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Metal surface crack monitoring based on RFID antenna sensor

A metal surface and sensor technology, applied in the direction of instruments, measuring devices, scientific instruments, etc.

Pending Publication Date: 2022-03-29
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Metal surface crack monitoring based on RFID antenna sensor
  • Metal surface crack monitoring based on RFID antenna sensor
  • Metal surface crack monitoring based on RFID antenna sensor

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1 Working principle of microstrip antenna sensor

[0020] When the tag sensor is placed on the surface of the metal structure to work, the metal structure to be tested becomes the new grounding plate of the tag, and its surface will form an induction surface current parallel to the polarization direction of the tag, and distribute it on the lower surface of the tag radiation patch and the metal structure on flat surface. In this paper, the direction of the label surface current is perpendicular to the surface crack and parallel to the length direction of the label sensor, such as figure 1 shown.

[0021] When surface cracks appear on the metal structure, the surface current passes through the concave part of the surface crack, and the surface current path length of the metal structure to be tested will increase with the increase of the surface crack depth. In addition, as the length of the surface crack increases, the proportion of the concave part passing ...

Embodiment 2

[0026] The structural composition of embodiment 2 microstrip antenna sensor

[0027] RFID-based label sensors are mainly composed of dielectric substrates, radiation patches and chips, such as image 3 shown. The radiation patch and the grounding plate are etched on the RF4 substrate with a relative permittivity of 4.4, and connected through a short-circuit pin; the label chip is Alien Higgs-3, and when the operating frequency is 915MHz, the input impedance Zchip=(27+j201)Ω , the right end of the chip is connected to the radiation patch, and the left end is connected to the transmission line. The specific dimensions of the label sensor are shown in Table 1. Compared with traditional fragile crack sensing tags, the sensor has the characteristics of realizing crack sensing without changing the physical structure of the tag, so the sensing tag can be reused, reducing the number of sensing units in the crack monitoring process. loss.

[0028] Table 1 Microstrip antenna sensor ...

Embodiment 3

[0035] Embodiment 3 Metal Surface Crack Monitoring Method Based on RFID Antenna Sensor

[0036] The main chemical composition of 5A06 aluminum alloy is selected as shown in Table 2. Its tensile strength is 315MPa and yield strength is 155MPa. The sample is processed according to GB / T228.1-2010 "Metal Tensile Test Method". At its center, a semi-elliptical surface defect is machined by EDM as a prefabricated crack. Sample size such as Figure 4 shown.

[0037] Table 2 Chemical composition of 5A06 aluminum alloy

[0038]

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Abstract

A metal surface crack monitoring method based on an RFID antenna sensor is characterized in that a micro-strip tag antenna is used as a crack sensor, a backscattering signal of the micro-strip tag antenna is used as a crack propagation characterization parameter, a load reduction hook line method is adopted to obtain the actual size of a surface crack in propagation, and the relationship between the size of the surface crack and the phase of the backscattering signal is established. The sensor can sense the crack propagation amount of 5.646 mm < 2 >, and theoretically can realize the monitoring sensitivity of 0.195 (degree) / mm < 2 >, thereby achieving the purpose of dynamic monitoring.

Description

technical field [0001] The invention relates to nondestructive detection technology, in particular to a metal surface crack monitoring method based on an RFID antenna sensor. Background technique [0002] Airplanes, bridges, rails and other large machinery will inevitably be affected by extreme loads or harsh environments during long-term service, resulting in cracks and structural failures, which may cause heavy casualties and economic losses. Therefore, it is of great significance to carry out structural monitoring and safety assessment on such structures and establish a safety early warning mechanism. So far, the assessment of structural health has mainly relied on non-destructive testing and assessment techniques, such as liquid penetrant testing, ultrasonic testing, eddy current testing, and thermal imaging testing. These evaluation methods can show good sensitivity and reliability in structural monitoring, but these equipment are expensive, complicated to operate, oft...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N3/02G01B7/02
CPCG01N3/32G01N3/02G01B7/02
Inventor 王海斗董丽虹黄艳斐徐雅薇黄东王朋谢向宇
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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