Anti-electromagnetic interference underwater acoustical holographic sensor

Abstract

The utility model relates to an anti-electromagnetic interference underwater acoustical holographic sensor, which comprises a plastic sealing shell, piezoelectric ceramics and a cable. The plastic sealing shell comprises an inner watertight sound transmission layer and an outer watertight sound transmission layer, and a shielding metal net is arranged between the inner watertight sound transmission layer and the outer watertight sound transmission layer. An inner cavity used for installing piezoelectric ceramics is formed in the inner watertight sound transmission layer and located in the shielding metal net, and the piezoelectric ceramics are attached to the cavity wall of the inner cavity. A rubber column protrudes out of the outer watertight sound transmission layer, the rubber column is used for being connected with the underwater vehicle, a positioning hole is formed in the rubber column, one end of the cable is installed in the positioning hole, and the cable is electrically connected with the piezoelectric ceramic. According to the utility model, the shielding metal net is arranged between the inner watertight sound transmission layer and the outer watertight sound transmission layer, and the inner cavity for installing the piezoelectric ceramic in the inner watertight sound transmission layer is positioned in the shielding metal net, so that the piezoelectric ceramic is ensured not to be interfered by external electromagnetic interference during working; the anti-interference performance of the electromagnetic interference underwater acoustical holography sensor is improved.

Description

Technical Field

[0001] The utility model relates to the field of underwater acoustic sensing, in particular to an underwater acoustic holographic sensor capable of resisting electromagnetic interference. Background Art

[0002] Underwater acoustic holographic sensors are receiving transducers used to obtain underwater acoustic pressure information, which can convert acoustic signals into voltage signals for output. With the further development of research on ocean acoustic field information, the demand for deep-water hydrophones carried by various types of unmanned submersibles is also increasing. At present, most hydrophones only use cables with shielding layers, and do not add shielding layers to the hydrophone body, so they are very susceptible to space electromagnetic interference. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] The utility model provides an anti-electromagnetic interference underwater acoustic holographic sensor, aiming to solve the technical problem that the anti-electromagnetic interference underwater acoustic holographic sensor in the prior art is easily subject to electromagnetic interference.

[0005] (II) Technical solution

[0006] In order to solve the above problems, the utility model provides an anti-electromagnetic interference underwater acoustic holographic sensor, the anti-electromagnetic interference underwater acoustic holographic sensor comprises: a plastic sealed housing, piezoelectric ceramics and a cable;

[0007] The plastic sealed shell comprises: an inner watertight sound-permeable layer and an outer watertight sound-permeable layer, and a shielding metal mesh is arranged between the inner watertight sound-permeable layer and the outer watertight sound-permeable layer;

[0008] An inner cavity for mounting the piezoelectric ceramic is provided in the inner watertight sound-permeable layer, the inner cavity is located in the shielding metal mesh, and the piezoelectric ceramic is attached to the cavity wall of the inner cavity;

[0009] The outer watertight sound-permeable layer is protruded with a rubber column, the rubber column is used to connect with the submersible, a positioning hole is arranged on the rubber column, one end of the cable is installed in the positioning hole, and the cable is electrically connected to the piezoelectric ceramic.

[0010] Preferably, a metal front cover plate and a metal rear cover plate are respectively provided at both ends of the inner cavity;

[0011] The metal front cover plate and the metal rear cover plate are both provided with positioning rings, and the piezoelectric ceramic is arranged on the positioning rings; a conductive column is protrudingly provided on the metal front cover plate, and the shielding metal mesh is in contact with the conductive column; the inner watertight sound-permeable layer and the outer watertight sound-permeable layer are both provided with conductive holes for accommodating the conductive column, and the conductive column can contact the outside world through the conductive holes.

[0012] Preferably, the piezoelectric ceramic includes a first piezoelectric ceramic and a second piezoelectric ceramic, and an intermediate positioning ring is further provided between the metal front cover plate and the metal rear cover plate;

[0013] The first piezoelectric ceramic is arranged on the positioning ring and the middle positioning ring on the metal front cover plate, and the second piezoelectric ceramic is arranged between the positioning ring and the middle positioning ring on the metal rear cover plate.

[0014] Preferably, the rubber column is provided with an external thread.

