Combined type broadband transducer
阅读说明：本技术 一种复合式宽带换能器 (Combined type broadband transducer ) 是由 刘慧生 莫喜平 崔斌 于 2018-08-06 设计创作，主要内容包括：本发明涉及一种复合式宽带换能器,其包括：弯曲板(1)、若干第一压电陶瓷片(2)和若干第一钹(3)；若干第一压电陶瓷片(2)固定连接弯曲板(1)的一侧,且第一钹(3)对应地固定连接第一压电陶瓷片(2)之上；第一钹(3)的中部与第一压电陶瓷片(2)不直接接触,且留有空间；利用复合结构的多模态实现较宽的带宽,克服了传统二叠片、三叠片式换能器和钹式换能器带宽窄的缺点；同时兼具二叠片、三叠片弯曲和钹弯张振动的低频、小尺寸、重量轻的特性。(The invention relates to a composite broadband transducer, comprising: the piezoelectric ceramic plate comprises a curved plate (1), a plurality of first piezoelectric ceramic plates (2) and a plurality of first cymbals (3); the first piezoelectric ceramic plates (2) are fixedly connected with one side of the bending plate (1), and the first cymbals (3) are correspondingly and fixedly connected onto the first piezoelectric ceramic plates (2); the middle part of the first cymbal (3) is not directly contacted with the first piezoelectric ceramic piece (2), and a space is reserved; the wide bandwidth is realized by utilizing the multi-mode of the composite structure, and the defect of narrow bandwidth of the traditional two-lamination, three-lamination type transducer and cymbal type transducer is overcome; meanwhile, the dual-lamination dual-bending cymbal has the characteristics of low frequency, small size and light weight of dual-lamination, three-lamination bending and cymbal bending vibration.)
1. A composite broadband transducer, comprising: the piezoelectric ceramic plate comprises a curved plate (1), a plurality of first piezoelectric ceramic plates (2) and a plurality of first cymbals (3); the first piezoelectric ceramic plates (2) are fixedly connected with one side of the bending plate (1), and the first cymbals (3) are correspondingly and fixedly connected onto the first piezoelectric ceramic plates (2); the middle part of the first cymbal (3) is not in direct contact with the first piezoelectric ceramic piece (2), and a space is reserved.
2. The transducer according to claim 1, wherein a first connection face formed by fixedly connecting one side of the first piezoceramic sheet (2) to the bending plate (1) is coated with epoxy, pre-stressed by positioning, bonded and baked in an oven at 80 ℃ for more than 4 hours; the first cymbal (3) is correspondingly fixed on a second connecting surface formed on the first piezoelectric ceramic piece (2), the second connecting surface is bonded by positioning and applying prestress, and the second connecting surface is baked in an oven at 80 ℃ for more than 4 hours.
3. The transducer according to claim 1, characterized in that the first piezoceramic wafers (2) and the first cymbals (3) are in one-to-one correspondence, with the number of the two opposing.
4. The transducer according to claim 1, characterized in that the first piezoceramic wafer (2) is made of a non-metallic functional material; the bending plate (1) and the first cymbal (3) are made of metal or nonmetal materials, and the shapes of the bending plate and the first cymbal are round or rectangular.
5. The transducer according to claim 1, characterized in that the curved plate (1) and the first cymbal (3) are radially slotted with radial slots.
6. The transducer of claim 1, wherein the composite wideband transducer further comprises: a plurality of second piezoelectric ceramic plates (4) and a plurality of second cymbals (5); the second piezoelectric ceramic pieces (4) are fixedly connected with the other side of the bending plate (1) and are symmetrical with the first piezoelectric ceramic pieces (2); the second cymbal (5) is fixedly connected below the second piezoelectric ceramic piece (4) and is symmetrical to the first cymbal (3); the middle part of the second cymbal (5) is not in direct contact with the second piezoelectric ceramic piece (4), and a space is reserved.
7. The transducer according to claim 6, characterized in that the second piezoceramic wafers (4) and the second cymbals (5) are in one-to-one correspondence, with the number of the two being opposite.
8. The transducer according to claim 6, characterized in that the second piezoceramic wafer (4) is made of a non-metallic material; the second cymbal (5) is made of metal or nonmetal materials, and the shapes of the second cymbal and the second cymbal are circular or rectangular; the second piezoelectric ceramic piece (4) and the first piezoelectric ceramic piece (2) are the same in shape, and the second cymbal (5) and the first cymbal (3) are the same in shape.
9. The transducer according to claim 6, characterized in that the second cymbal (5) is radially slotted with several radial slots.
