Metal structure health detection method based on UHF passive RFID

A metal structure and health detection technology, which is applied in the direction of cooperative devices, special data processing applications, instruments, etc., can solve problems such as inability to detect metal features, and achieve comprehensive effects

CN110598815AActive Publication Date: 2019-12-20SOUTHWEAT UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-12-20

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Abstract

The invention provides a metal structure health detection method based on UHF passive RFID. The metal structure health detection method comprises: constructing a 3D model bending patch dipole sensinglabel; determining the relationship between the defects on the surface of the metal structure and the internal characteristic change of the sensing label; acquiring amplitude and phase characteristicsbetween the sensing tag and an RFID reader according to the relationship; and training the defects on the surface of the metal structure according to the amplitude and phase characteristics, and extracting the characteristics of the corresponding defects to draw a characteristic curve function, thereby completing the detection of the metal structure based on the UHF passive RFID. By means of thedesign, the problem that a traditional label cannot conduct feature detection on metal is solved. The method is flexible and has very high popularization and application values.
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Description

technical field

[0001] The invention belongs to the field of structural health monitoring of practical machinery and civil infrastructure construction, and in particular relates to a metal structure health detection method based on UHF passive RFID. Background technique

[0002] At present, a large number of metal materials are used at home and abroad to design and manufacture racks, bridges and building loads, landmark buildings and entertainment facilities, etc. Metal is everywhere in people's lives. For metals that have been bearing huge pressure and exposed to the external environment all the year round, the metal structure cannot be slightly wrong. Due to the long-term bearing pressure of the metal and environmental weathering, erosion, unknown factors caused by fatigue or corrosion on the metal structure may induce dangerous accidents , endangering the life safety of the public and the safety of social property. Therefore, for SHM, it is indispensable to detect the hea...

Examples

Embodiment

[0047] Such as figure 1 As shown, the present invention provides a metal structure health detection method based on UHF passive RFID, and its specific implementation block diagram is as follows figure 2 shown. According to the present invention, defects (cracks) appear on the metal surface in the exposed environment or under huge pressure, which indirectly causes the impedance of the antenna arm to change. According to this characteristic change, the RFID technology can be used to realize real-time detection of the health of the metal structure. The specific implementation steps are as follows:

[0048] S1. Build a 3D model to bend the patch dipole sensor tag, such as image 3 As shown, the sensing tag in step S1 includes a 16mm thick FR4 substrate, an antenna arm attached to the surface of the FR4 substrate, and a radio frequency chip connected to the antenna arm.

[0049] In this embodiment, for the design of the 3D model miniaturized bent patch dipole sensor tag in step...