[0015] Preferably, the underwater holographic sensor further includes a sound booster, the sound booster is electrically connected to the piezoelectric ceramic, and the cable is electrically connected to the sound booster.

[0016] Preferably, the inner cavity is a cylindrical inner cavity, and the piezoelectric ceramic is in a ring shape.

[0017] Preferably, a wiring hole is provided through the metal back cover plate, a connecting post is provided in the wiring hole, a wiring post is provided through the connecting post, one end of the wiring post is electrically connected to the amplifier, and the other end of the wiring post is electrically connected to the cable.

[0018] (III) Beneficial effects

[0019] The utility model arranges a shielding metal mesh between the inner watertight sound-permeable layer and the outer watertight sound-permeable layer, and makes the inner cavity for installing the piezoelectric ceramic in the inner watertight sound-permeable layer be located inside the shielding metal mesh, thereby ensuring that the operation of the piezoelectric ceramic will not be affected by external electromagnetic interference, thereby improving the anti-interference ability of the electromagnetic interference underwater acoustic holographic sensor in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the utility model underwater acoustic holographic sensor with anti-electromagnetic interference.

[0021] [Description of Reference Numerals]

[0022] 1: Plastic sealed shell; 11: Inner watertight sound-permeable layer; 12: Outer watertight sound-permeable layer; 13: Shielding metal mesh; 14: Inner cavity; 15: Rubber column; 16: Positioning hole; 17: Conductive hole; 2: Piezoelectric ceramic; 21: First piezoelectric ceramic; 22: Second piezoelectric ceramic; 3: Cable; 4: Metal front cover; 41: Conductive column; 5: Metal rear cover; 51: Wiring hole; 52: Connecting column; 53: Wiring column; 6: Positioning ring; 7: Middle positioning ring; 8: Amplifier. DETAILED DESCRIPTION

[0023] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The utility model provides an electromagnetic interference underwater acoustic holographic sensor and an anti-electromagnetic interference underwater acoustic holographic sensor, comprising: a plastic sealed shell 1, a piezoelectric ceramic 2 and a cable 3. The plastic sealed shell 1 comprises: an inner watertight sound-permeable layer 11 and an outer watertight sound-permeable layer 12, and a shielding metal mesh 13 is arranged between the inner watertight sound-permeable layer 11 and the outer watertight sound-permeable layer 12. An inner cavity 14 for installing the piezoelectric ceramic 2 is arranged in the inner watertight sound-permeable layer 11, and the inner cavity 14 is located in the shielding metal mesh 13, and the piezoelectric ceramic 2 is attached to the cavity wall of the inner cavity 14. A rubber column 15 protrudes from the outer watertight sound-permeable layer 12, and the rubber column 15 is used to connect with the submersible. A positioning hole 16 is arranged on the rubber column 15, and one end of the cable 3 is installed in the positioning hole 16, and the cable 3 is electrically connected to the piezoelectric ceramic 2. The shielding metal mesh 13 is preferably a shielding copper mesh.

[0028] In the technical solution provided in the present application, a shielding metal mesh 13 is arranged between the inner watertight sound-permeable layer 11 and the outer watertight sound-permeable layer 12, and the inner cavity 14 in the inner watertight sound-permeable layer 11 for installing the piezoelectric ceramic 2 is located in the shielding metal mesh 13, thereby ensuring that the operation of the piezoelectric ceramic 2 will not be affected by external electromagnetic interference, thereby improving the anti-interference ability of the electromagnetic interference underwater acoustic holographic sensor in the present application. In the above scheme, the inner watertight sound-permeable layer 11 and the outer watertight sound-permeable layer 12 constituting the plastic sealed shell 1 are made of the same material. When manufacturing the electromagnetic interference underwater acoustic holographic sensor, the inner watertight sound-permeable layer 11 can be cast first, and then the shielding metal mesh 13 is attached to the inner watertight sound-permeable layer 11, and finally the outer watertight sound-permeable layer 12 is cast on the inner watertight sound-permeable layer 11. The inner watertight sound-permeable layer 11 and the outer watertight sound-permeable layer 12 are made of the same material. Since they are made of the same material, they can be bonded to each other through the mesh holes of the shielding metal mesh 13 during the casting process, so that the bonding strength between the inner watertight sound-permeable layer 11 and the outer watertight sound-permeable layer 12 is very high.

