Damage identifying piezoelectric sensor capable of repeated use

A technology of piezoelectric sensing and piezoelectric ceramic sheet, which is applied in the field of sensors, can solve the problems of damage identification result error, electrical signal difference, and natural vibration frequency difference, and achieve convenient processing, high practicability, and enhanced impact resistance Effect

Pending Publication Date: 2019-11-05
NINGBO UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a piezoelectric crystal, piezoelectric ceramics have different parameters such as piezoelectric constants and dielectric constants, and the natural vibration frequency is even different, resulting in large differences in the electrical signals fed back by different piezoelectric ceramics, which will It brings a lot of error to the damage identification result

Method used

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  • Damage identifying piezoelectric sensor capable of repeated use
  • Damage identifying piezoelectric sensor capable of repeated use
  • Damage identifying piezoelectric sensor capable of repeated use

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] 1. Specific examples

[0022] A reusable piezoelectric sensing device for identifying damage such as figure 1 , figure 2 , image 3 and Figure 4 As shown, it includes a piezoelectric ceramic sheet 1, and also includes a metal box body 3 for bonding with the surface of the measured component 2. The center of the top plate of the metal box body 3 is provided with a wire passing hole 4, and one side of the metal box body 3 The side wall extends vertically upwards to form a knocking surface 5 for knocking off the metal box body 3 and the component under test 2. The piezoelectric ceramic sheet 1 is located in the metal box body 3 and is tightly pasted and fixed on the bottom plate of the metal box body 3. The wire 6 of the electroceramic sheet 1 passes through the wire exit hole 4 and is connected to an external impedance analyzer (not...

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Abstract

The invention discloses a damage identifying piezoelectric sensor capable of repeated use. The sensor comprises a piezoelectric ceramic plate, and is characterized by comprising a metal box bonded tothe surface of a detected member, a lead through hole is arranged in the center of the top plate of the metal box, one sidewall of the metal box extends vertically upwards to form a knocking surface to dismount the metal box from the detected member by knocking, the piezoelectric ceramic plate is positioned in the metal box and tightly pasted and fixed onto the base plate of the metal box, and a lead of the piezoelectric ceramic plate penetrates the lead through hole and is connected with an external impedance analyzer. The piezoelectric sensor is simple in manufacture and convenient to operate, and can effectively eliminate a test error caused by difference of the piezoelectric ceramic plate itself.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a reusable piezoelectric sensor device for damage recognition. Background technique [0002] Piezoelectric element is a device with electromechanical conversion characteristics and dual functions of driving and sensing. In recent years, researchers have been particularly active in the development of piezoelectric elements as sensing devices. There are piezoelectric ceramic sensors based on 3D printing automation packaging, tensile piezoelectric sensors for logistics monitoring, a high-sensitivity piezoelectric EMES sensor, and piezoelectric acceleration sensors. [0003] Lead zirconate titanate piezoelectric ceramics (PZT) are commonly used as piezoelectric layer materials for piezoelectric elements. Based on its own piezoelectric effect and dielectric properties, it has great room for development as a sensing element in the fields of mechanical and civil engineering. Piezoele...

Claims

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Application Information

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IPC IPC(8): G01N27/20G01N27/04
CPCG01N27/20G01N27/041G01M5/0033G01M5/0066H10N30/88H10N30/302Y02W30/80G01L1/16H10N30/853
Inventor 李俊华何思聪
Owner NINGBO UNIV
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