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Orthotropic piezoelectric sensor for monitoring/detection of civil engineering structure, preparation method thereof and application thereof

A piezoelectric sensor, orthotropic technology, applied in material selection for piezoelectric or electrostrictive devices, fabrication/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive It can solve the problem of lack of measuring stress and stress wave, and achieve obvious orthotropic characteristics, high sensitivity, and shielding effects from external interference.

Active Publication Date: 2014-05-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the smart materials used in the field of civil engineering generally do not have the ability to measure stress and stress waves in a specific direction, the present invention provides an orthotropic piezoelectric sensor, which has obvious orthotropic characteristics and is compatible with concrete Good compatibility, strong anti-interference ability, high sensitivity, wide response frequency and other characteristics, used for monitoring or detection of civil engineering structures

Method used

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  • Orthotropic piezoelectric sensor for monitoring/detection of civil engineering structure, preparation method thereof and application thereof
  • Orthotropic piezoelectric sensor for monitoring/detection of civil engineering structure, preparation method thereof and application thereof
  • Orthotropic piezoelectric sensor for monitoring/detection of civil engineering structure, preparation method thereof and application thereof

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Embodiment 1

[0031] The manufacturing process of the present invention is divided into the following parts: (1) preparation of 1-3 type orthotropic piezoelectric composite materials; (2) preparation of matching layer; (3) preparation of backing layer (also called package); (4) shielding treatment.

[0032] (1) Preparation of type 1-3 orthotropic piezoelectric composites

[0033] Prepare 1-3 type orthotropic polymer / cement-based piezoelectric composites or 1-3 type orthotropic cement-based piezoelectric composites by combining cutting-casting and alignment-casting methods, with PZT-5 piezoelectric Ceramic is the piezoelectric phase, a mixture of epoxy resin (AB-grouting resin) and cement (sulfoaluminate cement) or cement (sulfoaluminate cement) as a matrix, using conductive glue to form interdigitates inside the piezoelectric composite type electrodes, forming an interdigitated structure. The structural parameters and component parameters of the obtained piezoelectric composite material a...

Embodiment 2

[0069] 1. Preparation of Type 1-3 orthotropic polymer / cement-based piezoelectric composite material according to the method of Example 1;

[0070] 2、 Connecting the orthotropic piezoelectric element to the wire, the positive and negative poles of the piezoelectric element are respectively connected to the wire, and a part of the wire is drawn from the wire connected to the negative electrode of the orthotropic piezoelectric element as a shielding wire;

[0071] 3. Prepare the matching layer according to the method in Example 1, except that the mass ratio of cement, epoxy resin and tungsten powder is 3:3:1, and the mass ratio of curing agent to epoxy resin is 4:1;

[0072] 4. Prepare a backing layer according to the method of Example 1.

[0073] 5. Prepare the shielding layer according to the method in Example 1.

[0074] Performance tests were performed on the obtained sensor, and its orthotropic characteristics, sensitivity, bandwidth and other performances were similar to ...

Embodiment 3

[0076] Orthotropic piezoelectric sensors are prepared according to the method of Example 1, the difference is that when preparing the matching layer, the mass ratio of cement, epoxy resin and tungsten powder is 1:1:3, and the mass ratio of curing agent to epoxy resin The ratio is 4:1.

[0077] Performance tests were performed on the obtained sensor, and its orthotropic characteristics, sensitivity, bandwidth and other performances were similar to those of the sensor in Example 1.

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Abstract

The invention discloses an orthotropic piezoelectric sensor for monitoring / detection of a civil engineering structure. The orthotropic piezoelectric sensor for monitoring / detection of the civil engineering structure comprises an orthotropic piezoelectric composite material component, a matching layer, a back-lining layer and a wire, wherein the lower surface of the orthotropic piezoelectric composite material component is connected with the matching layer, other surfaces of the orthotropic piezoelectric composite material component are connected with the back-lining layer, the surface of the matching layer and the surface of the back-lining layer are respectively provided with a shielding layer in a coating mode, and the wire is respectively connected with a positive electrode and a negative electrode of the orthotropic piezoelectric composite material component. The invention further discloses a preparation method of the orthotropic piezoelectric sensor for monitoring / detection of the civil engineering structure, and application of the orthotropic piezoelectric sensor for monitoring / detection of the civil engineering structure. The orthotropic piezoelectric sensor for monitoring / detection of the civil engineering structure has the advantages of being obvious in orthotropic characteristic, good in sensitivity, wide in response frequency band, good in disturbance-resisting capacity, capable of having different response characteristics aiming at different directions, and capable of effectively restraining reception of sidewise interference signals, and improving a signal-to-noise ratio.

Description

technical field [0001] The invention relates to an orthotropic piezoelectric sensor with orthotropic characteristics, high sensitivity and wide frequency band, and its preparation method and application, in particular to an orthotropic piezoelectric sensor suitable for civil engineering structure health monitoring and Its preparation method and application. Background technique [0002] At present, in the field of civil engineering construction, the use of smart materials to implement health monitoring, testing and forecasting of some major civil engineering buildings is becoming more and more extensive. However, smart materials used in the field of civil engineering, such as memory alloys, strain gauges, carbon fibers, piezoelectric ceramics, etc., generally do not have the ability to measure stress and stress waves in specific directions, cannot distinguish damage signals in different directions, and cannot analyze the damage of concrete structures. The source of damage i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/18H01L41/113H01L41/37H01L41/27H10N30/85H10N30/05H10N30/092H10N30/30
Inventor 程新黄世峰徐东宇叶正茂芦令超谢士会
Owner UNIV OF JINAN
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