[0029] In addition, the outer watertight sound-permeable layer 12 and the rubber column 15 are both made of polyurethane, and the entire anti-electromagnetic interference underwater acoustic holographic sensor is made of integral casting. The material of the protective cover on the cable 3 is the same as that of the outer watertight sound-permeable layer 12. Therefore, the present application directly protrudes the rubber column 15 on the outer watertight sound-permeable layer 12, and uses the rubber column 15 to directly seal and connect with the cable 3, and then uses the rubber column 15 to connect with the unmanned underwater vehicle, eliminating the metal base. The rubber column 15 plays a sealing role (the rubber column 15 is cast on the cable 3, and the rubber column 15 and the protective cover on the cable 3 are made of the same material, so the rubber The column 15 can be sealed and connected with the cable 3), and also plays a connecting role (the connection between the rubber column 15 and the unmanned underwater vehicle can be any one of a sealed connection, a snap connection, a glue connection or an interference connection). The rubber column 15 as a whole can be used as a sealant. Under the premise of a small size, the thickness of the sealant is increased, so that when the anti-electromagnetic interference underwater acoustic holographic sensor provided by the present application is used under conditions of repeated pressure changes, the connection of the cable 3 will not have the problem of colloid cracking, thereby ensuring that the interior of the anti-electromagnetic interference underwater acoustic holographic sensor will not be flooded, thereby improving the service life.

[0030] Furthermore, a metal front cover plate 4 and a metal rear cover plate 5 are respectively provided at both ends of the inner cavity 14. A positioning ring 6 is provided on both the metal front cover plate 4 and the metal rear cover plate 5, and the piezoelectric ceramic 2 is provided on the positioning ring 6; a conductive column 41 is protrudingly provided on the metal front cover plate 4, and the shielding metal mesh 13 is in contact with the conductive column 41, and the inner watertight sound-permeable layer 11 and the outer watertight sound-permeable layer 12 are both provided with conductive holes 17 for accommodating the conductive column 41, and the conductive column 41 can contact the outside through the conductive holes 17. When working, the shielding metal mesh 13 can be connected to water through the conductive column 41, so that the shielding metal mesh 13 can play a role in shielding electromagnetic interference. In a more preferred embodiment, the shielding metal mesh 13 and the metal rear cover plate 5 are also connected to the shielding metal mesh 13; in addition, a shielding layer is also provided in the protective cover of the cable 3, and the shielding layer on the cable 3 is connected to the metal rear cover plate 5 through a wire. This ensures that the metal front cover plate 4, the shielding metal mesh 13, the metal rear cover plate 5 and the shielding layer on the cable 3 are all conductive.

[0031] Furthermore, the piezoelectric ceramic 2 includes a first piezoelectric ceramic 21 and a second piezoelectric ceramic 22, and an intermediate positioning ring 7 is provided between the metal front cover plate 4 and the metal rear cover plate 5. The first piezoelectric ceramic 21 is provided on the positioning ring 6 and the intermediate positioning ring 7 on the metal front cover plate 4, and the second piezoelectric ceramic 22 is provided between the positioning ring 6 and the intermediate positioning ring 7 on the metal rear cover plate 5. The outer sides of the first piezoelectric ceramic 21 and the second piezoelectric ceramic 22 are connected by a brush wire, and the positive and negative wires are respectively led out from the inner sides of the first piezoelectric ceramic 21 and the second piezoelectric ceramic 22 and connected to the positive and negative input electrodes of the amplifier 8. The first piezoelectric ceramic 21 and the second piezoelectric ceramic 22 are electrically connected in series, which can effectively reduce the acceleration sensitivity.

[0032] In a preferred embodiment, the rubber column 15 is provided with an external thread. The unmanned submersible is provided with an internal thread that matches the rubber column 15, and the anti-electromagnetic interference underwater acoustic holographic sensor is installed on the unmanned submersible by threaded connection, which can achieve fast and stable disassembly. The underwater holographic sensor also includes a booster 8, which is electrically connected to the piezoelectric ceramic 2, and the cable 3 is electrically connected to the booster 8. The booster 8 plays a role in amplifying the signal.

