectric ceramic negative electrode lead (6) and the external cable (8) to obtain a thermocouple connecting wire and a positive-negative electrode connecting wire; Step 5, using a watertight material to cover the contact point formed by the thermocouple cold end (7) and the external cable (8); Step 6, using the positive-negative connecting wire at the other end of the external cable (8) to externally connect the positive electrode (9) of the transmitting circuit and the negative electrode (10) of the transmitting circuit; Step 7, using a watertight material to make a watertight coating layer (11) of the piezoelectric ceramic tube (1); Step eight, use the post-processing module of the thermocouple sensor to connect the thermocouple connecting wire of the external cable (8).

7. The method for using the real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer as claimed in claim 6, characterized in that: In the step 1, the method for fixing the hot end of the thermocouple (3) and the piezoelectric ceramic tube (1) includes bonding with conductive adhesive or welding with solder; In step 4 and step 6, the connection mode of the external cable (8) includes one-to-many connection or one-to-one connection.

8. The method for using the real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer as claimed in claim 6, characterized in that: In the step 2 and step 5, the sealing method of the watertight material includes polyurethane potting or watertight tape winding; In the step seven, the sealing method of the watertight material includes polyurethane potting or rubber vulcanization.

9. The method for using the real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer according to claim 6, characterized in that: The air-backed circular tube type underwater acoustic transducer also includes the following steps: Step nine, lead out the thermocouple lead wire (2), the piezoelectric ceramic positive electrode lead wire (5), the piezoelectric ceramic negative electrode lead wire (6), and the external cable (8) from the sealing cover plate opening (14) on the sealing cover plate (13); Step 10: Use sealing material to watertightly seal the sealing cover plate opening (14).

10. The method for using the real-time monitoring device for underwater temperature of a circular tube-type underwater acoustic transducer according to claim 9, characterized in that: In the step nine, the material of the sealing cover plate (13) includes a hard metal material; In the step 10, the sealing method includes polyurethane potting or waterproof resin filling.

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