Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor

A strain sensor and testing method technology, applied in the measurement of the property force of the piezoelectric resistance material, the calibration/testing of the force/torque/power measuring instrument, instruments, etc., to achieve stable performance, good mechanical compatibility, and electromagnetic resistance strong interference effect

Active Publication Date: 2014-02-05
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the use of piezoelectric sensors to reflect the strain state of concrete.

Method used

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  • Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor
  • Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor
  • Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor

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Embodiment 1

[0047] Piezoelectric strain sensor of the present invention such as figure 1 As shown, the PZT piezoelectric ceramic sheet (thickness 1mm) is used as the piezoelectric sensing element. The upper surface of the piezoelectric ceramic sheet is the positive electrode, and the lower surface is the negative electrode. The positive and negative electrodes are connected with shielding wires, and there is a layer of A 0.5mm thick silicone layer, with an encapsulation layer attached to the piezoelectric ceramic sheet and the silicone layer. As the outermost layer of the sensor, the packaging layer isolates the piezoelectric ceramic sheet from the outside world. The silica gel layer and the piezoelectric ceramic sheet are in direct contact with the packaging layer, so that the piezoelectric ceramic sheet is evenly stressed. In addition, the shielding wire is drawn from the negative electrode of the piezoelectric ceramic sheet, the end of the shielding wire is pasted on the outer surface...

Embodiment 2

[0051] Prepare according to the method for embodiment 1 figure 1 The structure of the sensor, the difference is: the encapsulation layer material is a mixture of sulfoaluminate cement, AB-grouting resin, curing agent and graphite with a mass ratio of 4:4:1:2; the thickness of the encapsulation layer is 1.5mm.

Embodiment 3

[0053] Prepare according to the method for embodiment 1 figure 1 The structure of the sensor, the difference is: the material of the encapsulation layer is a mixture of sulfoaluminate cement, AB-grouting resin, curing agent and graphite with a mass ratio of 4:4:1:3; the thickness of the encapsulation layer is 1.5mm.

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Abstract

The invention discloses a piezoelectric strain sensor, a method for testing the strain sensitivity of the piezoelectric strain sensor and the application of the piezoelectric strain sensor. The sensor comprises a piezoelectric ceramic piece, a silica gel layer and a packaging layer, wherein the silica gel layer makes the sensor stressed evenly and good in sensitivity, and the packaging layer makes the sensor good in insulating property and resistant to interference of the external environment. According to the method, strain sensitivity testing is carried out through a constant-strength beam device, the strain sensitivity (mV/mu epsilon) of the sensor under the condition of different low vibration frequencies of a bridge can be tested, and the strain of a bridge structure can be indirectly reflected according to the strain sensitivity under different vibration frequencies and the voltage output of the sensor; in this way, the piezoelectric strain sensor can replace a strain gage to measure the strain of structures like the bridge under low frequencies, various shortcomings caused by using the strain gage are overcome, and the sensor has broad application prospects in bridge monitoring.

Description

technical field [0001] The invention relates to a piezoelectric strain sensor, in particular to a piezoelectric strain sensor based on a piezoelectric ceramic sheet used in concrete structure strain monitoring, a method for testing the sensitivity of the sensor and its application. Background technique [0002] In civil engineering structures, the most direct and effective health monitoring method is to measure the changes in the internal force and strain of the concrete structure, that is, to judge the local health status of the structure through the stress and strain state of the concrete. Nowadays, strain gauges are generally used for strain monitoring of concrete structures, and the strain gauges are attached to bridges to reflect the health status of concrete structures by collecting their strain signals. However, the strain gauge has many disadvantages, for example: 1. The zero point drift of the strain gauge is severe, and regular calibration is required; 2. The strai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L25/00G01L1/18
Inventor 程新沙飞徐东宇黄世峰芦令超
Owner UNIV OF JINAN
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