[0033] Finally, the inner cavity 14 is a cylindrical inner cavity 14, and the piezoelectric ceramic 2 is in a ring shape. A step is provided on the positioning ring 6, and the piezoelectric ceramic 2 is provided on the step. A wiring hole 51 is provided through the metal back cover 5, and a connecting post 52 is provided in the wiring hole 51. A terminal 53 is provided through the connecting post 52, and one end of the terminal 53 is electrically connected to the amplifier 8, and the other end of the terminal 53 is electrically connected to the cable 3.

[0034] It should be understood that the above description of the specific embodiments of the utility model is only for illustrating the technical route and features of the utility model, and its purpose is to enable those skilled in the art to understand the content of the utility model and implement it accordingly, but the utility model is not limited to the above specific implementation methods. All changes or modifications made within the scope of the claims of the utility model should be included in the protection scope of the utility model.

Claims

1. An underwater acoustic holographic sensor resistant to electromagnetic interference, characterized in that: The anti-electromagnetic interference underwater acoustic holographic sensor comprises: a plastic sealed housing (1), piezoelectric ceramics (2) and a cable (3); The plastic sealed shell (1) comprises: an inner watertight sound-permeable layer (11) and an outer watertight sound-permeable layer (12), wherein a shielding metal mesh (13) is arranged between the inner watertight sound-permeable layer (11) and the outer watertight sound-permeable layer (12); An inner cavity (14) for mounting the piezoelectric ceramic (2) is provided in the inner watertight sound-transmitting layer (11); the inner cavity (14) is located in the shielding metal mesh (13); and the piezoelectric ceramic (2) is attached to the cavity wall of the inner cavity (14); The outer watertight sound-permeable layer (12) is provided with a rubber column (15) protruding therefrom. The rubber column (15) is used to be connected to the submersible. A positioning hole (16) is provided on the rubber column (15). One end of the cable (3) is installed in the positioning hole (16). The cable (3) is electrically connected to the piezoelectric ceramic (2).

2. The anti-electromagnetic interference underwater acoustic holographic sensor according to claim 1, characterized in that: A metal front cover plate (4) and a metal rear cover plate (5) are respectively provided at two ends of the inner cavity (14); The metal front cover plate (4) and the metal rear cover plate (5) are both provided with positioning rings (6), and the piezoelectric ceramic (2) is arranged on the positioning rings (6); a conductive column (41) is protrudingly provided on the metal front cover plate (4), the shielding metal mesh (13) is in contact with the conductive column (41), and the inner watertight sound-permeable layer (11) and the outer watertight sound-permeable layer (12) are both provided with conductive holes (17) for accommodating the conductive column (41), and the conductive column (41) can contact the outside world through the conductive holes (17).

3. The anti-electromagnetic interference underwater acoustic holographic sensor according to claim 2, characterized in that: The piezoelectric ceramic (2) comprises a first piezoelectric ceramic (21) and a second piezoelectric ceramic (22), and an intermediate positioning ring (7) is further provided between the metal front cover plate (4) and the metal rear cover plate (5); The first piezoelectric ceramic (21) is arranged on the positioning ring (6) and the intermediate positioning ring (7) on the metal front cover plate (4), and the second piezoelectric ceramic (22) is arranged between the positioning ring (6) and the intermediate positioning ring (7) on the metal rear cover plate (5).

4. The electromagnetic interference resistant underwater acoustic holographic sensor according to any one of claims 1 to 3, characterized in that: The rubber column (15) is provided with an external thread.

5. The electromagnetic interference resistant underwater acoustic holographic sensor according to claim 2 or 3, characterized in that: The anti-electromagnetic interference underwater acoustic holographic sensor also includes a sound amplifier (8), the sound amplifier (8) is electrically connected to the piezoelectric ceramic (2), and the cable (3) is electrically connected to the sound amplifier (8).

6. The electromagnetic interference resistant underwater acoustic holographic sensor according to any one of claims 1 to 3, characterized in that: The inner cavity (14) is a cylindrical inner cavity (14), and the piezoelectric ceramic (2) is in a circular ring shape.

7. The electromagnetic interference resistant underwater acoustic holographic sensor according to claim 5, characterized in that: The metal rear cover plate (5) is provided with a wiring hole (51), a connecting post (52) is provided in the wiring hole (51), a connecting post (53) is provided on the connecting post (52), one end of the connecting post (53) is electrically connected to the amplifier (8), and the other end of the connecting post (53) is electrically connected to the cable (3).

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