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Acoustic emission sensor as well as preparation method and application thereof

A technology of acoustic emission sensor and piezoelectric element, which is applied in the direction of material analysis using acoustic emission technology, which can solve problems affecting monitoring/detection accuracy, wrong evaluation of engineering quality, and susceptibility to corrosion, etc., to achieve good waterproof effect and shield the outside world Good effect of interference and compatibility

Inactive Publication Date: 2014-05-07
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercial acoustic emission probes are generally used in the health monitoring / testing of concrete structures (the structure of which is as follows Figure 9 As shown), most of them use piezoelectric ceramics as piezoelectric elements, with metal or plastic shells, which are often limited by factors such as poor compatibility between the probe and the concrete structure, susceptibility to corrosion, poor durability, etc., so that it can only be pasted externally structured surface for use
However, if the sensor is pasted on the surface of the structure for monitoring / detection, the thickness of the adhesive layer, changes in environmental conditions, and damage caused by human factors will directly affect the accuracy of monitoring / detection, resulting in a wrong assessment of the project quality.

Method used

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  • Acoustic emission sensor as well as preparation method and application thereof
  • Acoustic emission sensor as well as preparation method and application thereof
  • Acoustic emission sensor as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The manufacturing process of the present invention has four key parts: (1) Preparation of 1-3 type piezoelectric composite materials; (2) Welding shielding wire; (3) Preparation of backing layer; (4) Packaging process of sensors

[0042] (1) Preparation of type 1-3 piezoelectric composites

[0043] The 1-3 type piezoelectric composite materials were prepared by cutting-casting process, with PZT-5 piezoelectric ceramics as the piezoelectric phase, and the mixture of sulphoaluminate cement, AB-grouting resin, and curing agent as the matrix, among which piezoelectric ceramics The volume fraction is 68.9%. The specific steps are as follows:

[0044] (1) Take the piezoelectric ceramic block, first cut a series of grooves horizontally on it, and then cut a series of grooves vertically to form a series of ceramic columns with a cross-sectional area of ​​4mm 2 , with a height of 12mm;

[0045] (2) After cutting, clean the cut ceramic block repeatedly to remove the residu...

Embodiment 2

[0086] 1. Prepare Type 1-3 cement / polymer-based piezoelectric composite materials according to the method of Example 1;

[0087] 2、 Weld the shielding wire on the piezoelectric composite material and fix it on the bottom of the mold so that the negative side of the piezoelectric element is in contact with the mold;

[0088] 3, prepare backing layer according to the method for embodiment 1;

[0089] 4. Prepare the encapsulation layer according to the method in Example 1, except that the mass ratio of cement, epoxy resin and graphite is 7:7:1, and the mass ratio of curing agent to epoxy resin is 4:1.

[0090] Performance tests were performed on the obtained sensor, and its bandwidth, threshold, sensitivity, and response to cracks in concrete materials were similar to those of the sensor in Example 1.

Embodiment 3

[0092] The acoustic emission sensor was prepared according to the method of Example 1, the difference was that when preparing the encapsulation layer, the mass ratio of cement, epoxy resin and graphite was 7:7:6, and the mass ratio of curing agent to epoxy resin was 4: 1.

[0093] Performance tests were performed on the obtained sensor, and its bandwidth, threshold, sensitivity, and response to cracks in concrete materials were similar to those of the sensor in Example 1.

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Abstract

The invention discloses an acoustic emission sensor comprising a piezoelectric element, a back-lining layer and a packaging layer for shielding external interference, wherein the piezoelectric element and the back-lining layer are arranged in the packaging layer; the upper surface of the piezoelectric element is used as a positive pole, and the lower surface of the piezoelectric element is used as a negative pole and directly connected with the packaging layer; other surfaces of the piezoelectric element are connected with the back-lining layer; and the back-lining layer is directly connected with the packaging layer. The invention also discloses a preparation method and application of the sensor. The sensor disclosed by the invention is good in compatibility with a concrete structure, good in an anti-interference effect, high in sensitivity, wide in response band, simple in manufacturing process, reasonable in structure, low in price, convenient to use and suitable for being buried into the concrete structure so as to have important significance for the research and the development of the application of an acoustic emission technique to the health monitoring / detecting of a civil engineering structure.

Description

technical field [0001] The invention relates to an acoustic emission sensor and its preparation method and application, in particular to an acoustic emission sensor with strong anti-interference ability, high sensitivity and good compatibility with concrete structures, which uses piezoelectric composite materials as components and its preparation method And its application in concrete structure health monitoring / testing. Background technique [0002] As a dynamic non-destructive monitoring / detection technology, acoustic emission has been widely used in the health detection of concrete structures. Acoustic emission is a common physical phenomenon. If the released strain energy is large enough, an audible sound will be produced. Most materials will have acoustic emission when they are plastically deformed and fractured, but the release of internal stress in the material produces The acoustic emission signal is very weak, and its frequency range is in the ultrasonic frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/14
Inventor 黄世峰徐东宇叶正茂芦令超李蜜蜜程新
Owner UNIV OF JINAN