Dipole antenna wireless strain sensor

Abstract

The invention provides a dipole antenna wireless strain sensor, and relates to the wireless strain sensor. According to the wireless strain sensor, the strain of a monitored structure is reflected by measuring the resonant frequency deviation of a dipole antenna. The wireless strain sensor is composed of a dipole layer (1), a dielectric substrate (2) and an earth plate (3). The dipole layer (1) and the earth plate (3) are attached to the upper surface and the lower surface of the dielectric substrate (2) respectively to constitute the dipole antenna. In the using process, the other face of the earth plate (3) is bonded to the monitored structure (4), the strain of the monitored structure (4) can cause the strain of the dipole antenna, and the strain of the dipole antenna can cause deviation of the resonant frequency of the dipole antenna. Accordingly, the strain condition of the surface of the monitored structure can be reflected through wireless monitoring of the variation of the resonant frequency of the dipole antenna.

Description

technical field [0001] The invention relates to a wireless strain sensor, in particular to a wireless strain sensor realized by dipole antenna technology. Background technique [0002] With the continuous improvement of the modern industrial level, the engineering structure becomes more and more complex, intelligent and diversified. How to ensure the safe and stable operation of the structure is the focus of concern from all walks of life. Under the fatigue load, the structure will produce small cracks in the stress concentration area. If the cracks are not found and repaired in time, as the cracks expand further, expensive structural repair costs will be incurred, and even the overall structure will be damaged in severe cases. huge catastrophic event. Therefore, if the strain of the structure can be monitored for a long time, such disasters can be effectively avoided. [0003] Currently applied monitoring technologies such as resistance strain gauges, optical fiber senso...

AI Technical Summary

Problems solved by technology

[0003] Currently used monitoring technologies such as resistance strain gauges, optical fiber sensors, and ultrasonic testing require a long cable to be placed on the surface of the structure and it is difficult to monitor for a long time

Therefore, it is difficult for these technologies to perform real-time strain monitoring on structures operating at high speeds such as aerospace vehicles, vehicles, and ships.

However, some wireless sensing technologies developed in recent years require equipment such as analog-to-digital signal converters, wireless transceivers, and batteries.

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