Prestressed stacked piezoelectric round tube transducer

Abstract

The invention provides a prestressed stacked piezoelectric round tube transducer. The prestressed stacked piezoelectric round tube transducer comprises a lining tube, a plurality of layers of stacked piezoelectric round tubes arranged outside the lining tube in a sleeved mode and a device for prestressing the multiple layers of stacked piezoelectric round tubes. According to the tranducer, the multiple stacked piezoelectric round tubes are stacked, vibration of a vibrator is superposition of radial vibration of the multiple round tubes, and thus the sensitivity of the transducer is improved. Because all the round tubes are unequal in radius and different in resonant frequency, a vibration system of the transducer has multiple vibration modes, and the working band of the transducer can be expanded. Because the structure of the cylindrical round tubes is adopted, the transducer can acquire horizontal all-directional beam directivity. Glass fiber is wound on the stacked piezoelectric round tubes, the bearing capacity of the piezoelectric transducer can be improved because the transducer is prestressed, and thus the reliability of the transducer is improved.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic detection, and in particular relates to a transducer for underwater detection that adopts multilayer piezoelectric ceramic circular tubes and prestressed stacks to realize the emission and reception of underwater acoustic signals. The transducer can be widely used in underwater communication, detection, target positioning, tracking, etc., and is an important part of sonar. Background technique [0002] The underwater acoustic transducer is a device that converts sound energy and electrical energy into each other. Its status is similar to the antenna in radio equipment, and it is a key device for transmitting and receiving sound waves underwater. Underwater detection, identification, communication, as well as marine environment monitoring and the development of marine resources are inseparable from underwater acoustic transducers. Transducers can be divided into transmitting type, rece...

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Problems solved by technology

[0017] In summary, the cylindrical tube structure can obtain horizontal and omnidirectional beam directivity, but since the transducer only vibrates through a single-layer piezoelectric ceramic shell to receive or radiate acoustic signals, obviously its vibration energy is far less than that generated by stacked chips Large, that is, the sensitivity is not as high as that of stacked wafer transducers

The composite rod piezoelectric transducer adopts multiple piezoelectric wafers to be stacked, and the stacked wafers generate greater vibration energy, which makes its emission sensitivity higher, but its radiation surface is a plane, resulting in a beam width of emission directionality ( opening angle) smaller

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