10. The transducer of claim 6,
when the first cymbal (3), the second cymbal (5) and the bending plate (1) are made of metal materials, the first piezoelectric ceramic (1) and the second piezoelectric ceramic (4) adopt a connection mode that the positive pole and the negative pole are respectively connected in parallel, and the positive pole and the negative pole which are used as input or output are respectively welded on the cymbal (3) and the bending plate (1);
when the first cymbal (3), the second cymbal (5) and the bending plate (1) are made of nonmetal materials, the first piezoelectric ceramic (1) and the second piezoelectric ceramic (4) adopt a connection mode that the positive pole and the negative pole are respectively connected in parallel, and the positive pole and the negative pole which are used as input or output are directly led out from the positive pole and the negative pole of the piezoelectric ceramic.
Technical Field
The invention belongs to the technical field of underwater sound, and particularly relates to a composite broadband transducer.
Background
Acoustic waves are a carrier of energy that propagates remotely in liquids, solids. By utilizing the propagation characteristics of the acoustic signals in the medium, the human can obtain the related characteristic information of liquid and solid, which provides an effective means for the human to know the ocean, develop the ocean, and explore petroleum.
The transducer is used as a device for generating sound wave signals and plays an important role in the field of underwater sound. With the intensive research of human beings on the field of complex environments such as the ocean, the requirements on the energy converter are also improved. Such as increased bandwidth of the transducer for increased volume of information transfer, immunity to multipath effects, fast response, etc.
Currently, conventional low frequency, small size, lightweight transducers include, for example: the two-lamination type transducer, the three-lamination type transducer and the cymbal type transducer are arranged in the middle of the frame;
wherein, as shown in fig. 8, the three-lamination transducer includes: the piezoelectric ceramic plate comprises a
the two-piece laminated transducer includes: the piezoelectric ceramic plate comprises a
as shown in fig. 9, the cymbal transducer includes: a first piezoelectric ceramic 2, a
However, these conventional low-frequency, small-size and light-weight transducers have the defect of narrow working bandwidth, which causes the problems of slow wave-form oscillation, slow wavelength pulling, slow information transmission, slow response, less acquired information, fast source level attenuation from a resonance point and the like in the use process of underwater acoustic communication, well logging and the like. Increasing the operating bandwidth of such transducers has become an urgent problem to be solved.
Disclosure of Invention
In order to solve the above-mentioned drawbacks of the conventional transducer, the present invention provides a composite wideband transducer, which includes: the piezoelectric ceramic cymbal comprises a bending plate, a plurality of first piezoelectric ceramic plates and a plurality of first cymbals; the first piezoelectric ceramic plates are fixedly connected with one side of the bending plate, and the first cymbals are correspondingly and fixedly connected onto the first piezoelectric ceramic plates; the middle part of the first cymbal is not in direct contact with the first piezoelectric ceramic piece, and a space is reserved.
As an improvement of the above technical solution, a first connection face formed at one side of the first piezoelectric ceramic sheet fixing bending plate is coated with epoxy, the first connection face is bonded by positioning and applying prestress, and the first piezoelectric ceramic sheet fixing bending plate is baked in an oven at 80 ℃ for more than 4 hours. The first cymbal is correspondingly fixed on a second connecting surface formed on the first piezoelectric ceramic plate, the second connecting surface is bonded by positioning and applying prestress, and the second cymbal is baked in an oven at 80 ℃ for more than 4 hours.
As an improvement of the above technical solution, the first piezoelectric ceramic pieces correspond to the first cymbals one by one, and the number of the first piezoelectric ceramic pieces is opposite to that of the first cymbals.
As one improvement of the above technical solution, the first piezoelectric ceramic piece is made of a functional ceramic material with piezoelectricity, i.e. a non-metallic material, such as a PZT material; the bending plate and the first cymbal are made of metal or nonmetal materials, and the shapes of the bending plate and the first cymbal are round or rectangular.
As one improvement of the technical scheme, a plurality of radial narrow slits are formed in the radial direction of the bending plate and the first cymbal.
As an improvement of the above technical solution, the hybrid broadband transducer further includes: the second piezoelectric ceramic plates and the second cymbals are arranged on the first piezoelectric ceramic plates; the second piezoelectric ceramic pieces are fixedly connected with the other side of the bending plate and are symmetrical with the first piezoelectric ceramic pieces; the second cymbal is fixedly connected below the second piezoelectric ceramic piece and is symmetrical to the first cymbal; the middle part of the second cymbal is not in direct contact with the second piezoelectric ceramic piece, and a space is reserved.
As an improvement of the above technical solution, the second piezoelectric ceramic pieces correspond to the second cymbals one by one, and the number of the second piezoelectric ceramic pieces is opposite to that of the second cymbals.
