Sensing/exciting device based on piezoelectric composite material and preparation method thereof

Abstract

The invention discloses a sensor / exciter based on a piezoelectric composite material and a preparation method thereof, and relates to the technical field of functional devices and preparation thereof. The sensor / exciter based on the piezoelectric composite material comprises the piezoelectric composite material, a positive and negative electrode assembly, an upper surface protection film and a lower surface protection film, wherein the piezoelectric composite material comprises array micro piezoelectric units, positive and negative conductive fibers, bonding fibers and a reinforcing frame. After packaging is completed, positive and negative rectangular bonding pads are connected for polarization, and an efficient functional device which can be used as a sensor and an exciter is formed. According to the functional device, the phenomenon that an electric field in a traditional piezoelectric composite material is not uniform is avoided, the problem that materials of all phases fall off in the manufacturing process of the piezoelectric composite material is solved, and meanwhile it is guaranteed that a bus circuit is electrically connected with the conductive fibers. According to the preparation method of the sensor / exciter based on the piezoelectric composite material, the structure size and the device performance are accurately controlled, and serialization and batch production of devices can be realized.

Description

technical field [0001] The invention relates to the technical field of a functional device and its preparation, in particular to a sensor / exciter based on piezoelectric composite materials and a preparation method thereof. Background technique [0002] As a special functional material, piezoelectric ceramics can sense the external stress field through the positive piezoelectric effect, and can also release stress waves through the inverse piezoelectric effect. Because ordinary piezoelectric materials are hard and brittle, they cannot be applied to curved structures. Some scholars and researchers at home and abroad have miniaturized piezoelectric materials and used flexible materials as skeletons to make piezoelectric composite materials suitable for curved structures. Piezoelectric composite materials can be named according to the connection mode of each phase material. Two-phase piezoelectric composite materials have 10 kinds of connectivity, while three-phase piezoelectric...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a sensor / actuator based on piezoelectric composite materials, aiming to improve the problem of uneven electric field in existing piezoelectric composite materials using the d33 characteristic structure, and at the same time solve the function of the sensor / actuator The material, that is, the piezoelectric composite material, has the problem of material shedding in each phase during the grinding process, so as to improve the yield of the finished product, and optimize the piezoelectric ceramic functional material with high d33 and g33 values, and finally make the device a dual-purpose sensor and excitation device.

[0005] Another object of the present invention is to provide a method for preparing a sensor / actuator based on piezoelectric composite materials, which uses the method of filling conductive fibers in the middle to solve the problem of uneven electric field in the micro-piezoelectric unit of the array, and the method of adding a frame around the periphery to solve the problem of grinding. The problem of material falling off in each phase, the method of etching and sputtering circuit on the reinforced frame solves the problem of electrical conduction between the bus circuit and the conductive fiber

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