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.
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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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