As one improvement of the above technical solution, the second piezoceramic sheet is made of a piezoelectric functional ceramic material, i.e. a non-metallic material, such as PZT material; the second cymbal is made of metal or nonmetal materials, and the shapes of the second cymbal and the second cymbal are both circular or rectangular; the second piezoelectric ceramic piece and the first piezoelectric ceramic piece are the same in shape, and the second cymbal and the first cymbal are the same in shape.
As an improvement of the above technical solution, the second cymbal is radially provided with a plurality of radial narrow slits.
As one improvement of the above technical scheme, a third connecting surface formed by fixing the other side of the bent plate by the second piezoelectric ceramic plate is coated with epoxy, is bonded by positioning and applying prestress, and is dried in an oven at 80 ℃ for more than 4 hours. The second cymbal is correspondingly fixed on a fourth connecting surface formed under the second piezoelectric ceramic piece, the fourth connecting surface is bonded by positioning and applying prestress, and the second cymbal is baked in an oven at 80 ℃ for more than 4 hours. The first piezoelectric ceramic piece, the second piezoelectric ceramic piece and the bending plate can be simultaneously coated with epoxy on the connecting surfaces, prestress is applied through positioning, and the materials are dried in an oven at 80 ℃ for more than 4 hours. On the basis, the bonding surfaces of the first piezoelectric ceramic piece, the second piezoelectric
As an improvement of the above technical solution, when the first cymbal, the second cymbal and the curved plate are made of metal, the first piezoelectric ceramic and the second piezoelectric ceramic are connected in parallel by connecting a positive electrode and a negative electrode, respectively, and the positive electrode and the negative electrode, which are input or output, are welded to the cymbal and the curved plate, respectively; and after welding, wholly or partially injecting polyurethane according to a double-sided working mode or a single-sided working mode, and drying for more than 4 hours in an oven at the temperature of 80 ℃.
When the first cymbal, the second cymbal and the bending plate are made of nonmetal materials, the first piezoelectric ceramic and the second piezoelectric ceramic are respectively connected in parallel by adopting a positive pole and a negative pole, and the positive pole and the negative pole which are used as input or output are directly led out from the positive pole and the negative pole of the piezoelectric ceramic. And after welding, wholly or partially injecting polyurethane according to a double-sided working mode or a single-sided working mode, and drying for more than 4 hours in an oven at the temperature of 80 ℃.
As an improvement of the above technical solution, the composite broadband transducer has two working modes: single-sided radiation and double-sided radiation; wherein the content of the first and second substances,
when the transducer adopts a single-side working mode, the composite broadband transducer is embedded in the rigid watertight shell; and a decoupling material, such as a vacuum rubber, is arranged on the contact surface of the two; a portion of the rigid watertight housing and the transducer are single-sided infused with polyurethane. The mixture is put into an oven at 80 ℃ to be dried for more than 4 hours.
When the transducer adopts a double-sided working mode, the whole transducer is filled with polyurethane or partially filled, so that the piezoelectric ceramic is watertight, and the positive electrode and the negative electrode are not in contact with working environment media at the same time.
The invention has the advantages that:
the transducer overcomes the defect of narrow bandwidth of the traditional transducer with two or three laminations or cymbals, and realizes wider working bandwidth by utilizing multiple modes of a composite structure, thereby effectively solving the corresponding problem caused by narrow working bandwidth; meanwhile, the dual-lamination dual-bending cymbal has the characteristics of low frequency, small size and light weight of dual-lamination, three-lamination bending and cymbal bending vibration.
Drawings
FIG. 1 is a cross-sectional view of a hybrid wideband transducer (i.e., a hybrid dual cymbal transducer) of the present invention;
FIG. 2 is a cross-sectional view of a composite wideband transducer (i.e., a composite cymbal transducer) in accordance with another embodiment of the present invention;
FIG. 3 is a cross-sectional view of a single-sided operation of the composite broadband transducer of the present invention with a rigid watertight housing embedded therein;
FIG. 4 is a schematic diagram of a transducer array comprising a plurality of composite broadband transducers according to the present invention;
FIG. 5 is a schematic diagram of a first cymbal with several slots in the first cymbal of a hybrid wideband transducer (i.e., a hybrid cymbal transducer) in accordance with another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a hybrid wideband transducer (i.e., a rectangular hybrid dual cymbal transducer) according to another embodiment of the present invention;
FIG. 6a is a schematic diagram of a composite wideband transducer (i.e., a rectangular composite dual cymbal open transducer) according to yet another embodiment of the present invention;
FIG. 7 is a schematic representation of the transmit response of a composite broadband transducer of the present invention;
FIG. 8 is a schematic diagram of a conventional three-piece transducer;
fig. 9 is a schematic structural diagram of a conventional cymbal transducer.
Reference numerals:
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9. Narrow slit
Detailed Description
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